CN104868219B - Adjustable radio frequency coupler and manufacturing method thereof - Google Patents

Abstract

The present invention provides an adjustable radio frequency coupler and a manufacturing method thereof. The adjustable radio frequency coupler comprises an insulating layer, a first transmission line, and a second transmission line. The second transmission line is arranged corresponding to the first transmission line, and the insulating layer is arranged between the first transmission line and the second transmission line. The second transmission line comprises a plurality of line segments, which are separated from each other and arranged along the extension path of the first transmission line, wherein at least one wire is used to electrically connect at least two line segments so that the at least two line segments are electrically conductive via at least one wire. The present invention can reduce the number of scrapped adjustable radio frequency couplers.

Description

Adjustable radio frequency coupler and method of making the same

technical field

The present invention provides a radio frequency (radio frequency, RF) coupler (coupler), and particularly relates to an adjustable radio frequency coupler and a manufacturing method of the adjustable radio frequency coupler.

Background technique

Due to the popularization of wireless communication products in recent years, the people's life has become more convenient and digitalized, and the market demand and manufacturing technology have been improving day by day, causing the design specifications of many circuits to change accordingly. Especially in the field of wireless communication, the design of receiving and transmitting end circuits has a great influence.

In the design of a radio frequency front end module, a radio frequency coupler is usually designed for the back end circuit (for example, a power detector). In the design of the RF coupler, the circuit designer will do a proper simulation for its frequency band and coupling amount before proceeding with the circuit layout. Then, after the manufacture is completed by the manufacturer, the circuit designer will perform measurements on the RF coupler to check the characteristics of the manufactured RF coupler. However, when it is found that the characteristics of the finished RF coupler are not good, for example, when the coupling amount or directivity is insufficient, the circuit designer may need to redesign the circuit layout of the RF coupler and place the RF coupler with poor characteristics The coupler is scrapped, resulting in a waste of resources.

Contents of the invention

The invention provides an adjustable radio frequency coupler comprising an insulating layer, a first transmission line and a second transmission line. The second transmission line is arranged corresponding to the first transmission line, and the insulating layer is arranged between the first transmission line and the second transmission line. The second transmission line includes a plurality of line segments separated from each other and arranged along the extension path of the first transmission line, wherein at least one wire is used to electrically connect at least two line segments, so that the at least two line segments are electrically conductive via at least one wire Pass.

An embodiment of the present invention provides a method for manufacturing an adjustable radio frequency coupler, including forming a first transmission line on a first surface of an insulating layer. A second transmission line composed of a plurality of line segments is formed on the second surface opposite to the first surface, wherein the line segments are separated from each other and arranged corresponding to the first transmission line. At least one wire is arranged to electrically connect the at least two wire segments, so that the at least two wire segment pairs are electrically connected through the at least one wire.

To sum up, the adjustable radio frequency coupler provided by the embodiment of the present invention adjusts the effective transmission line length of the second transmission line according to the electrical connection between at least one wire and multiple line segments, and then changes the length of the second transmission line and the first transmission line. The length of overlap between one transmission line to adjust the amount of coupling between the second transmission line and the first transmission line. Accordingly, the above-mentioned adjustable radio frequency coupler can support all frequency bands of the third generation mobile communication technology (3G), so as to achieve the effect of wide frequency band and high directivity.

In addition, when the characteristics of the finished radio frequency coupler are not good, it is not necessary to re-change the circuit layout of the adjustable radio frequency coupler, but only need to adjust the connection method or connection position of at least one wire and multiple line segments, thereby changing the effective transmission line The length of the adjustable RF coupler is used to design the characteristics of the coupling amount of the frequency band (for example: high frequency band or low frequency band) that the adjustable RF coupler needs to support, and to reduce the number of scrapped adjustable RF couplers to reduce the waste of resources.

In order to further understand the technology, method and effect that the present invention adopts to achieve the intended purpose, please refer to the following detailed description and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention can be deeply and concretely However, the accompanying drawings and appendices are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

Fig. 1 is a circuit wiring diagram of an adjustable radio frequency coupler provided by an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the state viewed from line A-A in the direction of the arrow in Fig. 1 .

FIG. 3 is a simulation diagram illustrating the tunable RF coupler of FIG. 1 .

Fig. 4 is a circuit wiring diagram of another adjustable radio frequency coupler provided by an embodiment of the present invention.

FIG. 5 is a simulation diagram illustrating another adjustable RF coupler shown in FIG. 4 .

Fig. 6 is a circuit wiring diagram of another adjustable radio frequency coupler provided by an embodiment of the present invention.

FIG. 7 is a simulation diagram illustrating another adjustable RF coupler shown in FIG. 6 .

Fig. 8 is a flowchart of a manufacturing method of an adjustable radio frequency coupler provided by an embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1, 4, 6: adjustable RF coupler

10, 10': insulating layer

11: wire

12: The first transmission line

13, 43, 63: Second transmission line

14: Inductance

15, 15': wire bonding pad

16: RF input terminal

17: Coupling end

18: RF output terminal

19: Isolation end

110: first surface

120: second surface

131a～131g, 431a～431g, 631a～631g: line segment

C300, C310, C500, C510, C700, C710: Curves

S810～S860: steps

detailed description

Various exemplary embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like numbers indicate like elements throughout.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the inventive concept. As used herein, the term "or" may include any one or all combinations of more of the associated listed items, depending on the actual situation.

[Example of Adjustable RF Coupler]

First, please refer to Figure 1 and Figure 2. Figure 1 is a circuit wiring diagram of an adjustable radio frequency coupler provided by an embodiment of the present invention, and Figure 2 is a cross-sectional view of the state viewed from line A-A in the direction of the arrow in Figure 1 . The adjustable radio frequency coupler 1 has a radio frequency input terminal 16, a radio frequency output terminal 18, a coupling terminal 17 and an isolation terminal 19, wherein the adjustable radio frequency coupler 1 includes an insulating layer 10, a first transmission line 12, a second transmission line 13 and at least one wire 11, wherein the insulating layer 10 is disposed between the first transmission line 12 and the second transmission line 13. The second transmission line 13 is arranged corresponding to the first transmission line 12 , for example, the second transmission line 13 is arranged directly above the first transmission line 12 , and both ends of the second transmission line 13 are respectively connected to the RF input terminal 16 and the RF output terminal 18 . However, in other embodiments, the positions of the second transmission line 13 and the first transmission line 12 can be interchanged, so the present invention is not limited thereto. As shown in FIG. 1 , the second transmission line 13 is composed of seven line segments 131 a - 131 g , and these line segments 131 a - 131 g are separated from each other and aligned with the extending path of the first transmission line 12 .

Each line segment 131a-131g has two ends, wherein one end point of the line segment 131a is electrically connected to the radio frequency input terminal 16, and one end point of the line segment 131g is electrically connected to the radio frequency output end 18, when the wire 11 is electrically connected to the line segment 131a and the line segment respectively The other two ends of 131g can make the RF input terminal 16 and the RF output terminal 18 electrically connected through the wire 11, so that the two line segments 131a, 131g form an effective transmission line of the second transmission line 13 and couple with the first transmission line 12.

In this embodiment, the wire 11 is a bonded wire formed by wire-bonding, and its material is gold, but in other embodiments, its material can also be aluminum, tin or a mixture thereof material, and the wire 11 can also be tin wire for soldering.

In addition, the tunable RF coupler 1 may further include a plurality of bonding pads 15 (finger pads). One end of the first line segment 131 a is connected to the radio frequency input terminal 16 , and the other end is connected to the bonding pad 15 . One end of another line segment 131g is connected to the radio frequency output terminal 18 , and the other end is connected to the bonding pad 15 . Utilizing the connection between the wire 11 and the bonding pad 15 , the wire segment 131 a is electrically connected to the wire segment 131 g through the wire 11 .

Similarly, since the line segments 131a-131g of the second transmission line 13 are separated from each other and aligned with the extending path of the first transmission line 12, after electrically connecting the different line segments 131a-131g through at least one wire 11, they can be electrically conductive to each other. The connected line segments 131a-131g are combined into various effective transmission lines of different lengths. By selecting the most suitable length, the purpose of adjusting the coupling amount between the second transmission line 13 and the first transmission line 12 is achieved, wherein the effective transmission line and the first transmission line 12 The overlapping length between is directly related to the coupling amount between the second transmission line 13 and the first transmission line 12 .

In addition, the effective transmission line can also connect the first line segment 131 a , the second line segment 131 b , the sixth line segment 131 f and the seventh line segment 131 g through a plurality of wires 11 . In a word, through different electrical connections between the conductive wire 11 and the multiple line segments 131a-131g of the second transmission line 13, the coupling amount between the second transmission line 13 and the first transmission line 12 can be adjusted, and the adjustable radio frequency coupler can be changed. 1 Supportable broadband (broadband).

In this embodiment, the present invention does not limit the length of the effective transmission line, and in other embodiments, those skilled in the art can design according to actual usage conditions.

Incidentally, in this embodiment, in order to increase the directivity of the adjustable RF coupler 1, an inductor 14 is provided between the first transmission line 12 and the isolation end 19 to increase the impedance and further To increase the directivity of the adjustable RF coupler 1, wherein, in this embodiment, the inductance 14 is a discrete inductive element (lumpedelement), however, in other embodiments, those skilled in the art can carry out according to the actual use Design, for example, the inductor 14 can be designed as an embedded inductor, so the present invention is not limited thereto.

It is worth mentioning that, as shown in FIG. 2, the first transmission line 12 and the second transmission line 13 are respectively disposed on opposite surfaces of the insulating layer 10 (for example, the first surface 110 and the second surface 120), that is, The first transmission line 12 can be arranged on another insulating layer 10' and sandwiched between the insulating layer 10 and the insulating layer 10'. In short, the first transmission line 12, the second transmission line 13 and the insulating layer 10 can be one Part of a multilayer circuit board. Therefore, the tunable RF coupler 1 can be constructed in a multi-layer circuit board.

Next, in this embodiment, seven line segments 131a-131g are used as an example for illustration. However, in other embodiments, there may be more than seven line segments 131a-131g or less than seven line segments 131a-131g. The skilled person can design according to the actual use situation, so the present invention is not limited thereto.

Furthermore, in this embodiment, the lengths of the first line segment 131a to the seventh line segment 131g are not consistent, however, in other embodiments, the first line segment 131a to the seventh line segment 131g may also have the same length.

In addition, in this embodiment, the seven line segments 131a-131g are not all straight line segments, and may also be curved line segments (such as: the fourth line segment 131d and the seventh line segment 131g). However, in other embodiments, they are not Without limitation, the multiple line segments may be straight line segments or curved line segments, and those skilled in the art can design according to actual usage conditions, so the present invention is not limited thereto.

Next, the following will describe in detail how the tunable RF coupler 1 of this embodiment can support the high frequency band and the low frequency band of 3G.

In detail, please refer to FIG. 3 and FIG. 1 at the same time. FIG. 3 is a simulation diagram illustrating the adjustable RF coupler in FIG. 1 . In FIG. 3 , the vertical axis represents intensity in decibel (dB), and the horizontal axis represents frequency in gigahertz (GHz). Curves C300 and C310 represent the coupling amount and isolation of the adjustable RF coupler 1 . As shown in Figure 3 and Figure 1, when the adjustable RF coupler 1 is used to support the high frequency band of 3G 1.71-1.98 GHz, by changing the length of the effective transmission line of the second transmission line 13, a shorter effective transmission line can be formed , so that the adjustable radio frequency coupler 1 can achieve the characteristic of supporting 3G high frequency band 1.71-1.98 GHz.

It can be seen that, as shown in FIG. 1, a shorter effective transmission line can be formed by electrically connecting the first line segment 131a and the seventh line segment 131g through a wire 11, wherein the length of the effective transmission line is 1510um, and the thickness and The widths are 15um and 50um respectively.

Therefore, the effective transmission line formed by the first line segment 131 a and the seventh line segment 131 g overlaps less with the first transmission line 12 . Accordingly, it can be seen from Figure 3 that when the adjustable RF coupler 1 is designed to support the 3G high frequency band 1.71-1.98GHz, the coupling amount range of the designed adjustable RF coupler 1 (m1～m2) is -22.9～-23.9dB and the isolation range (m3～m4) is the characteristic of -64.6～-71.7dB.

On the other hand, please refer to FIG. 4 and FIG. 5 together. FIG. 4 is a circuit layout diagram of another adjustable radio frequency coupler provided by an embodiment of the present invention. FIG. 5 is a simulation diagram illustrating another tunable RF coupler shown in FIG. 4 . As shown in FIG. 4 , the structure of the adjustable RF coupler 4 in FIG. 4 is similar to that of the adjustable RF coupler 1 in FIG. 1 , and the same components included in the two will be denoted by the same reference numerals below. The difference between the adjustable radio frequency coupler 4 and 1 is: the length of the effective transmission line formed by the second transmission line 43, wherein this length refers to the path length of the effective transmission line, and the design method of the adjustable radio frequency coupler 4 of Fig. 4 Can be used to support 3G low frequency band 824MHz ~ 915MHz.

In detail, in FIG. 5 , the vertical axis represents intensity in decibel (dB), and the horizontal axis represents frequency in gigahertz (GHz). Curves C500 and C510 represent the coupling amount and isolation of the adjustable RF coupler 4 . When the adjustable radio frequency coupler 4 is used to support the 3G low frequency band of 824-915MHz, the length of the second transmission line 43 can be changed to form a longer effective transmission line, so that the adjustable radio frequency coupler 4 can support the 3G low frequency band 824 ~ 915MHz characteristics.

Specifically, since the effective transmission line required for the low-frequency band 824-915MHz overlaps the first transmission line 12 for a long length, when the adjustable radio-frequency coupler 4 is used to support the adjustable radio-frequency coupler 4 for the 3G low-frequency band 824-915MHz In the case of the coupler 4, since the effective transmission line required by the low-frequency band and the first transmission line 42 need to overlap more lengths, all adjacent line segments 431a-431g are electrically connected through the wire 11 to satisfy Adjustable RF coupler 4 is required for low frequency band 824-915MHz.

In more detail, the first line segment 431a is electrically connected to the second line segment 431b, the second line segment 431b is electrically connected to the third line segment 431c, and the third line segment 431c is electrically connected to the third line segment 431c through the wire 11. Four line segments 431d, electrically connecting the fourth line segment 431d and the fifth line segment 431e, electrically connecting the fifth line segment 431e and the sixth line segment 431f, and electrically connecting the sixth line segment 431f and the seventh line segment 431g, will be able to form the above-mentioned effective transmission line that meets the requirements of the low frequency band 824-915MHz. Accordingly, the formed effective transmission line has a length of 4100 um, a thickness and a width of 15 um and 50 um, respectively.

It can be seen that the effective transmission line is composed of the first line segment 431a to the seventh line segment 431g, so that when the adjustable radio frequency coupler 4 is used to support the 3G low frequency band 824-915MHz, the coupling amount of the adjustable radio frequency coupler 4 The range (m1～m2) can reach -19.7～-20.6dB, and the isolation range (m3～m4) is -47.7～47.9dB.

Next, please refer to FIG. 6 and FIG. 7 together. FIG. 6 is a circuit wiring diagram of another adjustable radio frequency coupler provided by an embodiment of the present invention. FIG. 7 is a simulation diagram illustrating another adjustable RF coupler shown in FIG. 6 . As shown in FIG. 6 , the adjustable RF coupler 6 in FIG. 6 is similar in structure to the adjustable RF coupler 1 in FIG. 1 , and can be used to support 3G high frequency band 1.71-1.98 GHz. The same elements included in both will be denoted by the same reference numerals below. The difference between the adjustable RF couplers 6 and 1 lies in: the length of the effective transmission line formed by the second transmission line 63 , wherein the length refers to the path length of the effective transmission line.

In detail, it can be known from the above that when the adjustable RF coupler 1 in FIG. The line segment 131g is used to form an effective transmission line with a length of 1510um, and the coupling amount range (m1-m2) is -22.9--23.9dB. However, when it is desired that the coupling range of the adjustable RF coupler 1 for supporting the 3G high frequency band 1.71-1.98GHz can be closer to -20dB, it can be increased through the adjacent bonding pad 15' and other wires 11. Effective transmission line length.

For example, as shown in FIG. 6, the first line segment 631a and the sixth line segment 631f can be electrically connected through the wire 11, wherein, when the wire 11 is connected to the sixth line segment 631f, it is connected to On the bonding pad 15 ′ adjacent to the bonding pad 15 for trimming, the seventh line segment 631 g and the sixth line segment 631 f are electrically connected through another wire 11 to form a longer effective transmission line. Accordingly, the formed effective transmission line has a length of 1700 um, a thickness and a width of 15 um and 50 um, respectively.

It can be known that, as shown in FIG. 7 , curves C700 and C710 represent the coupling amount and isolation of the adjustable RF coupler 6 . The fine-tuned effective transmission line can make the adjustable RF coupler 6 used to support 3G high frequency band 1.71-1.98GHz, the coupling range (m1-m2) can reach -19.8--20.7dB, and the isolation range (m3-m4 ) is -55.3 ~ -62.3dB. Therefore, the coupling amount range of the adjustable radio frequency coupler 6 is closer to -20dB to meet the design requirements.

In a word, as shown in FIG. 1, when the wire 11 is directly electrically connected between the first line segment 131a and the seventh line segment 131g to form an effective transmission line, at this time, the adjustable RF coupler 1 can support high frequency Band 1.71 ~ 1.98GHz. On the other hand, as shown in FIG. 4, when the first line segment 431a and the second line segment 431b are electrically connected through the wire 11, the second line segment 431b is electrically connected to the third line segment 431c, and the second line segment 431b is electrically connected to the third line segment 431c. The three line segments 431c are connected with the fourth line segment 431d, the fourth line segment 431d is electrically connected with the fifth line segment 431e, the fifth line segment 431e is electrically connected with the sixth line segment 431f, and the sixth line segment 431f is electrically connected with the sixth line segment 431f. Between the seventh line segment 431g to form an effective transmission line, at this time, the adjustable radio frequency coupler 4 can support a low frequency band of 824-915 MHz.

It can be seen that, when the tunable RF coupler 1 needs to support the high frequency band of 1.71-1.98 GHz, the required effective transmission line is relatively short, for example, 1510 um. When the adjustable RF coupler 4 needs to support the low frequency band of 824-915 MHz, the required effective transmission line is relatively long, for example, 4100 um.

Furthermore, when it is necessary to design an adjustable RF coupler 6 that meets a specific coupling range, as shown in FIG. Effective transmission line length. That is to say, when the adjustable RF coupler 6 needs to support the high frequency band 1.71-1.98GHz, and the range of the coupling amount can be closer to -20dB, the length of the effective transmission line in the adjustable RF coupler 1 in Fig. 1 can be (for example, 1500um) for fine-tuning, so that the fine-tuned effective transmission line (for example, 1700um) can make the adjustable radio frequency coupler 6 support the high frequency band 1.71-1.98GHz, and the coupling range is closer to -20dB, so as to meet design needs.

To sum up, in other embodiments, the length of the effective transmission line can also be changed by using the wire 11 and the fine-tuning bonding pad 15', so that the adjustable RF coupler 1 is suitable for other frequency bands. In other words, those skilled in the art can design according to actual usage conditions, so the present invention is not limited thereto.

It is worth mentioning that in some practical situations, the adjustable RF coupler 1 can be shipped to downstream manufacturers without any wires 11 installed, and the downstream manufacturers can install wires 11 by themselves according to the frequency band they need to design. In adjustable RF coupler 1. Therefore, the adjustable RF coupler 10 of the present invention may not include any wires 11 when it is shipped, and then the user (such as a downstream manufacturer) installs the wires 11 to adjust the second transmission line 13 and the first transmission line 13 according to the frequency band that the individual wants to design. The coupling amount of the transmission line 12.

[How to make an adjustable RF coupler]

Please refer to FIG. 8 together with FIG. 1 . FIG. 8 is a flow chart of a manufacturing method of an adjustable radio frequency coupler provided by an embodiment of the present invention. The manufacturing method of the adjustable coupler can be implemented in the aforementioned adjustable radio frequency coupler 1 , but the present invention is not limited thereto. The steps of the manufacturing method of the adjustable radio frequency coupler in FIG. 8 are described as follows.

Firstly, in step S810 , the first transmission line 12 and the second transmission line 13 are respectively formed on two opposite surfaces of the insulating layer 10 , wherein the second transmission line 13 includes a plurality of line segments 131 a - 131 g. Then, in step S820, at least one wire 11 is arranged to electrically connect at least two wire segments. Next, in step S830 , the segments electrically connected to each other by at least one wire 11 form an effective transmission line, and the length of the effective transmission line determines the coupling amount between the first transmission line 12 and the second transmission line 13 . In step S840, it is detected whether the coupling amount between the effective transmission line and the first transmission line 12 falls within a preset coupling range. In step S850, when the coupling amount between the effective transmission line and the first transmission line 12 does not fall within the preset coupling range, the connection position between at least one conducting wire 11 and multiple segments of the second transmission line is changed. In step S860, when the coupling amount between the effective transmission line and the first transmission line 12 meets the preset coupling range, an adjustable radio frequency coupler is fabricated according to the lengths of the effective transmission line and the first transmission line 12 . Each step will be described in sequence below to better understand the disclosure.

Further, in step S810, referring to FIG. 1 and FIG. 2 , a first transmission line 12 is formed on the first surface 110 of the insulating layer 10, wherein both ends of the first transmission line 12 are electrically connected to the coupling end 17 and the isolation end 19 respectively. . In addition, the second transmission line 13 is formed on the second surface 120 opposite to the first surface 110 , wherein the second transmission line 13 includes a plurality of line segments 131 a - 131 g separated from each other. For example, the second transmission line 13 is disposed directly above the first transmission line 12 , and the second transmission line 13 is aligned with the extension path of the first transmission line 12 . In addition, one end of the second transmission line 13 is electrically connected to the RF input end 16 , and the other end of the second transmission line 13 is electrically connected to the RF output end 18 . Specifically, the adjustable RF coupler 1 includes a plurality of wire bonding pads 15, and each line segment 131a-131g has two ends, wherein one end point of the line segment 131a is electrically connected to the RF input end 16, and the other end is connected to the wire bonding pad. pad 15 , and one end of the line segment 131g is electrically connected to the RF output end 18 , and the other end is connected to the bonding pad 15 . In addition, both ends of the other line segments 131 b - 131 f are respectively connected to the wire bonding pads 15 .

Furthermore, in step S820 , the wire 11 is laid and connected between the line segment 131 a and the line segment 131 g , so that the radio frequency input terminal 16 and the radio frequency output terminal 18 can be electrically connected through the wire 11 . In short, by utilizing the connection between the wire 11 and the bonding pad 15 , the wire segment 131 a is electrically connected to the wire segment 131 g via the wire 11 .

Furthermore, in step S830, by laying wires 11 connected between the line segment 131a and the line segment 131g, the two line segments 131a, 131g form an effective transmission line of the second transmission line 13, and the two line segments 131a, 131g form the second transmission line 13 The effective length of the transmission line determines the coupling amount between the first transmission line 12 and the second transmission line 13 .

Furthermore, in step S840, an input signal is input to the radio frequency input terminal 16, and a coupling signal is generated at the coupling terminal 18. Therefore, by detecting the coupling signal, it can be known that the length and the length of the effective transmission line formed by the line segments 131a and 131g are Whether the coupling amount between the first transmission lines 12 falls within a preset coupling range. Here, if the judgment result of step S840 is yes, go to step S860, and if the judgment result of step S840 is no, go to step S850.

Further, in step S850, when the coupling amount between the effective transmission line and the first transmission line 12 does not fall within the preset coupling range, it is possible to change the connection between the wire 11 and the multiple segments of the second transmission line 13 The position, that is to say, the length of the effective transmission line in this case can be fine-tuned through the wire 11 and the adjacent bonding pad 15 ′, so that the coupling amount between the effective transmission line and the first transmission line 12 can meet the preset coupling range.

For example, as can be seen from FIG. 1 and FIG. 3 , the distance between the first transmission line 12 and the effective transmission line (for example, 1510um) formed between the first line segment 131a and the seventh line segment 131g through a wire 11 is electrically connected. The range of the coupling amount is -22.9~-23.9dB. At this time, the range of the coupling amount -22.9~-23.9dB has exceeded the preset coupling range of -20dB. Accordingly, the coupling amount between the effective transmission line and the first transmission line can be adjusted by adjusting the connection position of the wire 11 and the line segment. As shown in FIG. 6, the wires 11 can be electrically connected between the first line segment 631a and the sixth line segment 631f respectively. When the wire 11 is connected to the sixth line segment 631f, it is connected to the adjacent welding pad 15. On the bonding pad 15 ′ for fine adjustment, the sixth line segment 631 f and the seventh line segment 631 g are electrically connected through the wire 11 to form a longer effective transmission line (for example, 1700 um). Accordingly, it can be seen from FIG. 7 that the coupling amount between the fine-tuned effective transmission line and the first transmission line 12 is between -19.8˜-20.7 dB to meet the design requirements.

Further, in step S860, when the coupling amount between the effective transmission line and the first transmission line 12 meets the preset coupling range (for example, -20dB), an adjustable radio frequency is produced according to the length of the effective transmission line and the first transmission line 12 coupler1.

[Possible effects of the present invention]

To sum up, the adjustable radio frequency coupler provided by the embodiment of the present invention adjusts the effective transmission line length of the second transmission line according to the electrical connection between at least one wire and multiple line segments, and then changes the length of the second transmission line and the first transmission line. The length of overlap between one transmission line to adjust the amount of coupling between the second transmission line and the first transmission line. Accordingly, the above-mentioned adjustable radio frequency coupler can support all frequency bands of the third generation mobile communication technology (3G), so as to achieve the effect of wide frequency band and high directivity. Therefore, the number of scrapped adjustable radio frequency couplers can be reduced to reduce waste of resources.

The above is only the best specific embodiment of the present invention, but the features of the present invention are not limited thereto, and any changes or modifications that can be easily conceived by those skilled in the art within the scope of the present invention are all possible. Contained within the scope of protection of the following claims of the present invention.

Claims (11)

1. An adjustable radio frequency coupler, characterized in that, comprising: an insulating layer; a first transmission line; and A second transmission line, the second transmission line is arranged corresponding to the first transmission line, and the insulating layer is arranged between the first transmission line and the second transmission line, the second transmission line includes: a plurality of line segments separated from each other and arranged along the extension path of the first transmission line, wherein at least one wire is used to electrically connect the at least two line segments, The second transmission line has two ends, one end of the second transmission line is electrically connected to a radio frequency input end, and the other end of the second transmission line is electrically connected to a radio frequency output end. 2. The adjustable RF coupler as claimed in claim 1, wherein the at least one wire is electrically connected to the line segments for adjusting the coupling amount between the second transmission line and the first transmission line. 3. The adjustable RF coupler as claimed in claim 2, wherein the line segments electrically connected to each other through the at least one wire form an effective transmission line, and the length of the effective transmission line determines the first transmission line and the second transmission line. The amount of coupling between two transmission lines. 4. The adjustable RF coupler as claimed in claim 1, wherein the adjustable RF coupler further comprises an inductor electrically connected between the first transmission line and an isolation terminal. 5. The adjustable radio frequency coupler as claimed in claim 1, further comprising a plurality of bonding pads, at least one end of each line segment is connected to the bonding pads, and these bonding pads are used for the at least one bonding pad. wire connection. 6. A method for making an adjustable radio frequency coupler, comprising: A first transmission line and a second transmission line are respectively formed on opposite surfaces of an insulating layer, wherein the second transmission line includes a plurality of line segments, and the line segments are separated from each other; and Arranging at least one wire, wherein the at least one wire is electrically connected to the at least two line segments, wherein one end of the second transmission line is electrically connected to a radio frequency input end, and the other end of the second transmission line is electrically connected to a radio frequency output end. 7. The manufacturing method of the adjustable radio frequency coupler as claimed in claim 6, wherein the line segments electrically connected to each other through the at least one wire form an effective transmission line, and the length of the effective transmission line determines the first transmission line The amount of coupling with the second transmission line. 8. The manufacture method of the adjustable radio frequency coupler as claimed in claim 7, further comprising: detecting the amount of coupling between the active transmission line and the first transmission line; and When the coupling amount between the effective transmission line and the first transmission line does not fall within a preset coupling range, the connection position between the at least one wire and the segments of the second transmission line is changed. 9. The manufacturing method of the adjustable radio frequency coupler as claimed in claim 8, in the step of detecting the amount of coupling between the effective transmission line and the first transmission line, comprising: input an input signal at the radio frequency input terminal, and generate a coupled signal at a coupled terminal; and The coupling amount between the effective transmission line and the first transmission line is judged according to the coupling signal. 10. The manufacture method of adjustable radio frequency coupler as claimed in claim 6, further comprising: An inductor is arranged on the insulating layer, wherein the inductor is electrically connected between the first transmission line and an isolation terminal, and the inductor is opposite to the second transmission line. 11. The manufacture method of adjustable radio frequency coupler as claimed in claim 6, further comprising: A plurality of bonding pads are arranged on the insulating layer, and at least one end of each line segment is connected to the bonding pads, and the bonding pads are used for connecting the at least one wire.