CN101276960A - Broadband Antenna Architecture - Google Patents

Abstract

A broadband antenna architecture is applied to wireless signal receiving and transmitting of a mobile communication device (such as a mobile phone). An antenna is arranged on the upper edge of a circuit board with a ground plane in the mobile communication device, and a curve Line (forming Line) is arranged between the antenna and the ground plane of the circuit board; two Multilayer Ceramic capacitors (MLCCs) or Multilayer Ceramic inductors (MLCI) elements (components) are arranged on the labyrinth wire; the capacitor or the inductance element is used for isolating the coupling effect generated between the ground plane and the antenna, so that the ground plane and the antenna have enough distance to radiate energy, and the capacitor or the inductance element can not cause direct current open circuit, so that other electronic elements can be arranged near the antenna.

Description

Broadband Antenna Architecture

technical field

The present invention relates to an antenna structure, in particular to an antenna structure capable of laying other electronic components near the antenna.

Background technique

For the beauty of mobile phones, mobile phones with built-in antennas have gradually become mainstream, and flat-panel antennas are also widely used. As shown in FIG. 1 , in a mobile phone using a built-in antenna, the antenna 92 is disposed on the upper edge of the circuit board 91 , and a ground plane 911 is disposed on the bottom surface of the circuit board 91 . In order to form an electric field effect between the antenna 92 and the ground plane 911 , an insulating clearance area S must be provided between them; at the same time, other electronic components cannot be arranged on the clearance area S to avoid crosstalk. Generally, the width t of the clearance zone S is at least 7 mm.

This traditional antenna structure design will increase the size of the mobile phone, which does not meet the requirements of compact mobile communication devices and needs to be improved.

Contents of the invention

The present invention provides a broadband antenna structure, which is applied to the wireless signal transmission and reception of mobile communication devices (such as mobile phones). An antenna is provided on the upper edge of the circuit board with a ground plane in the mobile communication device, and a meandering line (Meandering Line) is set between the antenna and the ground plane of the circuit board; two laminated ceramics are arranged on the meandering line Capacitor (Multilayer Ceramic Capacitor, MLCC) or multilayer ceramic inductor (Multilayer Ceramic Inductor, MLCI) component (Component); use this capacitor or inductance component to isolate the coupling effect between the ground plane and the antenna, so that there is enough space between the ground plane and the antenna The energy is radiated at a certain distance, and the capacitive or inductive element will not cause a direct current open circuit, so that other electronic components can be placed near the antenna.

The main purpose of the broadband antenna architecture provided by the present invention is to realize the design of the antenna without reducing the area of the ground plane, so that there is no need for a large clearance area between the antenna and the ground plane, so that the distance between the antenna and the ground plane The width of the headroom between them can be reduced from 7mm to 2mm.

The operating frequency (Operated Frequency) of the broadband antenna architecture provided by the present invention may include operating frequencies of GSM850, AMPS850, CDMA800, GSM900, DCS and WCDMA.

Description of drawings

Figure 1: is an existing antenna architecture,

Fig. 2: is the exterior view of the first embodiment of the present invention,

Fig. 3: is the standing wave ratio diagram obtained by testing the embodiment of Fig. 2,

Fig. 4: is the exterior view of the second embodiment of the present invention,

Fig. 5 is a standing wave ratio diagram obtained by testing the embodiment of Fig. 4 .

Detailed ways

With reference to Fig. 2, have shown the first embodiment of the present invention, this broadband antenna framework is applied to the wireless signal transmission and reception of mobile communication device (for example mobile phone), is provided with an antenna 20 on the upper edge of circuit board 10 in mobile communication device, and The bottom surface of the circuit board is provided with a ground plane 11 . The antenna 20 has a radiating metal element 21 and is connected to a feed-in pin 22 through a coaxial cable (not shown). According to this embodiment, the antenna 20 is a planar antenna whose length, width and height are 40 mm (L) x 1 mm (W) x 6 mm (H).

The feature of the present invention is mainly that a curved line 30 formed by a conductor is set in the clearance area S between the antenna 20 and the ground plane 11 of the circuit board 10, that is, as shown in FIG. 2 , on the upper surface of the circuit board 10 (the surface opposite to the bottom surface where the ground plane 11 is located), between the upper edge of the ground plane 11 on the bottom surface of the circuit board 10 (as shown by the dotted line) and the antenna 20 (that is, in the clearance zone S) The meander line 30 . The meander line 30 is provided with two multilayer ceramic capacitors or multilayer ceramic inductance elements 31, 32 connected in parallel with the meander line 30, and the meander line 30 is not electrically connected to any other circuit parts except the meander line 30. connect.

As shown in FIG. 2, the inductance elements 31, 32 are arranged on the meander line 30 with a predetermined sufficient distance apart, and all the pins (not shown) of the inductance elements 31, 32 are all connected on the meander line 30, But the pins themselves are not in direct contact with each other.

According to one embodiment, the elements 31, 32 may both be inductive elements. The principle of using elements 31, 32 is: since parasitic elements can be used to increase the frequency bandwidth, the elements 31, 32 are arranged on the curved line to play the role of parasitic elements, and this effect is enhanced. In addition, since the parasitic elements in the high-frequency circuit can be either open or short circuit, the elements 31 and 32 used in the present invention can be inductive elements, capacitive elements or resistive elements or any combination of these elements. According to a specific embodiment, two 12nh inductive elements are used as elements 31 , 32 . According to other implementation manners, according to the specific requirements of different antennas, the inductance values of the inductance elements 31 and 32 can be adjusted to change the frequency resonance point and the frequency bandwidth.

Since when using capacitive elements or inductive elements (of course, it is also possible to be any combination of resistive elements or capacitance, inductance, and resistive elements) as elements 31 and 32, when the antenna receives and transmits high-frequency signals, the antenna 20 and the ground Between the two closest parts of the ground 11, the circuit formed by the meander 30 and the elements 31, 32 connected in parallel with it blocks the inductive action of the antenna 20 on the ground plane 11 and its closest part, thereby preventing the ground plane 11 from being connected to the ground 11 and its closest part. The mutual coupling effect caused by the ground plane 11 being too close to the antenna 20 thus prevents adverse effects on the performance of the antenna 20 caused by the ground plane 11 being too close to the antenna 20 . In this way, the capacitance or inductance elements 31, 32 on the meander line 30 are used to isolate the coupling effect generated between the ground plane 11 and the antenna 20, so that there is enough distance between the ground plane 11 and the antenna 20 to radiate energy, and the capacitance or The inductance elements 31 and 32 are connected in parallel with the meander line, which will not cause a direct current open circuit, so that other electronic elements can be laid near the antenna 20 .

In addition, the purpose of the present invention is to realize the design of the antenna 20 without reducing the area of the ground plane 11 , so there is no need for a large clearance area S between the antenna 20 and the ground plane 11 . According to the present invention, the width of the clearance zone S between the antenna 20 and the ground plane 11 can be reduced from the original 7 mm to 2 mm, and preferably 3 mm.

FIG. 3 shows a voltage standing wave ratio (VSWR) diagram obtained by testing the first embodiment of the present invention, and the following table shows the 3D gain (Gain) and efficiency (Efficiency) obtained after the test.

performance GSM850/CDMA800 GSM900 GSM1800 GSM1900 WCDMA 3D gain -3.4 -3.1 -2.89 -4.1 -4.95 efficiency 45% 48.5% 52.2% 40% 32%

It can be seen that the actual measurement results of the broadband antenna architecture according to the first embodiment of the present invention show that the broadband antenna architecture has quite good impedance bandwidth characteristics and radiation efficiency. Therefore, the operating frequencies of the broadband antenna architecture provided by the present invention may include operating frequencies of GSM850, AMPS850, CDMA800, GSM900, DCS and WCDMA.

Referring to FIG. 4, a second embodiment of the present invention is shown. The difference between this second embodiment and the first embodiment shown in FIG. And the feeding pin 42, the length, width and height of the antenna are 22mm (L) x 8mm (W) x 5.3mm (H).

FIG. 5 shows a voltage standing wave ratio (VSWR) diagram obtained by testing the second embodiment of the present invention, and the following table shows the 3D gain (Gain) and efficiency (Efficiency) obtained by the test.

performance GSM850/CDMA800 GSM900 GSM1800 GSM1900 WCDMA 3D gain -4.2 -3.5 -3.0 -2.1 -3.0 efficiency 35% 45% 50% 60% 50%

It can be seen that the actual measurement results of the broadband antenna architecture of the second embodiment of the present invention also show that the broadband antenna architecture has quite good impedance bandwidth characteristics and radiation efficiency.

In summary, the present invention utilizes the MLCC or MLCI element arranged on the curved line, with the help of this structure, the width of the clearance area between the antenna and the ground plane can be reduced, and other electronic components can be arranged near the antenna. The effect of reducing the size of the entire mobile communication device is achieved.

Claims (5)

1. A broadband antenna architecture for wireless signal transmission and reception of mobile communication devices; comprising: a circuit board, the circuit board is disposed in the mobile communication device, and the circuit board has at least one ground plane; an antenna, the antenna is mounted on the upper edge of the circuit board, and the antenna has a radiating metal element; A curved line, the curved line is arranged between the antenna and the ground plane of the circuit board, two laminated ceramic capacitors or laminated ceramic inductive elements are arranged on the curved line, and the capacitor or inductive element is used for To isolate the coupling effect generated between the ground plane and the antenna, so that there is a sufficient distance between the ground plane and the antenna to radiate energy, and the capacitor or inductance element will not cause a DC open circuit, making other Electronic components can be placed near the antenna. 2. The broadband antenna architecture according to claim 1, wherein said antenna is a flat panel antenna. 3. The broadband antenna architecture according to claim 1, wherein said antenna is a multi-layer folded antenna. 4. The broadband antenna architecture according to claim 1, wherein the distance between the antenna and the ground plane is about 3mm. 5. The broadband antenna architecture according to claim 1, wherein the operating frequency of the antenna architecture at least includes at least one of the operating frequencies of GSM850, AMPS850, CDMA800, GSM900, DCS and WCDMA.

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