CN104347921B - Power Dividers and RF Devices - Google Patents

Abstract

A power divider and a radio frequency device are provided. The power distributor is used for transmitting signals of an input end to a plurality of output ends and comprises: the rectangular microstrip line is coupled to the input end; and a plurality of coupling units, which are used for conducting the rectangular microstrip line and the plurality of output ends in an electromagnetic coupling mode and are respectively away from the rectangular microstrip line by a first distance, each coupling unit comprises at least one double-L-shaped resonator, and each coupling unit is arranged between the rectangular microstrip line and the output end and comprises: the first long side and the second long side are both approximately parallel to the rectangular microstrip line; a first short side which is approximately perpendicular to the first long side and extends from one end of the first long side to the central line of the double-L-shaped resonator; the second short side is approximately vertical to the second long side, extends from one end of the second long side to the central line, is opposite to one end of the first short side, and is separated from the end of the first short side by a second distance; the first long edge is adjacent to the rectangular microstrip line, and the second long edge is coupled to the output end. The invention can reduce area and loss, and has filtering function.

Description

Power Dividers and RF Devices

technical field

The invention relates to a power divider and a radio frequency device, in particular to a power divider and a radio frequency device which can improve the performance of an array antenna while effectively reducing the required area.

Background technique

An array antenna is an antenna system composed of multiple identical antennas arranged according to a certain rule, and is widely used in radar systems, such as microwave/millimeter wave radar systems. In an array antenna, in order to achieve a specific radiation pattern, or to meet the specific weight distribution among the antennas, the known technology is to connect filters in series at the input end of the array antenna, and use them as power dividers to achieve the required power of each radiation body. amplitude and phase. Generally speaking, the array antenna and the power divider are independently designed and directly connected in series, which often cannot be integrated efficiently. At the same time, the problem of impedance mismatch needs to be considered. Although an additional matching circuit can be designed to improve performance, it has to pay the price of increased area and increased cost, which will lead to a decrease in antenna gain and a shorter detection radar distance. And disadvantages such as narrow scan angle.

Therefore, how to improve the efficiency of the array antenna while effectively reducing the required area has become a goal of the industry.

Therefore, it is necessary to provide a power splitter and a radio frequency device to solve the above problems.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a power divider and a radio frequency device, which can effectively reduce the required area while improving the performance of the array antenna.

The present invention discloses a power divider, which is used to transmit a signal at an input terminal to multiple output terminals. The power divider includes: a rectangular microstrip line coupled to the input terminal; and A plurality of coupling units, the plurality of coupling units conduct the rectangular microstrip line and the plurality of output terminals in an electromagnetic coupling manner, the plurality of coupling units are respectively separated from the rectangular microstrip line by a first distance, and each coupling unit Including at least one double L-shaped resonator, the at least one double L-shaped resonator is arranged between the rectangular microstrip line and an output end, and each double L-shaped resonator includes: a first long side, the first long side is substantially parallel On the rectangular microstrip line; a first short side, the first short side is approximately perpendicular to the first long side, and extends from one end of the first long side to a centerline of the double L-shaped resonator; a A second long side, the second long side is approximately parallel to the rectangular microstrip line; and a second short side, the second short side is approximately perpendicular to the second long side, and extends from one end of the second long side to the second long side The center line extends opposite to one end of the first short side and is separated from the end of the first short side by a second distance; wherein a first long side of the at least one double L-shaped resonator is adjacent to A second long side of the rectangular microstrip line is coupled to the output end; wherein, the first spacing and the second spacing are related to a power ratio from the input end to the plurality of output ends.

The present invention also discloses a radio frequency device, the radio frequency device includes: a power divider, the power divider is used to transmit the signal of an input end to a plurality of output ends, the power divider includes: a rectangular microstrip line, the rectangular microstrip The strip line is coupled to the input end; and a plurality of coupling units, the plurality of coupling units conduct the rectangular microstrip line and the plurality of output ends in an electromagnetic coupling manner, and the plurality of coupling units are respectively connected to the rectangular microstrip line Each coupling unit includes at least one double L-shaped resonator at a distance of a first distance, and the at least one double L-shaped resonator is arranged between the rectangular microstrip line and an output end, and each double L-shaped resonator includes: a first A long side, the first long side is roughly parallel to the rectangular microstrip line; a first short side, the first short side is roughly perpendicular to the first long side, and extends from one end of the first long side to the double L A centerline of the shaped resonator extends; a second long side, the second long side is approximately parallel to the rectangular microstrip line; and a second short side, the second short side is approximately perpendicular to the second long side, And extending from one end of the second long side to the centerline, opposite to one end of the first short side, and a second distance from the end of the first short side; wherein, the at least one double L-shaped resonator One of the first long sides is adjacent to the rectangular microstrip line, a second long side is coupled to the output end; and a plurality of antennas, the plurality of antennas are coupled to the plurality of output ends, and each antenna includes : a plurality of radiating elements, each radiating element is roughly a quadrilateral, has a first side, a second side, a third side and a fourth side, the first side is roughly parallel to the third side, the first side two sides are substantially parallel to the fourth side, and the first side is substantially perpendicular to the second side, wherein each radiator forms a first notch on the second side and a second notch on the fourth side; and a plurality of extending columns, each extending column extends from the second notch on the fourth side of one of the plurality of radiating elements to the first notch on the second side of the other radiating element, so that the A plurality of radiating elements are arranged in a sequence; wherein, the first notch of the plurality of radiating elements on the second side of the first radiating element in the sequence is separated from an output end of the plurality of output ends by a third distance; Wherein, the first distance, the second distance and the third distance are related to the power ratio from the input terminal to the plurality of output terminals.

The present invention can avoid the use of additional matching circuits at the connection between the array antenna and the power divider, thereby reducing the area and reducing the loss caused by signal transmission, and can also have a filtering function to provide good frequency selectivity and isolate necessary signal sources.

Description of drawings

FIG. 1A is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 1B is a schematic diagram of the detailed structure of the power divider and the array antenna in FIG. 1A .

FIG. 2 is an equivalent circuit diagram of the radio frequency device in FIG. 1A .

FIG. 3 is a functional block diagram of the radio frequency device in FIG. 1A .

FIG. 4A is a frequency response diagram of the radio frequency device in FIG. 1A .

FIG. 4B is an azimuth antenna radiation pattern of the radio frequency device in FIG. 1A .

FIG. 4C is a high and low angle antenna radiation pattern of the radio frequency device in FIG. 1A .

FIG. 4D is a graph showing the variation of antenna gain with frequency of the radio frequency device in FIG. 1A .

FIG. 5 is a schematic diagram of a radio frequency system according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a radio frequency system according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a power splitter according to an embodiment of the present invention.

FIG. 8A is a schematic diagram of a radio frequency device according to an embodiment of the present invention.

FIG. 8B is a functional block diagram of the radio frequency device in FIG. 8A.

Description of main component symbols:

10, 80 radio frequency device

12, 70 power splitter

14 Array Antennas

140, 142, Ant_1～Ant_i Antennas

16 inputs

120 Rectangular Microstrip Line

122, 124, CU_1～CU_i coupling unit

CL1, CL2 Centerline

126 first long side

128 First short side

130 second long side

132 second short side

20 Equivalent Circuit

d1 first spacing

d2 second spacing

d3 third spacing

d4 fourth distance

RAT Radiator

BR extension column

L1 first side

L2 second side

L3 third side

L4 fourth side

CV1 first gap

CV2 second notch

EXT_1 First L-shaped extension

EXT_2 Second L-shaped extension

w1, w2 line width

l1, l2 line length

g1, g2 Antenna slot line size

Z ₀ input impedance

L ₁ , L ₂ , L _A inductance

C ₁ , C ₂ , C _A capacitance

Z _A Impedance

J ₀₁ , J ₁₂ , J ₂₃ admittance

Functional box of R ₁ , R ₂ , R ₁₁ ～R _ij L-shaped resonator

R _A , R _1A ～R _iA antenna function box

M ₁₂ , M ₂₃ , M _11,12 ～M _ij,ij , M _1j,1A ～M _ij,iA coupling coefficient

50, 60 RF system

52, 54, 62, 64 RF devices

500, 600 couplings

502, 602, 72 inputs

700 shape microstrip line

702, 704 coupling unit

74, 76 output terminal

Sig input signal

RES_11～RES_ij L-shaped resonators

detailed description

In order to improve the shortcomings of the known technology, the present invention integrates the array antenna and the power divider, and uses a coplanar waveguide (CPW) coupling structure to connect the power divider and the antenna in a coupling manner. In this way, the array antenna and the power divider can avoid using an additional matching circuit at the key connection, so as to reduce the area and reduce the loss caused by signal transmission, so as to achieve high gain and increase the detection angle, while reducing the manufacturing cost. In addition, since the antenna array and the power divider of the present invention can be integrated into a function block, the variation can be reduced and the stability can be improved during system design; and the power divider can have a filtering function to provide good frequency Selectivity and isolate unwanted signal sources. Furthermore, the present invention can also connect multiple resonators in series to achieve a wider frequency response and effectively improve impedance matching.

For details, please refer to FIG. 1A , which is a schematic diagram of a radio frequency device 10 according to an embodiment of the present invention. The radio frequency device 10 includes a power divider 12 and an array antenna 14 , the power divider 12 can transmit a signal from an input terminal 16 to the array antenna 14 . The power divider 12 includes a rectangular microstrip line 120 and coupling units 122 , 124 , and the array antenna 14 includes antennas 140 , 142 . In this embodiment, the power divider 12 and the array antenna 14 have a symmetrical structure with respect to a central line CL1 of the rectangular microstrip line 120. In other words, the coupling units 122, 124 have the same structure, and the antennas 140, 142 have the same structure. Simultaneously, antenna 140,142 is the sequence formed by the same radiator and extension column, therefore, for simplicity, the details of power splitter 12 and array antenna 14 will be described below by taking the front end of coupling unit 122 and antenna 140 as an example. structure. However, it should be noted that the radio frequency device 10 in FIG. 1A is only an embodiment of the present invention, and is used to illustrate the concept of the present invention, but not limited thereto.

Please refer further to FIG. 1B . FIG. 1B is a detailed structural diagram of the power divider 12 and the array antenna 14 , wherein only the front end of the array antenna 14 is shown, and the overall structure can be obtained by referring to FIG. 1A and FIG. 1B at the same time. As shown in FIG. 1B , the coupling unit 122 is a double L-shaped resonator, which includes a first long side 126 , a first short side 128 , a second long side 130 and a second short side 132 . The first long side 126 and the first short side 128 form an L-shaped resonator, and the second long side 130 and the second short side 132 form another L-shaped resonator, and this double L-shaped resonator is relative to both The center line CL2 is a symmetrical structure. In addition, it can be seen from FIG. 1B that the first long side 126 and the second long side 130 are approximately parallel to the rectangular microstrip line 120, the shortest distance between the first long side 126 and the rectangular microstrip line 120 is a first distance d1, and the second One end of the two long sides 130 is integrated with the antenna 140 in a coplanar waveguide manner, and transmits signals in a coupling manner, so it can be regarded as an output end. The first short side 128 and the second short side 132 are perpendicular to the first long side 126 and the second long side 130 respectively, and extend toward the center line CL2 from the first long side 126 and the second long side 130, so that the first short side The shortest distance between 128 and the second short side 132 is a second distance d2, and energy is transferred in a capacitive coupling manner. In addition, the antennas 140 and 142 are composed of 10 radiating elements RAT and 9 extending columns BR arranged in a sequence, and signals are transmitted between the radiating elements RAT and the extending columns BR through electromagnetic coupling. In detail, as shown in FIG. 1B, the radiation element RAT is roughly a quadrilateral, with a first side L1, a second side L2, a third side L3 and a fourth side L4, the first side L1 and the third side The side L3 is substantially parallel, the second side L2 is substantially parallel to the fourth side L4, and the first side L1 is substantially perpendicular to the second side L2. In addition, a first notch CV1 is formed on the second side L2 of the radiator RAT to couple the array antenna 14 through a coplanar waveguide, and a second notch CV2 is formed on the fourth side L4 to facilitate serial connection of the radiator RAT. That is to say, the second long side 130 extends to the first notch CV1 of the foremost radiating element RAT and is separated from the radiating element RAT by a third distance d3 and a fourth distance d4 (horizontally and vertically). The second notch CV2 of the first radiating element RAT extends to the first notch CV1 of the next radiating element RAT, and so on to form a radiator sequence composed of the radiating element RAT and the extending column BR. Wherein, the length of the first side L1 or the third side L3 of the extension column BR and the radiation element RAT is half of the corresponding wavelength of the working frequency. In addition, a first L-shaped extension EXT_1 and a second L-shaped extension EXT_2 extend from the first side L1 and the third side L3 of each radiator RAT, which can be used to adjust parameters such as impedance matching or frequency band.

From the above, it can be known that the power divider 12 and the array antenna 14 are coupled and connected through the coplanar waveguide coupling structure, thus avoiding the use of an additional matching circuit at the critical connection between the two, effectively reducing the area, and reducing the noise caused by signal transmission. loss. When transmitting, the signal is input to the rectangular microstrip line 120 from the input terminal 16, and then the signal is coupled to the side edges of the coupling units 122 and 124 by means of side coupling (taking the coupling unit 122 as an example, that is, the first long side 126 ), therefore adjusting the first distance d1 can control the signal energy fed from the rectangular microstrip line 120 to the coupling units 122 and 124 . Similarly, the distance between the short sides of the double L-shaped resonators, that is, the second distance d2, is also related to the signal energy from one L-shaped resonator to the other L-shaped resonator. The coupling units 122, 124 transmit signals to the antennas 140, 142 in the form of coplanar waveguides, so the distance between the coupling units 122, 124 and the antennas 140, 142 (taking the coupling unit 122 as an example, that is, the third distance d3 and the fourth distance d4) is also related to the magnitude of the signal energy from the coupling units 122 , 124 to the antennas 140 , 142 . In this case, those skilled in the art can appropriately adjust the first distance d1 to the fourth distance d4 according to the requirements of the system, so as to control the signal energy from the input terminal 16 to the antennas 140 and 142 . Generally speaking, the greater the amount of coupling, the smaller the required spacing, and the bandwidth increases accordingly.

In addition, the length of the two L-shaped resonators in the coupling unit 122, 124 (take the coupling unit 122 as an example, that is, the sum of the lengths of the first long side 126 and the first short side 128, or the length of the second long side 130 and the length of the second short side 132 ) are respectively one-half of the corresponding wavelength of the operating frequency, and the line widths w1, w2 or line lengths l1, l2 can also control the operating frequency. Furthermore, the size of the antenna slots g1 and g2 , the shape or size of the first notch CV1 and the second notch CV2 , the distance between the radiators RAT, etc. can also adjust the resonant frequency and input energy. Therefore, for a specific bandwidth, as long as a specific coupling coefficient is satisfied, the line width and line length of the L-shaped resonator can be changed with different structures, and there is a greater degree of freedom in design.

In this case, an equivalent circuit 20 of the radio frequency device 10 can be derived, as shown in FIG. 2 . In FIG. 2, Z ₀ represents the input impedance of the radio frequency device 10; the inductance L ₁ and the capacitance C ₁ connected in parallel are an L-shaped resonator (taking the coupling unit 122 as an example, that is, the first long side 126 and the first short side 128 The equivalent circuit of an L-shaped resonator); the parallel inductor L ₂ and capacitor C ₂ are another L-shaped resonator (take the coupling unit 122 as an example, that is, the second long side 130 and the second short side 132 constitute The equivalent circuit of the L-shaped resonator); and the equivalent circuit of the antenna 140 is the impedance Z _A , the inductance L _A , and the capacitance C _A connected in parallel. In addition, the coupling coefficients of the rectangular microstrip line 120, the coupling units 122, 124, and the antennas 140, 142 are equivalent to an admittance inverter (JInverter), that is, the admittance J ₀₁ represents the rectangular microstrip line 120 and the coupling unit 122 , 124, the admittance J ₁₂ represents the coupling coefficient between the two L-shaped resonators in the coupling unit 122,124, and the admittance J ₂₃ represents the coupling coefficient between the coupling unit 122,124 and the antenna 140,142. The equivalent circuit 20 can be analyzed by filter theory, and the expected frequency response can be designed by given the required specification information such as resonant frequency and bandwidth.

In addition, due to the length of the radiating elements of the antennas 140, 142 (ie, the first side L1 or the third side L3), the length of the extension column BR, and the length of the L-shaped resonator (taking the coupling unit 122 as an example, that is, the first long side 126 and the length sum of the first short side 128, or the sum of the lengths of the second long side 130 and the second short side 132) are both half wavelengths of the signal to be transmitted, so the antennas 140, 142 can be regarded as the power splitter 12 part of the L-shaped resonator. In this case, the radio frequency device 10 can be further simplified into a functional block diagram, as shown in FIG. 3 . Among them, R ₁ and R ₂ represent the functional blocks of the two L-shaped resonators in the coupling units 122, 124, and R _A represents the functional blocks of the antennas 140, 142; the coupling coefficient between the two L-shaped resonators is represented by M ₁₂ , and the coupling coefficient between the coupling units 122, 124 and the antennas 140, 142 is denoted by M ₂₃ . Thus, the design process can be effectively simplified.

For example, if the required coupling coefficients M ₁₂ and M ₂₃ are between 0.001 and 1, in addition to setting the length of the radiation element of the antenna 140, 142, the length of the extension column BR and the L-shape according to the frequency of the signal to be transmitted In addition to the length of the resonator, the first distance d1 to the fourth distance d4 can be further adjusted to be between 10 mm and 0.05 mm respectively, and then the characteristic diagrams shown in FIGS. 4A to 4D can be obtained. Wherein, FIG. 4A is a frequency response diagram of the radio frequency device 10, FIG. 4B is an azimuth antenna radiation pattern of the radio frequency device 10, FIG. 4C is a high and low angle antenna radiation pattern of the radio frequency device 10, and FIG. 4D is an antenna of the radio frequency device 10 Gain versus frequency graph. As can be seen from FIG. 4A , since the array antenna 14 is integrated with the power divider 12 , the bandwidth can be effectively increased and the impedance characteristics will not be shifted due to individual independent designs and serial connection. It can be seen from FIG. 4C that the beam of the array antenna 14 can be effectively concentrated. In addition, it can be seen from FIG. 4D that the radio frequency device 10 has a filtering effect and has multiple transmission zeros, so there is less radiation outside the working frequency band, which can reduce interference and increase frequency selectivity.

It can be seen from the above that the present invention conducts the rectangular microstrip line 120 and the antenna 140, 142 in an electromagnetic coupling manner through the coupling units 122, 124, so the first distance d1 to the fourth distance d4, the two Ls in the coupling units 122, 124 The length of the shaped resonator, the line width w1, w2, the line length l1, l2, the size of the antenna slot line g1, g2, the shape or size of the first notch CV1 or the second notch CV2, the distance between the radiator RAT, etc. can be used Controlling the amount of signal coupling from the input terminal 16 to the antennas 140 and 142 avoids using an extra matching circuit at the connection between the array antenna 14 and the power splitter 12, thereby reducing the area and reducing the loss caused by signal transmission.

It should be noted that the radio frequency device 10 in FIG. 1A is an embodiment of the present invention, and those skilled in the art can make various modifications accordingly, and are not limited thereto. For example, the second notch CV2 is convenient for setting the extension column BR to connect the radiating element RAT in series. However, in one embodiment, if only a single radiating element RAT is required or the space limitation is small, the second notch CV2 may not be needed. ; Similarly, the first gap CV1 also has the same characteristics. In addition, in the radio frequency device 10, the input terminal 16 can be a signal pin, a connecting column (Via), etc., which are directly or electrically connected to the rectangular microstrip line 120, that is, the signal at the input terminal 16 is directly fed into the rectangular microstrip line 120. Strip line 120. In addition, the input end 16 can also be coupled to the rectangular microstrip line 120 through a coupling element in an electromagnetic coupling manner. In FIG. 1A and FIG. 1B , the double L-shaped resonators (that is, the coupling units 122 and 124 ) are arranged in such a way that the long sides are roughly aligned, but it is not limited thereto, and can also be appropriately adjusted according to system requirements. On the other hand, in the radio frequency device 10 , the array antenna 14 is a 2×10 array antenna structure, which includes two sub-array antennas (or antenna sequences), and each sub-array antenna includes 10 radiators. However, it is not limited thereto, and those skilled in the art can also increase or decrease the number of radiators included in each sub-array antenna (for example, greater than or equal to 1), or increase the number of sub-array antennas.

For example, please refer to FIG. 5 , which is a schematic diagram of a radio frequency system 50 according to an embodiment of the present invention. The radio frequency system 50 is a 4×10 array antenna structure, which includes radio frequency devices 52 , 54 and a coupling element 500 . Comparing Fig. 5 and Fig. 1A, it can be seen that the radio frequency device 52 is the same as the radio frequency device 10, and the radio frequency device 54 is the mirror image of the radio frequency device 52, so the relevant operation method can refer to the above description, and it can also avoid the connection between the array antenna and the power divider Additional matching circuits are used to reduce the area and reduce the loss caused by signal transmission. In addition, one end of the coupling element 500 is electrically connected to an input end 502 , and feeds signals into the rectangular microstrip line shared by the radio frequency devices 52 and 54 through electromagnetic coupling. On the other hand, please refer to FIG. 6 , which is a schematic diagram of a radio frequency system 60 according to an embodiment of the present invention. The radio frequency system 60 is an 8×10 array antenna structure, which includes radio frequency devices 62 , 64 and a coupling element 600 . Comparing Fig. 6 and Fig. 5, it can be seen that the radio frequency devices 62, 64 are the same as the radio frequency device 50, and have a relationship of mirror images up and down, so the relevant operation methods can refer to the above description, which can also avoid the connection between the array antenna and the power divider. Use additional matching circuits to reduce the area and reduce the loss caused by signal transmission. In addition, one end of the coupling element 600 is electrically connected to an input end 602 , and feeds signals into the rectangular microstrip lines of the radio frequency devices 62 and 64 through electromagnetic coupling.

The above radio frequency systems 50 and 60 illustrate that the present invention can properly derive multiple sub-array antennas to concentrate beams and achieve high directivity, which is further suitable for long-distance transmission. In addition, it can be seen from the foregoing that the radio frequency device 10 has many adjustable parameters. In this case, by adjusting these parameters, the signal energy distributed by each sub-array antenna can be in a specific proportion. For example, in an embodiment, the By adjusting the spacing, the energy distribution ratios of the four sub-array antennas from top to bottom in the radio frequency system 60 in FIG. row subarray antenna.

On the other hand, in the foregoing embodiments, the coupling units (such as 122 and 124 in FIG. 1A) only include a pair of L-shaped resonators, that is, include a third-order adjustable coupling coefficient (determined by the distance d1-d3, or refer to Admittances J ₀₁ , J ₁₂ , J ₂₃ of FIG. 2 ). However, it is not limited thereto, and in other embodiments, the coupling unit may also be composed of multiple double L-shaped resonators. For example, FIG. 7 is a schematic diagram of a power divider 70 according to an embodiment of the present invention. The power divider 70 is used for distributing the signal of an input terminal 72 to the output terminals 74 and 76, which can replace the power divider 12 of FIG. 1A. The structure of the power divider 70 is similar to that of the power divider 12 , and also includes a rectangular microstrip line 700 and coupling units 702 and 704 . The difference is that the coupling units 702 and 704 respectively include two double L-shaped resonators. In other words, the power divider 70 has two more adjustable coupling coefficients than the power divider 12 , so it has more design flexibility to meet different system requirements. In addition, the double L-shaped resonators included in the power divider 70 are arranged in such a way that their long sides are roughly aligned, but they can also be appropriately staggered according to system requirements, and are not limited thereto.

Continuing the embodiment of FIG. 7 and following the way of adding sub-array antennas in FIG. 5 and FIG. 6 , the present invention can further derive a radio frequency device 80 with 1×i and j-order coupling coefficient, as shown in FIG. 8A . As shown in FIG. 8A , the radio frequency device 80 is used to conduct an input signal Sig to i antennas Ant_1˜Ant_i through the coupling units CU_1˜CU_i, and each coupling unit includes j L-shaped resonators RES_11˜RES_1j, . . . , RES_i1～RES_ij. Therefore, a functional block diagram of the radio frequency device 80 is shown in FIG. 8B . Among them, R ₁₁ ～R _ij represent the functional blocks of i×j L-shaped resonators, and R _1A ～R _iA represent the functional blocks of antennas Ant_1～Ant_i; M _11,12 ～M _ij,ij represent the L-shaped resonators and M _1j,1A ˜M _ij,iA represent the coupling coefficients between the coupling units CU_1 ˜CU_i and the antennas Ant_1 ˜Ant_i.

The radio frequency device 80 is derived from the above-mentioned embodiments to have more L-shaped resonators, so it has more design flexibility, related changes can be referred to above, and will not be repeated here.

In summary, the present invention conducts the rectangular microstrip line and the antenna in an electromagnetic coupling manner through the coupling unit, so the spacing, length, line width, shape or size of the gap, and the distance between the radiators of each component can be used to control The amount of signal coupling between the input terminal and the antenna can avoid using an additional matching circuit at the connection between the array antenna and the power divider, thereby reducing the area and reducing the loss caused by signal transmission. It can also have a filtering function to Provides good frequency selectivity and isolates unwanted signal sources.

Claims (10)

1. A power divider, the power divider is used to transmit the signal of an input to a plurality of output terminals, the power divider comprises: a rectangular microstrip line coupled to the input terminal; and A plurality of coupling units, the plurality of coupling units conduct the rectangular microstrip line and the plurality of output terminals in an electromagnetic coupling manner, the plurality of coupling units are respectively separated from the rectangular microstrip line by a first distance, and each coupling unit Including at least one double L-shaped resonator, the at least one double L-shaped resonator is arranged between the rectangular microstrip line and an output end, and each double L-shaped resonator includes: a first long side, the first long side is substantially parallel to the rectangular microstrip line; a first short side, the first short side is approximately perpendicular to the first long side, and extends from one end of the first long side to a centerline of the double L-shaped resonator; a second long side substantially parallel to the rectangular microstrip line; and A second short side, the second short side is substantially perpendicular to the second long side, and extends from one end of the second long side to the center line, opposite to the one end of the first short side, and with the first the ends of the short sides are separated by a second spacing; Wherein, a first long side of the at least one double L-shaped resonator is adjacent to the rectangular microstrip line, and a second long side is coupled to the output end; Wherein, the first distance and the second distance are related to the power ratio from the input terminal to the plurality of output terminals. 2. The power divider as claimed in claim 1, wherein the rectangular microstrip line is directly connected to the input end. 3. The power divider as claimed in claim 1, further comprising a coupling member electrically connected to the input end and coupled to the rectangular microstrip line in an electromagnetic coupling manner, so that the rectangular The microstrip line is coupled to the input end through the coupling element. 4. The power divider as claimed in claim 1, wherein the at least one double L-shaped resonator is disposed between the rectangular microstrip line and the output end in a manner that the long sides are substantially aligned. 5. A radio frequency device, the radio frequency device comprising: A power divider, the power divider is used to transmit the signal of an input terminal to a plurality of output terminals, the power divider includes: a rectangular microstrip line coupled to the input terminal; and A plurality of coupling units, the plurality of coupling units conduct the rectangular microstrip line and the plurality of output terminals in an electromagnetic coupling manner, the plurality of coupling units are respectively separated from the rectangular microstrip line by a first distance, and each coupling unit Including at least one double L-shaped resonator, the at least one double L-shaped resonator is arranged between the rectangular microstrip line and an output end, and each double L-shaped resonator includes: a first long side, the first long side is substantially parallel to the rectangular microstrip line; a first short side, the first short side is approximately perpendicular to the first long side, and extends from one end of the first long side to a centerline of the double L-shaped resonator; a second long side substantially parallel to the rectangular microstrip line; and A second short side, the second short side is substantially perpendicular to the second long side, and extends from one end of the second long side to the center line, opposite to the one end of the first short side, and with the first the ends of the short sides are separated by a second spacing; Wherein, a first long side of the at least one double L-shaped resonator is adjacent to the rectangular microstrip line, and a second long side is coupled to the output end; and A plurality of antennas, the plurality of antennas are coupled to the plurality of output ends, each antenna includes: A plurality of radiating elements, each radiating element is roughly a quadrilateral, with a first side, a second side, a third side and a fourth side, the first side is roughly parallel to the third side, the second a side is substantially parallel to the fourth side, and the first side is substantially perpendicular to the second side, wherein each radiating element forms a first notch on the second side and a second notch on the fourth side; and A plurality of extension columns, each extension column extends from the second notch on the fourth side of one of the plurality of radiating elements to the first notch on the second side of the other radiating element, so that the plurality of radiating elements The radiation elements are arranged in a sequence; Wherein, the plurality of radiating elements are located at the first radiating element in the sequence on the second side of the first notch and an output end of the plurality of output ends is separated by a third distance; Wherein, the first distance, the second distance and the third distance are related to the power ratio from the input terminal to the plurality of output terminals. 6. The radio frequency device as claimed in claim 5, wherein the rectangular microstrip line is directly connected to the input end. 7. The radio frequency device as claimed in claim 5, wherein the power splitter further comprises a coupling, the coupling is electrically connected to the input end and coupled to the rectangular microstrip line in an electromagnetic coupling manner, so that the rectangular The microstrip line is coupled to the input terminal through the coupling element. 8 . The radio frequency device as claimed in claim 5 , wherein the at least one double L-shaped resonator is disposed between the rectangular microstrip line and the output terminal in a manner that the long sides are substantially aligned. 9. The radio frequency device as claimed in claim 5, wherein each radiating element of each antenna further comprises: a first L-shaped extension extending from the first side with the long side parallel to the first side; and A second L-shaped extension section, the second L-shaped extension section extends from the third side in such a way that the long side is parallel to the third side. 10. The radio frequency device as claimed in claim 5, wherein each extension column conducts two adjacent radiating elements among the plurality of radiating elements in an electromagnetic coupling manner.