WO2019184008A1

WO2019184008A1 - Broadband nine-beam array antenna

Info

Publication number: WO2019184008A1
Application number: PCT/CN2018/082696
Authority: WO
Inventors: 吴泽海; 吴壁群; 苏振华; 林仙岳; 叶亮华; 孙丹; 邓佑昌
Original assignee: 广东博纬通信科技有限公司
Priority date: 2018-03-29
Filing date: 2018-04-11
Publication date: 2019-10-03

Abstract

The present invention relates to the technical field of communications antennas, and specifically relates to a broadband nine-beam array antenna. The present invention comprises a metal reflective panel, a radiating element array, a beamforming network, a first power divider network, a second power divider network, and a phase compensation circuit; said radiating element array is connected to the second power divider network and fixedly mounted on the metal reflective panel; said beamforming network is connected to said first power divider network by means of said phase compensation circuit and is fixedly mounted on the metal reflective plate. The invention has better side lobe and grating lobe suppression performance in an ultra-wide frequency band, reducing the adjacent-cell interference of a cell corresponding to the beam. In comparison with a five-beam antenna, the nine-beam antenna of the present invention achieves more cell splitting in the same spatial range, and achieves more frequency reuse of adjacent cells without increasing the number of antenna sites, thus further increasing network capacity.

Description

Broadband nine beam array antenna

Technical field

The present invention relates to the field of communication antenna technologies, and in particular, to a broadband nine-beam array antenna.

Background technique

After the fourth-generation mobile communication technology is commercialized on the scale of 4G/LTE, the data traffic in the mobile communication network is proliferating, and the bandwidth capacity of the mobile communication system in the user-intensive area is under tremendous pressure. For the problem of limited capacity of a single cell, using a multi-beam antenna, the coverage area of a conventional single sector can be subdivided into multiple sectors, and the capacity of the wireless channel is multiplied. The invention patent publication CN 102570057 A proposes a method of generating five beams using a 6 x 6 Butler matrix, as shown in FIG. Each column of evenly arranged radiating elements is connected to a vertical splitter and then to a 6 x 6 Butler matrix output, each polarization corresponding to a 6 x 6 Butler matrix. However, the working bandwidth of this technology is only 23.7% (1710-2170MHz), which cannot be compatible with the 2300 and 2600MHz bands of 4G LTE. If the frequency band is widened to the 1700-2700MHz band, the azimuth 2700MHz frequency will generate a very high grating lobe about -5dB. The interference to neighboring cells is very large. Patent 201621038190.7 utilizes a horizontally staggered arrangement of radiating elements to achieve better grating lobe suppression.

Sports venues gather tens of thousands or even 100,000 mobile communication users at the opening ceremony of the Olympic Games. The use of five beams for cell division is still insufficient to cope with the increasing traffic demand. Therefore, in order to further increase the capacity, it is necessary to design a base station antenna with more beams, and the working frequency band is widened to 1427-2700 MHz, which is compatible with the current mobile communication 4G/3G standard frequency band and the 2G standard frequency band, and reserves the need for future upgrades, and works. The azimuthal direction in the frequency band has good side lobe and grating lobe suppression performance to overcome the above problems.

Summary of the invention

In order to overcome the shortcomings of the above prior art, it is necessary to provide a higher-capacity wide-band nine-beam array antenna for some special scene network coverage, such as a stadium and a performing arts center with very dense mobile communication. The invention provides a broadband nine-beam array antenna, comprising a metal reflector, a radiation unit array, a beamforming network, a first power divider network, a second power divider network and a phase compensation circuit;

The radiation unit array is connected to the second power divider network and fixedly mounted on the metal reflective board, and the beam forming network is connected to the first power divider network through the phase compensation circuit, and is fixed Mounted on the metal reflective plate;

The radiation unit array includes two or more radiation unit groups, each of the radiation unit groups is arranged in a horizontal direction, and at least one radiation unit group is offset in a horizontal direction;

The radiation unit group includes 12 or more radiation units;

The beamforming network is at least two, each of the beamforming networks comprising a 12-way Butler matrix circuit and a 2-way power splitter group;

The phase compensation circuit has at least eight, and each of the phase compensation circuits includes two independent transmission lines.

Further, the number of the radiation unit groups is six, and the radiation unit is a dual polarization antenna unit.

Further, adjacent rows of the array of radiating elements are offset in a horizontal direction on the arrangement.

Further, the first power divider network includes at least eight 2-way power divider circuits, and an input port of the first power divider network is an input port of an antenna;

The second power splitter network includes at least 24 3-way splitter circuits; the output ports of the 3-way splitter circuit are connected to three radiating elements at different horizontal positions in the same horizontal position, and the three-way power splitting An input port of the circuit is coupled to an output port of the beam forming network.

Further, each of the 12-channel Butler matrix circuits includes four 3×3 Butler matrix circuits, three 4×4 Butler matrix circuits, and nine phase shifters; a 3×3 Butler matrix circuit and 4× 4 Butler matrix circuits are cross-connected by phase shifters.

Further, each of the 12-channel Butler matrix circuits includes 12 isolated input ports and 12 isolated output ports, wherein three input ports are connected to a 50 ohm load and grounded, and the remaining input ports serve as beamforming networks. 9 input ports, respectively, a first input port, a second input port, a third input port, a fourth input port, a fifth input port, a sixth input port, a seventh input port, an eighth input port, and a ninth The input ports correspond to the first beam, the second beam, the third beam, the fourth beam, the fifth beam, the sixth beam, the seventh beam, the eighth beam, and the ninth beam, respectively.

Further, the azimuth angle of the first beam ranges from 25 to 50 degrees, the azimuth angle of the second beam ranges from 18 to 35 degrees, and the azimuth angle of the third beam ranges from 10 to 25 degrees. The fourth beam has an azimuth angle ranging from 5 to 15 degrees, the fifth beam has an azimuth angle of 0 degrees, and the sixth beam has an azimuth angle ranging from -5 to -15 degrees, the azimuth of the seventh beam The range is -10 to -25 degrees, the azimuth of the eighth beam ranges from -18 to -35 degrees, and the azimuth of the ninth beam ranges from -25 to -50 degrees.

Further, the two independent transmission lines have a phase difference ranging from 0 degrees to 90 degrees.

Further, the radiating elements in the radiation unit group have the same horizontal spacing, and the vertical spacing between the radiation unit groups is equal;

The spacing is 0.4 to 0.95 times the wavelength of the center frequency of the working frequency band of the array antenna;

The horizontal offset distance of each row of radiating elements is half of the horizontal distance of the radiating elements.

Further, the first input port, the second input port, the third input port, the fourth input port, the sixth input port, the seventh input port, the eighth input port, and the ninth input port of the beam forming network pass through The phase compensation circuit is connected to the first power divider network.

Further, the antenna operating frequency band is 1427-2700 MHz.

Compared with the prior art, the present invention has the following beneficial effects:

The invention provides a broadband nine-beam array antenna, each radiation unit group comprises a plurality of radiation units arranged in a horizontal direction, at least one radiation unit group is offset in a horizontal direction, and a plurality of phase compensation circuits are horizontally biased. The shifted radiation unit group performs phase compensation, so that the radiation units of different rows are arranged in a horizontal direction according to a certain regularity, and a certain phase compensation is added to the offset radiation unit in the feeding network, and the nine beam antennas are The ultra-wide frequency band has better sidelobe and grating lobe suppression performance, and reduces the neighboring interference of the beam corresponding cell. At the same time, a 12-channel Butler matrix circuit is used to realize a beamforming network that can generate nine beams in the azimuth direction. Compared with the five-beam antenna, the nine-beam antenna of the present invention realizes more cell splitting in the same spatial range. The frequency reuse of more neighboring cells is realized without increasing the antenna site, and the network capacity is further improved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained according to these drawings without any creative work;

1 is a radiation unit arrangement scheme of a broadband nine-beam antenna of the present invention;

2 is a radiation unit arrangement scheme of a prior art generating a five-beam antenna;

3 is a connection diagram of a radiation unit and a 3-way power divider circuit of the present invention;

4 is a connection diagram of a beamforming network of the present invention;

5 is an internal structure diagram of a beam forming network according to the present invention, wherein FIG. a is a schematic diagram of a 2-way power divider circuit, and FIG. b is a schematic diagram of a cross-connection of a Butler matrix circuit and a phase shifter;

6 is a structural diagram of a 3×3 Butler matrix circuit of a beamforming network;

Figure 7 is a 4×4 Butler matrix circuit structure diagram of a beamforming network.

8 is a connection diagram of a second power divider network and a phase compensation circuit according to the present invention, wherein FIG. a is a first beam to a fifth beam connection diagram, and FIG. b is a sixth beam to a ninth beam connection diagram;

9 is a schematic diagram of a synthetic azimuth plane of a 1710 MHz frequency measured by an embodiment of the present invention;

FIG. 10 is a schematic diagram showing a synthesized azimuth plane of nine beams at a frequency of 2690 MHz measured according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be described in detail below with reference to the specific embodiments of the invention. And efficacy. The present invention may be embodied or applied in various other specific embodiments, and various modifications and changes may be made without departing from the spirit and scope of the invention.

The present invention provides a broadband nine-beam array antenna, which specifically includes a metal reflector, a radiation unit array, a beamforming network, a first power divider network, a second power divider network, and a phase compensation circuit;

The radiation unit group includes 12 or more radiation units;

The radiation unit group is six, and the radiation unit is a dual polarization antenna unit.

Adjacent rows of the array of radiating elements are offset in a horizontal direction on the arrangement.

Specifically, adjacent rows of the array of radiating elements are offset in a horizontal direction on the arrangement, as shown in FIG. The plurality of radiating elements 101 are arranged in a row to form a radiating unit group 111. The horizontal spacing of the radiating elements is HD, the vertical spacing is VD, and the distance horizontally staggered by adjacent rows is HD1. Preferably, the number of radiating elements per row is N=20 and the horizontal spacing is equal, the number of rows M=6 and the vertical spacing of adjacent rows are equal; preferably, the second row of radiating element groups 112, the fourth row of radiating element groups 114, And the sixth row of radiation unit groups 116 are both right offset HD1 with respect to the first row 111; the third row of radiation unit groups 113 and the fifth row of radiation unit groups 115 are not offset with respect to the first row 111. Preferably, the radiating element 101 is a ±45 dual-polarized crossed dipole antenna, a patch antenna and a slot antenna.

In the embodiment of the present invention, the first power divider network includes at least eight 2-way power splitter circuits, and an input port of the first power splitter network is an input port of an antenna; and the second power splitter The network includes at least 24 3-way splitter circuits; the output ports of the 3-way splitter circuit are connected to three radiating elements at different horizontal positions of the same horizontal position, and the input ports of the 3-way splitter circuit are connected The output port of the beamforming network.

In the embodiment of the present invention, each of the 12-channel Butler matrix circuits includes four 3×3 Butler matrix circuits, three 4×4 Butler matrix circuits, and nine phase shifters; and a 3×3 Butler matrix. The circuit and the 4 x 4 Butler matrix circuit are cross-connected by a phase shifter. Each of the 12-channel Butler matrix circuits includes 12 isolated input ports and 12 isolated output ports, of which 3 input ports are connected to a 50 ohm load and grounded, and the remaining input ports serve as 9 beam forming networks. Input ports, which are a first input port, a second input port, a third input port, a fourth input port, a fifth input port, a sixth input port, a seventh input port, an eighth input port, and a ninth input port, respectively And corresponding to the first beam, the second beam, the third beam, the fourth beam, the fifth beam, the sixth beam, the seventh beam, the eighth beam, and the ninth beam, respectively.

Preferably, the azimuth of the first beam ranges from 25 to 50 degrees, the azimuth of the second beam ranges from 18 to 35 degrees, and the azimuth of the third beam ranges from 10 to 25 degrees. The azimuth angle of the fourth beam ranges from 5 to 15 degrees, the azimuth angle of the fifth beam is 0 degrees, and the azimuth angle of the sixth beam ranges from -5 to -15 degrees, the orientation of the seventh beam The angular range is -10 to -25 degrees, the azimuth angle of the eighth beam ranges from -18 to -35 degrees, and the azimuth angle of the ninth beam ranges from -25 to -50 degrees.

The two independent transmission lines have a phase difference ranging from 0 degrees to 90 degrees.

The horizontal spacing of the radiating elements in the group of radiating elements is equal, and the vertical spacing between the groups of radiating elements is equal;

That is to say, the radiation unit of each row is connected to the output port of the second power divider network, and the second power divider network is composed of a plurality of 3-way power divider circuits, and the number of the three-way power divider circuits is 80. Three radiating elements of the same horizontal position in each column of the array are connected to the output port of the same 3-way splitter circuit, and one of the polarized connections is shown in FIG. The first row of radiating elements are connected as follows. The +45 polarization of the radiating elements d(1,1), d(3,1) and d(5,1) is connected to the output port of the 3-way splitter circuit 201, and the radiating element d ( The +45 polarization of 2,1), d(4,1) and d(6,1) is connected to the output port of the other 3-way power divider circuit 221. The other column radiating elements are similar to the three-way splitter circuit. Figure 3 shows the +45 polarization connection of the radiating element, and the -45 polarization connection is similar.

Preferably, the input port of the 3-way splitter circuit is connected to the output port of the beam forming network, as shown in FIG. The input port of the 3-way splitter circuit connecting the radiating elements of the 1, 3, and 5 rows is connected to the output port of the beam forming network 302; the input port of the 3-way splitter circuit connecting the radiating elements of the 2nd, 4th, and 6th rows is connected. The output port of the beamforming network 301. The beamforming network contains nine input ports, the number of output ports being equal to the number of columns of the array N=20. Figure 4 shows a +45 polarization connection diagram with a -45 polarization connection similar. The dual-polarized broadband nine-beam antenna comprises four beamforming networks.

As shown in Figure a and Figure b of Figure 5, each beamforming network comprises a 2-way splitter circuit group 315, a 3 x 3 Butler Matrix circuit set (314-1 to 314-4), 4 x 4 Bart A matrix circuit group (313-1 to 313-3), and nine phase shifters 312. One input port of the 4×4 Butler matrix circuit is connected to the 50 resistor and grounded. The 2-way splitter circuit group includes eight 2-way splitters that function to form a cone-shaped distribution of the amplitude of the excitation signal of the horizontal radiating elements of the array to suppress the near-side lobes and the control beam crossing levels. Each of the 3 x 3 Butler matrix circuits includes three 90 degree mixers 312 and three phase shifters 311, as shown in FIG. Each of the 4 x 4 Butler matrix circuits includes four 90 degree mixers 312 and two 45 degree phase shifters 311, as shown in FIG. The output port of the 4×4 Butler Matrix circuit group is cross-connected with the input port of the 3×3 Butler Matrix circuit group through the phase shifter 311, part of the output port of the 3×3 Butler matrix circuit and the 2-way power splitter input port. Connected. The 9 input ports (411 to 419) of the 4×4 Butler matrix circuit group are input ports of the beamforming network, respectively corresponding to 9 different beam directions; the output ports of the 2-way splitter circuit group and The output port of the 3×3 Butler matrix circuit that is not connected to the 2-way splitter is the output port of the beamforming network, and is connected to the input port of the 3-way splitter circuit of the second splitter network.

The first input port, the second input port, the third input port, the fourth input port, the sixth input port, the seventh input port, the eighth input port, and the ninth input port of the beam forming network pass the phase compensation The circuit is connected to the first power divider network.

Preferably, the input port of the beamforming network is connected to the first power divider network by a phase compensation circuit, as shown in Figures a and b of Figure 8. The first power splitter network is composed of 16 2-way splitter circuits. The phase compensation circuit includes two independent transmission lines with a phase difference of φ therebetween. The

input ports

411, 421 of the first beam of the two beamforming networks are connected to the 2-way splitter circuit 501 via the phase compensation circuit 401, and the

input ports

412, 422 of the second beam are connected to the 2-way splitter via the phase compensation circuit 402. The circuit 502, the

input port

413, 423 of the third beam is connected to the 2-way power divider circuit 503 via the phase compensation circuit 403, the

input port

414, 424 of the fourth beam is connected to the 2-way power divider circuit 504 via the phase compensation circuit 404; The

input ports

416, 426 of the sixth beam are connected to the 2-way splitter circuit 506 via the phase compensation circuit 406; the

input ports

417, 427 of the seventh beam are connected to the 2-way splitter circuit 507 via the phase compensation circuit 407; The

beam input ports

418, 428 are coupled to a 2-way splitter circuit 508 via a phase compensation circuit 408; the ninth

beam input ports

419, 429 are coupled to a 2-way splitter circuit 509 via a phase compensation circuit 409. The

input ports

415, 425 of the fifth beam are directly connected to the 2-way splitter circuit 508. The -45 polarization connection is similar.

Preferably, the horizontal offset distance HD1 of each row of radiating elements is half of the horizontal distance of the radiating elements, that is, HD1=HD/2, and the phase difference circuit corresponding to the first and ninth beams has a phase difference of 60 degrees, the second and the The phase difference of the phase compensation circuit corresponding to the eight beams is 45 degrees, the phase difference of the phase compensation circuit corresponding to the third and seventh beams is 30 degrees, and the phase difference of the phase compensation circuit corresponding to the fourth and sixth beams is 15 degrees. The fifth beam does not need to be connected to the phase compensation circuit.

In the embodiment of the present invention, preferably, the number of radiation unit groups is M=6, the number of radiation units in each radiation unit group is N=20, and the number of beam forming networks is four. The antenna consists of 20 3-way splitter groups, and each 3-way splitter group contains four 3-way splitters, which is the best.

In the embodiment of the present invention, the working frequency band of the antenna is 1427-2700 MHz. Preferably, the broadband nine-beam array antenna has a working frequency band of 1427-2700 MHz, a radiating element spacing of 80 mm, a vertical plane spacing of 110 mm, and an adjacent row offset distance of 40 mm, and each row of radiating elements is set to have a phase difference of 6 degrees. inclination. The array antenna forms nine beams on the azimuth plane, and each beam has a vertical plane inclination of 6 degrees. Figure 9 is a test synthesis pattern of nine beams of azimuth plane at 1700MHz frequency point, and a test synthesis pattern of nine beams of azimuth plane at 10700MHz frequency point. It can be seen that the 9 beam crossover levels of the azimuth plane are at -10 dB, the side lobes and the grating lobe level are both better than 16 dB, and the interference is small, which can maximize the capacity.

The nine-beam antenna of the embodiment has a fixed electronic downtilt angle and is suitable for users with very dense scenes, such as large stadiums, performing arts centers and plazas. By using multiple nine-beam antennas, by performing fine cell division on application scenarios such as venues, the communication capacity can be increased several times. Compared with the conventional conventional base station antenna with a beam width of 65 degrees, not only the capacity is increased by cell splitting, but also the ultra-wideband (relative bandwidth is greater than 60%) has a lower azimuth side lobes, and the neighborhood interference of the cell is small, the network The rate is high. The traditional nine-sector division requires nine narrow-beam antennas, each of which is very large and difficult to install on the antenna tower. In this embodiment, only one antenna is needed for nine sectors, which can be conveniently configured in the antenna tower. on.

It should be emphasized that in the above embodiment, the spacing between two adjacent radiating elements in the horizontal direction in the antenna array is fixed, that is, the radiating elements are equally spaced. However, in practical engineering applications, the vibrator units can also be arranged at unequal intervals. Similarly, the two vibrators in the vertical direction may also be arranged at unequal intervals. In the embodiment, the 2nd, 4th, and 6th rows are right-shifted with respect to the 1st, 3rd, and 5th rows, and may be left-shifted in practical applications. In the case where the arrangement of the vibrators is staggered, it is also possible to realize a multi-beam pattern having a low side lobe in the ultra-wideband range, and it is also within the scope of the present invention without departing from the concept of the present invention.

In the above-mentioned broadband nine-beam array antenna, each of the radiation unit groups includes N radiation units arranged in a horizontal direction, a plurality of radiation unit groups are offset in a horizontal direction, and a plurality of phase compensation circuits are performed on the horizontally offset radiation unit group. Phase compensation, such that different rows of radiating elements are arranged in a horizontal direction according to a certain regularity, and a certain phase compensation is added to the offset radiating elements in the feeding network, and the nine beam antennas have an ultra-wide frequency band. The better sidelobe and grating lobe suppression performance reduces the neighboring interference of the corresponding cell of the beam, and realizes frequency reuse of the adjacent cell without increasing the antenna site and the surface resources, thereby improving the network capacity.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. It is obvious that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. . Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust the implementation of this. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A wide-band nine-beam array antenna, comprising: a metal reflector, a radiation unit array, a beamforming network, a first power divider network, a second power divider network, and a phase compensation circuit;

The radiation unit array is connected to the second power divider network and fixedly mounted on the metal reflective board, and the beam forming network is connected to the first power divider network through the phase compensation circuit, and is fixed Mounted on the metal reflective plate;

The radiation unit array includes two or more radiation unit groups, each of the radiation unit groups is arranged in a horizontal direction, and at least one radiation unit group is offset in a horizontal direction;

The radiation unit group includes 12 or more radiation units;

The beamforming network is at least two, each of the beamforming networks comprising a 12-way Butler matrix circuit and a 2-way power splitter group;

The phase compensation circuit has at least eight, and each of the phase compensation circuits includes two independent transmission lines.
The broadband nine-beam array antenna according to claim 1, wherein the radiation unit group is six, and the radiation unit is a dual-polarized antenna unit.
A broadband nine-beam array antenna according to claim 1, wherein adjacent rows of said array of radiating elements are horizontally offset in arrangement.
The broadband nine-beam array antenna according to claim 1, wherein the first power divider network comprises at least eight 2-way power divider circuits, and an input port of the first power divider network is an antenna Input port;

The second power splitter network includes at least 24 3-way splitter circuits; the output ports of the 3-way splitter circuit are connected to three radiating elements at different horizontal positions in the same horizontal position, and the three-way power splitting An input port of the circuit is coupled to an output port of the beam forming network.
A broadband nine-beam array antenna according to claim 1, wherein each of said 12-channel Butler matrix circuits comprises four 3 x 3 Butler matrix circuits, three 4 x 4 Butler matrix circuits, and nine Phase shifters; 3×3 Butler matrix circuits and 4×4 Butler matrix circuits are cross-connected by phase shifters.
A broadband nine-beam array antenna according to claim 5, wherein each of said 12-way Butler matrix circuits comprises 12 isolated input ports and 12 isolated output ports, of which 3 inputs The port is connected to a 50 ohm load and grounded, and the remaining input ports serve as nine input ports of the beam forming network, namely a first input port, a second input port, a third input port, a fourth input port, a fifth input port, and a sixth An input port, a seventh input port, an eighth input port, and a ninth input port, and respectively corresponding to the first beam, the second beam, the third beam, the fourth beam, the fifth beam, the sixth beam, the seventh beam, and the first Eight beams and ninth beam.
The broadband nine-beam array antenna according to claim 6, wherein the first beam has an azimuth angle ranging from 25 to 50 degrees, and the second beam has an azimuth angle ranging from 18 to 35 degrees. The azimuth of the third beam ranges from 10 to 25 degrees, the azimuth of the fourth beam ranges from 5 to 15 degrees, the azimuth of the fifth beam is 0 degrees, and the azimuth range of the sixth beam is -5 to -15 degrees, the azimuth angle of the seventh beam is -10 to -25 degrees, the azimuth angle of the eighth beam is -18 to -35 degrees, and the azimuth range of the ninth beam It is -25 to -50 degrees.
The broadband nine-beam array antenna according to claim 1, wherein the two independent transmission lines have a phase difference ranging from 0 degrees to 90 degrees.
A broadband nine-beam array antenna according to claim 1, wherein said radiating elements in said radiating element group have equal horizontal intervals, and said vertical spacing between said radiating element groups is equal;

The spacing is 0.4 to 0.95 times the wavelength of the center frequency of the working frequency band of the array antenna;

The horizontal offset distance of each row of radiating elements is half of the horizontal distance of the radiating elements.
The broadband nine-beam array antenna according to claim 1, wherein the first input port, the second input port, the third input port, the fourth input port, and the sixth input port of the beam forming network The seventh input port, the eighth input port, and the ninth input port are connected to the first power divider network through the phase compensation circuit.
A wideband nine-beam array antenna according to claim 1, wherein said antenna operating frequency band is 1427-2700 MHz.