A broadband high polarization isolation antenna and antenna array

Abstract

The application relates to a broadband high-polarization-isolation antenna and an antenna array, the antenna comprising a first antenna and a second antenna, the first antenna and the second antenna each comprising a substrate, a radiator and a feeding structure, the substrate of the first antenna being provided with a first groove with an upward opening in the axial direction, the substrate of the second antenna being provided with a second groove with a downward opening in the axial direction, the sum of the length of the first groove and the length of the second groove being the height of the first substrate, the first substrate and the second substrate being fixedly connected through the first groove and the second groove in a cross shape, the radiator being fixedly arranged on one side of the substrate, the radiator being provided with a gradually-changing opening in the radiation direction, and the two sides of the radiator each being provided with a U-shaped slit extending from the side edge to the gradually-changing opening. The first antenna and the second antenna each having the U-shaped slit are connected, so that the antenna has the performances of high gain, stable radiation and high isolation.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a wideband high polarization isolation antenna and antenna array. Background Technology

[0002] Antennas are key components in modern wireless communication systems for radiating and receiving energy. Since wireless communication devices all require antennas to transmit and receive signals, the signal transmission and reception capabilities of antennas often directly determine the performance of wireless communication systems.

[0003] To improve the capacity of communication systems, polarization diversity technology is generally employed, using wideband dual-polarized antennas to enhance antenna efficiency. One of the challenges in designing wideband dual-polarized antennas lies in controlling the mutual interference between two different polarized antennas while ensuring each antenna meets its operating characteristics. This places demands on antenna isolation and cross-polarization parameters. Improving the isolation of dual-polarized antennas is primarily achieved through a well-designed feeding method to reduce the current influence between the two feed ports. The smaller the current influence between the two ports, the greater the antenna isolation. In engineering design, the two feed lines are typically orthogonal to improve isolation. Another challenge in designing wideband dual-polarized antennas is that not only must the antenna's impedance matching bandwidth meet the wideband requirements, but its radiation characteristics must also meet the requirements within this wideband range.

[0004] Therefore, there is a need to provide a wideband, high-polarization-isolation antenna that is radiation-stable, has high isolation, and improves the low-frequency impedance bandwidth of the antenna to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a wideband, high polarization isolation antenna. It solves the technical problem in the prior art of controlling the mutual influence between two antennas with different polarizations while ensuring that each polarization antenna meets its operating characteristics, thus affecting the antenna's isolation and cross-polarization performance.

[0006] The technical effects of this invention are achieved through the following:

[0007] A broadband high polarization isolation antenna includes a first antenna and a second antenna. Both the first and second antennas include a substrate, a radiator, and a feeding structure. The substrates of the first and second antennas have the same height. The substrate of the first antenna has a first groove opening upwards along its axial direction, and the substrate of the second antenna has a second groove opening downwards along its axial direction. The sum of the lengths of the first and second grooves is the height of the first substrate. The first and second substrates are fixedly connected by the first and second grooves in a cross-shaped configuration. The radiator is fixedly disposed on one side of the substrate. The radiator has a tapered opening in its radiation direction, and the radiator is symmetrical about the axis of the tapered opening. The size of the tapered opening gradually increases in the direction of its extension. A resonant cavity is located at the bottom of the tapered opening, near the bottom of the substrate. Both sides of the radiator have U-shaped slots extending from the sides towards the tapered opening, and these U-shaped slots are symmetrically arranged about the axis of the tapered opening. The feeding structure is fixedly disposed on the other side of the substrate, near the resonant cavity, at the bottom of the substrate. By incorporating U-shaped slots on both sides of the radiator, the low-frequency impedance bandwidth of the antenna is improved without altering its size. This results in a wider bandwidth, improved gain flatness, and enhanced signal transmission and reception performance, while also facilitating antenna miniaturization. It addresses the problem in existing technologies where small antenna dimensions in the low-frequency band affect impedance matching, hindering sufficient operating bandwidth and impacting signal transmission and reception performance. The cross-connection of the first and second antennas provides the high-polarization-isolation antenna with high gain and high isolation. The symmetrical arrangement of the U-shaped slots on both sides of the radiator, with the axis of the gradually changing opening as the axis of symmetry, ensures a symmetrical radiation pattern.

[0008] Furthermore, the U-shaped gap includes a first gap and a second gap, the first gap and the second gap are parallel, the length of the second gap is less than the length of the first gap, one end of the first gap is located on the side of the radiator, and the other end of the first gap is connected to the second gap.

[0009] Furthermore, the length of the U-shaped slit is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband low standing wave antenna.

[0010] Furthermore, the feeding structure includes a right-angled feeding structure and a fan-shaped feeding structure. The right-angled feeding structure includes a first right-angled side and a second right-angled side connected to each other. The axial directions of the first right-angled side and the second right-angled side are perpendicular to each other. The first right-angled side is connected to the vertex of the fan-shaped feeding structure, and the second right-angled side is located at the bottom of the broadband low VSWR antenna for connection to the feeding port. By adding a fan-shaped feeding structure at the end of the right-angled feeding structure, the coupling with the gradient opening located on the other side of the substrate is improved, the VSWR of the antenna is reduced, which is beneficial for antenna matching and thus beneficial for electromagnetic wave radiation.

[0011] Furthermore, the second right-angled side of the right-angled feed structure is located on one side of the radiator of the second antenna. By setting the second right-angled sides of the first antenna and the second right-angled side of the second antenna to be vertically offset in space, interference between the first antenna and the second antenna at the feed port is avoided, facilitating welding and installation on the production line.

[0012] Furthermore, the axial direction of the first right-angled side is the axis of symmetry of the fan-shaped power supply structure, and the axial direction of the first right-angled side is perpendicular to the axial direction of the gradient opening.

[0013] Furthermore, the apex of the fan-shaped feed structure and the position of the gradient opening near the resonant cavity overlap in the Y direction, and the fan-shaped feed structure and the second right-angled side are respectively located on both sides of the axial direction of the gradient opening.

[0014] Furthermore, the apex angle of the fan-shaped power supply structure is 70 to 85 degrees.

[0015] Furthermore, the resonant cavity has a circular structure, and the diameter of the circular structure is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband high polarization isolation antenna.

[0016] In addition, an antenna array is provided, including the aforementioned wideband high polarization isolation antenna, wherein multiple of the wideband high polarization isolation antennas are fed together to form the antenna array.

[0017] As described above, the present invention has the following beneficial effects:

[0018] 1) By connecting the first antenna and the second antenna in a cross shape, the high polarization isolation antenna has the characteristics of high gain and high isolation.

[0019] 2) By setting the second right-angled side of the first antenna and the second right-angled side of the second antenna to be staggered vertically in space, interference between the first antenna and the second antenna at the feed port is avoided, which facilitates welding and installation on the production line.

[0020] 3) By providing U-shaped slots on both sides of the radiator, the low-frequency impedance bandwidth of the antenna is improved without changing the antenna size, giving the antenna a larger bandwidth characteristic, improving the antenna gain flatness, enhancing the antenna signal transmission and reception performance, and contributing to the miniaturization of the antenna; it solves the problem in the prior art where the low-frequency band is limited by the antenna size, and when the antenna lateral size is too small, the impedance matching in the low-frequency band is affected, resulting in insufficient operating bandwidth and affecting the antenna signal transmission and reception performance.

[0021] 4) By setting the U-shaped gaps on both sides of the radiator symmetrically with the axis of the gradually changing opening as the axis of symmetry, the symmetry of the radiation pattern is ensured.

[0022] 5) By adding a fan-shaped feeding structure at the end of the right-angled feeding structure, the coupling with the gradient opening on the other side of the substrate is improved, the standing wave ratio of the antenna is reduced, which is beneficial to the matching of the antenna and thus beneficial to the radiation of electromagnetic waves. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0024] Figure 1 This specification provides an overall structural schematic diagram of a wideband, high polarization isolation antenna as an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the first antenna on one side of the radiator, provided in an embodiment of this specification.

[0026] Figure 3 This is a schematic diagram of the first antenna on one side of the feeding structure provided in the embodiments of this specification;

[0027] Figure 4 A simulated VSWR diagram of a wideband high polarization isolation antenna provided for embodiments of this specification;

[0028] Figure 5 The simulation results show the isolation of the two feed ports of a broadband high polarization isolation antenna provided in the embodiments of this specification.

[0029] The corresponding reference numerals in the figure are as follows:

[0030] First antenna 1, second antenna 2, substrate 3, radiator 4, feed structure 5, right-angled feed structure 51, first right-angled side 511, second right-angled side 512, fan-shaped feed structure 52, gradient opening 6, waveguide region 61, radiation region 62, U-shaped slot 7, first slot 71, second slot 72, resonant cavity 8. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Example 1:

[0034] like Figure 1-3As shown, a broadband high polarization isolation antenna includes a first antenna 1 and a second antenna 2. Both the first antenna 1 and the second antenna 2 include a substrate 3, a radiator 4, and a feed structure 5. The height of the substrate 3 of the first antenna 1 is the same as the height of the substrate 3 of the second antenna 2. The substrate 3 of the first antenna 1 has a first groove with an upward opening in its axial direction, and the substrate 3 of the second antenna 2 has a second groove with a downward opening in its axial direction. The sum of the lengths of the first groove and the second groove is the height of the first substrate 3. The first substrate 3 and the second substrate 4 are fixedly connected by the first groove and the second groove in a cross shape. The radiator 4... The radiator 4 is fixedly disposed on one side of the substrate 3. It has a gradient opening 6 in the radiation direction. The radiator 4 is symmetrical about the axis of the gradient opening 6. The size of the gradient opening 6 gradually increases in the direction of opening extension. A resonant cavity 8 is provided at the bottom of the gradient opening 6. The resonant cavity 8 is located near the bottom of the substrate 3. Both sides of the radiator 4 are provided with U-shaped slits 7 extending from the side to the gradient opening 6. The U-shaped slits 7 on both sides of the radiator 4 are symmetrically arranged about the axis of the gradient opening 6. The power supply structure 5 is fixedly disposed on the other side of the substrate 3. The power supply structure 5 is located near the bottom of the substrate 3 near the resonant cavity 8.

[0035] By connecting the first antenna 1 and the second antenna 2 in a cross shape, the high polarization isolation antenna has characteristics such as high gain and high isolation.

[0036] It should be noted that the tapered opening 6 can be divided into two parts according to its function. One part is the waveguide region 61 of equal width, i.e., the slot line, and the other part is the radiation region 62 of tapered width. The waveguide region 61 is the narrow opening end, and the operating frequency band corresponding to the narrow opening end is high frequency. The radiation region 62 is the wide opening end, and the operating frequency band corresponding to the wide opening end is low frequency. For the slot line operating in the matched state, if the slot width is much smaller than half of the operating wavelength, the energy in it will be confined between the tapered openings 6 in the radiator 4 and will not be radiated out. Therefore, taking advantage of the radiation characteristic that the slot line width is much larger than half of the operating wavelength, the slot line width is gradually increased to form the radiation region 62 to radiate electromagnetic waves outward or receive them inward.

[0037] Since the lateral dimension of the antenna should be more than half a wavelength of the lowest frequency, the lateral dimension of the antenna determines the low-frequency impedance bandwidth. By providing U-shaped slots 7 on both sides of the radiator 4, the low-frequency impedance bandwidth of the antenna is increased without changing the antenna size, giving the antenna a larger bandwidth characteristic, improving the antenna gain flatness, and enhancing the antenna signal transmission and reception performance.

[0038] Specifically, the radiator 4 has U-shaped slots 7 on both the left and right sides that extend from the sides to the gradually changing opening 6 in a manner symmetrical about the central axis of the antenna. This ensures the consistency of the current distribution and the symmetry of the radiation pattern in the antenna, thereby improving the radiation performance of the antenna.

[0039] Specifically, the substrate 3 is a dielectric plate, made of materials such as phenolic resin, epoxy resin or polytetrafluoroethylene, preferably FR4 material. The radiator 4 can be a metal plating layer on one side of the dielectric plate, or it can be a metal plate directly. The metal material is preferably copper.

[0040] Specifically, the right-angled feed structure 51 of the feed structure 5 is located at the bottom of the antenna, which facilitates connection with the SMA connector or other connectors and makes assembly easier; and compared with setting it on the side of the antenna, it is more conducive to saving space and reducing the coupling between antennas.

[0041] Preferably, the U-shaped gap 7 includes a first gap 71 and a second gap 72, the first gap 71 and the second gap 72 are parallel, the length of the second gap 72 is less than the length of the first gap 71, one end of the first gap 71 is located on the side of the radiator 4, and the other end of the first gap 71 is connected to the second gap 72.

[0042] Preferably, the length of the U-shaped slit 7 is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband low standing wave antenna.

[0043] Specifically, such as Figure 1-3 As shown, the first antenna 1 and the second antenna 2 have the same dimensions. The two antennas have a lateral dimension of 62 mm and a longitudinal dimension of 64 mm. The length of the U-shaped slot 7 is 30-35 mm. The lateral dimension of the antenna is the length of the antenna, with the length direction being the X direction. The longitudinal dimension of the antenna is the height of the antenna, with the height direction being the Z direction. The Y direction is perpendicular to both the X and Z directions, that is, perpendicular to the plane of the substrate 3.

[0044] Preferably, the feeding structure 5 includes a right-angled feeding structure 51 and a fan-shaped feeding structure 52. The right-angled feeding structure 51 includes a first right-angled side 511 and a second right-angled side 512 connected to each other. The axial direction of the first right-angled side 511 and the axial direction of the second right-angled side 512 are perpendicular to each other. The first right-angled side 511 and the vertex of the fan-shaped feeding structure 52 are connected. The second right-angled side 512 is located at the bottom of the broadband low VSWR antenna for connection with the feeding port. By adding a fan-shaped feeding structure 52 at the end of the right-angled feeding structure 51, the coupling with the gradient opening 6 located on the other side of the substrate 3 is improved, the VSWR of the antenna is reduced, which is beneficial for antenna matching and thus beneficial for electromagnetic wave radiation.

[0045] Specifically, the power supply structure 5 can use a metal plating layer on one side of the dielectric substrate, or it can be a metal plate directly, with copper being the preferred metal material.

[0046] Specifically, the first right-angled side 511 is located in the horizontal direction, and the second right-angled side 512 is located in the vertical direction.

[0047] Preferably, the second right-angled side 512 of the right-angled feed structure 51 is located on one side of the radiator 4 of the second antenna 2. By setting the second right-angled side 512 of the first antenna 1 and the second right-angled side 512 of the second antenna 2 to be staggered vertically in space, interference between the first antenna 1 and the second antenna 2 at the feed port is avoided, which facilitates welding and installation on the production line.

[0048] Preferably, the axial direction of the first right-angled side 511 is the axis of symmetry of the fan-shaped power supply structure 52, and the axial direction of the first right-angled side 511 is perpendicular to the axial direction of the gradient opening 6.

[0049] Preferably, the apex of the fan-shaped feeding structure 52 and the position of the gradient opening 6 near the resonant cavity 8 overlap in the Y direction, and the fan-shaped feeding structure 52 and the second right-angled side 512 are located on both sides of the axial direction of the gradient opening 6, respectively.

[0050] Preferably, the apex angle of the fan-shaped power supply structure 52 is 70 to 85 degrees.

[0051] Specifically, the radius of the fan-shaped power supply structure 52 is 4 to 5 mm, preferably 4.5 mm.

[0052] Preferably, the resonant cavity 8 is a circular structure, and the diameter of the circular structure is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband high polarization isolation antenna.

[0053] Specifically, the distance from the nearest point on the wall of the resonant cavity 8 to the edge of the fan-shaped feeding structure 52 adjacent to the resonant cavity 8 is 1 to 3 mm.

[0054] In this embodiment, a wideband high polarization isolation antenna designed based on the concept of this invention is established. A model corresponding to the wideband high polarization isolation antenna of this application is established and the model is simulated. Figure 3 As shown, the simulation results of the standing wave ratio (VSWR) of the broadband low standing wave antenna of this application are obtained.

[0055] Figure 3 The simulation results of the standing wave ratio (VSWR) show that the wideband low VSWR antenna in this application achieves a VSWR of <1.7 in the ultra-wideband frequency range of 1.7GHz-6GHz. This increases the low-frequency impedance bandwidth of the antenna without changing its size, giving the antenna a larger bandwidth characteristic and improving the performance of the antenna signal transmission and reception. This solves the problem in the prior art where the low-frequency band is limited by the antenna size, and when the antenna's lateral size is too small, the impedance matching in the low-frequency band is affected, resulting in insufficient operating bandwidth and affecting the antenna signal transmission and reception performance.

[0056] Furthermore, based on the ideas of this invention, simulation results of the isolation between the two feed ports of a broadband high polarization isolation antenna are provided for reference. Figure 4As shown in the figure, the simulation results show that the isolation is less than -28dB across the entire frequency band from 1.7GHz to 6GHz, achieving high isolation characteristics for the antenna.

[0057] Example 2:

[0058] An antenna array includes the wideband high polarization isolation antenna of embodiment 1. Multiple wideband high polarization isolation antennas are fed together to form an antenna array, which has the advantages of high gain, stable radiation and high isolation.

[0059] As described above, the present invention has the following beneficial effects:

[0060] 1) By connecting the first antenna and the second antenna in a cross shape, the high polarization isolation antenna has the characteristics of high gain and high isolation.

[0061] 2) By setting the second right-angled side of the first antenna and the second right-angled side of the second antenna to be staggered vertically in space, interference between the first antenna and the second antenna at the feed port is avoided, which facilitates welding and installation on the production line.

[0062] 3) By providing U-shaped slots on both sides of the radiator, the low-frequency impedance bandwidth of the antenna is improved without changing the antenna size, giving the antenna a larger bandwidth characteristic, improving the antenna gain flatness, enhancing the antenna signal transmission and reception performance, and contributing to the miniaturization of the antenna; it solves the problem in the prior art where the low-frequency band is limited by the antenna size, and when the antenna lateral size is too small, the impedance matching in the low-frequency band is affected, resulting in insufficient operating bandwidth and affecting the antenna signal transmission and reception performance.

[0063] 4) By setting the U-shaped gaps on both sides of the radiator symmetrically with the axis of the gradually changing opening as the axis of symmetry, the symmetry of the radiation pattern is ensured.

[0064] 5) By adding a fan-shaped feeding structure at the end of the right-angled feeding structure, the coupling with the gradient opening on the other side of the substrate is improved, the standing wave ratio of the antenna is reduced, which is beneficial to the matching of the antenna and thus beneficial to the radiation of electromagnetic waves.

[0065] While the present invention has been described through preferred embodiments, it is not limited to the embodiments described herein, and various changes and modifications are made without departing from the scope of the invention.

[0066] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0067] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0068] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A wideband, high polarization isolation antenna, characterized in that, The system includes a first antenna (1) and a second antenna (2). Both the first antenna (1) and the second antenna (2) include a substrate (3), a radiator (4), and a feeding structure (5). The height of the substrate (3) of the first antenna (1) is the same as the height of the substrate (3) of the second antenna (2). The substrate (3) of the first antenna (1) has a first groove with an upward opening in the axial direction, and the substrate (3) of the second antenna (2) has a second groove with a downward opening in the axial direction. The sum of the lengths of the first groove and the second groove is the height of the substrate (3) of the first antenna (1). The substrate (3) of the first antenna (1) and the substrate (3) of the second antenna (2) are fixedly connected by the first groove and the second groove in a cross-shaped manner. The radiator (4) is fixedly mounted on the substrate. On one side of the substrate (3), the radiator (4) has a gradient opening (6) in the radiation direction. The radiator (4) is symmetrical about the axis of the gradient opening (6). The size of the gradient opening (6) gradually increases in the direction of opening extension. A resonant cavity (8) is provided at the bottom of the gradient opening (6). The resonant cavity (8) is located near the bottom of the substrate (3). Both sides of the radiator (4) have U-shaped slits (7) extending from the side to the gradient opening (6). The U-shaped slits (7) on both sides of the radiator (4) are symmetrically arranged about the axis of the gradient opening (6). The power supply structure (5) is fixed on the other side of the substrate (3). The power supply structure (5) is located near the bottom of the substrate (3) near the resonant cavity (8). The U-shaped slit (7) includes a first slit (71) and a second slit (72). The first slit (71) and the second slit (72) are parallel. The length of the second slit (72) is less than the length of the first slit (71). One end of the first slit (71) is located on the side of the radiator (4), and the other end of the first slit (71) is connected to the second slit (72). The feeding structure (5) includes a right-angled feeding structure (51) and a fan-shaped feeding structure (52). The right-angled feeding structure (51) includes a first right-angled side (511) and a second right-angled side (512) connected to each other. When the first antenna (1) and the second antenna (2) are cross-connected, the second right-angled side (512) of the right-angled feeding structure (51) of the first antenna (1) is located on one side of the radiator (4) of the second antenna (2).

2. The wideband high polarization isolation antenna according to claim 1, characterized in that, The length of the U-shaped slit (7) is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband low standing wave antenna.

3. The wideband high polarization isolation antenna according to claim 1, characterized in that, The axis of the first right-angled side (511) and the axis of the second right-angled side (512) are perpendicular to each other. The first right-angled side (511) is connected to the vertex of the fan-shaped feed structure (52). The second right-angled side (512) is located at the bottom of the broadband high polarization isolation antenna for connection with the feed port.

4. The wideband high polarization isolation antenna according to claim 1, characterized in that, The first right-angled side (511) is axially aligned with the axis of symmetry of the fan-shaped power supply structure (52), and the axis of the first right-angled side (511) is perpendicular to the axis of the gradient opening (6).

5. The wideband high polarization isolation antenna according to claim 4, characterized in that, The apex of the fan-shaped power supply structure (52) and the position of the gradient opening (6) near the resonant cavity (8) overlap in the Y direction. The fan-shaped power supply structure (52) and the second right-angled side (512) are located on both sides of the axial direction of the gradient opening (6), and the Y direction is the direction perpendicular to the plane of the substrate (3).

6. The wideband high polarization isolation antenna according to claim 1, characterized in that, The apex angle of the fan-shaped power supply structure (52) is 70 to 85 degrees.

7. The wideband high polarization isolation antenna according to claim 1, characterized in that, The resonant cavity (8) is a circular structure, and the diameter of the circular structure is 1 / 4 of the wavelength of the electromagnetic wave emitted by the broadband high polarization isolation antenna.

8. An antenna array, characterized in that, It includes a plurality of wideband high polarization isolation antennas as described in any one of claims 1-7, wherein the plurality of wideband high polarization isolation antennas are fed together to form the antenna array.

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