Ku / Ka co-aperture phased array antenna system

Abstract

This invention discloses a Ku / Ka co-aperture phased array antenna system, relating to the field of microwave / millimeter-wave antenna technology. It includes a Ku / Ka co-aperture antenna array, an antenna adapter board, and an RF connector. The array integrates two frequency bands into the same aperture, with the Ka-band antenna located on the upper layer and fed via patch coupling, and the Ku-band antenna located on the lower layer and fed via slot coupling. The adapter board integrates an adapter stripline, beam control circuitry, and a Ku / Ka dual-band power divider network. The array and adapter board are vertically interconnected via the RF connector. This invention employs a high- and low-frequency heterogeneous stacked architecture and a high-density interconnect design, effectively avoiding electromagnetic interference. While significantly reducing the antenna size, it achieves wide-range, grating-lobe-free beam scanning and flexible multi-polarization switching across both frequency bands, offering significant advantages such as compact structure, high integration, and light weight.

Description

Technical Field

[0001] This invention relates to the field of microwave / millimeter-wave antenna technology, specifically to a Ku / Ka co-aperture phased array antenna system. Background Technology

[0002] The statements in this section are provided only as background information in relation to this disclosure and may not constitute prior art.

[0003] Currently, the mainstream operating frequency bands for millimeter-wave satellite communication are the Ku and Ka bands. In order to meet the increasingly diverse needs for high-speed and broadband communication, many application scenarios (such as airborne, vehicle-mounted, and shipborne) require the simultaneous use of Ku and Ka band satellite resources.

[0004] Currently, most Ku / Ka millimeter-wave satellite communication phased array antenna systems employ a "separate aperture" design, meaning that antennas for different frequency bands and functions (transmit / receive) are physically placed separately. While the separated aperture millimeter-wave satellite communication phased array antenna technology is mature, reliable, and has a lower array density, its inherent physical limitations are becoming increasingly apparent as equipment demands greater platform space and stealth performance. The main technical problems include: 1. Large size and excessive weight: The phased array antenna with a split aperture design has a large overall size, which leads to a significant increase in the total weight of the antenna system. This will consume extremely valuable installation resources of the aircraft or vehicle (such as payload weight and skin area).

[0005] 2. Difficulty in meeting full-duplex multi-frequency communication requirements with limited aperture: In specific application areas (such as airborne satellite communication), the antenna radiation aperture is strictly limited. If a split aperture is used, it will be difficult to simultaneously meet the functional requirements of multi-band, full-duplex communication within a limited installation space.

[0006] 3. Poor economic efficiency: The large antenna aperture and multiple separate array systems will significantly increase the manufacturing cost of antenna hardware and subsequent maintenance costs.

[0007] Therefore, how to solve the physical obstruction and electromagnetic interference between antennas of different frequency bands within an extremely limited physical aperture, and achieve highly integrated multi-band common aperture operation, is a technical problem that urgently needs to be solved in the field of millimeter-wave satellite communication. Summary of the Invention

[0008] The purpose of this invention is to overcome the aforementioned deficiencies of the prior art and provide a Ku / Ka co-aperture phased array antenna system. This system, through a novel heterogeneous stacked architecture and high-density vertical interconnect design, solves the electromagnetic interference problem when antennas of different frequency bands share the same aperture. It can simultaneously achieve conical beam scanning of both the Ku and Ka bands, and features high integration, light weight, small size, multi-polarization, and low cost.

[0009] The technical solution of the present invention is as follows: A Ku / Ka co-aperture phased array antenna system, comprising: A Ku / Ka co-aperture antenna array, wherein a Ku-band antenna and a Ka-band antenna are integrated into the same aperture; wherein the Ka-band antenna is disposed on the upper layer and fed and radiated through patch coupling, and the Ku-band antenna is disposed on the lower layer and fed and radiated through slot coupling; the Ku / Ka co-aperture antenna array has an antenna feed RF port; An antenna adapter board is disposed on one side of the Ku / Ka common aperture antenna array. The antenna adapter board includes an adapter stripline, a beam control circuit, and a Ku / Ka dual-band power divider network. The adapter stripline is used for interconnection with the antenna feed RF port, and the Ku / Ka dual-band power divider network is used for power combining of the RF signals received by the Ku / Ka common aperture antenna array. The radio frequency connector is used to interconnect the Ku / Ka common aperture antenna array and the antenna adapter board.

[0010] Furthermore, the Ku / Ka co-aperture antenna array is arranged in layers from top to bottom as follows: Ka-band upper patch layer, Ka-band lower patch layer, Ka-band feed stripline layer, Ku-band slot coupling layer, and Ku-band feed stripline layer; The radiating layer of the Ka-band antenna consists of an upper Ka-band patch layer and a lower Ka-band patch layer, and the Ku-band antenna is fed through the Ku-band slot coupling layer and the Ku-band feed stripline layer.

[0011] Furthermore, the upper Ka-band patch layer includes a square annular metal pattern patch, and the lower Ka-band patch layer includes a square metal pattern patch; The Ka-band antenna supports dual circular polarization, and the left and right circular polarization can be switched.

[0012] Furthermore, a cross-shaped slot is etched on the Ku-band slot coupling layer; The Ku-band antenna supports dual linear polarization, and the linear polarization angle can be switched. The ratio of the number of antenna patches for the Ku-band antenna to that for the Ka-band antenna is 1:4.

[0013] Furthermore, the Ku-band fed stripline layer includes a Ku-band fed stripline and short-circuit metal pillars; The short-circuit metal post is used for impedance matching of the Ku-band antenna.

[0014] Furthermore, the upper Ka-band patch layer is printed on the first dielectric substrate, the lower Ka-band patch layer is printed on the second dielectric substrate, the Ka-band feed stripline layer is etched on the third dielectric substrate, the Ku-band slot coupling layer is etched on the fourth dielectric substrate, and the Ku-band feed stripline layer is printed on the fifth dielectric substrate. The dielectric constant of the first dielectric substrate is less than that of the second to fifth dielectric substrates.

[0015] Furthermore, the Ku / Ka dual-band power divider network is a two-layer stripline structure, including a Ku-band power divider network in the upper layer and a Ka-band power divider network in the lower layer. Both the Ku-band power divider network and the Ka-band power divider network are printed on their respective dielectric substrates.

[0016] Furthermore, both the Ku-band power divider network and the Ka-band power divider network contain Wilkinson power dividers and radio frequency ports.

[0017] Furthermore, it also includes: a TR component with an RF port; The TR components are interconnected to the bottom layer of the antenna adapter board via BGA ball soldering; The adapter stripline is used to connect the radio frequency port of the TR component to the antenna feed radio frequency port of the Ku / Ka common aperture antenna array.

[0018] Furthermore, the radio frequency connector is a button; The Ku / Ka common aperture antenna array and the antenna adapter board are vertically interconnected for radio frequency signals via the fuzzy buttons.

[0019] Compared with existing technologies, the advantages of this invention are: 1. Overcoming spatial limitations to achieve extreme reduction in size and weight. This invention breaks through the spatial barriers of traditional split-aperture antennas. Through a heterogeneous stacked architecture of "Ka-band high-frequency patch coupling on the upper layer and Ku-band low-frequency slot coupling on the lower layer," it avoids the obstruction and scattering of high-frequency signals by the low-frequency structure, while allowing low-frequency electromagnetic waves to penetrate without obstruction. For airborne satellite communication phased array antennas, this solution can reduce the original four split antennas to two, reducing the skin size by more than 50%, greatly reducing the antenna weight, making it easier to install and disassemble, and providing extremely significant stealth design advantages.

[0020] 2. Ingeniously matching physical laws to achieve wide-angle, lobe-free beam scanning. This invention creatively sets the ratio of antenna patches between the Ku-band and Ka-band antennas to a strict 1:4. This ratio perfectly matches the approximately twice-wavelength relationship between the Ku and Ka bands, ensuring that the spacing between radiating elements in both bands on the same physical array surface strictly meets the phased array layout physical criterion of "less than half the wavelength of the highest operating frequency." Therefore, this invention successfully achieves wide-range conical beam scanning within ±60° of both bands without increasing the array area, and without significant lobe degradation.

[0021] 3. Flexible multi-polarization reconfiguration to adapt to complex communication needs. In this invention, the Ka band uses a double-layer metal pattern patch with square rings and squares, introducing dual resonant points to broaden the axial ratio bandwidth, realizing flexible switching between Ka band dual circular polarization and left / right circular polarization; the Ku band achieves dual linear polarization and slewable linear polarization angles through orthogonal excitation of the bottom cross-shaped slots. This multi-polarization feature greatly enhances the antenna system's compatibility with different satellite communication systems.

[0022] 4. High-density three-dimensional vertical interconnection enhances RF channel isolation and reliability. This invention's antenna system integrates a common-aperture antenna array, antenna adapter board (including beam control, power layer, and dual-layer power divider network), and TR active components in a high-density manner. Inter-layer transmission of RF signals utilizes a stripline network including Wilkinson power dividers, BGA ball soldering, and "button-like" flexible blind-plug interconnection technology. The synergistic effect of these physical hardware components not only achieves ultra-low-loss vertical transmission across hundreds or thousands of RF channels but also ensures extremely high electromagnetic isolation between transmit and receive channels using isolation resistors and minimal parasitic inductance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1(a) is a schematic diagram of the stacked structure of the Ku / Ka co-aperture antenna array provided in an embodiment of the present invention; Figure 1(b) is a schematic diagram of the structure of the Ka-band upper patch layer provided in an embodiment of the present invention; Figure 1(c) is a schematic diagram of the structure of the Ka-band lower patch layer provided in an embodiment of the present invention; Figure 1(d) is a schematic diagram of the Ka-band fed stripline layer provided in an embodiment of the present invention; Figure 1(e) is a schematic diagram of the Ku-band slot coupling layer provided in an embodiment of the present invention; Figure 1(f) is a schematic diagram of the Ku-band fed stripline layer provided in an embodiment of the present invention; Figure 2(a) is a schematic diagram of the stripline transition layer in the antenna transition board provided in an embodiment of the present invention; Figure 2(b) is a schematic diagram of the Ku-band power divider network in the antenna adapter board provided in the embodiment of the present invention; Figure 2(c) is a schematic diagram of the Ka-band power divider network in the antenna adapter board provided in the embodiment of the present invention; Figure 3 This is a schematic diagram of the overall cross-sectional architecture of the Ku / Ka co-aperture phased array antenna system provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures: L1-Ka band upper patch layer; L2-Ka band lower patch layer; L3-Ka band feed stripline layer; L4-Ku band slot coupling layer; L5-Ku band feed stripline layer; 1-First dielectric substrate; 2-Second dielectric substrate; 3-Third dielectric substrate; 4-Fourth dielectric substrate; 5-Fifth dielectric substrate; 6-Sixth dielectric substrate; 7-Seventh dielectric substrate; 8-Eighth dielectric substrate; 101-Square ring-shaped metal pattern patch; 201 - Square metal pattern patch; 301-Ka band feed stripline; 401 - Cross-shaped gap; 501 - Ku-band feed stripline; 502 - Short-circuit metal post; 601-Ku band adapter cable; 602-Ka band adapter cable; 701-Ku band power divider network; 801-Ka band power divider network. Detailed Implementation

[0026] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0028] Example 1 like Figure 3 As shown, this embodiment provides a Ku / Ka co-aperture phased array antenna system, including: A Ku / Ka co-aperture antenna array, wherein a Ku-band antenna and a Ka-band antenna are integrated into the same aperture; wherein the Ka-band antenna is disposed on the upper layer and fed and radiated through patch coupling, and the Ku-band antenna is disposed on the lower layer and fed and radiated through slot coupling; the Ku / Ka co-aperture antenna array has an antenna feed RF port; An antenna adapter board is disposed on one side of the Ku / Ka common aperture antenna array. The antenna adapter board includes an adapter stripline, a beam control circuit, and a Ku / Ka dual-band power divider network. The adapter stripline is used for interconnection with the antenna feed RF port, and the Ku / Ka dual-band power divider network is used for power combining of the RF signals received by the Ku / Ka common aperture antenna array. The radio frequency connector is used to interconnect the Ku / Ka common aperture antenna array and the antenna adapter board.

[0029] In this embodiment, it should be noted that the core challenge of the common-aperture design lies in the physical interference and electromagnetic coupling between high- and low-frequency antennas. This invention cleverly employs a heterogeneous stacked architecture where the Ka band (high frequency) uses patch coupling on the upper layer and the Ku band (low frequency) uses slot coupling on the lower layer. Its working principle is as follows: because the Ka band has a shorter wavelength, placing it on the upper layer avoids the low-frequency structure from blocking and scattering the high-frequency signal; while the Ku band has a longer wavelength, the Ku band electromagnetic waves in the lower layer can effectively penetrate or bypass the physical structure of the upper Ka band and radiate outwards through slot coupling. This architecture, without increasing the antenna radiating aperture, can reduce the original four antennas of an airborne satellite communication phased array to two, reducing the overall skin size by more than 50%, greatly reducing the antenna weight and additional installation resources, making it particularly suitable for airborne stealth design and vehicle-mounted multi-band multi-polarization communication scenarios. The beam control circuit mainly achieves spatial scanning of the antenna beam by controlling the phase shift and supplying power to the subsequent active components.

[0030] As shown in Figure 1(a), further, the Ku / Ka common aperture antenna array is arranged in layers from top to bottom as follows: Ka-band upper patch layer (L1 layer), Ka-band lower patch layer (L2 layer), Ka-band feed stripline layer (L3 layer), Ku-band slot coupling layer (L4 layer), and Ku-band feed stripline layer (L5 layer). The radiating layer of the Ka-band antenna consists of an upper Ka-band patch layer and a lower Ka-band patch layer, and the Ku-band antenna is fed through the Ku-band slot coupling layer and the Ku-band feed stripline layer.

[0031] As shown in Figures 1(b) and 1(c), the upper Ka-band patch layer further includes a square annular metal pattern patch 101, and the lower Ka-band patch layer includes a square metal pattern patch 201; the Ka-band antenna supports dual circular polarization, and the left and right circular polarization can be switched.

[0032] In this embodiment, it should be noted that the square annular metal pattern patch 101 and the square metal pattern patch 201 work together to form a Ka-band broadband radiating element. By utilizing the double-layer stacked patch structure, two similar resonant frequencies are introduced, thereby effectively widening the impedance bandwidth and axial ratio bandwidth of the Ka-band antenna and ensuring high-quality switching between left-hand and right-hand circular polarization.

[0033] As shown in Figure 1(d), the Ka-band feed stripline layer includes a Ka-band feed stripline 301, which is used to feed the patch of the Ka-band antenna.

[0034] As shown in Figure 1(e), further, a cross-shaped slot 401 is etched on the Ku-band slot coupling layer; the Ku-band antenna supports dual linear polarization, and the linear polarization angle can be switched; the ratio of the number of antenna patches of the Ku-band antenna to that of the Ka-band antenna is 1:4.

[0035] In this embodiment, it should be noted that the cross-shaped slot 401 has two orthogonal radiation slots. By exciting the two orthogonal slots with equal amplitude or different amplitudes and phases, flexible switching of Ku-band dual-linear polarization can be achieved. It is worth emphasizing that, in order to meet the physical requirements of grating-lobe-free scanning of phased array antennas (the spacing between antenna elements must be less than or equal to half the wavelength of the highest operating frequency), and since the operating frequency of the Ku band is approximately half that of the Ka band, this embodiment creatively sets the design ratio of the Ku-band antenna to the Ka-band antenna to a strict 1:4. That is, within the same array physical area, for every Ku-band radiation element, 2×2=4 Ka-band radiation elements are arranged directly above it, thus perfectly matching the half-wavelength array requirement of the dual bands. Under the same aperture, it ensures that both bands can achieve conical beam scanning within a ±60° range without significant grating-lobe degradation.

[0036] As shown in Figure 1(f), the Ku-band feed stripline layer further includes a Ku-band feed stripline 501 and a short-circuit metal post 502; the short-circuit metal post 502 is used for impedance matching of the Ku-band antenna.

[0037] In this embodiment, it should be noted that the short-circuit metal post 502 is disposed through the dielectric substrate. By adjusting the distance between the short-circuit metal post 502 and the center position of the cross-shaped slot 401, the capacitive or inductive reactance introduced by the slot coupling can be offset, thereby accurately matching the input impedance to 50 ohms and effectively reducing the return loss.

[0038] Furthermore, the upper Ka-band patch layer is printed on the first dielectric substrate 1, the lower Ka-band patch layer is printed on the second dielectric substrate 2, the Ka-band feed stripline layer is etched on the third dielectric substrate 3, the Ku-band gap coupling layer is etched on the fourth dielectric substrate 4 (the rest of the surface is copper-clad), and the Ku-band feed stripline layer is printed on the fifth dielectric substrate 5; wherein, the dielectric constant of the first dielectric substrate 1 is less than the dielectric constant of the second to fifth dielectric substrates.

[0039] In the specific parameter design of this embodiment, the dielectric constant of the first dielectric substrate 1 is preferably 2.2 and the thickness is 0.635 mm; the dielectric constant of the second dielectric substrate 2 is preferably 2.94 and the thickness is 0.127 mm; the dielectric constant of the third dielectric substrate 3 is preferably 2.94 and the thickness is 0.381 mm; the dielectric constant of the fourth dielectric substrate 4 is preferably 2.94 and the thickness is 0.762 mm; and the dielectric constant of the fifth dielectric substrate 5 is preferably 2.94 and the thickness is 0.762 mm.

[0040] In this embodiment, the dielectric constant of the outermost first dielectric substrate 1 is set to a low value (2.2) because a lower dielectric constant can effectively reduce the Q value (quality factor) of the antenna radiating patch, thereby suppressing the generation of surface waves. This not only broadens the radiation bandwidth of the Ka-band antenna, but also improves the efficiency of the antenna radiating into free space and reduces the dielectric loss in the high-frequency band.

[0041] As shown in Figures 2(a), 2(b), and 2(c), the Ku / Ka dual-band power divider network is further described as a double-layer stripline structure, comprising a Ku-band power divider network disposed on the upper layer and a Ka-band power divider network disposed on the lower layer; both the Ku-band power divider network and the Ka-band power divider network are printed on their respective dielectric substrates.

[0042] Specifically, in Figure 2(a), 601 is the Ku-band adapter cable and 602 is the Ka-band adapter cable, both printed on dielectric substrate 6 (dielectric constant 2.94, thickness 0.254mm); the Ku-band power divider network, as shown in Figure 2(b) at 701, is printed on dielectric substrate 7 (dielectric constant 2.94, thickness 0.254mm); the Ka-band power divider network, as shown in Figure 2(c) at 801, is printed on dielectric substrate 8 (dielectric constant 2.94, thickness 0.254mm). This double-layer three-dimensional wiring design greatly saves the lateral area of ​​the adapter board.

[0043] Furthermore, both the Ku-band power divider network and the Ka-band power divider network contain Wilkinson power dividers and radio frequency ports.

[0044] In this embodiment, it should be noted that the Wilkinson Power Divider integrates isolation resistors. Its working principle is to distribute the input signal with equal amplitude and phase to multiple output ports, ensuring excellent high isolation between each output port. This is crucial for phased array antennas to prevent signal crosstalk between feed channels during multi-channel signal synthesis, thus guaranteeing the signal-to-noise ratio of the received signal.

[0045] like Figure 3As shown, it further includes: a TR component with an radio frequency port ( Figure 3 The TR module (identified as KuKDP-A common aperture R module) is interconnected to the bottom layer of the antenna adapter board via BGA ball soldering; the adapter stripline is used to connect the RF port of the TR module to the antenna feed RF port of the Ku / Ka common aperture antenna array.

[0046] In this embodiment, it should be noted that the TR component (transceiver module) integrates a low-noise amplifier (LNA), a power amplifier (PA), a digitally controlled phase shifter, and an attenuator. The beam control circuit sends beam control commands to the phase shifter within the TR component to change the feed phase difference of each antenna element in the array, thereby macroscopically achieving a wide-range ±60° conical scan of the antenna beam in space. The use of BGA (ball grating array) bonding technology enables the provision of numerous short-distance interconnect nodes between ground planes with minimal parasitic inductance, making it ideal for high-density three-dimensional vertical interconnects in the microwave / millimeter-wave bands.

[0047] Combination Figure 3 As can be seen from the overall architecture, the antenna adapter board in this embodiment actually constitutes the motherboard of the Ku / Ka common aperture antenna, which integrates the Ku / Ka power divider network layer, power supply layer, and stripline adapter layer from top to bottom with high density. This architecture achieves high-density integrated construction of Ku / Ka common aperture antenna array, beam control, power supply, and active RF circuitry.

[0048] In this embodiment, specifically, the RF connector is a button; the Ku / Ka common aperture antenna array and the antenna adapter board are vertically interconnected via the button to achieve RF signal interconnection.

[0049] In this embodiment, it should be noted that the fuzz button is a cylindrical, elastic metal interconnect made of a single gold-plated molybdenum wire wound in a random order. In the millimeter-wave band, compared to traditional pin-type RF connectors, the fuzz button connector not only has excellent impedance consistency and ultra-low high-frequency transmission loss, but its elastic structure can also effectively absorb mechanical tolerances and temperature stresses during assembly, ensuring pad-free, high-reliability blind-mating interconnection of hundreds or thousands of RF channels between a large-area phased array antenna array and the adapter board.

[0050] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

[0051] This background section is provided to generally present the context of the invention. The work of the currently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither expressly nor impliedly acknowledged as prior art to the invention.

Claims

1. A Ku / Ka co-aperture phased array antenna system, characterized in that, include: A Ku / Ka co-aperture antenna array, wherein a Ku-band antenna and a Ka-band antenna are integrated into the same aperture; wherein the Ka-band antenna is disposed on the upper layer and fed and radiated through patch coupling, and the Ku-band antenna is disposed on the lower layer and fed and radiated through slot coupling; the Ku / Ka co-aperture antenna array has an antenna feed RF port; An antenna adapter board is disposed on one side of the Ku / Ka common aperture antenna array. The antenna adapter board includes an adapter stripline, a beam control circuit, and a Ku / Ka dual-band power divider network. The adapter stripline is used for interconnection with the antenna feed RF port, and the Ku / Ka dual-band power divider network is used for power combining of the RF signals received by the Ku / Ka common aperture antenna array. The radio frequency connector is used to interconnect the Ku / Ka common aperture antenna array and the antenna adapter board.

2. The Ku / Ka co-aperture phased array antenna system according to claim 1, characterized in that, The Ku / Ka common aperture antenna array is arranged in layers from top to bottom as follows: Ka-band upper patch layer, Ka-band lower patch layer, Ka-band feed stripline layer, Ku-band slot coupling layer, and Ku-band feed stripline layer; The radiating layer of the Ka-band antenna consists of an upper Ka-band patch layer and a lower Ka-band patch layer, and the Ku-band antenna is fed through the Ku-band slot coupling layer and the Ku-band feed stripline layer.

3. The Ku / Ka co-aperture phased array antenna system according to claim 2, characterized in that, The upper Ka-band patch layer includes a square ring-shaped metal pattern patch, and the lower Ka-band patch layer includes a square metal pattern patch; The Ka-band antenna supports dual circular polarization, and the left and right circular polarization can be switched.

4. The Ku / Ka co-aperture phased array antenna system according to claim 2, characterized in that, A cross-shaped slot is etched on the Ku-band slot coupling layer; The Ku-band antenna supports dual linear polarization, and the linear polarization angle can be switched. The ratio of the number of antenna patches for the Ku-band antenna to that for the Ka-band antenna is 1:

4.

5. The Ku / Ka co-aperture phased array antenna system according to claim 2, characterized in that, The Ku-band feed stripline layer includes a Ku-band feed stripline and short-circuit metal pillars; The short-circuit metal post is used for impedance matching of the Ku-band antenna.

6. The Ku / Ka co-aperture phased array antenna system according to any one of claims 2 to 5, characterized in that, The upper Ka-band patch layer is printed on the first dielectric substrate, the lower Ka-band patch layer is printed on the second dielectric substrate, the Ka-band feed stripline layer is etched on the third dielectric substrate, the Ku-band slot coupling layer is etched on the fourth dielectric substrate, and the Ku-band feed stripline layer is printed on the fifth dielectric substrate. The dielectric constant of the first dielectric substrate is less than that of the second to fifth dielectric substrates.

7. The Ku / Ka co-aperture phased array antenna system according to claim 1, characterized in that, The Ku / Ka dual-band power divider network is a two-layer stripline structure, including a Ku-band power divider network in the upper layer and a Ka-band power divider network in the lower layer. Both the Ku-band power divider network and the Ka-band power divider network are printed on their respective dielectric substrates.

8. The Ku / Ka co-aperture phased array antenna system according to claim 7, characterized in that, Both the Ku-band power divider network and the Ka-band power divider network contain Wilkinson power dividers and RF ports.

9. The Ku / Ka co-aperture phased array antenna system according to claim 1, characterized in that, Also includes: TR components with radio frequency ports; The TR components are interconnected to the bottom layer of the antenna adapter board via BGA ball soldering; The adapter stripline is used to connect the radio frequency port of the TR component to the antenna feed radio frequency port of the Ku / Ka common aperture antenna array.

10. The Ku / Ka co-aperture phased array antenna system according to claim 1, characterized in that, The radio frequency connector is a button; The Ku / Ka common aperture antenna array and the antenna adapter board are vertically interconnected for radio frequency signals via the fuzzy button.

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