A small-sized vehicle-mounted satellite communication dual-frequency circularly polarized antenna with integrated transmitting and receiving functions

Abstract

The application discloses a kind of miniaturization vehicle-mounted satellite communication dual-frequency circular polarization antennas of transceiving integration.The antenna includes transmitting antenna, receiving antenna and feed network;Transmitting antenna is composed of first dielectric plate and first metal antenna;Receiving antenna is composed of second dielectric plate and second metal antenna;Transmitting antenna and receiving antenna are nested;Transmitting antenna and receiving antenna are placed on feed network;First dielectric plate is surrounded into rectangular structure, and first metal antenna is attached to the outer surface of first dielectric plate on rectangular structure;Second dielectric plate is surrounded into rectangular structure, and second metal antenna is attached to the outer surface of second dielectric plate on rectangular structure;The bottom end of the first metal antenna of transmitting antenna and the bottom end of the second metal antenna of receiving antenna are connected with feed network, for transmitting / receiving electromagnetic signal.Compared with the characteristics of traditional dual-frequency satellite communication antenna, which is large in size and high in operating frequency band, the application realizes a low-profile satellite communication antenna with low operating frequency band.

Description

Technical Field

[0001] This invention relates to the fields of UHF band, VHF band, miniaturized antenna, and satellite communication technology, specifically to a miniaturized vehicle-mounted dual-band circularly polarized antenna for satellite communication that integrates transceiver functions. Background Technology

[0002] Satellite communication antennas commonly use circularly polarized antennas to address polarization mismatch. Although researchers have conducted extensive research on miniaturized circularly polarized antennas, developing various technical solutions based on high-dielectric-constant media, stub distribution, and meandering techniques, achieving centimeter-sized circularly polarized antennas in the VHF band remains challenging. Furthermore, to improve equipment integration, satellite communication antennas are often dual-band antennas, integrating receiving and transmitting functions.

[0003] On the other hand, miniaturization is a mainstream trend in antenna design, especially in automotive applications, where satellite communication capabilities are often required. These devices typically operate in the Very High Frequency (VHF) and Ultra High Frequency (UHF) bands, with electromagnetic wave wavelengths reaching the meter level, while the available space for antenna installation in vehicles is only on the centimeter level. Common automotive antenna mounting locations include shark fins, spoilers, under the console, and below the sunroof, etc., where limited space severely restricts the antenna's physical size. Satellite communication, especially emergency communication, generally operates at lower frequencies, with longer wavelengths in the VHF to UHF bands. Therefore, miniaturization of automotive satellite communication antennas has always been a key research focus and hot topic.

[0004] A wide-beam UHF band satellite communication antenna has been proposed in the prior art. This antenna includes a base, multiple dielectric substrates, and a signal phase splitter board. The dielectric substrates are disposed on the signal phase splitter board at an angle to each other. Feed lines are present on the dielectric substrates. The signal phase splitter board is horizontally mounted on the base and has multiple lines connected to the feed lines. This wide-beam UHF band satellite communication antenna has a robust and reliable structure and the advantage of a wide beam; however, its internal structure is complex, and although it is lightweight, its size is relatively large (CN115483525A).

[0005] A vehicle-mounted satellite communication antenna array has been proposed in the prior art. This array includes multiple receiving subarrays, multiple transmitting subarrays, and an antenna board. The receiving and transmitting subarrays are symmetrically arranged on the antenna board; the slope length, horizontal spacing, and tilt of each subarray satisfy a predetermined relationship. In this vehicle-mounted satellite communication antenna array, the symmetrical arrangement of the transmitting and receiving subarrays separates them, reducing mutual interference between signal transmission and reception and improving the transmit / receive isolation of the antenna array. Because the subarrays are tilted and satisfy a uniform predetermined relationship, the vertical height of the antenna array is reduced, resulting in a low profile and easy conformal design with the carrier. Through reasonable design of the predetermined relationship, coverage requirements with an antenna beam elevation angle of 20 to 90 degrees can be met. However, the proposed antenna's feed network contains two stages of phase-shifting networks, each stage including a power amplifier and a phase shifter, as well as two stages of power divider networks. This makes the antenna feed network overly complex and expensive (CN113285244A).

[0006] A low-profile phase-shifting satellite communication antenna has been proposed in the prior art. This antenna includes a controller, an RF switch array, and a radiating layer, a reflective layer, a phase-shifting layer, a shielding layer, and an extended phase-shifting layer stacked from top to bottom. The radiating layer includes a feed point and several antenna radiating surfaces arranged in an array on a first dielectric layer. The feed point is connected to the antenna radiating surfaces. The reflective layer is a copper layer completely laid on a second dielectric layer. The phase-shifting layer includes dielectric vias formed on a third dielectric layer, a phase-shifting network arranged on the surface of the third dielectric layer, and switch array interfaces located at the ends of the phase-shifting network. This invention provides a low-profile phase-shifting satellite communication antenna that generates a millisecond-level beam capable of real-time beam direction switching for tracking dynamic satellites. It employs a minimal component structure and offers advantages such as low cost and fast tracking. However, the proposed low-profile phase-shifting satellite communication antenna has a relatively large antenna size, making installation in vehicles difficult (CN108767463A). Summary of the Invention

[0007] The purpose of this invention is to propose a miniaturized vehicle-mounted satellite communication dual-frequency circularly polarized antenna that integrates transceiver capabilities.

[0008] The objective of this invention is achieved by at least one of the following technical solutions.

[0009] A miniaturized vehicle-mounted dual-band circularly polarized satellite communication antenna integrating transceiver, comprising a transmitting antenna, a receiving antenna, and a feed network;

[0010] The transmitting antenna consists of a first dielectric substrate and a first metal antenna; the receiving antenna consists of a second dielectric substrate and a second metal antenna; the transmitting antenna and the receiving antenna are nested together, with the transmitting antenna located outside the receiving antenna.

[0011] The transmitting and receiving antennas are placed on the feed network;

[0012] A first dielectric substrate is formed into a rectangular structure, and a first metal antenna is attached to the outer surface of the first dielectric substrate on the rectangular structure; a second dielectric substrate is formed into a rectangular structure, and a second metal antenna is attached to the outer surface of the second dielectric substrate on the rectangular structure.

[0013] The bottom of the first metal antenna of the transmitting antenna and the bottom of the second metal antenna of the receiving antenna are both connected to the feed network to transmit / receive electromagnetic signals.

[0014] Furthermore, the circularly polarized antenna adopts a sequential rotating feed point method, and the transmitting antenna adopts a printed inverted F-shaped antenna, resonating at the first operating frequency point; the first metal antenna is composed of four single antenna elements obtained by sequentially rotating one antenna element by 90°, and each element is a printed inverted F-shaped antenna;

[0015] In the first metallic antenna, the horizontal radiating arm of each printed inverted F-shaped antenna element is first folded vertically downward once, then folded horizontally towards the feed point once, then folded vertically upward once, and finally folded horizontally in the opposite direction to the feed point once.

[0016] Furthermore, the receiving antenna is a printed inverted F-shaped antenna that resonates at the second operating frequency; the second metal antenna consists of four single antenna elements obtained by rotating one antenna element sequentially by 90°, and each element is a printed inverted F-shaped antenna.

[0017] In the second metallic antenna, the horizontal radiating arm of each printed inverted F-shaped antenna element is first folded vertically downward once, then folded horizontally towards the feed point once, then folded vertically upward once, then folded horizontally in the opposite direction to the feed point once, and finally folded vertically downward once.

[0018] Furthermore, the power supply network consists of a power distribution network with a center frequency of the first operating frequency and a power combining network with a center frequency of the second operating frequency;

[0019] The power distribution network includes one input port and four output ports. In the power distribution network, the signal from the input port enters the power distribution network and then becomes the output signals of the first output port and the second output port. The first output port and the second output port are each connected to a 180° phase delay line. The other ends of the two phase delay lines serve as the third output port and the fourth output port, respectively. After the input signal enters the power distribution network from the input port, the four output ports will obtain four output signals with normalized phases of 0°, 90°, 180° and 270°, respectively, and the current amplitude of each signal is the same.

[0020] The power combining network includes one output port and four input ports. In the power combining network, the first input port and the second input port are each connected to a 180° phase delay line. The other ends of the two phase delay lines serve as the third input port and the fourth input port, respectively. The input signals of the four input ports are connected in parallel to form two signals that enter the power combining network to obtain one output signal.

[0021] Furthermore, the power combining network has the same structure as the power distribution network, but the size of the power combining network is smaller than that of the power distribution network.

[0022] Furthermore, the power combining network is stacked on top of the power distribution network.

[0023] Furthermore, the feed point of each printed inverted F-shaped antenna element in the transmitting antenna is connected to the output port of the power distribution network.

[0024] Furthermore, the feed point of each printed inverted F-shaped antenna element in the receiving antenna is connected to the input port of the power combining network.

[0025] Furthermore, the length of the dielectric substrate of the transmitting antenna is greater than the length of the dielectric substrate of the receiving antenna.

[0026] Furthermore, the height of the first dielectric substrate is less than the height of the second dielectric substrate.

[0027] Compared with the prior art, the advantages of this invention are:

[0028] This invention employs a sequential rotational feeding method and a bent, printed inverted F-shaped antenna to achieve communication between ground vehicles and near-Earth satellites. Furthermore, by nesting two antenna sets on the same grounding surface, the antenna size is easily reduced.

[0029] This invention ensures high-quality communication between ground vehicles and near-Earth satellites while maintaining a compact structure and dual-frequency operation, and enables continuous communication under low elevation angle conditions. Therefore, this invention improves upon existing satellite communication antennas by repeatedly folding the radiating arms of a printed inverted F-shaped antenna and nesting the receiving and transmitting antennas on top of the feed network. This achieves antenna miniaturization while ensuring high-quality communication between ground vehicles and near-Earth satellites.

[0030] The overall size of this invention is less than 120×120×20 cubic millimeters, with a compact structure; the 70° gain is greater than -15dB, enabling high-quality communication between vehicles and near-Earth satellites at low elevation angles; the entire system has good stability; and there is good isolation between the two frequency points provided by this invention. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a miniaturized vehicle-mounted satellite communication dual-frequency circularly polarized antenna that integrates transceiver functions, according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the transmitting antenna in an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the first metal antenna of the transmitting antenna in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the receiving antenna structure in an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the second metal antenna for receiving antenna in an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the power supply network structure in an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the power distribution network with a center frequency of the first operating frequency in an embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram of the internal metal wire circuit network structure of the power distribution network with the center frequency of the first operating frequency point in an embodiment of the present invention.

[0039] Figure 9 This is a schematic diagram of the power combining network with a center frequency of the second operating frequency in an embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram of the internal metal wire circuit network structure of the power combining network with the center frequency of the second operating frequency in an embodiment of the present invention.

[0041] Figure 11 This is a schematic diagram of the overall structure in an embodiment of the present invention.

[0042] Figure 12 This is a schematic diagram of the transmitting antenna in an embodiment of the present invention.

[0043] Figure 13 This is a schematic diagram of the structure of the first metal frame of the transmitting antenna in an embodiment of the present invention.

[0044] Figure 14 This is a schematic diagram of the receiving antenna structure in an embodiment of the present invention.

[0045] Figure 15 This is a schematic diagram of the structure of the second metal frame of the receiving antenna in an embodiment of the present invention. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These descriptions are intended to explain the invention and not to limit it.

[0047] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0048] In the attached diagram, arrow X indicates the front direction (front-to-back), arrow Y indicates the side direction (left-to-right), and arrow Z indicates the vertical direction (up-down).

[0049] Example 1

[0050] Figure 1 This is a schematic diagram of a miniaturized vehicle-mounted satellite communication dual-band circularly polarized antenna with integrated transceiver provided in Embodiment 1 of the present invention. Figure 1 As shown, the vehicle-mounted satellite communication antenna includes a transmitting antenna 1, a receiving antenna 2, and a feed network 3;

[0051] The transmitting antenna 1 is composed of a first dielectric substrate 101 and a first metal antenna 102; the receiving antenna 2 is composed of a second dielectric substrate 201 and a second metal antenna 202; the transmitting antenna 1 and the receiving antenna 2 are nested together, with the transmitting antenna 1 located outside the receiving antenna 2.

[0052] Transmitting antenna 1 and receiving antenna 2 are placed on the feed network 3;

[0053] A first dielectric substrate 101 is formed into a rectangular structure, and a first metal antenna 102 is attached to the outer surface of the first dielectric substrate 101 on the rectangular structure; a second dielectric substrate 201 is formed into a rectangular structure, and a second metal antenna 202 is attached to the outer surface of the second dielectric substrate 201 on the rectangular structure.

[0054] The bottom ends of the first metal antenna 102 of transmitting antenna 1 and the second metal antenna 202 of receiving antenna 2 are both connected to the feed network 3 to transmit / receive electromagnetic signals.

[0055] In this embodiment, the transmitting antenna 1 is as follows: Figure 2 As shown; the first dielectric substrate 101 has a thickness of 2.3mm, a height of 16.5mm, and an outer length of 100mm; the first dielectric substrate 101 has two circular holes on the front, back, left, and right sides; taking the front as an example, the center of the circular hole in the upper right corner has a height of 15mm, a diameter of 1.3mm, and is 43mm from the center line; the center of the circular hole in the lower left corner has a height of 1.3mm, a diameter of 1.3mm, and is 33mm from the center line; a semi-cylindrical space is hollowed out in the lower left corner, with a height of 2.1mm, a diameter of 1.2mm, and a distance of 41mm from the center line; the first metal antenna 102 attached to the first dielectric substrate is as follows. Figure 3 As shown. Taking the previous example, the first metal antenna 102 includes a first vertical side 4, a second vertical side 5, a third vertical side 6, and a fourth vertical side 7 arranged in parallel vertical directions; a first horizontal side 8, a second horizontal side 9, a third horizontal side 10, and a fourth horizontal side 11 arranged in parallel horizontal directions; and a first ground side 12. The second horizontal side 9, the third horizontal side 10, and the fourth horizontal side 11 form a capacitor with the ground plane 30102 of the power distribution network 301 with the center frequency of the first operating frequency. The inductance formed by the first vertical side 4 connecting to the power distribution network 301 with the center frequency of the first operating frequency cancels out the capacitor, so that the antenna resonates at the first operating frequency. At this time, the impedance of the antenna is approximately 50 ohms.

[0056] In this embodiment, the receiving antenna 2 is as follows: Figure 4 As shown; the second dielectric substrate 201 has a thickness of 2.3mm, a height of 16.5mm, and an outer length of 68mm; the dielectric substrate 201 has two circular holes on the front, back, left, and right sides; taking the front as an example, the center of the circular hole in the upper left corner is 1.5mm from the upper edge, has a diameter of 1.3mm, and is 27mm from the center line; the center of the circular hole in the lower right corner has a height of 1.3mm, a diameter of 1.3mm, and is 19mm from the center line; a semi-cylindrical space is hollowed out in the lower right corner, with a height of 2.1mm, a diameter of 1.2mm, and a distance of 25mm from the center line; the second metal antenna 202 attached to the second dielectric substrate is as follows. Figure 5As shown. Taking the previous example, the second metal antenna 202 includes a fifth vertical side 13, a sixth vertical side 14, a seventh vertical side 15, an eighth vertical side 16, and a ninth vertical side 17 arranged vertically in parallel; a fifth horizontal side 18, a sixth horizontal side 19, a seventh horizontal side 20, and an eighth horizontal side 21 arranged horizontally in parallel; and a second ground side 22. The sixth horizontal side 19, the seventh horizontal side 20, and the eighth horizontal side 21 form a capacitor with the ground plane 30202 of the power combining network 302 with the center frequency of the second operating frequency. The inductance formed by the fifth vertical side 13 connecting to the power combining network 302 with the center frequency of the second operating frequency cancels out the capacitor, so that the antenna resonates at the second operating frequency. At this time, the impedance of the antenna is approximately 50 ohms.

[0057] Example 2

[0058] Figure 6 This is a schematic diagram of the feeding network for a miniaturized vehicle-mounted dual-band circularly polarized satellite communication antenna with integrated transceiver, provided in Embodiment 2 of the present invention. It should be noted that technical details not described in detail in this embodiment can be found in any of the above embodiments.

[0059] In this embodiment, the bottom end of the first vertical side 4 of the first metal antenna 102 of the transmitting antenna 1 is connected to the ground plane 30102 of the power distribution network 301, whose center frequency is the first operating frequency, by welding. Figure 7 The diagram shows the structural composition of a power distribution network 301 with a center frequency of 30102 and 30103, a dielectric substrate 30104, and an internal metal wire circuit network 30101. The dielectric substrate 30102 is located on the top layer, and the dielectric substrate 30103 is located on the bottom layer. The dielectric substrate 30104 is sandwiched between the two dielectric substrates, and the internal metal wire circuit network 30101 is hollowed out from inside the dielectric substrate.

[0060] Figure 8The diagram shows an internal metal wire circuit network 30101, which includes a first input port 23, a first resistor port 24, a first output port 25, a second output port 26, a third output port 27, a fourth output port 28, a first 180° phase delay line 29, a second 180° phase delay line 30, a first resistor pad 31, and a distribution network 32. The input signal enters the distribution network 32 from the first input port 23. The distribution network 32 is in the form of a branch line coupler, consisting of four circuit metal lines with an electrical length of approximately one-quarter of the operating wavelength connected end to end. After passing through the distribution network 32, the signal amplitudes of the first output port 25 and the second output port 26 are equal, but their phases differ by 90°. After passing through the first 180° phase delay line 29, the first output port 25 and the third output port 27 are connected in parallel, resulting in two output signals with a phase difference of 180° and equal amplitudes. After passing through the second 180° phase delay line 30, the second output port 26 and the fourth output port 28 are connected in parallel, resulting in two output signals with a phase difference of 180° and equal amplitudes. The first output port 25, the second output port 26, the third output port 27, and the fourth output port 28 are connected to the second vertical side 5 of the first metal antenna 102 of the transmitting antenna 1, transmitting the input signal to the antenna and radiating it out. A 50-ohm resistor is soldered to the first resistor port 24 to absorb the influence of this port on the circuit.

[0061] In this embodiment, the bottom end of the fifth vertical side 13 of the second metal antenna 202 of the receiving antenna 2 is connected to the ground plane 30202 of the power combining network 302 in the feed network 3, whose center frequency is the second operating frequency, by welding. The second input port 35, the third input port 36, the fourth input port 37, and the fifth input port 38 are connected to the sixth vertical side 14 of the metal layer 202 of the receiving antenna 2, and transmit the input signal obtained from the antenna to the power combining network 302. Figure 9 The diagram shows the structural composition of the power combining network 302 with a center frequency of the second operating frequency. It includes a ground plane 30202, a ground plane 30203, a dielectric substrate 30204, and an internal metal wire circuit network 30201. Ground plane 30202 is located on the top layer, ground plane 30203 is located on the bottom layer, and the dielectric substrate 30204 is sandwiched between the two ground planes. The internal metal wire circuit network 30201 is hollowed out inside the dielectric substrate. Figure 10The diagram shows an internal metal wire circuit network 2, which includes a fifth output port 33, a second resistor port 34, a second input port 35, a third input port 36, a fourth input port 37, a fifth input port 38, a third 180° phase delay line 39, a fourth 180° phase delay line 40, a second resistor pad 41, and a composite network 42. The input signal enters the power combining network 302 from the receiving antenna. The signal entering the power combining network 302 from the second input port 35 and the signal entering the power combining network 302 from the fourth input port 37 and passing through the third 180° phase delay line 39 are connected in parallel and enter the combining network 42. The signal entering the power combining network 302 from the third input port 36 and the signal entering the power combining network 302 from the fifth input port 37 and passing through the fourth 180° phase delay line 40 are connected in parallel and enter the combining network 42. The combining network 42 adopts the form of a branch line coupler, which consists of four circuit metal lines with an electrical length of approximately one-quarter of the operating wavelength connected end to end. After the two signals enter the combining network 42, they are combined into one output signal, which is output to the next stage system through the fifth output port 33. A 50-ohm resistor is soldered at the second resistor port 34 to absorb the influence of this port on the circuit.

[0062] Example 3

[0063] Figure 11 This is a schematic diagram of a miniaturized, transceiver-integrated vehicle-mounted satellite communication dual-band circularly polarized antenna according to Embodiment 3 of the present invention. Compared to Embodiment 1, the antenna structure in this example has not changed significantly; only the antenna material and the dielectric support material are different. Figure 11 As shown, the vehicle-mounted satellite communication antenna includes a transmitting antenna 401 and a receiving antenna 402. The transmitting antenna 401 is composed of a metal frame antenna 501 and a dielectric support material 502. The receiving antenna 402 is composed of a metal frame antenna 601 and a dielectric support material 602. The transmitting antenna 401 and the receiving antenna 402 are nested together. The dielectric material of the transmitting antenna 401 is longer than that of the receiving antenna 402 and is located outside the receiving antenna 402. The receiving antenna 402, located on the inner side, is slightly higher than the transmitting antenna 401, thereby reducing the overall cross-section of the antenna and ensuring a certain degree of isolation between the transmitting antenna 401 and the receiving antenna 402.

[0064] Transmitting antenna 402 Figure 12 As shown; the metal strip of the metal frame antenna 501 is 1mm thick and 2mm wide; the structure of the metal frame antenna 501 is similar to that of the metal antenna of the transmitting antenna 1 in Embodiment 1, as shown. Figure 13As shown; taking the previous example, the metal frame antenna 501 includes a tenth vertical side 43, an eleventh vertical side 44, a twelfth vertical side 45, and a thirteenth vertical side 46 arranged vertically in parallel; a ninth horizontal side 47, a tenth horizontal side 48, and an eleventh horizontal side 49 arranged horizontally in parallel; and a tilted side 50, a first curved side 51, and a twelfth horizontal side 52 perpendicular to the front of the antenna. The ninth horizontal side 47, the tenth horizontal side 48, and the eleventh horizontal side 49 form a capacitor with the ground plane of the feed network 403, while the inductance formed by the tenth vertical side 43 connecting to the feed network 403 cancels out this capacitor, causing the antenna to resonate at the first operating frequency, at which point the antenna impedance is approximately 50 ohms. The dielectric support material 502 supports the metal frame antenna 501, ensuring that the metal frame antenna 501 does not deform under its own weight.

[0065] Receiving antenna 402 Figure 14 As shown; the metal frame antenna 601 has a strip thickness of 1mm and a width of 2mm; the structure of the metal frame antenna 601 is similar to that of the metal antenna of the receiving antenna 2 in Embodiment 1, such as... Figure 15 As shown; taking the previous example, the metal frame antenna 601 includes fourteenth vertical side 53, fifteenth vertical side 54, sixteenth vertical side 55, seventeenth vertical side 56, and eighteenth vertical side 57 arranged vertically in parallel; thirteenth horizontal side 58, fourteenth horizontal side 59, fifteenth horizontal side 60, and sixteenth horizontal side 61 arranged horizontally in parallel; and a second curved side 62 and a seventeenth horizontal side 63 perpendicular to the front of the antenna. The fourteenth horizontal side 59, fifteenth horizontal side 60, and sixteenth horizontal side 61 form a capacitor with the feed network 403, while the inductance formed by the fourteenth vertical side 53 connected to the feed network 403 cancels out this capacitor, causing the antenna to resonate at the second operating frequency, at which point the antenna impedance is approximately 50 ohms. The dielectric support material 602 supports the metal frame antenna 601, ensuring that the metal frame antenna 601 does not deform under its own weight.

Claims

1. A small-sized vehicle-mounted satellite communication dual-frequency circularly polarized antenna with a transceiver integrated, characterized in that, It includes a transmitting antenna (1), a receiving antenna (2), and a feeding network (3); The transmitting antenna (1) is composed of a first dielectric substrate (101) and a first metal antenna (102); the receiving antenna (2) is composed of a second dielectric substrate (201) and a second metal antenna (202); the transmitting antenna (1) and the receiving antenna (2) are placed on the feed network (3); The first dielectric substrate (101) is arranged in a rectangular structure, and the first metal antenna (102) is attached to the outer surface of the first dielectric substrate (101) on the rectangular structure. The second dielectric substrate (201) is arranged in a rectangular structure, and the second metal antenna (202) is attached to the outer surface of the second dielectric substrate (201) on the rectangular structure; The transmitting antenna (1) and the receiving antenna (2) are nested together, with the transmitting antenna (1) located outside the receiving antenna (2); The bottom of the first metal antenna (102) of the transmitting antenna (1) and the bottom of the second metal antenna (202) of the receiving antenna (2) are both connected to the feed network (3) to transmit / receive electromagnetic signals; The circularly polarized antenna adopts a sequential rotation feeding method. The transmitting antenna (1) adopts a printed inverted F-shaped antenna and resonates at the first operating frequency. The first metal antenna (102) is composed of four antenna elements obtained by sequentially rotating one antenna element by 90°. Each element is a printed inverted F-shaped antenna. In the first metal antenna (102), the horizontal radiating arm of each printed inverted F-shaped antenna element is first folded vertically downward once, then folded horizontally towards the feed point once, then folded vertically upward once, and finally folded horizontally in the opposite direction to the feed point once. The receiving antenna (2) is a printed inverted F-shaped antenna that resonates at the second operating frequency. The second metal antenna (202) consists of four antenna elements obtained by rotating one antenna element sequentially by 90°. Each element is a printed inverted F-shaped antenna. In the second metal antenna (202), the horizontal radiating arm of each printed inverted F-shaped antenna element is first folded vertically downward once, then folded horizontally towards the feed point once, then folded vertically upward once, then folded horizontally in the opposite direction to the feed point once, and finally folded vertically downward once.

2. The compact dual-band circularly polarized antenna for vehicle-mounted satellite communication according to claim 1, wherein, The power supply network (3) consists of a power distribution network (301) with a center frequency of the first operating frequency and a power combining network (302) with a center frequency of the second operating frequency; The power distribution network (301) includes one input port and four output ports. In the power distribution network (301), the signal from the input port enters the power distribution network (301) and then becomes the output signal of the first output port and the second output port. The first output port and the second output port are each connected to a 180° phase delay line. The other ends of the two phase delay lines are respectively used as the third output port and the fourth output port. After the input signal enters the power distribution network from the input port, the four output ports will obtain four output signals with normalized phases of 0°, 90°, 180° and 270°, and the current amplitude of each signal is the same. The power combining network (302) includes one output port and four input ports. In the power combining network (302), the first input port and the second input port are each connected to a 180° phase delay line. The other ends of the two phase delay lines are used as the third input port and the fourth input port, respectively. The input signals of the four input ports are connected in parallel to form two signals that enter the power combining network (302) to obtain one output signal.

3. The compact dual-band circularly polarized antenna for vehicle-mounted satellite communication according to claim 2, characterized in that, The power combining network (302) has the same structure as the power distribution network (301), but the size of the power combining network (302) is smaller than that of the power distribution network (301).

4. The small-sized vehicle-mounted satellite communication dual-frequency circularly polarized antenna of claim 2, wherein, The power combining network (302) is stacked on top of the power distribution network (301).

5. The compact dual-band circularly polarized antenna for vehicle-mounted satellite communication according to claim 1, characterized in that, Each printed inverted F-shaped antenna element in the transmitting antenna (1) is fed to an output port of the power distribution network (301).

6. The compact dual-band circularly polarized antenna for vehicle-mounted satellite communication according to claim 1, wherein, Each printed inverted F-shaped antenna element in the receiving antenna (2) is fed to an input port of the power combining network (302).

7. The small-sized vehicle-mounted satellite communication dual-frequency circularly polarized antenna of claim 1, wherein, The length of the first dielectric substrate (101) of the transmitting antenna (1) is greater than the length of the second dielectric substrate (201) of the receiving antenna (2).

8. A miniaturized vehicle-mounted satellite communication dual-band circularly polarized antenna integrating transceiver as described in claim 1, characterized in that, The height of the first medium plate (101) is less than the height of the second medium plate (201).

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