Microstrip antenna for ultra-wideband radar transceiving

Abstract

The utility model relates to a microstrip antenna used for ultra wide band radar transmit-receive, which comprises a transmitting antenna, a receiving antenna and a dielectric plate, the receiving antenna and the transmitting antenna are both arranged on the dielectric plate, and the receiving antenna and the transmitting antenna have the same structure and are arranged on the same dielectric plate at an interval of a wavelength. The dielectric plates comprise a dielectric plate I, a dielectric plate II and a dielectric plate III, each of the receiving antenna and the transmitting antenna comprises a unit antenna, a metal ground and an antenna feed network, and the metal ground is arranged between the dielectric plate I and the dielectric plate II and between the dielectric plate II and the dielectric plate III; the unit antenna is arranged on the top layer of the first dielectric plate, and the antenna feed network is arranged on the bottom layer of the third dielectric plate. The plane height and the antenna cost of the microstrip antenna for ultra-wideband radar transceiving are reduced, so that a transmitting radar antenna and a receiving radar antenna are integrated into a whole, and the microstrip antenna is better integrated with a radar radio frequency chip into a whole.

Description

Technical Field

[0001] This utility model relates to the field of microstrip antenna technology, and in particular to a microstrip antenna for ultra-wideband radar transceiver. Background Technology

[0002] Ultra-wideband (UWB) radar is a carrier-free pulse system with high-resolution imaging characteristics, possessing excellent sensing and detection capabilities. The UWB radar antenna is one of the key components of an UWB radar system, primarily used to radiate electromagnetic signals and receive reflected echoes from target areas. The performance of the UWB radar antenna directly affects the performance indicators of the radar system.

[0003] Existing ultra-wideband radar antennas are mostly biconical antennas, TEM horn antennas, Vivaldi antennas, helical antennas, and log-periodic antennas. These antennas are not only large in size and cannot be integrated, but also have high cost.

[0004] Chinese patent document CN 107579346 A discloses an ultra-wideband microstrip antenna with a low radar cross-section, comprising a dielectric substrate, a metal ground plane, a polarization conversion surface, radiating elements, and a coaxial connector. The metal ground plane is printed on the lower surface of the dielectric substrate, and the polarization conversion surface is printed on the upper surface of the dielectric substrate. A rectangular cavity is disposed at the upper center of the dielectric substrate, and a radiating element fixed to the output end of the coaxial connector is disposed above the cavity. The polarization conversion surface consists of four polarization conversion element groups, each containing several decreasing fractal elements, with the arrangement directions of the decreasing fractal elements in adjacent polarization conversion element groups differing by 90°. This antenna is used in antenna systems with complex electromagnetic environments to reduce electromagnetic interference between antennas over a wide bandwidth. This technical solution addresses the problem of narrow radar cross-section bandwidth in existing microstrip antennas, rather than solving the problem of large size, inability to integrate, and high antenna cost. Utility Model Content

[0005] This invention provides a microstrip antenna for ultra-wideband radar transceivers, which features small size, low profile, low cost, and easy integration. It integrates the transmitting and receiving antennas on a single dielectric substrate, which not only meets the requirements of high gain and narrow beamwidth, but also makes it easier to integrate the transmitting and receiving antennas with the radar RF chip, making radar testing more convenient and facilitating product integration.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is that the microstrip antenna for ultra-wideband radar transceiver includes a transmitting antenna, a receiving antenna, and a dielectric substrate. The receiving antenna and the transmitting antenna are both disposed on the dielectric substrate. The receiving antenna and the transmitting antenna have the same structure, are disposed on the same dielectric substrate, and are spaced apart by one wavelength.

[0007] By adopting the above technical solution, using transmitting and receiving antennas with the same structure and integrating them on a single dielectric substrate, it not only satisfies the requirements of high gain and narrow beamwidth, but also facilitates the integration of the transmitting and receiving antennas with the radar RF chip, making radar testing more convenient and beneficial for product integration.

[0008] Preferably, the dielectric substrate includes dielectric substrate one, dielectric substrate two, and dielectric substrate three. Both the receiving antenna and the transmitting antenna include a single-element antenna, a metal ground, and an antenna feed network. The metal ground is located between dielectric substrate one and dielectric substrate two, and between dielectric substrate two and dielectric substrate three. The single-element antenna is located on the top layer of dielectric substrate one, and the antenna feed network is located on the bottom layer of dielectric substrate three. Using three dielectric substrates can form a four-layer metal surface, with the antenna radiating element located on the top layer, the metal ground on the middle layer, and the feed network on the bottom layer. The antenna metal ground and the feed network metal ground share a common layer. This structure effectively integrates the feed network and antenna structure onto a single laminated board, avoiding external connections between the feed network and the antenna structure. Furthermore, the integrated design is very convenient to use and has low manufacturing costs.

[0009] Preferably, the unit antenna includes an antenna radiating plate, a metal ground, a microstrip line, a circular slot, and a feed via. The antenna radiating plate is electrically connected to the microstrip line through the feed via and the circular slot.

[0010] Preferably, the antenna feed network includes an input terminal, an output terminal, and an impedance transformation stub, wherein the input terminal is electrically connected to the output terminal through the impedance transformation stub.

[0011] Preferably, the antenna radiating plate is electrically connected to the output port of the antenna feed network through the feed via.

[0012] Preferably, the antenna radiating plate is square, and a rectangular slit is formed on the antenna radiating plate, with the rectangular slit tilted at 45°.

[0013] Preferably, both the receiving antenna and the transmitting antenna include four element antennas, each element antenna spaced half a wavelength apart. By using four element antennas, four radiating plates, and a feeding network to form the transmitting and receiving antennas, and integrating the transmitting and receiving antennas onto a single dielectric substrate, high gain and narrow beamwidth are achieved. This also facilitates integration of the transmitting and receiving antennas with the radar RF chip, making radar testing more convenient and improving product integration.

[0014] Preferably, the antenna feed network includes four output terminals and four impedance transformation stubs, with the four output terminals electrically connected to the four impedance transformation stubs respectively.

[0015] Preferably, the dielectric substrate is an FR4 substrate with a thickness of 1.6 mm, the radiating sheet has a length and width of 8.5 mm, the spacing between each unit antenna is 22.2 mm, and the spacing between the transmitting antenna and the receiving antenna is 46 mm.

[0016] Preferably, the microstrip antenna for ultra-wideband radar transceivers has a center frequency of 7.29 GHz, an impedance bandwidth of less than -10 dB and greater than 1 GHz, a maximum radiation gain of 8.5 dBi, and a 3 dB beamwidth of 26°.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the antenna profile height and antenna cost of the microstrip antenna used for ultra-wideband radar transceiver are reduced, and the transmitting radar antenna and receiving radar antenna are integrated into one unit, which is better integrated with the radar radio frequency chip. Attached Figure Description

[0018] Figure 1 This is a unit antenna diagram of the microstrip antenna for ultra-wideband radar transceiver according to this utility model;

[0019] Figure 2 This is a diagram of the feed network for the microstrip antenna used in ultra-wideband radar transceiver according to this invention.

[0020] Figure 3 This is a structural diagram of the microstrip antenna for ultra-wideband radar transceiver according to this utility model;

[0021] Figure 4 This is a side view of the microstrip antenna for ultra-wideband radar transceiver according to the present invention.

[0022] Figure 5 S11 is the unit antenna port reflection of the microstrip antenna for ultra-wideband radar transceiver of this utility model;

[0023] Figure 6 This is the antenna pattern of a single unit antenna of the microstrip antenna for ultra-wideband radar transceiver according to this utility model;

[0024] Figure 7 S11 is the reflection of the input port of the feed network for the microstrip antenna used in ultra-wideband radar transceiver of this utility model;

[0025] Figure 8 The output port phase of the feed network for the microstrip antenna used in ultra-wideband radar transceiver of this invention;

[0026] Figure 9 The port reflection S-parameters of the microstrip antenna for ultra-wideband radar transceiver of this invention;

[0027] Figure 10This is the transmitting antenna pattern of the microstrip antenna for ultra-wideband radar transceiver of this utility model;

[0028] Figure 11 This is the receiving antenna pattern of the microstrip antenna for ultra-wideband radar transceiver of this utility model;

[0029] Wherein: 1-Antenna feed network; 101-Transmitting antenna feed network; 1011-Transmitting antenna feed network output terminal one; 1012-Transmitting antenna feed network output terminal two; 1013-Transmitting antenna feed network output terminal three; 1014-Transmitting antenna feed network output terminal four; 1015-Transmitting antenna feed network input terminal; 102-Receiving antenna feed network; 1021-Receiving antenna feed network output terminal one; 1022-Receiving antenna feed network output terminal two; 1023-Receiving antenna feed network output terminal three; 1024-Receiving antenna feed network output terminal four; 1025-Receiving antenna feed network input terminal; 2-Single Element Antenna; 201-Transmitting Antenna Element Antenna 1; 202-Transmitting Antenna Element Antenna 2; 203-Transmitting Antenna Element Antenna 3; 204-Transmitting Antenna Element Antenna 4; 205-Receiver Antenna Element Antenna 1; 206-Receiver Antenna Element Antenna 2; 207-Receiver Antenna Element Antenna Patch 3; 208-Receiver Antenna Element Antenna 4; 209-Radiating Patch; 2091-Rectangular Slot; 2010-Metallic Ground; 2011-Circular Slot; 2012-Microstrip Line; 2013-Feed Via; 3-Dielectric Board; 301-Dielectric Board 1; 302-Dielectric Board 2; 303-Dielectric Board 3; 4-Transmitting Antenna; 5-Receiver Antenna. Detailed Implementation

[0030] The technical solution will be further described below with reference to the accompanying drawings.

[0031] Example: Figures 3-4 As shown, the microstrip antenna for ultra-wideband radar transceiver includes a transmitting antenna 4, a receiving antenna 5, and a dielectric substrate 3. The receiving antenna 5 and the transmitting antenna 4 are both mounted on the dielectric substrate 3. The receiving antenna 5 and the transmitting antenna 4 have the same structure, are mounted on the same dielectric substrate 3, and are spaced apart by one wavelength. The dielectric substrate 3 is an FR4 material with a thickness of 1.6 mm. The radiating sheet 209 has a length and width of 8.5 mm. The spacing between each unit antenna 2 is 22.2 mm. The transmitting antenna 4 and the receiving antenna 5 are spaced apart by 46 mm.

[0032] The dielectric substrate 3 includes dielectric substrate 1 301, dielectric substrate 2 302, and dielectric substrate 303. The receiving antenna 5 and the transmitting antenna 4 each include a unit antenna 2, a metal ground 2010, and an antenna feed network 1. The metal ground 2010 is located between dielectric substrate 1 301 and dielectric substrate 2 302, and between dielectric substrate 2 302 and dielectric substrate 303. The unit antenna 2 is located on the top layer of dielectric substrate 1 301, and the antenna feed network 1 is located on the bottom layer of dielectric substrate 303.

[0033] like Figure 1 As shown, the unit antenna 2 includes an antenna radiating plate 209, a metal ground 2010, a microstrip line 2012, a circular slot 2011, and a feed via 2013. The antenna radiating plate 209 is electrically connected to the microstrip line 2012 through the feed via 2013, passing through the circular slot 2011. The antenna radiating plate 209 is square, and a rectangular slot 2091 is formed on the antenna radiating plate 209, with the rectangular slot 2091 tilted at 45°.

[0034] like Figure 2 As shown, the antenna feed network 1 includes an input terminal, an output terminal, and an impedance transformation stub. The input terminal is electrically connected to the output terminal through the impedance transformation stub. The antenna radiating plate 209 is electrically connected to the output port of the antenna feed network 1 through the feed via 2013.

[0035] Both the receiving antenna 5 and the transmitting antenna 4 include four element antennas 2, each element antenna 2 spaced half a wavelength apart. The four element antennas of the transmitting antenna 4 are transmitting antenna element 1 201, transmitting antenna element 202, transmitting antenna element 3 203, and transmitting antenna element 4 204. The four element antennas of the receiving antenna are receiving antenna element 1 205, receiving antenna element 2 206, receiving antenna element 3 207, and receiving antenna element 4 208. Correspondingly, the antenna feed network 1 includes four output terminals and four impedance transformation stubs, with the four output terminals electrically connected to the four impedance transformation stubs respectively. Specifically, the antenna feed network 1 includes a transmitting antenna feed network 101 and a receiving antenna feed network 102. The transmitting antenna feed network includes a transmitting antenna feed network output terminal 1011, a transmitting antenna feed network output terminal 1012, a transmitting antenna feed network output terminal 3 1013, a transmitting antenna feed network output terminal 4 1014, and a transmitting antenna feed network input terminal 1015. The receiving antenna feed network includes a receiving antenna feed network output terminal 1021, a receiving antenna feed network output terminal 2 1022, a receiving antenna feed network output terminal 3 1023, a receiving antenna feed network output terminal 4 1024, and a receiving antenna feed network input terminal 1025.

[0036] The microstrip antenna used for ultra-wideband radar transceivers has a center frequency of 7.29 GHz, an impedance bandwidth of less than -10 dB and greater than 1 GHz, a maximum radiation gain of 8.5 dBi, and a 3 dB beamwidth of 26°.

[0037] The onboard ultra-wideband antenna was modeled, simulated, and optimized using ANSYS 2020 software, such as... Figure 5 The S-parameters of the unit antenna are derived from... Figure 5 It can be seen that the reflection coefficient S11 is less than -10dB in the 6.8GHz-7.6GHz range. Figure 6 This is the radiation pattern of a single antenna element. Figure 7 The reflection coefficient at the input port of the power supply network must meet the operating bandwidth requirements. Figure 8 The four output ports of the power supply network are in phase at the center frequency. Figure 9 The figure shows the S-parameters of the ultra-wideband radar transceiver microstrip antenna. The port reflection of the transceiver antenna is less than -8 dB in the 6.5-7.9 GHz range, and the port isolation is less than -26 dB in the 6.5-7.9 GHz range. Figure 10 The diagram shows the radiation pattern of a microstrip antenna for a broadband radar transmitter. It can be seen from the diagram that the maximum antenna gain is 8.5 dBi when Phi = 90°. Figure 11 The diagram shows the radiation pattern of a microstrip antenna for broadband radar reception. It can be seen from the diagram that the maximum antenna gain is 8.8 dBi when Phi = 90°.

[0038] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model, such as changes in the material or size of the dielectric substrate, should be included within the protection scope of this utility model.

Claims

1. A microstrip antenna for ultra-wideband radar transceiver, characterized in that, It includes a transmitting antenna, a receiving antenna, and a dielectric substrate. Both the receiving antenna and the transmitting antenna are disposed on the dielectric substrate. The receiving antenna and the transmitting antenna have the same structure, are disposed on the same dielectric substrate, and are spaced apart by one wavelength.

2. The microstrip antenna for ultra-wideband radar transceiver according to claim 1, characterized in that, The dielectric substrate includes dielectric substrate one, dielectric substrate two, and dielectric substrate three. The receiving antenna and the transmitting antenna each include a unit antenna, a metal ground, and an antenna feed network. The metal ground is located between dielectric substrate one and dielectric substrate two, and between dielectric substrate two and dielectric substrate three. The unit antenna is located on the top layer of dielectric substrate one, and the antenna feed network is located on the bottom layer of dielectric substrate three.

3. The microstrip antenna for ultra-wideband radar transceiver according to claim 2, characterized in that, The unit antenna includes an antenna radiating plate, a metal ground, a microstrip line, a circular slot, and a feed via. The antenna radiating plate is electrically connected to the microstrip line through the feed via and the circular slot.

4. The microstrip antenna for ultra-wideband radar transceiver according to claim 2, characterized in that, The antenna feed network includes an input terminal, an output terminal, and an impedance transformation stub. The input terminal is electrically connected to the output terminal through the impedance transformation stub.

5. The microstrip antenna for ultra-wideband radar transceiver according to claim 3, characterized in that, The antenna radiating plate is electrically connected to the output port of the antenna feed network through the feed via.

6. The microstrip antenna for ultra-wideband radar transceiver according to claim 3, characterized in that, The antenna radiating plate is square, and a rectangular slit is opened on the antenna radiating plate, and the rectangular slit is inclined at 45°.

7. The microstrip antenna for ultra-wideband radar transceiver according to claim 6, characterized in that, Both the receiving antenna and the transmitting antenna include four element antennas, each element antenna being spaced half a wavelength apart.

8. The microstrip antenna for ultra-wideband radar transceiver according to claim 7, characterized in that, The antenna feed network includes four output terminals and four impedance transformation stubs, with the four output terminals electrically connected to the four impedance transformation stubs respectively.

9. The microstrip antenna for ultra-wideband radar transceiver according to claim 7, characterized in that, The dielectric substrate is an FR4 substrate with a thickness of 1.6mm. The length and width of the antenna radiating sheet are both 8.5mm. The spacing between each unit antenna is 22.2mm. The spacing between the transmitting antenna and the receiving antenna is 46mm.

10. The microstrip antenna for ultra-wideband radar transceiver according to claim 7, characterized in that, The microstrip antenna used for ultra-wideband radar transceivers has a center frequency of 7.29 GHz, an impedance bandwidth of less than -10 dB and greater than 1 GHz, a maximum radiation gain of 8.5 dBi, and a 3 dB beamwidth of 26°.

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