A broadband high-pass filtering antenna based on SIW and an antenna array

Abstract

The application provides a wideband high-pass filtering antenna based on SIW and an antenna array, which comprises a printed floor, a radiator, a transmission line and a metal reflecting floor, the printed floor, the radiator and the transmission line are arranged on a circuit board, and the metal reflecting floor supports and fixes the circuit board; wherein the printed floor comprises two printed floor parts formed on two surfaces of the circuit board respectively; the radiator comprises two conductive sheets formed in the middle layer of the circuit board and a balun composed of two slots formed on the two printed floor parts respectively; and the transmission line comprises a strip line formed in the middle layer of the circuit board, an SIW, a strip line and a microstrip line formed on one surface of the circuit board. The application is beneficial to miniaturization of a radio frequency front end and improvement of matching performance of the radio frequency front end.

Description

TECHNICAL FIELD

[0001] The present application relates to microwave functional devices and antennas in the field of satellite communication and microwave wireless communication. In particular, it relates to a broadband high-pass filtering antenna. BACKGROUND

[0002] With the rapid development of microwave wireless technology, communication systems are developing towards miniaturization, integration and multi-functionality. Due to the demand for mobility and miniaturization, the radio frequency front end often needs to have good polarization characteristics, high gain, strong directivity, small size and light weight. In the traditional design method, the filter and the antenna are always designed separately and then cascaded to work when needed. This makes the radio frequency front end large in size, heavy in weight, complex in structure and poor in matching performance, which deteriorates the working performance of the radio frequency front end.

[0003] In the information age, humans are not satisfied with obtaining information in fixed places, but can obtain information in moving vehicles, ships and airplanes. Phased array antennas are developed on the basis of array antennas, and their advantages are fast scanning speed, flexible beam control, and the ability to search and track satellite signals on mobile carriers. With the rapid development of satellite communication technology, the reduction of the cost of phased array antennas and the simplification of the structure for easy installation and durability have become an important issue in satellite communication technology. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a broadband high-pass filtering antenna based on SIW, which is beneficial to the miniaturization of the radio frequency front end and the improvement of the matching performance of the radio frequency front end, in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present application to solve the technical problem comprises: providing a broadband high-pass filtering antenna based on SIW, comprising: a printed ground plane, a radiator, a transmission line and a metal reflection ground plane, the printed ground plane, the radiator and the transmission line being arranged on a circuit board, and the metal reflection ground plane supporting and fixing the circuit board and reflecting the electromagnetic waves radiated by the radiator; wherein the printed ground plane comprises two printed ground plane parts formed on two surfaces of the circuit board respectively; the radiator comprises two conductive sheets formed in the middle layer of the circuit board and a balun composed of two slots formed on the two printed ground plane parts respectively; and the transmission line comprises a strip line, an SIW, a strip line formed in the middle layer of the circuit board and a microstrip line formed on one surface of the circuit board.

[0006] In some embodiments, the two printed ground plane parts are connected by a plurality of conductive holes.

[0007] In some embodiments, the strip line, the SIW, the strip line and the microstrip line of the transmission line form a high-pass filter.

[0008] In some embodiments, one of the two conductive sheets is connected to the stripline of the transmission line; the other of the two conductive sheets is connected to the printed floor through a conductive hole.

[0009] In some embodiments, the circuit board is a multi-layer PCB board or a LTCC ceramic board.

[0010] In some embodiments, the height of the antenna is an integer multiple of 1 / 2 working wavelength.

[0011] The technical scheme adopted by the present application to solve its technical problems further comprises: providing a wideband high-pass filtering antenna array based on SIW, comprising a plurality of aforementioned antennas constituting an array.

[0012] In some embodiments, the plurality of antennas share the same metal reflecting floor.

[0013] Compared with the prior art, the wideband high-pass filtering antenna and antenna array based on SIW of the present application, by forming a printed floor, a radiator and a transmission line on a circuit board, and then clamping and fixing the circuit board through a metal reflecting floor, is conducive to cascading and integrating a wideband antenna and a high-pass filter in one, miniaturizing the entire radio frequency front end, and stabilizing impedance matching. In addition, by printing a plurality of filtering antennas on a long circuit board to form a linear array, the linear array can also be used as an array unit to form an antenna array with an arbitrary number of units on a large metal reflecting floor. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a combined structure diagram of the wideband high-pass filtering antenna based on SIW of the present application.

[0015] Figure 2 is a combined perspective diagram of the structure on the circuit board in the antenna of the present application.

[0016] Figure 3 is a combined perspective diagram of the structure on the circuit board in the antenna of the present application.

[0017] Figure 4 is an exploded diagram of the structure on the circuit board in the antenna of the present application.

[0018] Figure 5 is a combined structure diagram of the wideband high-pass filtering antenna array based on SIW of the present application.

[0019] Figure 6 is a standing wave ratio curve diagram of the antenna array of the present application.

[0020] Figure 7 is a gain and frequency curve diagram of the antenna of the present application.

[0021] Wherein, the reference signs are explained as follows: 100 antenna array 40 metal reflection floor 50 circuit board 10 antenna 1 printed floor 11, 12 printed floor part 2 radiator 21, 22 conductive sheet 23, 24 slot 3 transmission line 31 strip line 32 SIW 33 strip line 34 microstrip line 4 metal reflection floor 5 circuit board 51 first surface 52 second surface 53 intermediate layer 54 conductive hole. DETAILED DESCRIPTION

[0022] In order to explain the structure and characteristics of the present application, the following preferred embodiments are described below with reference to the accompanying drawings.

[0023] Referring to Figures 1 to 4 , Figure 1 is a combination structure schematic of the SIW-based wideband high-pass filtering antenna of the present application. Figure 2 is a combination perspective schematic of the structure on the circuit board in the antenna of the present application. Figure 3 is a combination perspective schematic of the structure on the circuit board in the antenna of the present application. Figure 4 is an exploded schematic of the structure on the circuit board in the antenna of the present application. The present application proposes a SIW-based wideband high-pass filtering antenna 10, comprising: a printed floor 1, a radiator 2, a transmission line 3 and a metal reflection floor 4. Wherein, the printed floor 1, the radiator 2 and the transmission line 3 are arranged on a circuit board 5.

[0024] Specifically, the circuit board 5 is a multi-layer PCB board or a LTCC (low temperature co-fired) ceramic board. The metal reflection floor 4 supports and fixes the circuit board 5, and reflects the electromagnetic wave radiated by the radiator 2. For example, the metal reflection floor 4 clamps the circuit board 5 from both sides in the direction perpendicular to the circuit board 5. The height of the antenna 10 is an integer multiple of 1 / 2 working wavelength. The antenna 10 is suitable for periodic radiation propagation.

[0025] The printed floor 1 is mainly formed by the copper structure of the two surfaces 51, 52 of the circuit board 5. The printed floor 1 is in conduction with the metal reflection floor 4.

[0026] Specifically, the printed floor 1 comprises two printed floor parts 11, 12 formed on the two surfaces 51, 52 respectively, and a plurality of conductive holes 54 for connecting the two printed floor parts 11 and 12.

[0027] The radiator 2 is mainly formed by the copper structure of the intermediate layer 53 of the circuit board 5 and the slot structure arranged on the printed floor 1.

[0028] Specifically, the radiator 2 includes: the conductive patches 21, 22 formed on the middle layer 53, two slots 23, 24 formed on the printed floor parts 11, 12 respectively, and a plurality of conductive holes 54 for connecting the conductive patch 22 and the printed floor part 12. The two conductive patches 21, 22 constitute a radiating patch, and the two slots 23, 24 constitute a balun.

[0029] The transmission line 3 is mainly formed by the copper-clad structure of the middle layer 53 and the copper-clad structures of the two surfaces 51, 52.

[0030] Specifically, the transmission line 3 includes: a stripline 31, a SIW 32, a stripline 33 formed on the middle layer 53, and a microstrip line 34 formed on one surface 51. It is worth mentioning that the stripline 31, the SIW 32, the stripline 33, and the microstrip line 34 of the transmission line 3 constitute a high-pass filter. The conductive patch 21 is connected to the stripline 31 of the transmission line 3; and the conductive patch 22 is connected to the printed floor 1 through the conductive hole 54.

[0031] In combination with Figure 5 , Figure 6 and Figure 7 , Figure 5 is a combined structure diagram of the SIW-based wideband high-pass filtering antenna array of the present application. Figure 6 is an antenna return loss curve diagram of the antenna of the present application. Figure 7 is a gain and frequency curve diagram of the antenna of the present application. In one specific embodiment, the antenna array 100 is a typical application of the array of the aforementioned antenna 10. The combined array structure is simple and compact, has strong versatility, is easy to implement, greatly reduces the cost, and is suitable for large phased array antennas.

[0032] The beneficial effects of the SIW-based wideband high-pass filtering antenna 10 and the antenna array 100 of the present application include but are not limited to: by forming the printed floor 1, the radiator 2, and the transmission line 3 on the circuit board 5, and then clamping and fixing the circuit board 5 by the metal reflecting floor 4, it is beneficial to cascade and integrate the wideband antenna and the high-pass filter into one body, miniaturize the entire radio frequency front end, and make the impedance matching more stable. In addition, by printing a plurality of filtering antennas on the long circuit board 50 to form a linear array, it is also beneficial to use the linear array as an array unit to form an antenna array with an arbitrary number of units on a large metal reflecting floor 40.

[0033] The above is only a preferred embodiment of the present application, which is intended to further illustrate the present application, but not to limit it. Any simple replacement according to the above description and drawings is within the scope of protection of the present patent.

Claims

1. A SIW-based wideband high-pass filtering antenna, characterized in that, The antenna (10) comprises: a printed floor (1), a radiator (2), a transmission line (3) and a metal reflecting floor (4), the printed floor (1), the radiator (2) and the transmission line (3) being arranged on a circuit board (5), the metal reflecting floor (4) supporting and fixing the circuit board (5) and reflecting electromagnetic waves radiated by the radiator (2); the circuit board (5) is of a three-layer structure and comprises a first surface (51), a second surface (52) and an intermediate layer (53); wherein the printed floor (1) comprises two printed floor portions (11, 12) formed on the two surfaces (51, 52) of the circuit board (5) respectively; the two printed floor portions (11, 12) are communicated through a plurality of conductive holes (54); the radiator (2) comprises two conductive sheets (21, 22) formed on the intermediate layer (53) of the circuit board (5) and a balun composed of two slots (23, 24) formed on the two printed floor portions (11, 12) respectively; the transmission line (3) comprises a first strip line (31), a SIW (32), a second strip line (33) formed on the intermediate layer (53) of the circuit board (5) and a microstrip line (34) formed on the first surface (51) of the circuit board (5); the first strip line (31) and the second strip line (33) are communicated through the SIW (32); the first strip line (31), the SIW (32), the second strip line (33) and the microstrip line (34) of the transmission line (3) constitute a high-pass filter; one of the two conductive sheets (21, 22) is connected with the first strip line (31) of the transmission line (3); the other of the two conductive sheets (21, 22) is connected with the printed floor (1) through the conductive hole (54).

2. The SIW-based wideband high-pass filtering antenna according to claim 1, wherein: The circuit board (5) is a multi-layer PCB board or a LTCC ceramic board.

3. The SIW-based wideband high-pass filtering antenna according to claim 1, wherein: The height of the antenna (10) is an integer multiple of 1 / 2 working wavelength.

4. A SIW-based wideband high-pass filtering antenna array, characterized in that: The plurality of antennas (10) constitute an array.

5. The SIW-based wideband high-pass filtering antenna array of claim 4, wherein: The plurality of antennas (10) share the same metal reflecting floor (40).

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