SIW filtering antenna based on U-shaped groove structure

Abstract

The utility model designs an SIW filtering antenna based on a U-shaped groove structure, and the antenna comprises a dielectric substrate, a U-shaped groove is etched at the right center position, and an upper metal surface of a rectangular cut corner is cut off from the edge of a metal surface right above the U-shaped groove; the position of the coaxial feed structure is in the center of the substrate, the antenna feeds through a coaxial line, a U-shaped groove is loaded through the SIW resonant cavity, a corner is cut on the upper surface of metal to obtain high gain, and a filtering effect is generated. According to the utility model, the filtering antenna with high gain and compact structure is constructed by using only one layer of SIW resonant cavity, and the filtering antenna has good practicability. The working frequency band of the designed filtering antenna reaches 4.5 GHz-4. 7 GHz, the impedance relative bandwidth is 4.3%, the positions of 4.27 GHz and 5.19 GHz on the two sides of an antenna passband are each provided with a radiation zero point, the positions of the two radiation zero points are both-25dBi, and it is indicated that the antenna achieves the good filtering effect. And the maximum value of the gain in the passband is 8dBi. The filtering antenna realizes a good filtering effect in the Sub-6GHz frequency band of a 5G communication system, and has application value.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas in wireless communication systems, and designs a SIW filtering antenna based on a U-shaped groove structure. Background Technique

[0002] Nowadays, the focus of the development of communication technology is more suitable for the current users. However, at present, 2G, 3G, and 4G are still in operation, and the use of frequency bands such as WIFI and Zigbee has led to a very complex and compact frequency band division within the frequency range of 0-6 GHz. Therefore, at the transmitting end, an antenna with filtering function is required to meet the high integration requirements of current 5G communication. The SIW technology combines the advantages of microstrip lines and waveguides, has advantages such as high quality factor, easy integration, low loss, and low manufacturing cost, and thus has developed rapidly. The core concept of this technology is to integrate the waveguide structure on the dielectric substrate, and through this structure, the disadvantages of microstrip lines in the high-frequency working state have been successfully overcome. Summary of the Invention

[0003] The utility model designs a SIW filtering antenna based on a U-shaped groove structure. The designed filtering antenna has a working frequency band reaching 4.5 GHz - 4.7 GHz, an impedance relative bandwidth of 4.3%, and there is a radiation zero at each of 4.27 GHz and 5.19 GHz on both sides of the antenna passband, and the positions of the two radiation zeros are both at -25 dBi, indicating that the antenna achieves a good filtering effect. The maximum gain within the passband is 8 dBi.

[0004] To achieve the above object, the technical solution adopted by the utility model is as follows: This filtering antenna is a common form of SIW cavity slot antenna, which consists of a dielectric substrate, upper and lower metal surfaces, and a SIW resonator. The dielectric substrate material uses Rogers 5880 with ε = 2.2 and tanδ = 0.0009. The antenna is fed by a coaxial cable, and the position of the coaxial feeding structure is at the center of the substrate. The SIW resonator is nested with the substrate. A U-shaped groove slot is etched at the center of one metal surface of the SIW resonator, and a rectangular cut corner is cut off at the edge of the metal surface directly above the corresponding position of the U-shaped groove slot.

[0005] The advantages of the utility model are: This antenna is fed by a coaxial cable, and a higher gain is obtained by loading a U-shaped groove slot in the SIW resonator and cutting a corner on the upper metal surface to produce a filtering effect; there is a radiation zero at each of 4.27 GHz and 5.19 GHz on both sides of the antenna passband, and the positions of the two radiation zeros are both at -25 dBi; the maximum gain within the passband is 8 dBi.

[0006] The described rectangular chamfer means that a rectangular chamfer with a length of s3 = 25 mm and a width of s4 = 5.58 mm is cut off from the edge of the upper metal surface.

[0007] The described SIW resonator means that the diameter of the metal posts forming the SIW resonator is d = 3 mm, the distance between the centers of two adjacent metal posts is p = 4.5 mm, the cavity width is l1 = 36 mm, and the length is l2 = 72 mm.

[0008] The described U-shaped groove means that a U-shaped groove with a length of s1 = 33 mm, a width of s2 = 17.7 mm, and a gap width of w 1＝ 2.5 mm is etched at the center of the upper metal surface of the SIW resonator.

[0009] The position of the described coaxial feeding structure: at the center of the substrate. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0011] Figure 2 It is a side view of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0012] Figure 3 It is a top view of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0013] Figure 4 It is a schematic diagram of the upper surface of the dielectric substrate of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0014] Figure 5 It is a schematic diagram of the lower surface of the dielectric substrate of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0015] Figure 6 It is a perspective view of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0016] Figure 7 It is an S-parameter simulation result diagram of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model.

[0017] Figure 8 It is a gain simulation result diagram of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model. Specific Embodiment

[0018] The following further describes the present utility model in detail with reference to the accompanying drawings of the specification.

[0019] As shown Figure 1 in the figure, a SIW filter antenna based on a U-shaped groove structure of the present utility model has a metal surface (201) on the upper surface of a dielectric substrate (101), and a metal ground plane (202) at the lowermost layer. A U-shaped groove (301) is etched at the exact center position on the upper metal surface (201), and a rectangular cut corner is removed from the edge of the metal surface directly above the U-shaped groove (301); the position of the coaxial feeding structure (501) is at the exact center of the substrate, and a SIW resonator (401) is nested in the dielectric substrate (101).

[0020] As shown Figure 2 in the figure, on the dielectric substrate (101) is a metal surface (201), and a U-shaped groove (301) is etched on the upper metal surface (201). The U-shaped groove (301) is located at the exact center of the substrate, with a length of 33 mm, a width of 17.7 mm, and a slot width of 2.5 mm. A rectangular cut corner is removed from the edge of the metal surface directly above the U-shaped groove (301).

[0021] As shown Figure 3 in the figure, the upper metal surface (201) is placed on the upper surface of the dielectric substrate (101). The dielectric substrate (101) is made of Rogers 5880 with ε = 2.2, tanδ = 0.0009, a thickness of h = 2.1 mm, and a size of a*a = 105 mm * 105 mm. The SIW resonator (401) is nested on the dielectric substrate (101), the diameter of the metal posts is d = 3 mm, the distance between the centers of two adjacent metal posts is p = 4.5 mm, the width of the cavity is l1 = 36 mm, and the length is l2 = 72 mm.

[0022] As shown Figure 4 in the figure, a U-shaped groove (301) is etched on the upper metal surface (201). The U-shaped groove (301) is located at the exact center of the substrate, with a length of s1 = 33 mm, a width of s2 = 17.7 mm, and a slot width of w1 = 2.5 mm. A rectangular cut corner with a length of s3 = 25 mm and a width of s4 = 5.58 mm is removed from the edge of the metal surface directly above the U-shaped groove (301).

[0023] As shown Figure 5 in the figure, the coaxial feeding structure (401) is placed on the lower surface of the dielectric substrate (101), the inner radius of the coaxial is r 1＝ 0.5 mm, and the outer radius is r2 = 2 mm.

[0024] As shown Figure 6 in the figure, a perspective view of a coupled-feed nested cylindrical dielectric resonator filter antenna of the present utility model. The antenna includes a metal surface (201), a U-shaped groove (301), a dielectric substrate (101), a SIW resonator (401), and a coaxial feeding structure (501).

[0025] As shown Figure 7 in the figure, the S-parameter simulation results of a SIW filter antenna based on a U-shaped groove structure of the present utility model are presented. The operating frequency band of this antenna reaches 4.5 GHz - 4.7 GHz, and the impedance relative bandwidth is 4.3%. A good filtering effect is achieved in the Sub-6 GHz frequency band of the 5G communication system, which has application value.

[0026] As shown Figure 8 in the figure, the gain simulation results of a SIW filter antenna based on a U-shaped groove structure of the present utility model are presented. There is a radiation null at 4.27 GHz and 5.19 GHz on both sides of the antenna passband, and the positions of both radiation nulls are at -25 dBi, indicating that the antenna has achieved a good filtering effect. The maximum gain within the passband is 8 dBi.

[0027] The above description is only a specific implementation of the present utility model, and the protection scope of the present utility model should be subject to the protection scope defined by the claims.

Claims

1. A SIW filter antenna based on a U-shaped slot structure, characterized in that: The antenna comprises: a dielectric substrate (101), a metal surface (201), a metal ground plane (202), a SIW resonant cavity (401) and a coaxial feeding structure (501), wherein a U-shaped groove (301) is etched on the upper metal surface (201); The upper metal surface (201) has a rectangular cut corner with a length of s3 = 25 mm and a width of s4 = 5.58 mm cut off at the edge of the metal surface just above the U-shaped groove (301); The U-shaped groove (301) means that a U-shaped groove gap is etched in the center of the metal surface on the SIW resonant cavity; The SIW resonant cavity (401) is nested on a dielectric substrate (101), the diameter of the metal column is d=3 mm, the distance between the centers of two adjacent metal columns is p=4.5 mm, the cavity width is l1==36 mm, and the length is l2=72 mm; The coaxial feeding structure (501) is located at the exact center of the substrate, with an inner radius of r1=0.5 mm and an outer radius of r2=2 mm.

2. The SIW filter antenna based on a U-shaped slot structure according to claim 1, characterized in that: A U-shaped groove (301) is etched on the upper metal surface (201). The U-shaped groove (301) is located in the center of the substrate, has a length of s1 = 33 mm, a width of s2 = 17.7 mm, and a gap width of w1 = 2.5 mm.

3. The SIW filtering antenna based on a U-shaped slot structure according to claim 1, characterized in that: The dielectric substrate (101) with a size of a*a=105mm*105mm is made of Rogers 5880.

4. The SIW filter antenna based on a U-shaped slot structure according to claim 1, characterized in that: The upper surface of the dielectric substrate (101) is an upper metal surface (201), a U-shaped groove (301) is etched at the exact center of the upper metal surface (201), and a rectangular corner is cut off at the edge of the metal surface just above the U-shaped groove (301); the coaxial feeding structure (501) is located at the exact center of the substrate, and a higher gain is obtained by loading the U-shaped groove (301) through the SIW resonant cavity (401) and cutting the corner on the metal upper surface, thereby generating a filtering effect.

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