Dielectric resonator filtering antenna based on *-shaped defected ground structure

Abstract

The utility model designs a dielectric resonator filtering antenna based on a *-shaped defected ground structure. The antenna comprises a rectangular dielectric resonator with a special structure, a metal ground plane, a dielectric substrate and a stepped microstrip line. According to the antenna, the stepped microstrip line on the lower surface of the dielectric substrate and the *-shaped defected ground structure on the metal ground plane are coupled and fed, the dielectric resonator is excited, and out-of-band rejection is improved; the rectangular dielectric resonator with a special structure increases the contact range with air, and widens the bandwidth of the antenna. The working frequency band of the designed filtering antenna ranges from 26.43 GHz to 30.22 GHz, the impedance relative bandwidth is 13.4%, two radiation zero points are 24.73 GHz and 31.66 GHz respectively, and the in-band maximum gain is 5.17 dBi. The filtering antenna is simple in structure, small in size, good in filtering characteristic, capable of covering the 5G millimeter wave frequency band n258 and n260 wave bands, and good in application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas in wireless communication systems, and designs a dielectric resonator filtering antenna based on a crisscross defect ground structure. Background Art

[0002] The development of the fifth generation of communication technology requires that the design of 5G large-scale antennas must be compatible with 2G, 3G, and 4G frequency bands to achieve the construction goal of multi-system compatibility. However, with the growing demand for communication technology in society, microwave wireless communication technology is developing in the direction of miniaturization and integration. The out-of-band suppression function of the filter antenna can effectively suppress the out-of-band resonant mode of the antenna and alleviate the directional pattern distortion caused by heterogeneous frequency coupling. Dielectric resonator antenna technology is very suitable for designing high-frequency antennas because of its high high-frequency radiation efficiency, large power capacity, low loss, and high design freedom. Dielectric resonator filter antennas have good application prospects in the 5G millimeter wave band. Summary of the invention

[0003] The utility model designs a dielectric resonator filter antenna based on a cross-shaped defect ground structure. The designed filter antenna has a center frequency of 28.34GHz, an operating frequency band of 26.43GHz-30.22GHz, an impedance relative bandwidth of 13.4%, two radiation zero points outside the passband, respectively at 24.73GHz and 31.66GHz, and most of the in-band gain is around 5dBi, with the highest reaching 5.17dBi.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: the filtering antenna is composed of a rectangular dielectric resonator with a special structure, a dielectric substrate and a stepped microstrip line. The material of the rectangular dielectric resonator with a special structure is Rogers RO3010 (tm), with a dielectric constant of 10.2, and is a residual structure obtained by digging out a rectangular block in the center of the rectangular dielectric resonator to form an embedded air cavity, and cutting off four small rectangular blocks at the top corners around the rectangular dielectric resonator; the material of the dielectric substrate is Rogers RO4003 (tm), with a dielectric constant of 3.38, and three rectangles of different sizes are connected on the lower surface of the dielectric substrate to form a stepped microstrip line structure, which is symmetrical about the vertical axis; a cross-shaped defect ground structure is etched on the metal grounding surface, and the filtering antenna is coupled and fed by the step-shaped microstrip line and the cross-shaped defect ground structure to excite the antenna radiation unit, introduce the air cavity and increase the contact range between the rectangular dielectric resonator and the air, so as to widen the bandwidth.

[0005] The advantages of the utility model are: the working frequency band of the antenna is 26.43GHz-30.22GHz, which belongs to the planned frequency band of 5G millimeter wave; the antenna introduces two radiation zero points for the antenna by changing the shape of the rectangular dielectric resonator, which are at 24.73GHz and 31.66GHz respectively, and the right-side out-of-band suppression is below -10dB, with good filtering characteristics; most of the in-band gain is around 5dBi, and the highest can reach 5.17dBi, which can effectively radiate electromagnetic energy.

[0006] The air cavity is located in the center of the rectangular dielectric resonator and has a length and width of b. 1 =2.5mm, a rectangular block with a height of h=0.813mm.

[0007] The small rectangular block is: a rectangular dielectric resonator with four corners cut off. 2 =1mm, a rectangular block with a height of h=0.813mm.

[0008] The M-shaped defect ground structure refers to: a metal grounding surface with a length of S 1 =10mm, width S 2 =0.35 is obtained by rotating the rectangular groove 45 degrees clockwise.

[0009] The ladder-shaped microstrip line structure is: a length I is used on the lower surface of the dielectric substrate 1 =1.8mm, height I 2 =3.2mm rectangular connection length I 4 =5.4mm, height I 4 =9.5mm rectangle, then connect the length I 6 =1.5mm, height I 5 =1.7mm stepped rectangles. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a schematic structural diagram of a dielectric resonator filter antenna based on a cross-shaped defect ground structure.

[0011] Figure 2 It is a top view of the dielectric resonator filter antenna based on the M-shaped defect ground structure of the utility model.

[0012] Figure 3 It is a side view of the dielectric resonator filtering antenna based on the M-shaped defect ground structure of the utility model.

[0013] Figure 4 It is a schematic diagram of the lower surface of a dielectric substrate of a dielectric resonator filter antenna based on a M-shaped defect ground structure of the utility model.

[0014] Figure 5 The utility model is a schematic diagram of a metal grounding surface on the upper surface of a dielectric substrate of a dielectric resonator filter antenna based on a cross-shaped defect ground structure.

[0015] Figure 6 It is a perspective view of the dielectric resonator filtering antenna based on the M-shaped defect ground structure of the utility model.

[0016] Figure 7 This is a diagram of S-parameter simulation results of the dielectric resonator filter antenna based on the M-shaped defect ground structure of the utility model.

[0017] Figure 8 This is a diagram of the simulation results of the dielectric resonator filter antenna gain based on the M-shaped defect ground structure of the utility model. Specific implementation plan

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 The figure shows a schematic diagram of the structure of a dielectric resonator filter antenna based on a 'M'-shaped defect ground structure of the utility model, comprising a rectangular dielectric resonator (101) of a special structure, a metal ground plane (201), a dielectric substrate (301), a stepped microstrip line (401), and a 'M'-shaped defect ground structure (202) etched on the metal ground plane (201).

[0020] like Figure 2 As shown, the special structure of the rectangular dielectric resonator (101) is made of RogersRO3010(tm) material with a dielectric constant of 10.2; a length and width b is dug out in the center of the rectangular dielectric resonator. 1 =2.5mm, height h=0.813mm rectangular block is introduced into the air cavity, and four lengths and widths b are cut off at the top corners around the rectangular dielectric resonator. 2 =1mm, height h=0.813mm rectangular block to obtain the remaining structure, which increases the contact range between the rectangular dielectric resonator and the air, and is used to increase the antenna bandwidth.

[0021] like Figure 3 As shown, the metal ground plane (201) is placed on the upper surface of the dielectric substrate (301). The dielectric substrate (301) has a length a=25 mm, a height h=0.813 mm, and a dielectric constant of 3.38. The height h of the rectangular dielectric resonator (101) with a special structure is 1 =3mm.

[0022] like Figure 4 As shown, the stepped microstrip line (401) is placed on the lower surface of the dielectric substrate (301) and is symmetrical about the vertical axis. 1 =1.8mm, height I2 =3.2mm rectangular connection length I 4 =5.4mm, height I 3 =9.5mm rectangle, then connect the length I 6 =1.5mm, height I 5 =1.7mm stepped rectangles.

[0023] like Figure 5 As shown, a cross-shaped defect ground structure (202) is etched on the metal ground plane (201), and the cross-shaped defect ground structure (202) is composed of a length S 1 =10mm, width S 2 =0.35mm rectangular slots are rotated 45 degrees clockwise in sequence; the stepped microstrip line (401) and the cross-shaped defect ground structure (202) constitute an effective microstrip line and slot coupling structure, which is used to excite a specially structured rectangular dielectric resonator (101) and improve out-of-band suppression.

[0024] like Figure 6 The utility model is a perspective view of a dielectric resonator filtering antenna based on a 'M'-shaped defect ground structure. The antenna comprises a rectangular dielectric resonator (101) with a special structure on the top layer, a metal grounding surface (201) with a 'M'-shaped defect ground structure (202) etched on the upper surface of a dielectric substrate (301), a dielectric substrate (301), and a stepped microstrip line (401) etched on the lower surface of the dielectric substrate (202).

[0025] like Figure 7 As shown in the figure, the S parameter simulation results of the dielectric resonator filter antenna based on the M-shaped defect ground structure of the utility model. The antenna operates in the frequency band of 26.43GHz-30.22GHz, and the impedance relative bandwidth is 13.4%, which has good application prospects in 5G millimeter waves.

[0026] like Figure 8 As shown in the figure, the simulation results of the gain of the dielectric resonator filter antenna based on the M-shaped defect ground structure of the utility model are shown. The two radiation zero points are at 24.73GHz and 31.66GHz respectively, and the in-band gain is mostly around 5dBi, with the highest reaching 5.17dBi, and the right out-of-band suppression is below -10dB.

[0027] The above description is only a specific implementation scheme of the present utility model, and the protection scope of the present utility model should be based on the protection scope defined in the claims.

Claims

1. A dielectric resonator filter antenna based on a cross-shaped defect structure, characterized in that: The antenna comprises: a rectangular dielectric resonator (101) of a special structure, a metal ground plane (201), a dielectric substrate (301) and a stepped microstrip line (401), wherein a cross-shaped defect ground structure (202) is etched on the metal ground plane (201); the rectangular dielectric resonator (101) of the special structure is a residual structure obtained by digging out a rectangular block at the center of the rectangular dielectric resonator and cutting off four rectangular blocks at the four corners of the rectangular dielectric resonator; the rectangular block refers to: a large rectangular block and four small rectangular blocks, wherein the large rectangular block is located in the center of the rectangular dielectric resonator, and the four cut-off small rectangular blocks are of the same size and are located at the four corners of the rectangular dielectric resonator.

2. The dielectric resonator filter antenna based on the cross-shaped defect structure according to claim 1, characterized in that: The cross-shaped defect ground structure (202) is located at the center of the metal grounding surface and is a structure obtained by rotating a rectangular groove 45 degrees clockwise.

3. The dielectric resonator filter antenna based on the cross-shaped defect structure according to claim 1, characterized in that: The stepped microstrip line (401) is composed of three connected rectangles of different sizes attached to the lower surface of a dielectric substrate and is symmetrical about a vertical axis.

4. The dielectric resonator filter antenna based on the cross-shaped defect structure according to claim 1, characterized in that: The material of the rectangular dielectric resonator (101) with a special structure is Rogers RO3010(tm); and the material of the dielectric substrate (301) is Rogers RO4003(tm).

5. The dielectric resonator filter antenna based on the cross-shaped defect ground structure according to claim 1, characterized in that: The upper surface of the dielectric substrate (301) is a metal ground plane (201), and the lower surface is a stepped microstrip line (401); a 'M'-shaped defect ground structure (202) is etched on the metal ground plane (201); a rectangular dielectric resonator (101) with a special structure is placed directly above the 'M'-shaped defect ground structure (202); the rectangular dielectric resonator (101) with a special structure is excited by coupling of the stepped microstrip line (401) and the 'M'-shaped defect ground structure (202), thereby generating filtering characteristics and improving out-of-band suppression; the antenna has an operating frequency band of 26.43 GHz to 30.22 GHz, and has good application prospects in the millimeter wave band.

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