Microstrip patch feed dielectric resonator filtering antenna
By designing a microstrip-chip feed dielectric resonator filtering antenna, the isolation deterioration and pattern distortion caused by heterofrequency mutual interference in large-scale 5G antennas are solved, and the wide bandwidth and high gain in the FR2 frequency band are achieved, and the filtering performance and radiation effect of the antenna are improved.
Patent Information
- Application Number
- CN202422165487.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In the 5G large-scale antenna design, the heterofrequency mutual interference of different frequency sub-arrays in the heterofrequency common-diameter antenna array leads to deterioration of antenna isolation, pattern distortion and radiation efficiency, which is difficult to effectively solve in the existing technology.
A microstrip-chip feeding dielectric resonator filter antenna is designed, and a cylindrical dielectric resonator, metal ground surface, dielectric substrate and microstrip line-chip feeding structure is combined with a rectangular groove coupling feeding to excite the antenna radiation unit to achieve selective filtering, covering the n257 and n260 frequency bands, and forming radiation zero points on both sides of the passband.
It realizes 43.5% impedance bandwidth in the FR2 frequency band, with a maximum gain of 6.36dBi, and the cross-polarization in the passband is less than 20dB, effectively suppressing the out-of-band resonance mode and improving the filtering performance and radiation efficiency of the antenna.
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Figure CN223066464U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of antennas for wireless communication, and particularly relates to a dielectric resonator filter antenna fed by a microstrip patch. Background Technique
[0002] With the development of the fifth-generation communication technology, the design of 5G large-scale antennas is required to be compatible with 2G, 3G, and 4G frequency bands to achieve the construction goal of multi-system compatibility. However, different frequency sub-arrays in the heterogenous frequency co-aperture antenna array will face serious heterogenous frequency mutual interference, resulting in problems such as deterioration of antenna isolation, distortion of radiation pattern, and decrease in radiation efficiency. By using the out-of-band suppression function of the filter antenna, the resonant mode of the antenna outside the band can be effectively suppressed, and the distortion of the radiation pattern caused by heterogenous frequency mutual coupling can be alleviated. The dielectric resonator antenna technology is very suitable for designing high-frequency antennas due to its characteristics such as high high-frequency radiation efficiency, large power capacity, small loss, and high design freedom. The dielectric resonator filter antenna has 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 microstrip-patch feeding. The antenna operates in the FR2 frequency band, covering the n257 and n260 frequency bands, achieving an impedance bandwidth of 43.5%, and forming two radiation zeros on both sides of the passband. The antenna has good filtering performance.
[0004] To achieve the above object, the technical solution adopted by the utility model is as follows: The filter antenna is composed of a cylindrical dielectric resonator, a layer of metal ground plane, a layer of dielectric substrate, and a feeding structure composed of a layer of microstrip line and patch. The cylindrical dielectric resonator is a tire-shaped dielectric resonator; the material of the tire-shaped dielectric resonator is Rogers TMM6(tm), with a dielectric constant ε r2 = 6.7, and the material of the dielectric substrate is Rogers RT / duroid 6002(tm), with a dielectric constant ε r3 = 2.94; two rectangular slots are etched on the metal ground plane. The filter antenna is coupled and fed through the microstrip-patch feeding structure and the rectangular slots to excite the antenna radiation unit.
[0005] The advantages of the utility model are: The antenna operates in the FR2 frequency band, covering the n257 and n260 frequency bands, belonging to the 5G millimeter-wave planning frequency band; the antenna is coupled and fed through the microstrip-patch feeding structure and the rectangular slots, introducing two radiation zeros for the antenna, which are 26.74 GHz and 43.50 GHz respectively, achieving selective filtering. The simulated impedance bandwidth with S11 < -10 dB is 43.5% (27.46 - 42.75 GHz); the highest gain of the antenna in the passband is 6.36 dBi. The antenna is in The cross-polarization in this direction is lower than 20 dB, indicating that the antenna radiation effect in this direction is better.
[0006] The small cylinder mentioned refers to a cylinder located at the exact center of the substrate with a radius of R1 = 3.27 mm.
[0007] The microstrip-patch feeding structure mentioned refers to: the length of the microstrip line is L1 = 12 mm, the width is W1 = 1.36 mm, and the characteristic impedance is 50 Ω; the "day"-shaped patch is cascaded at the end of the microstrip line, with the same length and width of p = 6 mm. A pair of rectangular slots with the same size are etched on the patch, with the length and width being sl1 = 3.7 mm and sw1 = 0.7 mm respectively, and the distance from the slot to the edge of the patch is d = 1.8 mm. The metal ground plane is located on the upper surface of the dielectric substrate, and two rectangular slots with different lengths are etched on it: the second rectangular slot located at the center of the ground plane, with a length of sl2 = 1.8 mm and a width of sw2 = 0.6 mm; the first rectangular slot is s = 4.7 mm away from the center of the ground plane, and its length and width are sl3 = 1.2 mm and sw3 = 0.3 mm respectively. Description of the Drawings
[0008] Figure 1 It is a top view of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0009] Figure 2 It is a side view of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0010] Figure 3 It is a schematic diagram of the upper surface of the dielectric substrate of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0011] Figure 4 It is a schematic diagram of the lower surface of the dielectric substrate of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0012] Figure 5 It is a perspective view of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0013] Figure 6 It is an S-parameter simulation result diagram of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0014] Figure 7 It is a gain simulation result diagram of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model.
[0015] Figure 8 It is the radiation pattern of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model at 31.96 GHz.
[0016] Figure 9It is the radiation pattern of a dielectric resonator filter antenna fed by a microstrip patch of the present utility model at 34.24 GHz.
[0017] Figure 10 It is the radiation pattern of a dielectric resonator filter antenna fed by a microstrip patch of the present utility model at 39.88 GHz.
[0018] Figure 11 It is a schematic structural diagram of a dielectric resonator filter antenna fed by a microstrip patch of the present utility model. Specific embodiments
[0019] The present utility model will be further described in detail below with reference to the accompanying drawings of the specification.
[0020] As Figure 1 shown, the cylindrical dielectric resonator (101) is composed of two parts: a cylinder with a dielectric constant of ε r2 = 6.7, a loss tangent value of 0.0023, a radius and a height of R1 = 0.337 mm and H2 = 1.88 mm respectively is in the middle of the dielectric substrate, and a rectangular block is located on the horizontal axis.
[0021] As Figure 2 shown, the metal ground plane (201) is placed on the upper surface of the dielectric substrate (202). The length G of the dielectric substrate (202) is 30 mm, the height H1 is 0.508 mm, and the dielectric constant ε r2 = 6.7; the height H2 of the cylindrical dielectric resonator (101) is 1.88 mm.
[0022] As Figure 3 shown, a first rectangular groove (301) and a second rectangular groove (302) are etched on the metal ground plane (201). The second rectangular groove (302) is used to excite the cylindrical dielectric resonator (101) to improve the out-of-band rejection; the first rectangular groove (301) is used to increase the antenna bandwidth. The length sl2 of the second rectangular groove (302) is 1.8 mm, the width sw2 is 0.6 mm, the length sl3 of the first rectangular groove (301) is 1.2 mm, the width sw3 is 0.3 mm, which are symmetric about the horizontal axis, and the interval s is 4.7 mm; the length and width of the metal ground plane (201) are the same as those of the dielectric substrate (202), and the length G is 30 mm.
[0023] As Figure 4As shown, the microstrip-patch feeding structure (401) is placed on the lower surface of the dielectric substrate (202). The "day"-shaped patch cascaded with the microstrip line in the microstrip-patch feeding structure (401) is located at the exact center of the dielectric substrate (202). Among them, the width W1 of the microstrip line is 1.36 mm and the length L1 is 12 mm; the length and width of the "day"-shaped patch are the same, P = 6 mm. A pair of rectangular slots with the same size are etched on the patch, with the length sl1 = 3.7 mm and the width sw1 = 0.7 mm, and the distance from the slot to the edge of the patch is d = 1.8 mm.
[0024] As Figure 5 shown, a perspective view of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model. The antenna includes a cylindrical dielectric resonator (101) on the uppermost layer, a metal ground plane (201) with a first rectangular slot (301) and a second rectangular slot (302) etched on the upper surface of the dielectric substrate (202), the dielectric substrate (202), and a microstrip-patch feeding structure (401) etched on the lower surface of the dielectric substrate (202).
[0025] As Figure 6 shown, the S-parameter simulation results of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model. The operating frequency band of the antenna reaches 27.46 - 42.75 GHz, and the impedance relative bandwidth is 43.5%.
[0026] As Figure 7 shown, the gain simulation results of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model. The two radiation null points are at 26.74 GHz and 43.50 GHz respectively, achieving selective filtering; the highest gain of the antenna within the passband is 6.36 dBi.
[0027] As Figure 8 shown, the radiation pattern of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model at 31.96 GHz, indicating that the cross polarization of the antenna at is lower than 20 dB, indicating that the radiation effect of the antenna in this direction is better.
[0028] As Figure 9 shown, the radiation pattern of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model at 34.24 GHz, indicating that the cross polarization of the antenna at is lower than 20 dB, indicating that the radiation effect of the antenna in this direction is better.
[0029] As Figure 10 shown, the radiation pattern of a dielectric resonator filter antenna with microstrip-patch feeding according to the present utility model at 39.88 GHz, indicating that the cross polarization of the antenna at The cross polarization is less than 20 dB, indicating that the antenna radiation effect is better in this direction.
[0030] As Figure 11 shown, it is a schematic structural diagram of a dielectric resonator filter antenna fed by a microstrip patch according to the present utility model. The antenna includes, from top to bottom, a dielectric resonator (101), a metal ground plane (201) etched with a first rectangular groove (301) and a second rectangular groove (302), a dielectric substrate (202), and a microstrip-patch feeding structure (401) etched on the lower surface of the dielectric substrate (202).
[0031] The above 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 dielectric resonator filter antenna fed by a microstrip patch, characterized in that The antenna includes: a cylindrical dielectric resonator (101), a metal ground plane (201), a dielectric substrate (202), and a microstrip-patch feeding structure (401), wherein a first rectangular groove (301) and a second rectangular groove (302) are etched on the metal ground plane (201); the first rectangular groove (301) and the second rectangular groove (302) refer to: a first rectangular groove (301) at a distance s = 4.7 mm from the ground center and a second rectangular groove (302) located at the center of the ground plane.
2. The dielectric resonator filter antenna fed by a microstrip patch according to claim 1, characterized in that The described microstrip-patch feeding structure (401) is formed by cascading a microstrip line with a width W1 = 1.36 mm with a "day"-shaped patch with a length p = 6 mm and a width d = 1.8 mm, and the patch is located at the center of the dielectric substrate.
3. A dielectric resonator filter antenna fed by a microstrip patch, characterized in that, The material of the dielectric substrate (202) is Rogers RT / duroid 6002(tm), the substrate has a length and width of G = 30 mm and a height of H1 = 0.508 mm; the material of the cylindrical dielectric resonator (101) is Rogers TMM6(tm), where the radius of the dielectric resonator is R1 = 3.37 mm and the height is H2 = 1.88 mm, and the following metal ground plane (201) has a length and width of G = 30 mm each.
4. A dielectric resonator filter antenna fed by a microstrip patch, characterized in that, The upper surface of the dielectric substrate (202) is the metal ground plane (201); the lower surface is the microstrip-patch feeding structure (401); the cylindrical dielectric resonator (101) is directly above the second rectangular groove (302) at the center of the ground plane; the cylindrical dielectric resonator (101) is coupled and excited by the microstrip-patch feeding structure (401) and the second rectangular groove (302), and the designed antenna operates in the FR2 frequency band, covering the n257 and n260 frequency bands, achieving an impedance bandwidth of 43.5%, forming two radiation nulls on both sides of the passband, and the highest gain in the band is 6.36 dBi.