CN-122026106-A - Broadband dielectric resonator antenna

CN122026106ACN 122026106 ACN122026106 ACN 122026106ACN-122026106-A

Abstract

The invention discloses a broadband dielectric resonator antenna, which relates to the technical field of wireless communication and comprises a dielectric substrate, a metal floor, a dielectric resonator, a feed network and at least one metal patch, wherein the metal floor is arranged on a first surface of the dielectric substrate and is provided with at least one coupling groove, the dielectric resonator is arranged above the metal floor and is positioned above the coupling groove, the feed network is arranged on a second surface of the dielectric substrate and is used for feeding the dielectric resonator through the coupling groove, and the metal patch is arranged on the outer surface of the dielectric resonator and is used for exciting an additional resonance mode and fusing with an intrinsic resonance mode of the dielectric resonator to expand impedance bandwidth. According to the invention, the non-uniform boundary condition is constructed through the metal patch, so that the internal electric field of the dielectric resonator is split into two modes with adjacent resonant frequencies, and bandwidth fusion is realized, and the dielectric resonator has the advantages of wide bandwidth, independent multi-mode regulation and control, high processing fault tolerance and strong platform universality.

Inventors

WANG YING
LIU YANTING
LI ZAN
SI JIANGBO

Assignees

西安电子科技大学

Dates

Publication Date: 20260512
Application Date: 20260228

Claims (10)

1. A wideband dielectric resonator antenna, comprising: A dielectric substrate; the metal floor is arranged on the first surface of the dielectric substrate, and one or more coupling grooves are formed in the metal floor; The dielectric resonator is arranged on the upper surface of the metal floor and is positioned above the coupling groove; a feeding network, which is arranged on the second surface of the dielectric substrate and is used for feeding power to the dielectric resonator through the coupling groove; and at least one metal patch arranged on the outer surface of the dielectric resonator and used for exciting an additional resonance mode in the dielectric resonator, wherein the additional resonance mode is fused with an intrinsic resonance mode of the dielectric resonator to expand the impedance bandwidth.
2. The wideband dielectric resonator antenna of claim 1, wherein the bottom surface of the dielectric resonator is in direct contact with the first surface of the dielectric substrate through the exposed area of the coupling slot.
3. The wideband dielectric resonator antenna of claim 1, wherein the number of coupling slots is one, the coupling slots being located directly below the dielectric resonator.
4. The wideband dielectric resonator antenna of claim 1, wherein the number of coupling slots is a plurality, the coupling slots including one center coupling slot and two offset coupling slots; the center coupling groove is positioned right below the dielectric resonator, and the two offset coupling grooves are symmetrically arranged on two sides of the center coupling groove and are parallel to the center coupling groove; the bottom surface of the dielectric resonator covers at least a portion of the exposed area of the offset coupling groove.
5. The wideband dielectric resonator antenna of claim 1, wherein the dielectric resonator is any one of a rectangular dielectric resonator or a cylindrical dielectric resonator.
6. The wideband dielectric resonator antenna of claim 5, wherein two of the metal patches are disposed on two opposite sidewall surfaces of the rectangular dielectric resonator, and wherein the two metal patches are symmetrically arranged.
7. The wideband dielectric resonator antenna of claim 5, wherein the metal patch is completely attached to the side wall surface of the rectangular dielectric resonator, the metal patch has a height smaller than the height of the rectangular dielectric resonator, and the lower edge of the metal patch has a predetermined distance from the bottom surface of the rectangular dielectric resonator.
8. The wideband dielectric resonator antenna of claim 1, wherein the additional resonant modes are excited by non-uniform boundary conditions established by the metallic patch at the outer surface of the dielectric resonator; The non-uniform boundary condition enables the internal electric field distribution of the dielectric resonator to be split into two resonance modes, the resonance frequencies of the two resonance modes are respectively located on two sides of the intrinsic resonance frequency of the dielectric resonator, and the impedance bandwidths of the two resonance modes are partially overlapped.
9. The wideband dielectric resonator antenna of claim 1, wherein the feed network includes a microstrip feed line disposed on the second surface of the dielectric substrate, one end of the microstrip feed line extending to an edge region of the coupling slot and forming an open stub structure for exciting the dielectric resonator by electromagnetic coupling.
10. The wideband dielectric resonator antenna of claim 1, wherein the geometric parameters of the metallic patches are independently adjusted for tuning the resonant frequency and quality factor of the additional resonant mode, and wherein the adjustment of the additional resonant mode is independent of the structural parameters of the feed network and the coupling slot.

Description

Broadband dielectric resonator antenna Technical Field The invention belongs to the technical field of wireless communication, and particularly relates to a broadband dielectric resonator antenna. Background With the continuous increase of data transmission rate and spectral efficiency requirements of the fifth generation mobile communication and future wireless communication systems, the broadband has become one of the core trends of the antenna technology development. Dielectric resonator antennas (DIELECTRIC RESONATOR ANTENNA, DRA) have been widely focused in base station communications, satellite navigation, and millimeter wave systems because of their high radiation efficiency, low conductor loss, flexible design, and the like. However, conventional dielectric resonator antennas are limited to a single resonant mode, and their impedance bandwidth is generally narrow, so that it is difficult to cover the operating frequency band required by modern communication systems, which becomes a key bottleneck limiting engineering applications. In order to expand the working bandwidth of the dielectric resonator antenna, the prior art proposes a wideband filtering dielectric resonator antenna scheme based on a dual-mode slot line resonator. According to the scheme, a vertical main slot line and a horizontal coupling slot line are etched on a ground plane to form a dual-mode slot line resonator to replace a traditional microstrip-slot line coupling feed structure, and a three-mode resonance superposition is formed in a target frequency band by utilizing an odd mode and an even mode of the slot line resonator to cooperate with a TE 111 mode intrinsic to a dielectric resonator, so that broadband response is realized. Meanwhile, the scheme introduces a barbed wire structure at the tail end of the microstrip feeder to generate a high-frequency radiation zero point, so that the out-of-band suppression characteristic is improved. However, the prior art described above still has significant drawbacks in practical engineering applications. Firstly, the geometric dimension of the dual-mode slot line resonator is extremely sensitive to the processing precision, and the deviation of 0.2 millimeter width slot line in the etching process of the printed circuit board is +/-0.02 millimeter, so that the odd mode resonant frequency deviation exceeds 100 MHz, and the manufacturing yield is difficult to guarantee. And secondly, strong electromagnetic coupling exists among the odd mode, the even mode and the intrinsic mode of the dielectric resonator of the slot line, the resonant frequencies, the quality factors and the coupling strengths of a plurality of modes are disturbed simultaneously by the adjustment of a single structural parameter, the design freedom degree is highly non-orthogonal, the repeated iterative simulation is needed to carry out multi-parameter collaborative optimization, the design period is long, and the local optimization is easy to fall into. In addition, the scheme is highly dependent on a slot line feed architecture, when the shape of the dielectric resonator is changed from a rectangular shape to a cylindrical shape or a hemispherical shape, the whole feed network needs to be reconstructed, and the platform universality is poor. Disclosure of Invention In order to solve the above problems in the prior art, the present invention provides a wideband dielectric resonator antenna. The technical problems to be solved by the invention are realized by the following technical scheme: The invention provides a broadband dielectric resonator antenna, comprising: A dielectric substrate; the metal floor is arranged on the first surface of the dielectric substrate, and one or more coupling grooves are formed in the metal floor; The dielectric resonator is arranged on the upper surface of the metal floor and is positioned above the coupling groove; a feeding network, which is arranged on the second surface of the dielectric substrate and is used for feeding power to the dielectric resonator through the coupling groove; and at least one metal patch arranged on the outer surface of the dielectric resonator and used for exciting an additional resonance mode in the dielectric resonator, wherein the additional resonance mode is fused with an intrinsic resonance mode of the dielectric resonator to expand the impedance bandwidth. Compared with the prior art, the invention has the beneficial effects that: 1. According to the wideband dielectric resonator antenna, the metal patch is arranged on the outer surface of the dielectric resonator, the additional resonant mode is excited by constructing the non-uniform boundary condition, so that the internal electric field distribution of the dielectric resonator is split into two resonant modes with adjacent resonant frequencies, the impedance bandwidths of the two resonant modes are partially overlapped to form continuous wideband response, the impedance bandwidth is obviously expande