CN-122026093-A - Dielectric decoupling antenna based on strip dielectric resonator

CN122026093ACN 122026093 ACN122026093 ACN 122026093ACN-122026093-A

Abstract

The invention discloses a dielectric decoupling antenna based on a strip dielectric resonator, and belongs to the technical field of microwave communication. Aiming at the problems that the mutual coupling of the existing tightly arranged dielectric antenna array is deteriorated, and the traditional decoupling mode needs to add an additional structure to cause the complexity of the antenna or the increase of the section, the invention provides a decoupling antenna scheme with no additional component and low section. The antenna is of a laminated structure and comprises a top layer double-radiation dielectric patch, a middle strip dielectric resonator, a slotted metal ground and a centrally symmetrical L-shaped microstrip feeder line. When the device works, the top layer excites a half-wavelength electric field, the middle resonator excites a full-wavelength electric field, equal-amplitude reverse phase counteracts to form a weak field region, and the feed slot is arranged in the weak field region to realize port decoupling.

Inventors

XU KAI
MEI YUYANG
LI JUNXIAN
FAN MENGYAN
ZHANG JIAYI
SHI JIN
SHAO CHUAN

Assignees

南通大学

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (9)

1. The dielectric decoupling antenna based on the strip-shaped dielectric resonator is characterized by comprising a first dielectric patch layer, a first dielectric substrate, a second dielectric patch layer, a second dielectric substrate, a metal stratum, a third dielectric substrate and a bottom metal layer which are sequentially stacked from top to bottom; The first dielectric patch layer comprises two rectangular dielectric patches which are arranged at intervals along the horizontal direction and serve as radiators of the antenna unit; The second dielectric patch layer is provided with a rectangular dielectric patch which is used as a strip-shaped dielectric resonator, and two rectangular dielectric patches which are positioned right below the first dielectric patch layer and transversely span the first dielectric patch layer; The metal stratum is provided with two rectangular grooves which are used as feed gaps, are respectively and correspondingly arranged below the two rectangular dielectric patches of the first dielectric patch layer and are simultaneously arranged below the rectangular dielectric patches of the second dielectric patch layer; The bottom metal layer is composed of two L-shaped metal microstrip lines which are arranged in a central symmetry mode and used for antenna feed.
2. The dielectric decoupling antenna of claim 1, wherein the rectangular dielectric patches of the first dielectric patch layer have a length of 0.51λ 0 ~0.52λ 0 in the horizontal direction and a width of 0.34 λ 0 ~0.35λ 0 in the vertical direction, and the spacing between the two rectangular dielectric patches is 0.02λ 0 ~0.03λ 0 ,λ 0 being the air wavelength corresponding to the antenna center frequency.
3. The dielectric decoupling antenna of claim 2, wherein the rectangular dielectric patches of the second dielectric patch layer have a length of 0.47 λ 0 ~0.48λ 0 in the horizontal direction and a width of 0.13 λ 0 ~0.14λ 0 in the vertical direction.
4. A dielectric decoupling antenna as claimed in claim 3, wherein the rectangular slots of the metal formation have a length of 0.13 λ 0 ~0.14λ 0 in the vertical direction, a width of 0.01λ 0 ~0.02λ 0 in the horizontal direction, and an edge spacing of 0.25 λ 0 ~0.26λ 0 between the two rectangular slots.
5. The dielectric decoupling antenna of claim 1, wherein the long edges of the L-shaped metal microstrip lines are arranged in a horizontal direction and face the horizontal center line of the rectangular dielectric patch, and the short edges of the two L-shaped metal microstrip lines opposite to each other turn in a positive vertical direction and a negative vertical direction.
6. The dielectric decoupling antenna of claim 5, wherein the L-shaped metal microstrip line has a total length of 1.02λ 0 ~1.03λ 0 and a long side length of 0.91 λ 0 ~0.92λ 0 ,λ 0 as an air wavelength corresponding to a center frequency of the antenna.
7. The dielectric decoupling antenna of any one of claims 1-6, wherein when the antenna is in operation, two rectangular dielectric patches of a first dielectric patch layer excite half-wavelength electric field modes respectively, a strip dielectric resonator of a second dielectric patch layer excites full-wavelength electric field modes, a top half-wavelength electric field is in constant amplitude inversion with a half-side electric field corresponding to a middle layer and counteracts to form a weak field region, and a rectangular slot of the feed slot is positioned in the weak field region to realize decoupling of an antenna port.
8. The dielectric decoupling antenna of any one of claims 1-6, wherein the first dielectric substrate, the second dielectric substrate, and the third dielectric substrate are all RO4003C, and have a thickness of 0.01λ 0 ,λ 0 that is an air wavelength corresponding to a center frequency of the antenna.
9. The dielectric decoupling antenna of any one of claims 1-6, wherein the antenna has an operating center frequency of 4.05ghz, a 10dB impedance matching bandwidth of 2.46%, a maximum operating gain of 7.05dBi, and a port maximum isolation of-50 dB.

Description

Dielectric decoupling antenna based on strip dielectric resonator Technical Field The invention relates to the field of microwave communication, in particular to a dielectric decoupling antenna. Background The dielectric antenna is widely applied in microwave and millimeter wave frequency bands due to the advantages of high efficiency, small volume, easy processing and the like. When a plurality of dielectric antennas form a multi-unit antenna array, the channel capacity and the signal transmission reliability can be improved, and the efficient utilization of spectrum resources is facilitated. Meanwhile, the space between the antenna elements determines the overall size of the multi-element antenna array, and the closely arranged multi-element antenna array is advantageous for miniaturization of the wireless device. However, the mutual coupling between the antenna units generally worsens with the decrease of the array element spacing, and some additional structures are often introduced to solve the mutual coupling problem between the units, which further causes the antenna to become more complex. Therefore, there is a need for a dielectric decoupling antenna that is closely arranged and simple in construction without additional components. The existing decoupling method which can be applied to the closely arranged dielectric antennas has the following three methods. The first is to add a super-surface periodic structure to the media element. The second is to cancel the electric field modes in the medium by cutting or stacking. The third is to introduce additional structure to constrain the propagation path of the electric field in the medium. All three of the above methods basically require additional antenna parasitic structures, elements or networks, which complicate the structure of the antenna. The method without additional structure is easy to cause the antenna section to become high, which is unfavorable for miniaturization of the antenna. Disclosure of Invention Aiming at the prior art, the invention provides a dielectric decoupling antenna based on a strip dielectric resonator, which has the characteristics of simple structure, low profile property and compact arrangement. The dielectric decoupling antenna based on the strip-shaped dielectric resonator comprises a first dielectric patch layer, a first dielectric substrate, a second dielectric patch layer, a second dielectric substrate, a metal stratum, a third dielectric substrate and a bottom metal layer which are sequentially stacked from top to bottom; The first dielectric patch layer comprises two rectangular dielectric patches which are arranged at intervals along the horizontal direction and serve as radiators of the antenna unit; The second dielectric patch layer is provided with a rectangular dielectric patch which is used as a strip-shaped dielectric resonator, and two rectangular dielectric patches which are positioned right below the first dielectric patch layer and transversely span the first dielectric patch layer; The metal stratum is provided with two rectangular grooves which are used as feed gaps, are respectively and correspondingly arranged below the two rectangular dielectric patches of the first dielectric patch layer and are simultaneously arranged below the rectangular dielectric patches of the second dielectric patch layer; The bottom metal layer is composed of two L-shaped metal microstrip lines which are arranged in a central symmetry mode and used for antenna feed. Further, the length of the rectangular dielectric patch of the first dielectric patch layer along the horizontal direction is 0.51λ 0~0.52λ0, the width of the rectangular dielectric patch along the vertical direction is 0.34 λ 0~0.35λ0, and the interval between the two rectangular dielectric patches is 0.02λ 0~0.03λ0,λ0, which is the air wavelength corresponding to the antenna center frequency. Further, the length of the rectangular dielectric patch of the second dielectric patch layer along the horizontal direction is 0.47 lambda 0~0.48λ0, and the width along the vertical direction is 0.13 lambda 0~0.14λ0. Further, the length of the rectangular grooves of the metal stratum in the vertical direction is 0.13 lambda 0~0.14λ0, the width of the rectangular grooves in the horizontal direction is 0.01 lambda 0~0.02λ0, and the edge distance between the two rectangular grooves is 0.25 lambda 0~0.26λ0. Further, the long edges of the L-shaped metal microstrip lines are arranged in the horizontal direction and face to the horizontal center line of the rectangular dielectric patch, and the short edges of the two L-shaped metal microstrip lines, which are opposite, turn towards the vertical positive direction and the vertical negative direction respectively. Further, the total length of the L-shaped metal microstrip line is 1.02λ 0~1.03λ0, and the length of the long side is 0.91 λ 0~0.92λ0,λ0, which is the air wavelength corresponding to the antenna center frequency. Further