CN109273858B - Broadband back cavity slot antenna based on dielectric integrated waveguide - Google Patents

Broadband back cavity slot antenna based on dielectric integrated waveguide Download PDF

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Publication number
CN109273858B
CN109273858B CN201811222673.6A CN201811222673A CN109273858B CN 109273858 B CN109273858 B CN 109273858B CN 201811222673 A CN201811222673 A CN 201811222673A CN 109273858 B CN109273858 B CN 109273858B
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metal layer
dielectric
layer
metalized
holes
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CN109273858A (en
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傅佳辉
张志一
梁博秋
赵宇霖
陈晚
吕博
王哲飞
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/106—Microstrip slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors

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Abstract

A broadband back cavity slot antenna based on dielectric integrated waveguide relates to the field of back cavity slot antennas and aims to solve the problems that an existing metal back cavity slot antenna is too high in section, difficult to miniaturize and integrate and high in processing difficulty. The upper surface and the lower surface of the dielectric layer are respectively tightly attached to the upper metal layer and the middle metal layer, one ends of the plurality of metalized through holes penetrate through the middle metal layer and the dielectric layer to be contacted with the upper metal layer, the other ends of the plurality of metalized through holes extend downwards from the dielectric layer to be contacted with the lower metal layer, the strip line is horizontally arranged in the middle layer of the dielectric layer, and the narrow edge of the strip line is flush with one edge of the dielectric layer; a circular gap is formed in the center of the upper metal layer, and two rectangular gaps symmetrically extend from the circular gap to two sides; the structure of the middle metal layer is the same as that of the upper metal layer; the plurality of metallized through holes form a circle, and the circle center is positioned at the center of the upper metal layer. The antenna of the method is miniaturized and easy to integrate.

Description

Broadband back cavity slot antenna based on dielectric integrated waveguide
Technical Field
The invention relates to the field of cavity-backed slot antennas.
Background
The metal back cavity slot antenna has a wider impedance bandwidth and a higher gain characteristic, but has several disadvantages: the section is too high, and the miniaturization problem is difficult to solve; difficult integration has increased the processing degree of difficulty.
Disclosure of Invention
The invention aims to solve the problems that the conventional metal back cavity slot antenna is too high in section, difficult to miniaturize and integrate and difficult to process, so that the broadband back cavity slot antenna based on the dielectric integrated waveguide is provided.
The invention relates to a broadband back cavity slot antenna based on a dielectric integrated waveguide, which comprises an upper metal layer 1, a dielectric layer 2, a middle metal layer 3, a strip line 4, a plurality of metalized through holes 5 and a lower metal layer 6;
the upper surface and the lower surface of the dielectric layer 2 are respectively tightly adhered to the upper metal layer 1 and the middle metal layer 3, one ends of the plurality of metalized through holes 5 penetrate through the middle metal layer 3 and are contacted with the dielectric layer 2, the other ends of the plurality of metalized through holes 5 extend downwards to be contacted with the lower metal layer 6, the strip line 4 is horizontally arranged in the middle layer of the dielectric layer 2, and the narrow edge of the strip line 4 is flush with one edge of the dielectric layer 2;
a circular gap is formed in the center of the upper metal layer 1, and two rectangular gaps symmetrically extend from the circular gap to two sides; the structure of the middle metal layer 3 is the same as that of the upper metal layer 1; the plurality of metallized through holes 5 form a circle, and the center of the circle is positioned at the center of the upper metal layer 1.
Preferably, the antenna is rectangular, the length l of the rectangle being 6mm and the width w being 5.5 mm.
Preferably, the radius R of the circular gap is 2.1, the length m of the rectangular gap is 1.9mm, the total length d of the 2 rectangular gaps and the circular gap is 4.8mm, the inner diameter R of the circle formed by the plurality of metalized through holes 5 is 2.75mm, the diameter of each metalized through hole 5 is 0.1mm, and the center-to-center distance between adjacent metalized through holes 5 is 0.48 mm.
Preferably, the length L of the strip line 41Is 2.1mm, and has a width W1Is 0.78 mm.
Preferably, the dielectric constant of the dielectric layer 2 is 2.2 and the thickness h is 1.016 mm.
Preferably, the distance Ch between the middle metal layer 3 and the lower metal layer 6 is 0.787 mm.
The whole antenna has good performance and can meet the design requirement of a broadband. After a dielectric Integrated Waveguide (SIW) structure is introduced, the profile height of the whole antenna is reduced, the performance of the antenna is not obviously changed, the size of the antenna is smaller, and the metal wall is replaced by the utilized via hole process band, so that the Integrated processing is easy. The design requirements of miniaturization and easy integration of the antenna are met.
Drawings
FIG. 1 is a top view of a dielectric integrated waveguide based broadband cavity backed slot antenna;
FIG. 2 is a structural schematic diagram of a broadband cavity-backed slot antenna based on a dielectric integrated waveguide, as viewed from the side;
FIG. 3 is a return loss plot;
FIG. 4 is a graph of gain variation;
figure 5 is a radiation pattern at 33GHz,
Figure GDA0002371388040000021
figure 6 is a radiation pattern at 35GHz,
Figure GDA0002371388040000022
figure 7 is a radiation pattern at 37GHz,
Figure GDA0002371388040000023
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The broadband cavity-backed slot antenna based on the dielectric integrated waveguide comprises an upper metal layer 1, a dielectric layer 2, a middle metal layer 3, a strip line 4, a plurality of metalized through holes 5 and a lower metal layer 6;
the upper surface and the lower surface of the dielectric layer 2 are respectively tightly adhered to the upper metal layer 1 and the middle metal layer 3, one ends of the plurality of metalized through holes 5 penetrate through the middle metal layer 3 and are contacted with the dielectric layer 2, the other ends of the plurality of metalized through holes 5 extend downwards to be contacted with the lower metal layer 6, the strip line 4 is horizontally arranged in the middle layer of the dielectric layer 2, and the narrow edge of the strip line 4 is flush with one edge of the dielectric layer 2;
a circular gap is formed in the center of the upper metal layer 1, and two rectangular gaps symmetrically extend from the circular gap to two sides; the structure of the middle metal layer 3 is the same as that of the upper metal layer 1; the plurality of metallized through holes 5 form a circle, and the center of the circle is positioned at the center of the upper metal layer 1.
The whole structure of the antenna is rectangular, the length l of the rectangle is 6mm, and the width w of the rectangle is 5.5 mm. The radius R of the circular gap is 2.1, the length m of the rectangular notch is 1.9mm, the total length d of the 2 rectangular notches and the circular gap is 4.8mm, the inner diameter R of the circle formed by the plurality of metalized through holes 5 is 2.75mm, the diameter of each metalized through hole 5 is 0.1mm, and the center distance between every two adjacent metalized through holes 5 is 0.48 mm. Length L of strip line 41Is 2.1mm, and has a width W1Is 0.78 mm. A dielectric material of Rogers5880 was used, dielectric layer 2 had a dielectric constant of 2.2, a loss tangent of 0.0009 and a thickness h of 1.016 mm. The distance Ch between the middle metal layer 3 and the lower metal layer 6 is 0.787 mm.
In order to solve the problem of phase difference between the edges of the front and rear slits, a notch is respectively added on the left and right sides of the circular slit to prolong the front and rear current paths. The antenna is laterally fed by a strip line 4 and is surrounded into a circle by a metalized through hole 5 to form a cylindrical metal back cavity.
The return loss and gain curves of the dielectric integrated waveguide based wideband cavity backed slot antenna of this embodiment are shown in fig. 3 and 4. The simulation result shows that the impedance bandwidth range below-10 dB is 30.9GHz-42GHz, the relative bandwidth is 30.5%, the standard of the broadband is achieved, and the resonance depth at the central frequency of 35GHz reaches nearly-45 dB, which shows that the matching effect of the antenna is very good; meanwhile, the average gain in the band reaches 5.72dB, the gain near 35GHz reaches the maximum value of 6.75dB, and the gain of the antenna at the moment is still slightly lower than that obtained by the air cavity. Radiation patterns for selecting three frequency points are shown in fig. 5 to 7 (
Figure GDA0002371388040000031
The included angle between the surface and the XOZ surface is the surface formed by the selected point and the Z axis), compared with a medium-loaded broadband Cavity-backed Slot Antenna (CBSA), the directional patterns of the two surfaces have no obvious difference and are basically consistent, the directional patterns still radiate towards the normal vector direction of the Antenna, and the directional pattern change difference of three frequency points is basically not large. Therefore, the whole antenna unit has good performance and can meet the design requirement of the broadband of the invention.
After the structure of the SIW is introduced, the profile height of the whole antenna is reduced from the height of the existing metal cavity of 2.3mm to the height of the metallized through hole of 1.8mm, the relative profile height is reduced by 21.7%, and the performance of the antenna is not obviously changed. The antenna has smaller size, and the metal wall is replaced by the simple via hole process band, so that the integrated processing is easy. The design requirements of miniaturization and easy integration of the antenna are met.

Claims (6)

1. The broadband cavity-backed slot antenna based on the dielectric integrated waveguide is characterized by comprising an upper metal layer (1), a dielectric layer (2), a middle metal layer (3), a strip line (4), a plurality of metalized through holes (5) and a lower metal layer (6);
the upper surface and the lower surface of the dielectric layer (2) are respectively tightly attached to the upper metal layer (1) and the middle metal layer (3), one ends of the plurality of metalized through holes (5) penetrate through the middle metal layer (3) to be contacted with the dielectric layer (2), the other ends of the plurality of metalized through holes (5) extend downwards to be contacted with the lower metal layer (6), the strip line (4) is horizontally arranged in the middle layer of the dielectric layer (2), and the narrow edge of the strip line (4) is flush with one edge of the dielectric layer (2);
a circular gap is formed in the center of the upper metal layer (1), and two rectangular gaps symmetrically extend from the circular gap to two sides; the structure of the middle metal layer (3) is the same as that of the upper metal layer (1); the plurality of metallized through holes (5) form a circle, and the circle center is positioned at the center of the upper metal layer (1).
2. The dielectric integrated waveguide based broadband cavity-backed slot antenna according to claim 1, wherein the antenna is rectangular, and the length l of the rectangle is 6mm, and the width w of the rectangle is 5.5 mm.
3. The dielectric integrated waveguide based broadband cavity-backed slot antenna according to claim 1 or 2, wherein the radius R of the circular slot is 2.1, the length m of the rectangular notch is 1.9mm, the total length d of the 2 rectangular notches and the circular slot is 4.8mm, the inner diameter R of the circle formed by the plurality of metalized through holes (5) is 2.75mm, the diameter of each metalized through hole (5) is 0.1mm, and the center-to-center distance between adjacent metalized through holes (5) is 0.48 mm.
4. The dielectric integrated waveguide based broadband cavity-backed slot antenna according to claim 3, characterized in that the length L of the strip line (4)1Is 2.1mm, and has a width W1Is 0.78 mm.
5. The dielectric integrated waveguide based broadband cavity-backed slot antenna according to claim 4, wherein the dielectric constant of the dielectric layer (2) is 2.2 and the thickness h is 1.016 mm.
6. The dielectric integrated waveguide based broadband cavity-backed slot antenna according to claim 5, characterized in that the distance Ch between the middle metal layer (3) and the lower metal layer (6) is 0.787 mm.
CN201811222673.6A 2018-10-19 2018-10-19 Broadband back cavity slot antenna based on dielectric integrated waveguide Expired - Fee Related CN109273858B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443802A (en) * 1981-04-22 1984-04-17 University Of Illinois Foundation Stripline fed hybrid slot antenna
CN104466417A (en) * 2014-11-12 2015-03-25 中国人民解放军国防科学技术大学 Back cavity gap antenna

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958197A (en) * 2016-06-16 2016-09-21 南京邮电大学 Triangle substrate-integrated waveguide resonator-based planar slot antenna
CN206907925U (en) * 2017-07-20 2018-01-19 南京邮电大学 Substrate integration wave-guide circular cavity knot groove slot antenna

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443802A (en) * 1981-04-22 1984-04-17 University Of Illinois Foundation Stripline fed hybrid slot antenna
CN104466417A (en) * 2014-11-12 2015-03-25 中国人民解放军国防科学技术大学 Back cavity gap antenna

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
A circular aperture antenna backed by a cavity;H. Nakano等;《IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)》;20020806;第586-589页 *
Dual-Band Wide-Angle Scanning Phased Array Composed of SIW-Cavity Backed Elements;You-Feng Cheng等;《IEEE Transactions on Antennas and Propagation》;20180227;第66卷(第5期);第2678-2683页 *
基于基片集成波导技术的背腔式缝辐射天线研究;唐小均;《中国优秀硕士学位论文全文数据库-信息科技辑》;20090415(第4期);第40-52页 *
新型宽带毫米波背腔缝隙天线研究;卢俊麒;《中国优秀硕士学位论文全文数据库-信息科技辑》;20120715(第7期);第35-47页 *

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