CN113612028A - Back cavity drum-shaped gap broadband antenna based on substrate integrated waveguide - Google Patents
Back cavity drum-shaped gap broadband antenna based on substrate integrated waveguide Download PDFInfo
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- CN113612028A CN113612028A CN202110754626.1A CN202110754626A CN113612028A CN 113612028 A CN113612028 A CN 113612028A CN 202110754626 A CN202110754626 A CN 202110754626A CN 113612028 A CN113612028 A CN 113612028A
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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
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Abstract
The invention discloses a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide, and belongs to the technical field of wireless communication. The antenna comprises two main parts, namely a substrate integrated waveguide cavity and a feed structure, wherein a drum-shaped gap is etched on the metal surface of the cavity, and a group of circular metal through holes are embedded in the cavity. By adopting the drum-shaped special gap and the group of interference through holes, the antenna simultaneously excites three cavity resonance modes in the substrate integrated waveguide cavity to realize the expansion of the input impedance bandwidth of the antenna, the relative bandwidth reaches 22.9 percent, and the maximum gain in the working frequency band (8.9GHz-11.19GHz) is 6.48 dBi. To enable application in planar circuit configurations, the antenna employs a single layer Rogers RT/Duroid 5880 substrate structure. The antenna has the characteristics of wide band, low manufacturing cost, easy integration with a planar circuit and the like, and is suitable for the wide band wireless communication environment.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a back cavity drum-shaped slot broadband antenna based on substrate integrated waveguide.
Background
In the development of communication systems, the characteristics of size, loss, bandwidth, cost, etc. of components are of great significance to the design of communication systems. Antennas play a crucial role in the conversion of electromagnetic waves from circuitry to space or vice versa. Cavity backed slot antennas and microstrip antennas are widely used in many fields due to their respective advantages. However, the conventional cavity-backed slot antenna has the defects of large volume, high cost, low power capacity, large loss and the like, so that the further application of the conventional cavity-backed slot antenna is limited.
Cavity backed slot antennas based on Substrate Integrated Waveguides (SIW) are favored for their small size, high power capability, and ability to integrate with planar circuits. The cavity backed slot antenna is provided, which has good radiation performance and gain, but has relatively low bandwidth due to the thin substrate which is far smaller than the quarter space wavelength of the traditional cavity backed slot antenna. To achieve bandwidth expansion, researchers have proposed and demonstrated some structures and methods. The antenna is a key component of a wireless communication system, and the broadband characteristic of the antenna is required in many communication systems such as satellite communication, indoor communication and the like. The method has important practical value for the research of the broadband back cavity slot antenna based on the substrate integrated waveguide.
Disclosure of Invention
The invention mainly solves the technical problem of designing a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide, which can realize high bandwidth and stable radiation direction, thereby providing higher and more effective signal transmission for a wireless communication system.
In order to achieve the above purpose, the invention adopts a technical scheme that: a cavity backed drum slot broadband antenna based on substrate integrated waveguide is provided. It is characterized by comprising:
a substrate integrated waveguide cavity for storing and radiating electromagnetic energy.
An antenna feed structure formed by combining a microstrip line and a common ground coplanar waveguide.
The back cavity drum-shaped gap broadband antenna based on the substrate integrated waveguide is characterized in that a drum-shaped gap is etched on the metal surface of a cavity, and a group of circular metal through holes are embedded in the cavity.
The invention has the beneficial effects that: firstly, compared with a common rectangular radiation gap structure, the invention adopts a drum-shaped gap structure, and the special structure of the drum-shaped gap structure enables electromagnetic waves with wider frequency range in a cavity to be radiated into a free space, thereby realizing the extension of the impedance bandwidth of the antenna. Then, since the drum gap has a length greater than one-half wavelength, it can excite two mixed resonance modes, further extending the impedance bandwidth of the antenna. And finally, a group of interference through holes are introduced into the substrate integrated waveguide cavity, and can generate perturbation on a low-order resonance mode under the condition of not influencing a high-order mixed resonance mode, so that the frequency of the low-order resonance mode is increased, and the low-order resonance mode is combined with the current working frequency band, and the bandwidth expansion is realized.
Drawings
FIG. 1 is a schematic structural diagram of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide according to the present invention;
FIG. 2 is a schematic diagram of a resonant mode of a cavity of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide according to the present invention;
FIG. 3 is a schematic diagram of the input impedance of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide according to the present invention;
FIG. 4 is a gain diagram of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide according to the present invention;
FIG. 5 shows detailed structural parameter dimensions of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide according to the present invention;
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Fig. 1 shows a structure diagram of a back cavity drum-shaped slot broadband antenna based on a substrate integrated waveguide. The method comprises the following steps: the antenna comprises two main parts, namely a substrate integrated waveguide cavity and a feed structure, wherein a drum-shaped gap is etched on the metal surface of the cavity, and a group of circular metal through holes are embedded in the cavity. The feed structure adopts a common ground coplanar waveguide with 50 ohm impedance, and is externally connected with a part of microstrip line to facilitate antenna test.
The dimensional parameters of an antenna embodying the present invention are shown in fig. 5.
Fig. 2 shows a cavity resonance condition of a cavity-backed drum-shaped slot broadband antenna based on a substrate integrated waveguide, as shown in the figure, three different resonance modes are excited in a cavity in an operating frequency band, where fig. 2(a) shows that the cavity mode is a half TE110 mode at 8.9GHz, and fig. 2(b) and (c) show two TE120 hybrid modes when the cavity mode is 10.24GHz and 11.19GHz, respectively, which proves that the antenna excites the three resonance modes in the operating frequency band and expands the bandwidth.
Fig. 3 shows the input impedance of a cavity-backed drum slot broadband antenna based on a substrate integrated waveguide, and as shown, the S11 is below 10dB in the frequency band from 8.9GHz to 11.19GHz, and the relative bandwidth is 22.9%.
Fig. 4 shows the gain of a cavity-backed drum slot broadband antenna based on substrate integrated waveguide, and as shown, the gain peak of the antenna is 6.48dBi in the operating frequency band from 8.9GHz to 11.19 GHz.
Claims (2)
1. A cavity backed drum-shaped slot broadband antenna based on substrate integrated waveguide, which can be used in the field of wireless communication, is characterized by comprising:
the antenna comprises two main parts, namely a substrate integrated waveguide cavity and a feed structure, wherein a drum-shaped gap is etched on the metal surface of the cavity, and a group of circular metal through holes are embedded in the cavity. The feed structure adopts a common ground coplanar waveguide with 50 ohm impedance, and is externally connected with a part of microstrip line to facilitate antenna test.
2. The substrate integrated waveguide based cavity backed drum slot broadband antenna according to claim 1, wherein: the radiation gap of the substrate integrated waveguide is a drum-shaped structure, the length of the drum-shaped gap is 18.5mm, the width of two ends of the drum-shaped gap is 5.4mm, the drum-shaped gap structure is formed by filling two semi-elliptical structures with rectangular gaps, wherein the major radius of each ellipse is 9.25mm, and the minor radius of each ellipse is 2.7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754626.1A CN113612028A (en) | 2021-07-02 | 2021-07-02 | Back cavity drum-shaped gap broadband antenna based on substrate integrated waveguide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754626.1A CN113612028A (en) | 2021-07-02 | 2021-07-02 | Back cavity drum-shaped gap broadband antenna based on substrate integrated waveguide |
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| Publication Number | Publication Date |
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| CN113612028A true CN113612028A (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110754626.1A Pending CN113612028A (en) | 2021-07-02 | 2021-07-02 | Back cavity drum-shaped gap broadband antenna based on substrate integrated waveguide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991299A (en) * | 2021-11-30 | 2022-01-28 | 维沃移动通信有限公司 | Antenna assembly and electronic equipment |
| CN117559127A (en) * | 2024-01-12 | 2024-02-13 | 中国计量大学 | Single-double-frequency adjustable frequency reconfigurable vehicle-mounted antenna based on substrate integrated waveguide |
-
2021
- 2021-07-02 CN CN202110754626.1A patent/CN113612028A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991299A (en) * | 2021-11-30 | 2022-01-28 | 维沃移动通信有限公司 | Antenna assembly and electronic equipment |
| CN117559127A (en) * | 2024-01-12 | 2024-02-13 | 中国计量大学 | Single-double-frequency adjustable frequency reconfigurable vehicle-mounted antenna based on substrate integrated waveguide |
| CN117559127B (en) * | 2024-01-12 | 2024-03-29 | 中国计量大学 | Single-double-frequency adjustable frequency reconfigurable vehicle-mounted antenna based on substrate integrated waveguide |
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