CN210607616U - Large-frequency-ratio cavity-backed antenna based on SIW - Google Patents
Large-frequency-ratio cavity-backed antenna based on SIW Download PDFInfo
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Abstract
The utility model discloses a large frequency ratio cavity backed antenna based on SIW, which comprises a dielectric substrate, four radiation patches, two microstrip feeders and a plurality of metal cylinders; four radiation patches and two microstrip feeders are arranged on the upper surface of the dielectric substrate, wherein one radiation patch is provided with a vacancy, two ends of the vacancy are respectively connected with the two microstrip feeders, the other three radiation patches are arranged in the vacancy side by side, the middle radiation patch is provided with a plurality of strip-shaped gaps and a semicircular gap, and metal cylinders penetrate through the dielectric substrate and are distributed around the third radiation patch and the vacancy. The utility model has the characteristics of high gain, small, radiation efficiency is high, radiation characteristic is good, can with circuit integration, can work in microwave and millimeter wave frequency channel simultaneously, can satisfy the communication demand of present low frequency channel, can satisfy the demand of following millimeter wave communication again.
Description
Technical Field
The utility model belongs to the technical field of wireless mobile communication's technique and specifically relates to indicate a big frequency ratio back of body chamber antenna based on SIW.
Background
As is well known in the art, an antenna is an essential element constituting a wireless communication device, and plays a role in transmitting and receiving electromagnetic waves in the entire wireless communication system. The device converts high-frequency current and electromagnetic wave into each other, is a conversion device between guided wave and free space wave, is widely applied to various civil and military fields such as mobile communication, remote sensing, navigation, broadcasting, radar and the like, and is of great importance to the performance of the whole wireless system.
Under the premise of meeting the requirement of multiple working frequency bands, the dual-band or multi-band antenna can effectively save the space occupied by the antenna, reduce the size of the whole antenna system, and simultaneously is beneficial to the integration of the whole wireless system and the reduction of the cost, so that the dual-band or multi-band antenna is one of the hot spots in the antenna research field in recent years. The working frequency band of the existing dual-frequency antenna is mostly located in the microwave frequency band of lower frequency, however, with the rapid development of wireless communication technology and the present millimeter wave technology, the dual-frequency antenna which can only work in the low frequency band cannot meet the requirement of millimeter wave communication in the future. Therefore, much attention has been paid to the research of dual-band or multi-band antennas that can simultaneously operate in microwave and millimeter wave bands.
Substrate Integrated Waveguide (SIW) is a new microwave transmission line. The metal waveguide has the characteristics of low loss and high power capacity, and does not have the defects of heavy metal waveguide structure and difficulty in processing; the microstrip line has the advantage of easy planar integration, and does not have the defect of large high-frequency radiation of the microstrip line; the processing is convenient, the price is low, and therefore, the microwave and millimeter wave circuit is widely applied.
According to investigation and understanding, the prior art that has been disclosed is as follows:
in 2015, penbo published an article named "design and study of multiband antennas" on the internet, which designed a multi-section printed monopole antenna. Wherein the main branch mainly corresponds to the 2.5GHz frequency band, the left side resonance branch mainly corresponds to the 5.5GHz resonance branch, and the right side resonance branch mainly corresponds to the 3.5GHz frequency band.
In 2017, an article entitled "A Dual-Polarized Dual-band antenna With Omni-Directional Radiation Patterns" published by Yi Liu, Xi Li, Lin Yang, AND Ying Liu on IEEE TRANSACTION ONANTENNAS AND PROPAGATION "proposes a novel Dual-Polarized Dual-band omnidirectional antenna. The antenna consists of a circular patch with eight slots, eight short metal pins and a center feed coaxial probe. With the TM01 mode, eight empty metal pins and slots can radiate the theta and phi components, respectively. Omnidirectional circular polarization can be produced at low frequency bands. When the fundamental TM02 mode is excited, an omnidirectional linear polarization may be produced at the higher wavelength band. Both an omnidirectional circularly polarized field and an omnidirectional linearly polarized field can be achieved at both resonance frequencies.
The multi-frequency antenna can only be used in microwave bands, cannot work in microwave bands and millimeter wave bands simultaneously, and is difficult to meet the requirements of existing communication and future millimeter wave simultaneous communication.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming and not enough, provide a big frequency ratio back of body chamber antenna based on SIW, have frequency bandwidth, low section, high gain, the simple characteristics of feed structure, can be applied to millimeter wave and microwave communication system.
In order to achieve the above object, the present invention provides a technical solution: a large-frequency-ratio cavity-backed antenna based on SIW comprises a dielectric substrate, a first radiation patch, a second radiation patch, a third radiation patch, a fourth radiation patch, a first microstrip feeder, a second microstrip feeder, a coaxial feeder and a plurality of metal cylinders, wherein the dielectric substrate is provided with a first dielectric layer and a second dielectric layer; the first radiation patch, the second radiation patch, the third radiation patch, the fourth radiation patch, the first microstrip feeder line and the second microstrip feeder line are arranged on the upper surface of the dielectric substrate; the first microstrip feeder line and the second microstrip feeder line are respectively positioned at two ends of the first radiation patch and connected with the first radiation patch, and gaps are formed at two sides of the first microstrip feeder line and the second microstrip feeder line and used for improving impedance matching at a feed position; the first radiation patch is provided with a vacancy, and the second radiation patch, the third radiation patch and the fourth radiation patch are sequentially arranged in the vacancy from the first microstrip feeder line to the second microstrip feeder line; the third radiation patch is a slot radiation patch, a plurality of strip slots are formed in the third radiation patch and used for realizing patch radiation, a semicircular slot is formed in the middle of the third radiation patch, and the coaxial feeder is located in the semicircular slot, so that the coaxial feeder and the third radiation patch become coupling feed, and the impedance matching of the antenna is improved; the metal cylinders penetrate through the dielectric substrate and are distributed around the third radiation patch and the vacant positions.
Further, the first radiation patch, the second radiation patch and the fourth radiation patch are all rectangular patches, the third radiation patch is a square patch, the vacancy is a rectangular vacancy, the metal cylinders are arranged around the third radiation patch to form a square structure, the metal cylinders are arranged around the rectangular vacancy to form a rectangular structure, and the metal cylinders are arranged near the first microstrip feeder line and the second microstrip feeder line to form semicircular structures respectively.
Further, the area of the second radiating patch is larger than that of the third radiating patch but smaller than that of the fourth radiating patch, and the diameter of the semicircular structure formed by the metal cylinders arranged near the first microstrip feed line is smaller than that of the semicircular structure formed by the metal cylinders arranged near the second microstrip feed line.
Furthermore, the first microstrip feeder line and the second microstrip feeder line are respectively connected with the middle parts of two short sides of the first radiation patch, the second radiation patch, the third radiation patch and the fourth radiation patch have the same central line, and the central line passes through the short side of the first radiation patch and the long side of the second radiation patch and the fourth radiation patch.
Furthermore, 9 strip-shaped gaps are formed in the third radiation patch and are arranged according to 3 x 3.
Further, a metal floor is arranged on the lower surface of the dielectric substrate, a round hole is formed in the metal floor, and feeding of the coaxial feeder is achieved through the round hole.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
1. the utility model discloses in can satisfying 29.1GHz ~ 37GHz frequency bandwidth, | S11| is less than or equal to-10 dB, and-10 dB impedance bandwidth is 23.9% promptly, and maximum gain can reach 15.36dBi in 29.1Hz ~ 37GHz working frequency range, compares with solitary millimeter wave antenna, and the gain has improved 1.36 dBi.
2. The utility model discloses can freely switch the use in 3.3, 5.2 and 33GHz three frequency channel, can satisfy different electronic equipment's demand.
3. The utility model discloses in the middle of placing second radiation paster and fourth radiation paster in third radiation paster (can realize millimeter wave antenna function), this second radiation paster and fourth radiation paster can realize microwave band antenna function for microwave band antenna is as the back of the body chamber of millimeter wave antenna, and then has improved millimeter wave antenna's gain.
4. The utility model has the characteristics of high gain, low section structure, radiation efficiency are high, radiation characteristic is good, can with circuit integration, can work in microwave and millimeter wave frequency channel simultaneously, can satisfy the communication demand of present low frequency channel, can satisfy the demand of following millimeter wave communication again.
Drawings
Fig. 1 is a perspective view of a SIW-based cavity-backed antenna according to this embodiment.
Fig. 2 is a schematic bottom surface structure diagram of the SIW-based cavity-backed antenna with large frequency ratio according to this embodiment.
Fig. 3 is a schematic diagram of the upper surface structure of the SIW-based cavity-backed antenna of this embodiment with a large frequency ratio.
Fig. 4 is a graph of simulation results of | S11| of the millimeter wave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment.
Fig. 5 is a gain curve diagram of the millimeter wave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment.
Fig. 6 is an E-plane radiation pattern of the millimeter wave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment at 33 GHz.
FIG. 7 is the H-plane radiation pattern of the microwave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment at 33 GHz.
Fig. 8 is a graph of simulation results of | S11| of the microwave antenna of the large frequency ratio cavity-backed antenna based on SIW of the present embodiment.
FIG. 9 shows xoz plane radiation patterns at 3.3GHz for the microwave antenna based on the SIW cavity-backed antenna of the present embodiment.
FIG. 10 is the yoz plane radiation pattern of the microwave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment at 3.3 GHz.
FIG. 11 is xoz plane radiation patterns at 5.2GHz for a microwave antenna based on a SIW large frequency ratio cavity-backed antenna of the present embodiment.
FIG. 12 is the yoz plane radiation pattern at 5.2GHz for the microwave antenna based on the SIW large frequency ratio cavity-backed antenna of the present embodiment.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
As shown in fig. 1 to fig. 3, the SIW-based cavity-backed antenna with large frequency ratio provided in this embodiment includes a dielectric substrate 1, a first radiation patch 2, a second radiation patch 3, a third radiation patch 4, a fourth radiation patch 5, a first microstrip feed line 7, a second microstrip feed line 8, a coaxial feed line 14, and a plurality of metal cylinders 9; the cross section of the dielectric substrate 1 is rectangular, the thickness of the dielectric substrate is 1.575mm, the dielectric constant is 2.2, and the loss tangent is 0.0004; the first radiation patch 2, the second radiation patch 3, the third radiation patch 4, the fourth radiation patch 5, the first microstrip feeder 7 and the second microstrip feeder 8 are arranged on the upper surface of the dielectric substrate 1; the first microstrip feeder line 7 and the second microstrip feeder line 8 are respectively positioned at two ends of the first radiation patch 2 and connected with the first radiation patch 2, two sides of the first microstrip feeder line 7 are provided with gaps 10, and two sides of the second microstrip feeder line 8 are provided with gaps 11 for improving impedance matching at a feed position; the first radiation patch 2 is provided with a vacancy, and the second radiation patch 3, the third radiation patch 4 and the fourth radiation patch 5 are sequentially arranged in the vacancy from the first microstrip feeder line 7 to the second microstrip feeder line 8; the third radiation patch 4 is a slot radiation patch, 9 strip slots are arranged on the third radiation patch 4 according to 3 x 3 for realizing patch radiation, a semicircular slot is arranged in the middle of the third radiation patch, and the coaxial feeder 14 is positioned in the semicircular slot, so that the coaxial feeder 14 and the third radiation patch 4 become coupling feed, and the impedance matching of the antenna is improved; the metal cylinders 9 penetrate through the dielectric substrate and are distributed around the third radiation patch 4 and the vacant positions; the lower surface of the dielectric substrate 1 is provided with a metal floor 13, the metal floor 13 is provided with a round hole 12, and the coaxial feeder 14 is fed through the round hole 12.
The first radiation patch 2, the second radiation patch 3 and the fourth radiation patch 5 are all rectangular patches, the third radiation patch 4 is a square patch, the vacancy is a rectangular vacancy, the metal cylinders 9 are arranged around the third radiation patch 4 to form a square structure, the metal cylinders are arranged around the rectangular vacancy to form a rectangular structure, and the metal cylinders are arranged near the first microstrip feeder 7 and the second microstrip feeder 8 to form semicircular structures respectively.
The area of the second radiating patch 3 is larger than that of the third radiating patch 4 but smaller than that of the fourth radiating patch 5, and the diameter of the semicircular structure formed by arranging the metal cylinders 9 near the first microstrip feed line 7 is smaller than that of the semicircular structure formed by arranging the metal cylinders near the second microstrip feed line 8.
The first microstrip feeder line 7 and the second microstrip feeder line 8 are respectively connected with the middle parts of two short sides of the first radiation patch 2, the second radiation patch 3, the third radiation patch 4 and the fourth radiation patch 5 share the same central line, and the central line passes through the short side of the first radiation patch 2 and the long sides of the second radiation patch 3 and the fourth radiation patch 5.
In this embodiment, all the dimensional parameters of the cavity-backed antenna with large frequency ratio are optimized, and the reflection coefficient of the millimeter wave antenna is as shown in fig. 4, and it can be seen from the figure that, | S11| ≦ 10dB, i.e., -10dB impedance bandwidth is 23.9%, in the frequency bandwidth of 29.1GHz to 37 GHz; the gain of the antenna is shown in fig. 5, and the maximum gain can reach 15.36dBi in the working frequency band of 29.1 GHz-37 GHz.
In this embodiment, the reflection coefficient of the cavity-backed antenna with a large frequency ratio is shown in fig. 8, where the low-band impedance bandwidth is 230MHz (3.21 to 23.44GHz), and the high-band impedance bandwidth is 580MHz (5.03 to 5.61 GHz).
The SIW-based large frequency ratio cavity-backed antenna of the present embodiment can be freely switched and used in three frequency bands of 3.3, 5.2 and 33GHz, and the simulated HFSS model thereof has an E-plane radiation pattern at 33GHz as shown in fig. 6, an H-plane radiation pattern at 33GHz as shown in fig. 7, an xoz-plane radiation pattern at 3.3GHz as shown in fig. 9, a yoz-plane radiation pattern at 3.3GHz as shown in fig. 10, a xoz-plane radiation pattern at 5.2GHz as shown in fig. 11, and a yoz-plane radiation pattern at 5.2GHz as shown in fig. 12.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. A large frequency ratio cavity-backed antenna based on SIW is characterized in that: the antenna comprises a dielectric substrate, a first radiation patch, a second radiation patch, a third radiation patch, a fourth radiation patch, a first microstrip feeder line, a second microstrip feeder line, a coaxial feeder line and a plurality of metal cylinders; the first radiation patch, the second radiation patch, the third radiation patch, the fourth radiation patch, the first microstrip feeder line and the second microstrip feeder line are arranged on the upper surface of the dielectric substrate; the first microstrip feeder line and the second microstrip feeder line are respectively positioned at two ends of the first radiation patch and connected with the first radiation patch, and gaps are formed at two sides of the first microstrip feeder line and the second microstrip feeder line and used for improving impedance matching at a feed position; the first radiation patch is provided with a vacancy, and the second radiation patch, the third radiation patch and the fourth radiation patch are sequentially arranged in the vacancy from the first microstrip feeder line to the second microstrip feeder line; the third radiation patch is a slot radiation patch, a plurality of strip slots are formed in the third radiation patch and used for realizing patch radiation, a semicircular slot is formed in the middle of the third radiation patch, and the coaxial feeder is located in the semicircular slot, so that the coaxial feeder and the third radiation patch become coupling feed, and the impedance matching of the antenna is improved; the metal cylinders penetrate through the dielectric substrate and are distributed around the third radiation patch and the vacant positions.
2. A SIW-based high frequency ratio cavity-backed antenna according to claim 1, wherein: the first radiation patch, the second radiation patch and the fourth radiation patch are all rectangular patches, the third radiation patch is a square patch, the vacancy is a rectangular vacancy, the metal cylinders are arranged around the third radiation patch to form a square structure, the metal cylinders are arranged around the rectangular vacancy to form a rectangular structure, and the metal cylinders are arranged near the first microstrip feeder line and the second microstrip feeder line to form semicircular structures respectively.
3. A SIW-based large frequency ratio cavity-backed antenna according to claim 2, wherein: the area of the second radiating patch is larger than that of the third radiating patch but smaller than that of the fourth radiating patch, and the diameter of the semicircular structure formed by the metal cylinders arranged near the first microstrip feeder line is smaller than that of the semicircular structure formed by the metal cylinders arranged near the second microstrip feeder line.
4. A SIW-based large frequency ratio cavity-backed antenna according to claim 2, wherein: the first microstrip feeder line and the second microstrip feeder line are respectively connected with the middle parts of two short sides of the first radiation patch, the second radiation patch, the third radiation patch and the fourth radiation patch have the same central line, and the central line passes through the short side of the first radiation patch and the long side of the second radiation patch and the fourth radiation patch.
5. A SIW-based high frequency ratio cavity-backed antenna according to claim 1, wherein: the third radiation patch is provided with 9 strip-shaped gaps which are arranged according to 3 multiplied by 3.
6. A SIW-based high frequency ratio cavity-backed antenna according to claim 1, wherein: the lower surface of the dielectric substrate is provided with a metal floor, the metal floor is provided with a round hole, and the coaxial feeder is fed through the round hole.
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| CN201921820464.1U CN210607616U (en) | 2019-10-28 | 2019-10-28 | Large-frequency-ratio cavity-backed antenna based on SIW |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110707425A (en) * | 2019-10-28 | 2020-01-17 | 华南理工大学 | Large-frequency-ratio cavity-backed antenna based on SIW |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707425A (en) * | 2019-10-28 | 2020-01-17 | 华南理工大学 | Large-frequency-ratio cavity-backed antenna based on SIW |
| CN110707425B (en) * | 2019-10-28 | 2024-04-09 | 华南理工大学 | SIW-based large-frequency-ratio back cavity antenna |
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