CN116995433A - Ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection - Google Patents
Ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection Download PDFInfo
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- CN116995433A CN116995433A CN202310971354.XA CN202310971354A CN116995433A CN 116995433 A CN116995433 A CN 116995433A CN 202310971354 A CN202310971354 A CN 202310971354A CN 116995433 A CN116995433 A CN 116995433A
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 208000006011 Stroke Diseases 0.000 title claims abstract description 49
- 206010008190 Cerebrovascular accident Diseases 0.000 title claims abstract description 36
- 230000002490 cerebral effect Effects 0.000 title claims abstract description 36
- 239000000758 substrate Substances 0.000 claims description 25
- 239000004593 Epoxy Substances 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 210000004556 brain Anatomy 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 206010008111 Cerebral haemorrhage Diseases 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000011094 fiberboard Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/0507—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves using microwaves or terahertz waves
-
- 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
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention discloses an ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection, and relates to the field of microwave antennas, wherein the type of the ultra-wideband planar spiral antenna is a planar Archimedes spiral antenna; the ultra-wideband planar spiral antenna comprises an antenna radiator, a feed balun and a feed port; the balance end of the feed balun is connected with the antenna radiator; the unbalanced end of the feed balun is connected with the feed port; the antenna radiator is a dodecagon fold line loaded Archimedes spiral radiator, and the radiator is a self-complementary antenna; the self-complementary antenna is an Archimedes spiral antenna with a self-complementary structure, wherein the width of the spiral arm is equal to the width of the air gap; the archimedes spiral radiator loaded by the dodecagon fold line is formed by designing each spiral arm of the archimedes spiral antenna into a dodecagon form as a radiator. The invention has relatively small volume, can meet the requirement of signal acquisition by attaching a plurality of patch antennas to the brain, and is more beneficial to microwave cerebral apoplexy detection.
Description
Technical Field
The invention relates to the technical field of microwave antennas, in particular to an ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection.
Background
When microwave imaging is performed on cerebral apoplexy, the characteristics of received electromagnetic waves can greatly influence the imaging effect. Because the human brain is a multi-layer compound tissue, when the human brain is close to the head, the head has a reflecting effect and an absorbing effect. Therefore, how to select the proper structure and working frequency will be directly related to the effect of cerebral stroke detection. In the existing research of microwave cerebral apoplexy detection (microwave cerebral apoplexy detection), the working frequency of a detection antenna is not clearly defined, and the detected electromagnetic waves have stronger penetrability and reach higher detection precision. If the device works in a lower working frequency band, the device has higher penetrability, but the spatial resolution is reduced; at high frequencies, although a high resolution can be obtained, it lacks sufficient penetration power. Currently existing research is focused mainly on the frequency range of 0.5-4 GHz. Particularly in the low frequency part, the antenna size is an important issue. Therefore, the ultra-wideband antenna with low frequency is more suitable for microwave detection. The ultra-wideband antenna has the characteristics of miniaturization, circular polarization, light weight, wide frequency band, easy conformal and the like. A planar helical antenna is a common ultra-wideband antenna with extremely high operating bandwidth. In the research of detecting cerebral hemorrhage by microwaves, the antenna performance directly influences the accuracy of a cerebral hemorrhage detection result. The ultra-wideband antenna is widely applied to communication systems and biomedical detection due to the advantages of strong interference resistance, high transmission rate, high precision positioning and the like.
At present, the volume of the existing ultra-wideband antenna applied to low frequency is relatively large, and the acquisition of signals by attaching a plurality of patch antennas to the brain is difficult to meet, so that the microwave cerebral apoplexy detection is not facilitated.
Disclosure of Invention
The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection is relatively small in size, can meet the requirement of signal acquisition by attaching a plurality of patch antennas to the brain, and is more beneficial to microwave cerebral apoplexy detection.
In order to achieve the above object, the present invention provides the following solutions:
an ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection, wherein the type of the ultra-wideband planar spiral antenna is a planar Archimedes spiral antenna; the ultra-wideband planar spiral antenna comprises an antenna radiator, a feed balun and a feed port;
the balance end of the feed balun is connected with the antenna radiator; the unbalanced end of the feed balun is connected with the feed port;
the antenna radiator is a dodecagon fold line loaded Archimedes spiral radiator; the archimedes spiral radiator loaded by the dodecagon fold line is a self-complementary antenna; the self-complementary antenna is an Archimedes spiral antenna with a self-complementary structure, wherein the width of the spiral arm is equal to the width of the air gap; the archimedes spiral radiator loaded by the dodecagon fold line is formed by designing each spiral arm of the archimedes spiral antenna into a dodecagon form to serve as a radiator.
Optionally, the ultra-wideband planar spiral antenna further comprises a dielectric substrate;
the archimedes spiral radiator loaded by the dodecagon fold line is supported by the medium substrate;
and the balance end of the feed balun penetrates through the dielectric substrate and is connected with the Archimedes spiral radiator loaded by the dodecagon fold line.
Optionally, the dielectric substrate is rectangular in shape.
Optionally, the thickness of the dielectric substrate is 0.5mm.
Optionally, the dielectric substrate is made of epoxy glass fiber board.
Optionally, the dielectric substrate has a dielectric constant of 4.4.
Optionally, the material of the dodecagonal fold line loaded archimedes spiral radiator is a perfect electrical conductor.
Optionally, the unbalanced end of the feed balun is provided with a waveguide port;
and the unbalanced end of the feed balun is connected with the feed port through the waveguide port.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection disclosed by the invention has the advantages that the antenna type is a planar Archimedes spiral antenna, an antenna radiator adopts an Archimedes spiral antenna with a self-compensating structure, the width of a spiral arm of which is equal to that of an air gap, and the Archimedes spiral antenna well compensates the defect that the existing ultra-wideband antenna applied to low frequency is relatively large in volume and difficult to collect signals on a plurality of patch antennas of a brain, and can meet the requirement of collecting signals on the plurality of patch antennas of the brain; meanwhile, each spiral arm of the Archimedes spiral antenna is designed into a dodecagon form to serve as a radiator, so that the dodecagon fold line loaded Archimedes spiral radiator is formed, the dodecagon fold line loaded Archimedes spiral radiator serves as an antenna radiator, the plane structure is further reduced, the size is relatively small, a current path is remarkably increased, the resonant frequency of the antenna is further reduced, and microwave cerebral apoplexy detection is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an embodiment of an ultra wideband planar spiral antenna based on microwave stroke detection in accordance with the present invention;
FIG. 2 is a detailed flow chart of the design steps of the ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection;
FIG. 3 is a schematic view of a dodecagonal polyline loaded Archimedes spiral of the present invention;
FIG. 4 is a schematic view of the initial radius of the ultra wideband planar spiral antenna based on microwave cerebral apoplexy detection;
FIG. 5 is a schematic view of the outer radius of the ultra wideband planar spiral antenna based on microwave cerebral apoplexy detection;
FIG. 6 is a schematic diagram of the balun structure modeling of the ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection;
FIG. 7 is a schematic diagram of the front structural dimensions of the balun structure of the present invention;
FIG. 8 is a schematic view of the back side structure dimensions of the balun structure of the present invention;
fig. 9 is a block diagram of the balun structure of the present invention after connection to an antenna radiator;
FIG. 10 is a graph of balun structure versus overall return loss of an antenna in accordance with the present invention;
FIG. 11 is a graph of balun structure vs. overall voltage standing wave ratio of an antenna in accordance with the present invention;
FIG. 12 is a graph of balun structure versus overall antenna gain for the present invention;
FIG. 13 is a graph of the present invention measured at 0.5GHz intervals for the frequency band 0.8 GHz-9.2 GHz;
FIG. 14 is a schematic diagram of the simulated cerebral stroke detection of a brain model with an antenna attached to the CST according to the present invention;
fig. 15 is a diagram of an antenna structure model built in CST according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection is relatively small in size, can meet the requirement of signal acquisition by attaching a plurality of patch antennas to the brain, and is more beneficial to microwave cerebral apoplexy detection.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
FIG. 1 is a block diagram of an embodiment of an ultra wideband planar spiral antenna based on microwave stroke detection in accordance with the present invention. As shown in fig. 1, the present embodiment provides an ultra-wideband planar spiral antenna based on microwave cerebral stroke detection, and the type of the ultra-wideband planar spiral antenna (ultra-wideband planar spiral antenna based on microwave cerebral stroke detection) is a planar archimedes spiral antenna; the ultra wideband planar helical antenna comprises an antenna radiator 101, a feed balun 102 and a feed port (not shown in the figures).
The balance end of the feed balun 102 is connected with the antenna radiator 101; the unbalanced end of the feed balun 102 is connected to a feed port. The unbalanced end of the feed balun 102 is provided with a waveguide port; the unbalanced end of the feed balun 102 is connected to the feed port through a waveguide port.
The antenna radiator 101 is a dodecagonal fold line loaded archimedes spiral radiator; the archimedes spiral radiator loaded by the dodecagon fold line is a self-complementary antenna; the self-complementary antenna is an Archimedes spiral antenna with a self-complementary structure, wherein the width of the spiral arm is equal to the width of the air gap; the archimedes spiral radiator loaded by the dodecagon fold line is formed by designing each spiral arm of the archimedes spiral antenna into a dodecagon form as a radiator.
The ultra-wideband planar spiral antenna further comprises a dielectric substrate 103; the archimedes spiral radiator loaded by the dodecagon fold line is supported by the dielectric substrate 103; the balanced end of the feed balun 102 passes through the dielectric substrate 103 and is connected with an archimedes spiral radiator loaded by a dodecagon fold line.
In this embodiment, the archimedes spiral radiator loaded by the dodecagon folding line is made of an ideal electric conductor (Perfect Electric Conductor, PEC), the dielectric substrate 103 is made of epoxy glass fiber board, the dielectric substrate 103 is rectangular, the thickness of the dielectric substrate 103 is 0.5mm, and the dielectric constant of the dielectric substrate 103 is 4.4.
The following specifically describes an ultra wideband planar spiral antenna based on microwave cerebral apoplexy detection:
fig. 2 is a specific flow chart of steps of designing an ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection according to the present invention, and the specific flow chart of each step according to the antenna design method is shown in fig. 2. The ultra-wideband planar spiral antenna design flow based on microwave cerebral apoplexy detection provided by the embodiment is specifically as follows:
aiming at the research of microwave detection cerebral hemorrhage, according to the research result of the former, the specific technical index of the antenna is firstly determined, the proper antenna type is selected, the antenna structure is designed by using CST STUDIO SUITE (CST), the performance is optimized, and the structure shape and the size are finally determined.
Step 1: the specific technical indexes of the preset antenna are as follows:
(1) Working frequency range: 1-9 GHz;
(2) Full band in gain: 3-4 dBi;
(3) Standing wave ratio in full band: 2 or less;
(4) Antenna size: less than or equal to 7cm multiplied by 7cm;
step 2: the antenna type is determined to be a planar archimedes helical antenna. A complete planar archimedes spiral antenna body structure comprising: antenna radiator, feed balun and feed port.
(1) Determining radiator parameters
The working frequency of the antenna is 1-9 GHz, and the minimum wavelength is lambda min =33.33 mm, maximum wavelength λ max =300 mm. Minimum wavelength lambda between inner diameter and outer diameter of Archimedes spiral antenna and design frequency min And a maximum wavelength lambda max The relation of (1) and (2) shows that the initial radius is r 0 ≤λ min /8= 4.166mm. Wherein r is 0 And R is the starting radius and the outer radius of the antenna, respectively.
2r 0 ≤0.25λ min (1)
C＝2πR≥1.25λ max (2)
From the formula(2) It can be seen that R is not less than 1.25λ max /2pi=59.71 mm. However, in consideration of the convenience of the instrument in use for detecting the actual cerebral apoplexy, the size of the antenna should be smaller, and the influence of the welding points of the radiator (antenna radiator) and the balun (feed balun) on the radiation performance of the high frequency band is reduced to the greatest extent. The traditional archimedes spiral line is changed to be used as a radiator, and the archimedes spiral line loaded by the dodecagon folding line is changed, namely, each spiral arm of the archimedes spiral antenna is designed into a dodecagon form, as shown in fig. 3, which is a schematic diagram of the archimedes spiral line loaded by the dodecagon folding line, in fig. 3, the hollow spiral is the archimedes spiral line loaded by the left-hand dodecagon folding line, the solid spiral is the archimedes spiral line loaded by the right-hand dodecagon folding line, and the rotation number of each spiral arm is n=14. Its final selection r 0 =1 mm, r=29.5 mm, as shown in fig. 4 and 5. The archimedes spiral radiator loaded by the dodecagon fold line is a self-complementary antenna, the line width w=0.5 mm of the spiral arm, and the width of the spiral arm is equal to the width of the air gap.
(2) Feed balun structure
In order to achieve impedance matching of the coaxial line and the radiator and conversion of unbalanced signal to balanced signal, a feed balun is introduced between the radiator and the feed line. The microstrip transmission line transitions in a gradual manner, i.e., an infinite number of stepped impedance transformers are added, each of which will also be infinitely small in length. Modeling of antenna balun structure was performed using CST software. As shown in fig. 6, the upper part is a balun front structure, and the lower part is a balun back structure. The specific dimensions are shown in figures 7 and 8. Wherein one end of the balun structure connected with the radiator is a balanced end, and one end connected with the feed port is an unbalanced end.
(3) Antenna complete machine simulation
The modeling of antenna balun structure and antenna radiator integration was performed using CST software. The dielectric substrate of the radiator is formed by a rectangle with the thickness of 65mm multiplied by 1mm, and is made of FR-4 (epoxy glass fiber board) material with the dielectric constant of 4.4 in consideration of the design cost and other problems; fig. 9 is a schematic diagram of the balun structure after being connected to an antenna radiator, where the balanced end of the balun is connected to two arms (spiral arms) of the radiator, and a waveguide port is provided at the unbalanced end. The balun structure and the whole antenna return loss curve chart, the voltage standing wave ratio curve chart and the gain curve chart are shown in fig. 10, 11 and 12.
Most of the return loss is lower than-10 dB under the condition of 0.8 GHz-9.2 GHz, and the standing wave ratio is lower than 2. The gains were greater than 2.5dBi after 1.5 GHz. The patterns measured at intervals of every 0.5GHz in the case of the frequency bands of 0.8GHz to 9.2GHz were also tested, as shown in FIG. 13.
(4) Attaching an antenna to a brain model in CST to simulate stroke detection
As shown in fig. 14, 5 planar spiral antennas designed according to the present invention were attached around the brain model.
Through the design flow of the ultra-wideband planar spiral antenna applied to the microwave cerebral apoplexy detection, the ultra-wideband planar spiral antenna complete structure based on the microwave cerebral apoplexy detection is obtained. The ultra-wideband planar spiral antenna based on cerebral apoplexy detection is characterized in that an Archimedes spiral line loaded by a dodecagon fold line is used as a radiator, the radiator is made of an ideal electric conductor, the radiator is supported by a rectangular dielectric substrate with the thickness of 65mm multiplied by 1mm, and the dielectric substrate is made of FR-4 material and has the dielectric constant of 4.4 in consideration of the design cost and the like. Both sides of the feed balun structure are attached to a dielectric substrate which is 0.5mm thick and made of epoxy glass fiber board (FR-4), and the dielectric constant of the feed balun structure is 4.4. The feed balun structure is connected with the balance end of the radiator, and the Archimedes spiral line loaded by the left-handed dodecagon fold line is connected with the Archimedes spiral line loaded by the right-handed dodecagon fold line. A model of the antenna structure in CST is shown in fig. 15.
Compared with the prior art, the invention has the advantages that:
the existing ultra-wideband antenna applied to low frequency has relatively large volume, and is difficult to meet the defect that a plurality of patch antennas are attached to the brain for signal acquisition, the ultra-wideband planar spiral antenna based on microwave cerebral stroke detection is of a planar Archimedes spiral antenna, an antenna radiator adopts an Archimedes spiral antenna of a self-compensating structure with the width of a spiral arm equal to that of an air gap, the Archimedes spiral antenna well compensates the defect that the existing ultra-wideband antenna applied to low frequency has relatively large volume, and the signal acquisition of a plurality of patch antennas attached to the brain is difficult to meet.
Meanwhile, most of return loss of the archimedes spiral antenna loaded by the dodecagon fold line under the condition of 0.8 GHz-9.2 GHz is lower than-10 dB, and the archimedes spiral antenna is better than the return loss performance of the antenna for detecting cerebral apoplexy.
The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection can achieve the purpose of antenna miniaturization, and at present, although other modeling methods for increasing current paths can be used for achieving the purpose of antenna miniaturization, such as slotting, folding, power dividers and the like, the cost is high, meanwhile, the thickness increase is unfavorable for cerebral apoplexy system detection and use, and the implementation is difficult and has little significance. The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection has low cost, is beneficial to cerebral apoplexy system detection and use, is simple to realize, and has important significance for microwave cerebral apoplexy detection.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. An ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection is characterized in that the ultra-wideband planar spiral antenna is of a planar Archimedes spiral antenna; the ultra-wideband planar spiral antenna comprises an antenna radiator, a feed balun and a feed port;
the balance end of the feed balun is connected with the antenna radiator; the unbalanced end of the feed balun is connected with the feed port;
the antenna radiator is a dodecagon fold line loaded Archimedes spiral radiator; the archimedes spiral radiator loaded by the dodecagon fold line is a self-complementary antenna; the self-complementary antenna is an Archimedes spiral antenna with a self-complementary structure, wherein the width of the spiral arm is equal to the width of the air gap; the archimedes spiral radiator loaded by the dodecagon fold line is formed by designing each spiral arm of the archimedes spiral antenna into a dodecagon form to serve as a radiator.
2. The ultra-wideband planar spiral antenna based on microwave cerebral stroke detection of claim 1, wherein the ultra-wideband planar spiral antenna further comprises a dielectric substrate;
the archimedes spiral radiator loaded by the dodecagon fold line is supported by the medium substrate;
and the balance end of the feed balun penetrates through the dielectric substrate and is connected with the Archimedes spiral radiator loaded by the dodecagon fold line.
3. The ultra-wideband planar spiral antenna based on microwave stroke detection of claim 2, wherein the dielectric substrate is rectangular in shape.
4. The ultra-wideband planar spiral antenna based on microwave cerebral stroke detection of claim 2, wherein the thickness of the dielectric substrate is 0.5mm.
5. The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection as claimed in claim 2, wherein the dielectric substrate is made of epoxy glass fiber board material.
6. The ultra-wideband planar spiral antenna based on microwave cerebral stroke detection of claim 2, wherein the dielectric substrate has a dielectric constant of 4.4.
7. The ultra-wideband planar spiral antenna based on microwave cerebral stroke detection of claim 1, wherein the material of the dodecagonal fold line loaded archimedes spiral radiator is a perfect electrical conductor.
8. The ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection as claimed in claim 1, wherein the unbalanced end of the feed balun is provided with a waveguide port;
and the unbalanced end of the feed balun is connected with the feed port through the waveguide port.
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| CN202310971354.XA CN116995433A (en) | 2023-08-03 | 2023-08-03 | Ultra-wideband planar spiral antenna based on microwave cerebral apoplexy detection |
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| CN113451785A (en) * | 2021-06-25 | 2021-09-28 | 南京软赫波誉电子科技有限公司 | Ultra-wideband planar spiral antenna loaded with dielectric lens |
| CN115296008A (en) * | 2022-02-15 | 2022-11-04 | 中国民航大学 | Multi-constellation satellite navigation antenna based on GNSS flexible composite material |
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2023
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|---|---|---|---|---|
| US20140300526A1 (en) * | 2011-12-23 | 2014-10-09 | Nahid Rahman | System, method and apparatus including hybrid spiral antenna |
| CN107611594A (en) * | 2017-07-14 | 2018-01-19 | 电子科技大学 | A kind of new Archimedian screw directional aerial |
| CN109244660A (en) * | 2018-11-07 | 2019-01-18 | 中国电子科技集团公司第五十四研究所 | A kind of ultra wide band Archimedian screw array antenna |
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| CN112701487A (en) * | 2020-12-14 | 2021-04-23 | 南京爱而赢科技有限公司 | Small ultra-wideband circularly polarized planar helical antenna |
| CN113451785A (en) * | 2021-06-25 | 2021-09-28 | 南京软赫波誉电子科技有限公司 | Ultra-wideband planar spiral antenna loaded with dielectric lens |
| CN115296008A (en) * | 2022-02-15 | 2022-11-04 | 中国民航大学 | Multi-constellation satellite navigation antenna based on GNSS flexible composite material |
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