CN114583445A - Microstrip log periodic antenna applied to brain microwave detection imaging system - Google Patents
Microstrip log periodic antenna applied to brain microwave detection imaging system Download PDFInfo
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- CN114583445A CN114583445A CN202210313899.7A CN202210313899A CN114583445A CN 114583445 A CN114583445 A CN 114583445A CN 202210313899 A CN202210313899 A CN 202210313899A CN 114583445 A CN114583445 A CN 114583445A
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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Abstract
The invention discloses a microstrip log-periodic antenna applied to a brain microwave detection imaging system, which comprises a substrate front metal structure, a dielectric substrate and a substrate back metal structure, wherein the substrate front metal structure, the dielectric substrate and the substrate back metal structure are arranged from top to bottom; the substrate back metal structure comprises a plurality of folding parts and a feed microstrip line, the feed microstrip line is connected with the far-end of the first radiation part through a metalized through hole, and the antenna oscillators of the first radiation part and the second radiation part are connected with the folding parts which are arranged oppositely through the metalized through hole. The microstrip log-periodic antenna applied to the brain microwave detection imaging system is provided with the folding part, the transverse size of the antenna is effectively reduced, the miniaturization of the antenna is realized, and the microstrip log-periodic antenna has the characteristics of high gain, ultra-wide band, stable directional diagram, light weight, low section, miniaturization and easiness in array combination, and can be effectively applied to the brain microwave detection imaging system.
Description
Technical Field
The invention relates to the technical field of microwave detection, in particular to a microstrip log-periodic antenna applied to a brain microwave detection imaging system.
Background
Stroke is an acute cerebrovascular disease with high morbidity, high disability rate and high mortality, and timely and effective diagnosis is very important for treating stroke. At present, the modes of detecting the stroke mainly include electronic Computed Tomography (CT), X-ray photography technology, Magnetic Resonance Imaging (MRI) and the like, however, these detection means generally have the defects of huge and expensive detection equipment, long detection time, radiation hazard and the like, which not only brings huge economic burden to patients, but also may bring irreversible damage to patients because the 'golden three hours' for treatment is missed.
At present, the microwave detection imaging technology is developed rapidly and maturely, and has great advantages in the future medical field. The characteristics of high precision, low radiation, low price, small equipment and easy general investigation make the device gradually receive the attention of researchers and be applied to the field of brain detection. At present, the domestic research on the stroke microwave detection technology is in a starting and exploring stage, most of the research is stopped in a theoretical verification and simulation experiment stage, and the portable wearable stroke microwave detection equipment is vigorously researched and developed and has wide market prospect.
The stroke microwave detection equipment mainly comprises a microwave signal source, a transmitting-receiving antenna array, a switch matrix circuit for controlling the transmitting-receiving antenna, a data acquisition circuit and a microwave data processing and analyzing system. The receiving and transmitting antenna array is attached to wearable equipment, a microwave signal source generates a large number of frequency point sweep frequency signals through upper computer control and transmits the sweep frequency signals by using an antenna, the microwave signal acquisition module acquires and stores an electric field received by the antenna and guides the electric field into the microwave signal processing module, and therefore the purposes of stroke detection and blood clot positioning are achieved by carrying out inversion imaging on acquired data.
The common frequency band of the stroke microwave detection technology is 1-4GHz, and the more the number of the receiving and transmitting antennas is, the more accurate the detection imaging result is. Therefore, an ultra-wideband and miniaturized antenna structure is designed, and is very important for data receiving, transmitting and collecting of brain microwave detection.
Disclosure of Invention
The invention aims to provide a microstrip log-periodic antenna applied to a brain microwave detection imaging system, which is provided with a folding part, effectively reduces the transverse size of the antenna, realizes the miniaturization of the antenna, has the characteristics of high gain, ultra-bandwidth, stable directional diagram, light weight, low section, miniaturization and easy array formation, and can be effectively applied to the brain microwave detection imaging system.
In order to achieve the above object, the present invention provides a microstrip log periodic antenna applied to a brain microwave detection imaging system, which comprises a substrate front metal structure, a dielectric substrate and a substrate back metal structure arranged from top to bottom,
the metal structure on the front surface of the substrate comprises a first radiation part and a second radiation part which are symmetrically arranged;
the substrate back metal structure comprises a plurality of folding parts and a feed microstrip line, the feed microstrip line is connected with the far-end of the first radiation part through a metalized through hole, and the antenna oscillators of the first radiation part and the second radiation part are connected with the folding parts which are arranged oppositely through the metalized through hole.
Preferably, the first radiation part comprises a first center connection microstrip line and a plurality of first antenna oscillators, the first antenna oscillators are alternately arranged on two sides of the first center connection microstrip line from outside to inside, the sizes of the first center connection microstrip line are sequentially reduced, the ground-near end of the first radiation part is arranged on the outer side of the dielectric substrate, and the ground-far end of the first radiation part is arranged in the middle of the dielectric substrate.
Preferably, the second radiation portion includes that the second center connects microstrip line and a plurality of second antenna element, a plurality of second antenna element from outside to inside set up in turn in the both sides and the size that microstrip line was connected at the second center reduce in proper order, the near-ground end of second radiation portion set up in the outside of medium base plate, the far-ground end of first radiation portion set up in the middle part of medium base plate.
Preferably, the plurality of folding parts are arranged opposite to the first antenna element and the second antenna element and connected through metalized through holes, and the sizes of the plurality of folding parts are sequentially reduced from outside to inside.
Preferably, one end of the feed microstrip line adopts an edge coaxial cable as a feed point, and the other end of the feed microstrip line is arranged in the center of the dielectric substrate and connected with the far-end of the first radiation part through a metalized through hole.
Preferably, the medium substrate is made of FR4 material, and the substrate front metal structure and the substrate back metal structure are made of copper material.
Therefore, the microstrip log-periodic antenna applied to the brain microwave detection imaging system with the structure has the following beneficial effects:
(1) by adopting the folding part, the transverse size of the log periodic antenna is effectively reduced, the miniaturization of the antenna is realized, the array is easy to assemble, and the scale of the antenna array is increased.
(2) The balanced symmetrical structure and the symmetrical feed mode are adopted, the balun structure is adopted at the feed end, the bandwidth of the log periodic antenna is effectively improved, the working bandwidth of 0.5GHz-3GHz can be achieved, the direction diagram is stable in the passband, the working frequency band effectively conforms to the frequency band used by human brain microwave detection imaging, and the radiation of the antenna is more stable.
(3) The horizontal polarization of the vibration element radiation field can effectively reduce the mutual coupling between array elements when the array is distributed along the circumference, realize good matching and radiation performance, and is sensitive to the horizontal attitude abnormal target.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a microstrip log-periodic antenna applied to a brain microwave detection imaging system according to the present invention;
FIG. 2 is a schematic diagram of a front metal structure of a substrate according to the present invention;
FIG. 3 is a schematic view of a metal structure on the back side of a substrate according to the present invention;
FIG. 4 is a return loss diagram of the present embodiment;
fig. 5 is a radiation pattern of an embodiment.
Reference numerals
1. A metal structure on the front surface of the substrate; 11. a first radiation section; 111. a first antenna element; 112. the first center is connected with the microstrip line; 12. a second radiation section; 121. the first center is connected with the microstrip line; 122. a second antenna element; 2. a dielectric substrate; 3. a substrate back metal structure; 31. a feed microstrip line; 32. a folded portion; 4. metallizing the through-hole;
Detailed Description
Examples
Fig. 1 is a schematic structural diagram of a microstrip log-periodic antenna applied to a brain microwave detection imaging system of the present invention, fig. 2 is a schematic structural diagram of a front metal structure of a substrate of the present invention, and fig. 3 is a schematic structural diagram of a back metal structure of a substrate of the present invention. The dielectric substrate 2 is made of FR4 material and has a dielectric constant of 4.4. The metal structure 1 on the front surface of the substrate and the metal structure 2 on the back surface of the substrate are made of copper materials, and the dielectric substrate 2 is a rectangle with the length of 91mm and the width of 64mm and the thickness of 1 mm.
The substrate front metal structure 1 includes a first radiation portion 11 and a second radiation portion 12 which are symmetrically arranged, the first radiation portion 11 includes a first center connection microstrip line 112 and a plurality of first antenna oscillators 111, this embodiment is provided with ten first antenna oscillators, the ten first antenna oscillators 111 are alternately arranged on two sides of the first center connection microstrip line 112 from outside to inside and the size is reduced in sequence, the near-ground end of the first radiation portion 11 is arranged on the outer side of the dielectric substrate 2, and the far-ground end of the first radiation portion 11 is arranged in the middle of the dielectric substrate 2. The second radiation portion 12 includes a second center connection microstrip line 121 and a plurality of second antenna elements 122, the second antenna elements 122 of this embodiment are ten, the ten second antenna elements 122 are alternately disposed on two sides of the second center connection microstrip line 121 from outside to inside and are reduced in size in sequence, the near-ground end of the second radiation portion 12 is disposed on the outer side of the dielectric substrate 2, and the far-ground end of the first radiation portion 12 is disposed in the middle of the dielectric substrate 2. The first radiation part 11 and the second radiation part 12 are in a balanced symmetrical structure, the array element radiation field is horizontally polarized, mutual coupling between array elements can be effectively reduced when array is distributed along the circumference, good matching and radiation performance are achieved, and the horizontal attitude anomaly target response is sensitive. The existing human brain imaging antenna is generally vertically polarized due to space limitation, and can not realize horizontal polarization.
The substrate back metal structure 3 comprises a plurality of folding portions 32 and a feed microstrip line 31, the feed microstrip line 31 is connected with the far end of the first radiation part 11 through a metalized through hole 4, the folding portions 32 are matched with the first antenna oscillator 111 and the second antenna oscillator 122 in number and size, the folding portions 32 are arranged opposite to the first antenna oscillator 111 and the second antenna oscillator 122 and are connected through the metalized through hole 4, and the sizes of the folding portions 32 are reduced from outside to inside in sequence. The antenna elements of the first and second radiating parts 11, 12 are connected to oppositely arranged folded portions 32 via metallized through holes 4. By adopting the folding part, the transverse size of the log periodic antenna is effectively reduced, the miniaturization of the antenna is realized, the array is easy to assemble, and the scale of the antenna array is increased. One end of the feed microstrip line 31 adopts an edge coaxial cable as a feed point, and the other end of the feed microstrip line 31 is disposed in the center of the dielectric substrate 2 and connected to the far end of the first radiating portion 11 through the metalized through hole 4. The antenna adopts the active area radiation mechanism of the antenna, adopts the feed microstrip line 31 to feed from the tail end, realizes symmetrical feed by the metalized through hole 4 in the center, completes the conversion from unbalance to balance, adopts the balun structure, effectively prevents the leakage current on the coaxial line outer conductor, thereby improving the radiation stability and increasing the effective bandwidth of the antenna. The bandwidth of the log periodic antenna is effectively improved, the working bandwidth of 0.5GHz-3GHz can be achieved, the direction diagram is stable in a passband, the working frequency band effectively conforms to the frequency band used by human brain microwave detection imaging, and the radiation of the antenna is more stable.
Fig. 4 is a return loss diagram of the antenna of the present invention, and it can be seen from the diagram that the operating frequency band below-10 dB is 0.5GHz-3 GHz. Fig. 5 is a radiation pattern of the antenna of the present invention.
Therefore, the microstrip log-periodic antenna applied to the brain microwave detection imaging system with the structure is provided with the folding part, so that the transverse size of the antenna is effectively reduced, the miniaturization of the antenna is realized, and the microstrip log-periodic antenna has the characteristics of high gain, ultra-wide band, stable directional diagram, light weight, low section, miniaturization and easiness in array formation, and can be effectively applied to the brain microwave detection imaging system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a be applied to microstrip log periodic antenna of brain microwave detection imaging system which characterized in that: comprises a substrate front metal structure, a dielectric substrate and a substrate back metal structure which are arranged from top to bottom,
the metal structure on the front surface of the substrate comprises a first radiation part and a second radiation part which are symmetrically arranged;
the substrate back metal structure comprises a plurality of folding parts and a feed microstrip line, the feed microstrip line is connected with the far-end of the first radiation part through a metalized through hole, and the antenna oscillators of the first radiation part and the second radiation part are connected with the folding parts which are arranged oppositely through the metalized through hole.
2. The microstrip log-periodic antenna applied to the brain microwave detection imaging system according to claim 1, wherein: the first radiation part comprises a first center connection microstrip line and a plurality of first antenna oscillators, the first antenna oscillators are alternately arranged on two sides of the first center connection microstrip line from outside to inside, the sizes of the first center connection microstrip line are sequentially reduced, the ground-near end of the first radiation part is arranged on the outer side of the medium substrate, and the ground-far end of the first radiation part is arranged in the middle of the medium substrate.
3. The microstrip log-periodic antenna applied to the brain microwave detection imaging system according to claim 2, wherein: the second radiation portion includes that the second center connects microstrip line and a plurality of second antenna element, a plurality of second antenna element from outer to interior alternative set up in the microstrip line is connected at the second center both sides and size reduce in proper order, the near-to-ground end of second radiation portion set up in the outside of medium base plate, the far-from-ground end of first radiation portion set up in the middle part of medium base plate.
4. The microstrip log-periodic antenna applied to the brain microwave detection imaging system according to claim 3, wherein: the folded parts are oppositely arranged with the positions of the first antenna oscillator and the second antenna oscillator and are connected through the metallized through holes, and the sizes of the folded parts are reduced from outside to inside in sequence.
5. The microstrip log-periodic antenna applied to the brain microwave detection imaging system according to claim 4, wherein: one end of the feed microstrip line adopts an edge coaxial cable as a feed point, and the other end of the feed microstrip line is arranged in the center of the dielectric substrate and is connected with the far-ground end of the first radiation part through a metalized through hole.
6. The microstrip log-periodic antenna applied to the brain microwave detection imaging system according to claim 1, characterized in that: the medium substrate is made of FR4 material, and the metal structure on the front side of the substrate and the metal structure on the back side of the substrate are made of copper materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313899.7A CN114583445B (en) | 2022-03-28 | 2022-03-28 | Microstrip log periodic antenna applied to brain microwave detection imaging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210313899.7A CN114583445B (en) | 2022-03-28 | 2022-03-28 | Microstrip log periodic antenna applied to brain microwave detection imaging system |
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| CN114583445A true CN114583445A (en) | 2022-06-03 |
| CN114583445B CN114583445B (en) | 2022-12-16 |
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Citations (7)
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| JPH11168323A (en) * | 1997-12-04 | 1999-06-22 | Mitsubishi Electric Corp | Multi-frequency antenna device and multi-frequency array antenna device using multi-frequency sharing antenna |
| JPH11234031A (en) * | 1998-02-10 | 1999-08-27 | Mitsubishi Electric Corp | Log periodic antenna |
| US20070018901A1 (en) * | 2005-07-19 | 2007-01-25 | Wei-Jen Wang | Log-periodic dipole array antenna |
| US20100182212A1 (en) * | 2009-01-17 | 2010-07-22 | National Taiwan University | Coplanar waveguide fed planar log-periodic antenna |
| CN104505591A (en) * | 2014-12-25 | 2015-04-08 | 中国电子科技集团公司第五十四研究所 | Broadband dual-linearly-polarized or dual-circularly-polarized feed source |
| CN205122763U (en) * | 2015-10-16 | 2016-03-30 | 天津七六四通信导航技术有限公司 | Be applied to two waveband dual -frenquency microstrip paster antenna of L wave band and C wave band |
| CN105576362A (en) * | 2015-12-25 | 2016-05-11 | 哈尔滨工业大学（威海） | Miniature broadband antenna device |
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2022
- 2022-03-28 CN CN202210313899.7A patent/CN114583445B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11168323A (en) * | 1997-12-04 | 1999-06-22 | Mitsubishi Electric Corp | Multi-frequency antenna device and multi-frequency array antenna device using multi-frequency sharing antenna |
| JPH11234031A (en) * | 1998-02-10 | 1999-08-27 | Mitsubishi Electric Corp | Log periodic antenna |
| US20070018901A1 (en) * | 2005-07-19 | 2007-01-25 | Wei-Jen Wang | Log-periodic dipole array antenna |
| US20100182212A1 (en) * | 2009-01-17 | 2010-07-22 | National Taiwan University | Coplanar waveguide fed planar log-periodic antenna |
| CN104505591A (en) * | 2014-12-25 | 2015-04-08 | 中国电子科技集团公司第五十四研究所 | Broadband dual-linearly-polarized or dual-circularly-polarized feed source |
| CN205122763U (en) * | 2015-10-16 | 2016-03-30 | 天津七六四通信导航技术有限公司 | Be applied to two waveband dual -frenquency microstrip paster antenna of L wave band and C wave band |
| CN105576362A (en) * | 2015-12-25 | 2016-05-11 | 哈尔滨工业大学（威海） | Miniature broadband antenna device |
Non-Patent Citations (1)
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| TAO JIANG 等: "Compact ultra-wideband directional printed antenna with notched band", 《2011 CHINA-JAPAN JOINT MICROWAVE CONFERENCE》 * |
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| CN114583445B (en) | 2022-12-16 |
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