CN112018512A - Small-size planar medical directional microwave resonance antenna - Google Patents
Small-size planar medical directional microwave resonance antenna Download PDFInfo
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- CN112018512A CN112018512A CN202010815688.4A CN202010815688A CN112018512A CN 112018512 A CN112018512 A CN 112018512A CN 202010815688 A CN202010815688 A CN 202010815688A CN 112018512 A CN112018512 A CN 112018512A
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- 239000000758 substrate Substances 0.000 claims abstract description 33
- 230000005855 radiation Effects 0.000 claims abstract description 30
- 239000011888 foil Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000004088 simulation Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention relates to the field of radio frequency microwaves, in particular to a small-sized planar medical directional microwave resonant antenna which comprises a dielectric substrate, a feeder made of metal foil, feed ports, a platform mounting hole, a grounding radiation patch, an SMA connector and a connector mounting hole, wherein the grounding radiation patch is arranged on the bottom surface of the dielectric substrate, the feeder made of metal foil and the feed ports are arranged on the upper surface of the dielectric substrate, and the two feed ports are positioned at two ends of the feeder made of metal foil; the invention carries out real-time simulation by changing the shape and the size of the feed antenna, optimizes the structure, the material and the process of the antenna, confirms the reliability of a simulation result, increases the effective radiation resistance of the antenna, improves the radiation efficiency of the antenna, achieves the integral effect of improving an antenna system and meets the performance requirement of directional application.
Description
Technical Field
The invention relates to the field of radio frequency microwaves, in particular to a small-sized planar medical directional microwave resonant antenna which is applied to the research in the field of microwave medicine.
Background
The basic properties of microwaves generally show three characteristics of penetration, reflection and absorption, and the microwaves have great application potential in the fields of aerospace, military, civil use, medical treatment and the like, are widely applied to basic experimental research and clinical verification nowadays, and along with the improvement of the technical level of the microwaves, more and more microwaves are applied to medical research and clinical application, and meanwhile, the microwaves show good use effects in treatment, and compared with the prior laser technology, the microwaves are more superior in treatment application.
The microwave radiation antenna in different forms guides microwave energy to a part to be treated, absorbs microwave energy through dielectric loss, realizes heating and temperature rise, anti-inflammation and sterilization, promotes blood circulation and metabolism, plays a role in treatment and health care, and has high radiation efficiency, small bandwidth and higher selectivity and precision of microwave treatment.
The design of medical microwave antenna of present, general structure is complicated, and mini design, multilayer stack design and three-dimensional complicated design make the degree of difficulty big, and receive application environment's restriction on shape and volume.
Disclosure of Invention
In order to solve the technical problems, the invention provides a small-sized planar medical directional microwave resonant antenna which has the advantages of high radiation efficiency and small bandwidth.
In order to achieve the purpose, the invention adopts the following technical scheme:
a small-sized planar medical directional microwave resonance antenna comprises a dielectric substrate, a feeder made of metal foil, feed ports, a platform mounting hole, a grounding radiation patch, an SMA connector and a connector mounting hole, wherein the grounding radiation patch is arranged on the bottom surface of the dielectric substrate, the feeder made of metal foil and the feed ports are arranged on the upper surface of the dielectric substrate, and the two feed ports are positioned at two ends of the feeder made of metal foil; the feed port is provided with a joint mounting hole, an SMA joint is arranged in the joint mounting hole, the SMA joint connects the feed port with the grounding radiation patch, and platform mounting holes are arranged at four corners of the dielectric substrate.
Further, the ground radiation patch 5 has the same size as the dielectric substrate 1.
Furthermore, the metal foil feeder adopts a right-angle multi-fold line symmetrical concave wiring mode.
Further, the right angles of the feeder line folding lines made of the metal foil all adopt 45-degree angles.
Further, the impedance of the feed point is adjusted by changing the length of each side of the metal foil feeder, so that the actual input impedance of the antenna is matched with 50 omega of the characteristic impedance.
Furthermore, six square through holes are arranged at one side port of the metal foil feeder line and are used as SMA connecting ports.
Further, the antenna is simulated and optimally designed through electromagnetic simulation software ANSYS HFSS, the size of the antenna meeting the requirements of experimental application is obtained, the size of the substrate is determined by using the dielectric substrate with low dielectric constant, and the size and the shape of the feeder line are determined.
The working principle is as follows: the adopted microwave antenna is formed by loading metal foil with any shape on the surface of a PCB, an antenna unit is etched on an insulated dielectric substrate, a continuous metal layer is adhered to the reverse side of the substrate to form a grounding plane, radio frequency current is input on a feed line made of the metal foil and the ground through an adapter, the high frequency current is converted into electromagnetic wave, and the shape is changeable on the design of a three-dimensional resonator; when the planar microwave resonant antenna exists, the planar microwave resonant antenna has the advantages of simple two-dimensional physical geometry structure, low loss and strong concentrated radiation capability; meanwhile, the dielectric constant of the dielectric substrate is selected in a wide range (generally within a range of 6-140), and the material of the dielectric substrate can be flexibly selected according to different application requirements to control the size.
Compared with the prior art, the invention has the following beneficial effects: the antenna system has the advantages that real-time simulation is carried out by changing the shape and the size of the feed antenna, the structure, the material and the process of the antenna are optimized, the reliability of a simulation result is confirmed, the effective radiation resistance of the antenna is increased, the generation of high-order modes is reduced, the radiation efficiency of the antenna is improved, the overall effect of the antenna system is improved, the requirements of high radiation efficiency and small bandwidth are met on the same substrate and the same plane, the selectivity and the precision are improved, and the application requirement of the directional function is met.
Drawings
FIG. 1 is an exploded view of a small planar medical directional microwave resonant antenna;
FIG. 2 is a three-dimensional overall schematic view of a small-sized planar medical directional microwave resonant antenna;
FIG. 3 is a simulation diagram of S11 parameters of the small-sized planar medical directional microwave resonant antenna;
FIG. 4 is a simulation diagram of standing-wave ratio parameters of the small-sized planar medical directional microwave resonant antenna;
FIG. 5 is a field profile of a small planar medical directional microwave resonant antenna;
FIG. 6 is a gain diagram of a small planar medical directional microwave resonant antenna;
1. a dielectric substrate; 2. a metal foil made feeder; 3. a feed port; 4. a platform mounting hole; 5. a ground radiation patch; 6. an SMA joint; 7. and a connector mounting hole.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Taking a microwave 2.87GHz control experiment as an example, the antenna with the working frequency band at 2.87GHz has a small heat penetration depth, and different application requirements can be met by increasing the microwave power or changing the feeder parameters of the antenna.
As shown in fig. 1, a small-sized planar medical directional microwave resonant antenna comprises a dielectric substrate 1, a grounding radiation patch 5, feed ports 3 and a metal foil feeder 2, wherein the grounding radiation patch 5 is arranged on the bottom surface of the dielectric substrate 1, the metal foil feeder 2 and the feed ports 3 are arranged on the upper surface of the dielectric substrate 1, and the two feed ports 3 are positioned at two ends of the metal foil feeder 2; a connector mounting hole 7 is formed in the feed port 3, an SMA connector 6 is mounted in the connector mounting hole 7, the feed port 3 is connected with the grounding radiation patch 5 through the SMA connector 6, an inner core is directly welded on the feed port 3 through the SMA connector, platform mounting holes 4 are formed in four corners of the dielectric substrate 1, and the platform mounting holes are connected with an experiment platform, so that the movement and the fixation are convenient; the six square through holes corresponding to the SMA joints are arranged at the two ends of the feeder line, so that the connection between the joints and the antenna is facilitated, errors generated by simulation in the process are reduced, and discontinuity generated when the SMA adapter is connected is reduced; the SMA connector is adopted, so that the volume is small, the frequency band is wide, and the mechanical property is good;
the ground radiating patch 5 is the same size as the dielectric substrate 1.
The feeder 2 is in a micro-strip feeder form with characteristic impedance of 50 omega, the antenna has a three-dimensional structure as shown in figure 2, the feeder is in a right-angle multi-fold line symmetrical concave wiring mode, the substrate size is not changed, meanwhile, the layout is reasonable, the length of the multi-frequency antenna is reduced on the whole, and the occupied space and the dielectric loss of the antenna are reduced.
The right angles of the feeder line fold lines are all 45 degrees, so that the radiation efficiency is improved, and the return loss is reduced.
The dielectric substrate made of the high-dielectric-constant material can limit most energy inside the feeder line, the Q value of the structure is increased, the efficiency of radiation to the periphery is reduced, on the premise that the radiation efficiency and the power capacity of the antenna are guaranteed, the dielectric substrate with the dielectric constant of 4.4 is adopted, and the plane area of the dielectric substrate is 30mm multiplied by 83 mm.
Adopt the medical directional microwave resonance antenna in small-size plane on the individual layer base plate structure, through the shape that changes the feeder, the design is right angle multifolding shape, and reasonable layout realizes high radiation efficiency on small-size medium base plate, satisfies the bandwidth in 100M, covers the frequency channel of 2.87GHz (about between 2.2GHz to 3.43 GHz), for adapting to different experiment platforms, in the design of antenna, with practicality, miniaturization do as the design basis, and the size is little, simple structure.
The antenna is simulated and optimally designed through electromagnetic simulation software ANSYS HFSS, the size of the antenna meeting the requirements of experimental application is obtained, the size of the substrate is determined by using a dielectric substrate with low dielectric constant, and the size and the shape of the feeder line are determined.
The microstrip antenna has the characteristic of high Q value, so that the bandwidth is large, the Q value is reduced, and the working effect of the antenna under the frequency point is sacrificed; the invention parameterizes the initial scale of the antenna at the beginning of establishing the model, and continuously changes the initial definition value according to the feedback result of the simulation software in the design process to realize the integral change of the feeder line and the tuning between the required S parameter and the impedance matching.
Radio frequency current is input to the microstrip feeder line through the SMA adapter connecting the microstrip feeder line with the grounding radiation patch, and then the high frequency current is converted into electromagnetic wave, so that the antenna can regulate and control the electromagnetic wave.
The value of the reflection coefficient S11 is calculated from the port definition angle, and is shown in fig. 3 in the frequency sweep range of 1GHz to 5GHz through ANSYS HFSS simulation, so that the related information of the antenna bandwidth, the operating frequency band and the like can be easily observed to know the frequency characteristics of the antenna.
Since the incident wave energy cannot be completely radiated in the use process of the antenna, the generated reflection wave superposition may cause the reduction of the radiation efficiency of the antenna, which is expressed as a standing wave ratio VSWR, and the simulation of the simulation software ANSYS HFSS shows that the standing wave ratio image in the frequency sweep range of 1GHz to 5GHz is shown in fig. 4.
The electromagnetic field calculation of the antenna is a huge project, and the simulation calculation is carried out on the electromagnetic field distribution, the magnetic flux and the magnetic field intensity of the antenna by means of finite element method-based simulation software ANYS HFSS, so that the space electromagnetic field distribution of the small-sized planar medical directional microwave resonant antenna is obtained and is shown in figure 5.
The input power concentrated radiation degree of the small-sized planar medical directional microwave resonant antenna is quantitatively described through simulation software ANSYS HFSS, an infinite ideal matching boundary is set, and on the premise that the port input power is equal, the power density ratio of signals generated by an actual antenna and an ideal radiation unit at one point in space is represented as a three-dimensional gain diagram in fig. 6.
The invention provides an innovative design idea about related antennas implemented in the microwave medical background, and the design and use of the small-sized planar medical directional microwave resonant antenna are described in detail above, but the antenna has wide manufacturing and use range about the radio frequency microwave field and is not limited to the scope of the invention; it is obvious that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments made by those skilled in the art based on the embodiments of the present invention should also fall within the scope of the present invention without any inventive work.
Claims (7)
1. A small-sized planar medical directional microwave resonant antenna is characterized by comprising a dielectric substrate (1), wherein a grounding radiation patch (5) is arranged on the bottom surface of the dielectric substrate (1), a metal foil feeder (2) and two feed ports (3) are arranged on the upper surface of the dielectric substrate (1), and the two feed ports (3) are positioned at two ends of the metal foil feeder (2); the antenna is characterized in that a joint mounting hole (7) is formed in the position, located at the feed port (3), of the dielectric substrate (1), an SMA joint (6) is mounted in the joint mounting hole (7), the feed port (3) is connected with the grounding radiation patch (5) through the SMA joint (6), and platform mounting holes (4) are formed in four corners of the dielectric substrate (1).
2. The small planar medical directional microwave resonance antenna as claimed in claim 1, wherein six square through holes are provided at one side port of the metal foil feeder (2).
3. The small planar medical directional microwave resonance antenna as claimed in claim 1, wherein said metal foil feeder (2) is in the shape of a right-angled polyline.
4. The small planar medical directional microwave resonance antenna as claimed in claim 1, wherein the right angles of the metal foil feeder fold lines are all 45 °.
5. A small planar medical directional microwave resonator antenna as claimed in claim 3, characterized in that said metallic foil feeder (2) is in the form of a microstrip feeder having a characteristic impedance of 50 Ω.
6. The small planar medical directional microwave resonance antenna as claimed in claim 1, wherein the grounding radiation patch (5) is the same size as the dielectric substrate (1).
7. The small-sized planar medical directional microwave resonance antenna as claimed in claim 1, wherein the antenna is simulated and optimally designed through electromagnetic simulation software ANSYS HFSS, so as to obtain the antenna size meeting the requirements of experimental application.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010815688.4A CN112018512A (en) | 2020-08-14 | 2020-08-14 | Small-size planar medical directional microwave resonance antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010815688.4A CN112018512A (en) | 2020-08-14 | 2020-08-14 | Small-size planar medical directional microwave resonance antenna |
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| CN112018512A true CN112018512A (en) | 2020-12-01 |
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| CN202010815688.4A Pending CN112018512A (en) | 2020-08-14 | 2020-08-14 | Small-size planar medical directional microwave resonance antenna |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223109A (en) * | 2001-01-25 | 2002-08-09 | Furukawa Electric Co Ltd:The | Chip antenna and its manufacturing method |
| US20020118142A1 (en) * | 2001-02-15 | 2002-08-29 | Chien-Jen Wang | Dual-band meandering-line antenna |
| US20040104852A1 (en) * | 2002-11-29 | 2004-06-03 | Choi Won Kyu | Microstrip patch antenna and array antenna using supertrate |
| WO2012109801A1 (en) * | 2011-02-18 | 2012-08-23 | Siemens Aktiengesellschaft | A meander line antenna |
| CN208028210U (en) * | 2018-04-02 | 2018-10-30 | 安徽大学 | Dual-frequency dual-polarization laminated patch antenna based on microstrip balun feed |
| CN109687131A (en) * | 2018-12-26 | 2019-04-26 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | A kind of stacked microstrip antenna of broadband dual-frequency |
| CN110797653A (en) * | 2019-11-25 | 2020-02-14 | 中北大学 | Double-frequency point/high-radiation-efficiency planar microwave resonant antenna |
| WO2020103335A1 (en) * | 2018-11-22 | 2020-05-28 | 南京思追特电子科技有限公司 | Ultra-high frequency radio frequency identification microstrip and ultra-high frequency radio frequency identification reader and writer |
| CN111463562A (en) * | 2020-03-03 | 2020-07-28 | 杭州电子科技大学 | Ultra-wideband differential feed PIFA antenna with filtering effect |
-
2020
- 2020-08-14 CN CN202010815688.4A patent/CN112018512A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223109A (en) * | 2001-01-25 | 2002-08-09 | Furukawa Electric Co Ltd:The | Chip antenna and its manufacturing method |
| US20020118142A1 (en) * | 2001-02-15 | 2002-08-29 | Chien-Jen Wang | Dual-band meandering-line antenna |
| US20040104852A1 (en) * | 2002-11-29 | 2004-06-03 | Choi Won Kyu | Microstrip patch antenna and array antenna using supertrate |
| WO2012109801A1 (en) * | 2011-02-18 | 2012-08-23 | Siemens Aktiengesellschaft | A meander line antenna |
| CN208028210U (en) * | 2018-04-02 | 2018-10-30 | 安徽大学 | Dual-frequency dual-polarization laminated patch antenna based on microstrip balun feed |
| WO2020103335A1 (en) * | 2018-11-22 | 2020-05-28 | 南京思追特电子科技有限公司 | Ultra-high frequency radio frequency identification microstrip and ultra-high frequency radio frequency identification reader and writer |
| CN109687131A (en) * | 2018-12-26 | 2019-04-26 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | A kind of stacked microstrip antenna of broadband dual-frequency |
| CN110797653A (en) * | 2019-11-25 | 2020-02-14 | 中北大学 | Double-frequency point/high-radiation-efficiency planar microwave resonant antenna |
| CN111463562A (en) * | 2020-03-03 | 2020-07-28 | 杭州电子科技大学 | Ultra-wideband differential feed PIFA antenna with filtering effect |
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