CN105846074B - A kind of low section differential feed circular polarized antenna for capsule endoscope system - Google Patents
A kind of low section differential feed circular polarized antenna for capsule endoscope system Download PDFInfo
- Publication number
- CN105846074B CN105846074B CN201610323162.8A CN201610323162A CN105846074B CN 105846074 B CN105846074 B CN 105846074B CN 201610323162 A CN201610323162 A CN 201610323162A CN 105846074 B CN105846074 B CN 105846074B
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- low section
- differential feed
- seam
- polarized antenna
- circular polarized
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- 239000002775 capsule Substances 0.000 title claims abstract description 25
- 230000005855 radiation Effects 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000010410 layer Substances 0.000 description 14
- 210000003205 muscle Anatomy 0.000 description 6
- 239000002356 single layer Substances 0.000 description 6
- 210000001519 tissue Anatomy 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 210000002784 stomach Anatomy 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005388 cross polarization Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000000936 intestine Anatomy 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 210000004051 gastric juice Anatomy 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 208000008918 voyeurism Diseases 0.000 description 1
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Biophysics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Endoscopes (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of low section differential feed circular polarized antennas for capsule endoscope system, including metal radiation unit, upper and lower layer medium substrate and floor, the metal radiation unit is between upper and lower layer medium substrate, the floor is located at the lower surface of layer dielectric substrate, and the metal radiation unit is made of the square patch that quadrangle is circular arc.The advantages that present invention has size small, low section, bandwidth of operation and wider axial ratio bandwidth, is suitble to apply to capsule endoscope system field.
Description
Technical field
The present invention relates to biomedical telemetry fields, and in particular to a kind of low section difference for capsule endoscope system
Feed circular polarized antenna.
Background technique
Wireless implanted equipment is widely used to be set in medical diagnosis or sufferer treatment, the implanteds such as Wireless capsule endoscope
Standby and other medical technology, which can feed back intracorporal physiological data, is sent to external antenna for base station, and then according to the data of transmission
Made a definite diagnosis conditions of patients and formulated therapeutic scheme.Compared to conventional endoscope inspection, more shape can be presented in Wireless capsule endoscope
As the intestines and stomach of change.However, can be by multi-path jamming effects when being carried out data transmission using far field radio link telemetering；Together
When, using linear polarization as dual-mode antenna is connect, the movement of patient brings polarization mismatch in the detection process.Compared to linear polarization, circle
Polarization can not only reduce Path Loss, while can improve bit error rate, thus be more suitable for wireless telemetering application.According to connection
Nation's Federal Communications Commission (Federal Communications Commission, FCC) relevant regulations, the industry of 2.4-2.5GHz,
Scientific research, medical treatment (Industrial Scientific Medical, ISM) frequency range can be used for implantable medical device communication.
Since it is considered that alimentary canal tissue that will be different by electrical parameters when passing through intestines and stomach, is designed in wireless capsule
It is relatively difficult when sight glass antenna.The volume of medical capsule is π × (5.5)2×11mm2, in terms of pervious work, capsule antenna master
Will there are two types of, one is general character in capsule surface, but the corrosion of the acidic liquids such as gastric juice is easily received by stomach；Another kind is day
Line is placed in capsule, is avoided that the corrosion of outside organization's liquid, but occupy the confined space in capsule, is generally required the body of Antenna Design
Product is as small as possible.To avoid antenna from directly contacting with tissue, generally one layer of biocompatible membrane need to be plated in antenna surface.Radio frequency electrical
Road mostly uses difference channel, and antenna can be directly connected to the input/output end port of radio circuit using differential feed.
Summary of the invention
In order to overcome deficiency existing for existing biomedical telemetry antenna technology, the present invention provides a kind of for peeping in capsule
The low section differential feed circular polarized antenna of mirror system.
The present invention adopts the following technical scheme:
A kind of low section differential feed circular polarized antenna for capsule endoscope system, including metal radiation unit, it is upper,
Layer dielectric substrate and floor, for the metal radiation unit between upper and lower layer medium substrate, the floor is located at lower layer Jie
The lower surface of matter substrate, the metal radiation unit are made of the square patch that quadrangle is circular arc.
The center of the square patch is provided with the square groove with a pair of of corner cut, and the pair of corner cut is located at square patch
Piece it is diagonal on, the corner cut is equilateral triangle；
The surrounding of the square patch is provided with two L-types seam and two short rectangular seam, two L-types seam and two short
Rectangular seam is symmetrical about metal radiation unit center, and the inflection point of two L-types seam is located at the diagonal line of square patch
On, the starting point of the two short rectangular seam is located on the horizontal joint of two L-types seam, and terminal is at square patch edge.
It further include symmetric coaxial, the symmetric coaxial includes that upper right is coaxial and lower-left is coaxial, about in metal radiation unit
The heart is symmetrical.
The arc radius is 0.5mm, and central angle is 90 degree.
The floor is the square that quadrangle is circular arc.
Further include biological insulating layer film, is wrapped in the outer surface of entire antenna.
The square groove with a pair of of corner cut is located at the inside of two L-type seam institute's enclosing regions.
Beneficial effects of the present invention:
The application that L-type of the present invention is cracked can effectively extend current path, realize antenna miniaturization；Adjust short rectangular position of cracking
Adjusting phase is set, realizes circular polarisation performance, and then inhibit Path Loss；It can make antenna directly and radio frequency electrical using differential feed
Road is connected directly, and avoids bringing energy loss using balun.
Detailed description of the invention
Fig. 1 (a)~Fig. 1 (c) is respectively used to the vertical view of the low section differential feed circular polarized antenna of capsule endoscope system
Figure, floor panel structure schematic diagram and side view.
Fig. 2 is a kind of low section differential feed circular polarized antenna implantation single layer that can be used for capsule endoscope system of the present invention
The simulated environment figure of muscle model.
Fig. 3 is to invent a kind of low section differential feed circular polarized antenna implantation single layer flesh that can be used for capsule endoscope system
The reflectance difference coefficient bandwidth and axial ratio bandwidth figure of meat model.
Fig. 4 (a)~Fig. 4 (b) is when a kind of low section differential feed entelechy that can be used for capsule endoscope system of the present invention
Change antenna implantation single layer musculature model when in XOZ and YOZ plane actual gain analogous diagram.
Fig. 5 is the low section differential feed circular polarized antenna implantation people that can be used for capsule endoscope system when the present invention is a kind of
Radiation gain directional diagram when body stomach.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
Shown in Fig. 1 (a)~Fig. 1 (c), a kind of low section differential feed circular polarized antenna for capsule endoscope system,
Including metal radiation unit 1, upper and lower layer medium substrate 2A, 2B, symmetric coaxial, the symmetric coaxial include the coaxial 3A in lower-left and
The coaxial 3B of upper right, floor 4, the metal radiation unit are located among two layers of medium substrate, and the floor is located at layer dielectric base
The lower surface of plate 2B, the metal radiation unit 1 are made of the square patch that quadrangle is circular arc, the square patch center
Fluting and surrounding are provided with a plurality of seam, and the antenna is emulated in single layer muscle model and manikin respectively.
The metal radiation unit 1 is the square patch that quadrangle is circular arc, and the arc radius is 0.5mm, central angle
It is 90 °, the square patch side length La=7.2mm, 1 center of metal radiation unit is provided with the square with a pair of of corner cut
Slot, the pair of corner cut be located at square patch it is diagonal on, the corner cut is equilateral triangle, side length p=1mm, it is described just
Square groove side length Lb=3mm.Two L-type seam 6A, 6B and rectangular seam 7A, 7B two short, institute are also provided on the square patch
It states two L-type seams and two short rectangular seam is symmetrical about metal radiation unit center, the inflection point of two L-types seam is located at pros
On the diagonal line of shape patch, the square groove is located at the inside of two L-type seam enclosing regions, and the L-type seam includes horizontal joint
And vertical lap seam, the starting point of the two short rectangular seam is respectively on the horizontal joint of two L-types seam, and terminal is in corresponding pros
On the edge of shape patch.In the present embodiment, the inflection point in L-type gap and the corner cut of square patch are respectively positioned on square patch
On same diagonal line, symmetric coaxial is on another diagonal line of square patch, the vertical lap seam and horizontal joint of the L-type seam
Length be L1=4.9mm and L2=4.6mm respectively, width is all w=0.35mm, apart from center of antenna d1=2.55mm, institute
Short rectangular seam long k=0.7mm, w1=0.25mm are stated, stitches inflection point d4=0.8mm apart from the L-type.
The present invention can effectively extend current path using having the center grooved of corner cut and surrounding to crack, and realize miniaturization, together
When change length of corner cut and the short rectangular position cracked, adjust phase, improve circular polarisation purity.
The upper layer medium substrate 2A is located at 1 upper surface of metal radiation unit, and the material of selection is Rogers Ro3010,
Size is identical with floor, and thickness is 0.635mm, and relative dielectric constant is 10.2, and loss angle is 0.0035.
Radiating element upper surface of the present invention covers one layer of biological insulating layer film, the better isolated antennas of energy and tissue,
In order to avoid the corrosion by acid tissue fluid, while as similar balun is played between, avoid metallic conductor with
The tissue of high dielectric constant directly contacts, and reduces the loss of RF energy, extends the duty cycle of entire radio frequency system.
The layer dielectric substrate 2B is between metal radiation unit 1 and floor 4, size and material and top dielectric base
Plate 2A is identical.
The present invention uses high dielectric constant substrate, can antenna resonant frequency be reduced, realize the miniaturization of antenna.
Dielectric substrate thickness is much smaller than a quarter of the wavelength of working band, and section is lower.
The present invention two is coaxially located on square antenna diagonal line, can evoke TM10 and two kinds of oscillation modes of TM01.D2 is same
For axis to center of antenna distance, d3 is distance of the short rectangular seam apart from center of antenna.
The floor 4 is located at the medium substrate 2B in the following, the floor is square, and side length is Gs=7.5mm, quadrangle
It is circular arc, the arc radius R=0.5mm, central angle is 90 °.
The floor unslotted, the influence because differential antennae is connected with radio-frequency differential circuit, vulnerable to radio circuit.
The single layer muscle model is cube, and electrical parameter is arranged with specific reference to human muscle's electromagnetic property.
As shown in Fig. 2, the low section differential feed circular polarized antenna that can be used for capsule endoscope system is apart from muscle
Model upper surface dp=4mm, antenna distance model lower surface and edge all distances are all 40mm.
It is emulated as shown in figure 3, the antenna is placed in human muscle's model, reflectance difference coefficient bandwidth (is less than -10dB)
It is 2.365-2.485GHz, axial ratio bandwidth (being less than 3dB) is 2.39-2.54GHz, covers 2.45GHz-ISM (2.40-
2.48GHz) frequency range.
Shown in Fig. 4 (a)~Fig. 4 (b), when the antenna is implanted into single layer musculature model in centre frequency 2.45GHz
Actual gain analogous diagram in lower XOZ and YOZ plane, the aerial radiation maximum gain -25.4dBi.In plane ± 40 ° XOZ
Cross polarization ratio is greater than 15dB, and cross polarization ratio is greater than 20dB in plane ± 40 ° YOZ.
As shown in figure 5, the radiation gain directional diagram when the antenna is implanted into the manikin stomach of closer human body.
The antenna is cracked using center grooved and surrounding, is extended electric current active path, is realized the miniaturization of antenna；Adjusting is cut
The long position with short rectangular joint-cutting of the arm of angle, adjusts phase, realizes circular polarisation and improves circular polarisation purity；Can be had using differential configuration
Effect inhibits common-mode signal, while being conveniently attached to radio-frequency differential circuit.
The present invention uses high dielectric constant substrate, reduces antenna size, and introducing surrounding, which is cracked, extends current path, adjusts
Phase is saved, realizes circular polarisation, effectively inhibition Path Loss is easy to be connected directly with radio circuit, day using differential feed structure
Line catercorner length is less than the diameter of medical capsule, and antenna outer surface plates one layer of biological insulating layer, avoids antenna and tissue
Directly contact.The advantages that present invention has size small, low section, bandwidth of operation and wider axial ratio bandwidth, is suitble to apply to capsule
Endoscopic system field.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (6)
1. a kind of low section differential feed circular polarized antenna for capsule endoscope system, which is characterized in that including metal spoke
Unit, upper and lower layer medium substrate and floor are penetrated, the metal radiation unit is between upper and lower layer medium substrate, the floor
Positioned at the lower surface of layer dielectric substrate, the metal radiation unit is made of the square patch that quadrangle is circular arc；
The center of square patch is provided with the square groove with a pair of of corner cut, and the pair of corner cut is located at the diagonal of square patch
On, the corner cut is equilateral triangle；
Two L-type seams and two short rectangular seam are provided on the square patch, two L-types seam and two short rectangular seam are equal
Symmetrical about metal radiation unit center, the inflection point of two L-types seam is located on the diagonal line of square patch, and described two
The starting point of the short rectangular seam of item is located on the horizontal joint of two L-types seam, and terminal is at square patch edge.
2. low section differential feed circular polarized antenna according to claim 1, which is characterized in that it further include symmetric coaxial,
The symmetric coaxial includes that upper right is coaxial and lower-left is coaxial, and symmetrical about metal radiation unit center.
3. low section differential feed circular polarized antenna according to claim 1, which is characterized in that the arc radius is
0.5mm, central angle are 90 degree.
4. low section differential feed circular polarized antenna according to claim 1, which is characterized in that the floor is that quadrangle is
The square of circular arc.
5. low section differential feed circular polarized antenna according to claim 1, which is characterized in that further include biological insulating layer
Film is wrapped in the outer surface of entire antenna.
6. low section differential feed circular polarized antenna according to claim 1, which is characterized in that band a pair of corner cut
Square groove is located at the inside of two L-type seam institute's enclosing regions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610323162.8A CN105846074B (en) | 2016-05-13 | 2016-05-13 | A kind of low section differential feed circular polarized antenna for capsule endoscope system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610323162.8A CN105846074B (en) | 2016-05-13 | 2016-05-13 | A kind of low section differential feed circular polarized antenna for capsule endoscope system |
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| CN105846074A CN105846074A (en) | 2016-08-10 |
| CN105846074B true CN105846074B (en) | 2019-08-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919524B (en) * | 2017-12-11 | 2023-06-23 | 南京信息工程大学 | Capsule antenna |
| CN111146585B (en) * | 2020-01-21 | 2023-02-17 | 京东方科技集团股份有限公司 | Antenna unit and antenna device |
| CN112054288B (en) * | 2020-09-04 | 2022-11-08 | 青岛海信移动通信技术股份有限公司 | Electronic device |
| CN114221121A (en) * | 2021-12-23 | 2022-03-22 | 上海交通大学 | Circular polarized antenna communication system for artificial anal sphincter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305069A (en) * | 2015-10-26 | 2016-02-03 | 华南理工大学 | Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band |
| CN205752529U (en) * | 2016-05-13 | 2016-11-30 | 华南理工大学 | A kind of low section differential feed circular polarized antenna for capsule endoscope system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3685676B2 (en) * | 2000-02-18 | 2005-08-24 | アルプス電気株式会社 | Circularly polarized microstrip antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305069A (en) * | 2015-10-26 | 2016-02-03 | 华南理工大学 | Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band |
| CN205752529U (en) * | 2016-05-13 | 2016-11-30 | 华南理工大学 | A kind of low section differential feed circular polarized antenna for capsule endoscope system |
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