CN110416710B - Wearable microstrip antenna structure of small-size weaving - Google Patents
Wearable microstrip antenna structure of small-size weaving Download PDFInfo
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- CN110416710B CN110416710B CN201910594572.XA CN201910594572A CN110416710B CN 110416710 B CN110416710 B CN 110416710B CN 201910594572 A CN201910594572 A CN 201910594572A CN 110416710 B CN110416710 B CN 110416710B
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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
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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
- 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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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Abstract
The invention relates to a small-sized textile wearable microstrip antenna structure which comprises a dielectric substrate, wherein an upper-layer radiation patch and a bottom-layer ground plate are respectively arranged at the front end and the back end of the dielectric substrate, the upper-layer radiation patch is rectangular, a T-shaped groove is respectively formed in one vertical edge and one horizontal edge of the rectangle, and a rectangular groove is further formed in the horizontal edge provided with the T-shaped groove. The invention enables the size of the antenna to be reduced and the bandwidth to be increased without increasing the back radiation of the antenna.
Description
Technical Field
The invention relates to the technical field of textile wearable, in particular to a small textile wearable microstrip antenna structure.
Background
The antenna plays an important role in a wireless communication system, and with the development of internet communication technology, a body area network (body area network) capable of promoting the communication between a human body and an object gradually becomes a research hotspot. The body area network is a network distributed around a human body, and is mainly used for detecting and transmitting physiological data of the human body, and is cooperated with other networks to contain the human body as a part of the whole network. In a body area network, a wearable antenna assumes the signal transmission function of a human body and an object. Wearable antennas typically use a conductive fabric or flexible material as a substrate to facilitate the conformal fit of the antenna to the human body. Wearable antennas are mostly made of flexible materials with high dielectric constants, such as polydimethylsiloxane, Kapton, Vinyl, matsushita R-F770 materials, and the like. However, the common type of these flexible materials and textile garments is much smaller than that of textile materials, so the research on the preparation of wearable antennas from textile materials is more and more important, and the textile wearable antennas are required to meet the frequency bandwidth and frequency band range, and simultaneously, the miniaturization of the antennas and the reduction of the damage to the comfort of the textile materials are realized as much as possible.
The microstrip antenna has the advantages of small volume, light weight, simple manufacturing process, easy realization of conformality and the like, and is suitable to be selected as a textile wearable antenna. The miniaturization mode of the microstrip antenna comprises meander, loading and the like, wherein the realization mode of the meander is simplest, and the miniaturization design requirement of the textile wearable antenna is easily met. The meander technology, namely, a slot is formed on an antenna radiation source patch, the current path on the surface of an antenna is increased, the resonant frequency of the antenna is reduced, the size of the antenna is further reduced, and the bandwidth of the antenna can be increased by changing the slot structure.
Guo et al proposed an embedded inverted T-slot circular microstrip patch antenna with dual frequencies of 2.4GHz and 5.5GHz, which reduces the size of the antenna and generates dual frequency bands by loading a T-slot on the surface of the antenna, but does not increase the bandwidth of the microstrip antenna at a single frequency band, and the dielectric substrate is a rigid FR4 printed circuit board, which is not suitable for being worn. Muregan, S et al propose a multi-frequency microstrip antenna for wireless applications, which is also optimized by loading a T-shaped slot and changing the size of the T-shaped slot to obtain a multi-frequency microstrip antenna, the multi-frequencies being 1.57GHz, and 3.4 GHz. Asutosh Dhar Dwivedi et al propose a four-corner arc microstrip patch antenna applied to C wave band, X wave band and Ku wave band, through loading T type groove on the antenna ground plate, realized 3.68GHz to 16.37 GHz's bandwidth, but do not cover the bluetooth frequency channel, and because carry out the fluting on the floor, increased the radiation in a reverse direction of antenna, be unfavorable for wearable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a small-sized textile wearable microstrip antenna structure, so that the back radiation of an antenna cannot be increased while the size of the antenna is reduced and the bandwidth is increased.
The technical scheme adopted by the invention for solving the technical problems is as follows: the small-sized textile wearable microstrip antenna structure comprises a dielectric substrate, wherein an upper-layer radiation patch and a bottom-layer ground plate are respectively arranged at the front end and the back end of the dielectric substrate, the upper-layer radiation patch is rectangular, a first vertical groove part is arranged on one vertical edge of the rectangle, a first horizontal groove part is arranged in the rectangle, and the first vertical groove part and the first horizontal groove part are connected to form a first T-shaped groove; a second horizontal groove part is formed in one horizontal edge of the rectangle, a second vertical groove part is formed in the rectangle, the second horizontal groove part is connected with the second vertical groove part to form a second T-shaped groove, and a rectangular groove is further formed in the horizontal edge where the second horizontal groove part is formed.
The dielectric substrate is made of textile materials with dielectric constants smaller than 3.9.
The upper-layer radiation patch is manufactured by printing conductive silver paste on the dielectric substrate in a screen printing mode.
The length of the first horizontal groove part of the first T-shaped groove is 18mm, and the length of the second vertical groove part of the second T-shaped groove is 10 mm.
The length of the rectangular groove extending into the upper layer radiation patch is 14 mm.
The width of the gaps among the first T-shaped groove, the second T-shaped groove and the rectangular groove is 0.5-1 mm.
The feeding mode of the microstrip antenna structure is coaxial feeding.
The distance from the center of the upper-layer radiating patch to the feed point is 14mm, and the feed point is positioned on the central vertical line of the upper-layer radiating patch.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the antenna provided by the invention realizes the requirement of miniaturization, and meets the requirements of flexibility and the like of the antenna when the antenna is worn; the antenna generates double resonance points while reducing the size of the antenna by opening double T-shaped grooves on the basis of a rectangular microstrip antenna; the double resonance points are close to and combined by forming the rectangular groove and adjusting the size of the T-shaped groove, so that the bandwidth of the antenna is increased; the whole antenna is simple in structure, and the resonance point is easy to manufacture and adjust to match the frequency band applied by the antenna.
Drawings
FIG. 1 is a schematic view of the overall structure of a textile wearable microstrip antenna according to the present invention;
FIG. 2 is a schematic diagram of return loss of a textile wearable microstrip antenna according to the present invention;
fig. 3 is a gain parameter schematic diagram of the textile wearable microstrip antenna of the invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to a small-sized textile wearable microstrip antenna structure, which comprises a dielectric substrate 1, wherein an upper-layer radiation patch 2 and a bottom-layer ground plate are respectively arranged at the front end and the back end of the dielectric substrate 1, the upper-layer radiation patch 2 is rectangular, a vertical edge and a horizontal edge of the rectangle are respectively provided with a T-shaped groove 3, and the horizontal edge provided with the T-shaped groove 3 is also provided with a rectangular groove 4. The feeding mode of the microstrip antenna structure is coaxial feeding.
The medium substrate can be made of a textile material with a low dielectric constant, for example, a polyester felt with a low dielectric constant is adopted, the relative dielectric constant of the polyester felt is 1.25, the dielectric loss of the polyester felt is 0.02, and the comfort of the fabric is not changed because the surface of the selected polyester felt is not subjected to coating treatment. If textile materials with higher dielectric constants are selected, the size of the antenna can be further reduced, meanwhile, the antenna is not limited to polyester textile materials, and related textiles such as cotton, hemp, silk, wool, chemical fiber and the like can also be selected. The upper radiation patch can be manufactured by printing conductive silver paste on the dielectric substrate in a screen printing mode.
The invention is further illustrated by the following specific example.
As shown in fig. 1, the small-sized textile wearable microstrip antenna structure loaded with the T-shaped groove in the present embodiment is divided into six parts, which are a dielectric substrate 1, an antenna radiation source patch 2, a T-shaped groove 3, a rectangular groove 4, a ground plate, and a coaxial feeding point 5. The dielectric substrate 1 is a polyester felt with a thickness of 3mm, the dimension is 70mm x 70mm, the relative dielectric constant epsilon r is 1.25, and the loss tangent tan delta is 0.02. The upper surface of the dielectric substrate 1 is provided with an antenna radiation source patch 2, a rectangular groove 4 and two T-shaped grooves 3, and the lower surface of the dielectric substrate 1 is provided with a grounding plate and a 50 omega coaxial feed point. The specific parameters of the antenna are shown in table 1.
TABLE 1 antenna parameter table
The antenna works in free space, and in order to prepare the antenna with good performance and meeting the design requirement, a model needs to be established in HFSS electromagnetic simulation software, relevant parameters are optimized, and the performance with the resonance point of 2.45GHz is analyzed and calculated. And after the simulation design is finished, printing conductive silver paste on the polyester felt by utilizing a screen printing technology according to the obtained optimal size parameter to manufacture the radiation source patch of the antenna. In order to reduce the usage amount of the conductive silver paste, the antenna grounding plate is adhered to the lower surface of the dielectric substrate by adopting copper foil, and the designed textile wearable antenna is finally obtained. In addition, in order to achieve good wearability and practicability, the ground plate of the antenna can also be prepared by a screen printing method.
In order to reduce the size of the antenna and increase the bandwidth of the antenna, as shown in fig. 1, two T-shaped grooves are formed on the antenna radiation source patch to increase the current path on the surface of the antenna, reduce the size of the radiation source patch, and simultaneously, double resonance points appear near 2.45 GHz. On the basis, a rectangular groove is formed in the antenna radiation source patch, and the size and the position of a feed point of the two T-shaped grooves are adjusted simultaneously, so that the two resonance points are close to each other, and an ideal bandwidth is achieved.
In order to improve the feasibility of manufacturing the textile wearable microstrip antenna, the effective gap widths of a rectangular groove and a T-shaped groove loaded by an antenna radiation source patch are analyzed, the width of the slotted gap is within the range of 0.5 mm-1 mm, and the performance of the antenna is within the design requirement.
The simulation in the design of the invention is realized in full-wave simulation software HFSS based on finite element algorithm, and the final size is determined.
The return loss parameters (S) of the antenna were tested using a vector network analyzer11) As shown in FIG. 2, the relative bandwidth is 10.6% (2.45GHz, 2.39-2.65 GHz). The gain of the antenna tested in the microwave dark room is shown in fig. 3, and it can be seen that the maximum gain obtained by the antenna at 2.45GHz is 4.02 dB. The result shows that the return loss parameter S11 of the antenna realizes 2.39 GHz-2.65 GHz, and the maximum gain of the antenna is 4.02dB in the frequency band range. Meanwhile, the frequency band of the S11 parameter completely contains the Bluetooth frequency band (2400-2483.5 MHz), so that the designed antenna can be applied to a wireless communication system of the frequency band, and the use stability of the antenna is improved. The invention gives full play to the advantages of low profile, small volume and the like of the microstrip antenna, further reduces the size of the antenna, widens the bandwidth of the microstrip antenna, and simultaneously adopts flexible textile materials as the dielectric substrate of the antenna, so that the designed antenna meets the wearable requirement.
Claims (8)
1. A wearable micro-strip antenna structure for small textiles comprises a dielectric substrate, wherein an upper radiation patch and a bottom ground plate are respectively arranged at the front end and the back end of the dielectric substrate, and the wearable micro-strip antenna structure is characterized in that the upper radiation patch is rectangular, a first vertical groove part is arranged on one vertical edge of the rectangle, a first horizontal groove part is arranged in the rectangle, and the first vertical groove part and the first horizontal groove part are connected to form a first T-shaped groove; a second horizontal groove part is formed in one horizontal edge of the rectangle, a second vertical groove part is formed in the rectangle, the second horizontal groove part is connected with the second vertical groove part to form a second T-shaped groove, and a rectangular groove is further formed in the horizontal edge where the second horizontal groove part is formed.
2. The small textile wearable microstrip antenna structure of claim 1 wherein the dielectric substrate is made of a textile material having a dielectric constant of less than 3.9.
3. The small-sized textile wearable microstrip antenna structure according to claim 1, wherein the upper layer radiation patch is manufactured by printing conductive silver paste on the dielectric substrate in a screen printing manner.
4. The small textile wearable microstrip antenna structure of claim 1 wherein the first horizontal slot portion of the first T-slot has a length of 18mm and the second vertical slot portion of the second T-slot has a length of 10 mm.
5. The small textile wearable microstrip antenna structure of claim 1 wherein the rectangular slot has a length of 14mm extending into the upper radiating patch.
6. The structure of the small-sized textile wearable microstrip antenna according to claim 1, wherein the first T-shaped groove, the second T-shaped groove and the rectangular groove have a gap width of 0.5mm to 1 mm.
7. The small textile wearable microstrip antenna structure of claim 1 wherein the microstrip antenna structure is fed in a coaxial feed.
8. The small textile wearable microstrip antenna structure of claim 1 wherein the upper layer radiating patch center to feed point distance is 14mm, the feed point being located on the central vertical line of the upper layer radiating patch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910594572.XA CN110416710B (en) | 2019-07-03 | 2019-07-03 | Wearable microstrip antenna structure of small-size weaving |
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| CN201910594572.XA CN110416710B (en) | 2019-07-03 | 2019-07-03 | Wearable microstrip antenna structure of small-size weaving |
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| CN110416710A CN110416710A (en) | 2019-11-05 |
| CN110416710B true CN110416710B (en) | 2021-02-19 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203760651U (en) * | 2013-11-27 | 2014-08-06 | 哈尔滨飞羽科技有限公司 | Multiband electromagnetic band gap structure based on T-shaped groove |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI239120B (en) * | 2004-05-12 | 2005-09-01 | Arcadyan Technology Corp | Microstrip antenna having slot structure |
| CN103794874B (en) * | 2014-01-18 | 2016-03-30 | 中国计量学院 | Double-T open flume type double-frequency micro-strip antenna |
| CN206697603U (en) * | 2017-05-26 | 2017-12-01 | 华东交通大学 | A kind of ultra wide band mimo antenna based on defect ground structure and with band-stop response |
| CN109244654B (en) * | 2018-08-20 | 2022-09-27 | 中国电力科学研究院有限公司 | Patch antenna for television interference measurement, television interference measurement device and method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203760651U (en) * | 2013-11-27 | 2014-08-06 | 哈尔滨飞羽科技有限公司 | Multiband electromagnetic band gap structure based on T-shaped groove |
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