CN110600862A - Coupling feed dual-frequency PIFA antenna applied to Internet of things - Google Patents
Coupling feed dual-frequency PIFA antenna applied to Internet of things Download PDFInfo
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- CN110600862A CN110600862A CN201910848574.7A CN201910848574A CN110600862A CN 110600862 A CN110600862 A CN 110600862A CN 201910848574 A CN201910848574 A CN 201910848574A CN 110600862 A CN110600862 A CN 110600862A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
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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
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a coupling-feed dual-frequency PIFA antenna applied to the Internet of things, which comprises a feed patch, a short-circuit patch, a grounding plate and a radiation patch, wherein the grounding plate and the radiation patch are respectively arranged on different planes, and an air cavity is directly formed between the radiation patch and the grounding plate; the short circuit patch is connected between the radiation patch and the ground plate, and the feed patch is arranged above the radiation patch and connected to the coaxial conductor. The dual-frequency PIFA antenna can be applied to the coupling feed technology of the Internet of things, and can meet the communication requirements of 1.8GHz and 2.4GHz frequency bands.
Description
Technical Field
The invention relates to the technical field of PIFA antennas, in particular to a dual-frequency PIFA antenna applied to coupling feed of the Internet of things.
Background
With the development of wireless communication technology, the internet of things becomes a research hotspot in the field of wireless communication. One key technology in the internet of things system is radio frequency technology, and the performance of a sensor antenna can have a strong influence on the performance of the whole internet of things system. Therefore, designing a suitable sensor antenna with excellent performance is extremely important for the whole internet of things system. Due to the diversity of application scenarios of the sensor of the internet of things, the sensor Antenna is required to have the characteristics of low profile, small size and the like, so that the sensor Antenna type can adopt a monopole Antenna, a microstrip Antenna, a PIFA (Planar Inverted-F Antenna) Antenna and the like.
At present, frequency bands adopted by the communication of the internet of things comprise a plurality of frequency bands. In order to enable the sensor of the internet of things to work in different frequency bands, the sensor antenna is required to cover as many frequency bands as possible, and the traditional PIFA antenna has the defects of large size, insufficient impedance and gain and the like, and cannot meet the communication requirements of the frequency bands of 1.8GHz and 2.4 GHz.
Disclosure of Invention
The invention aims to provide a coupling-fed dual-frequency PIFA antenna which can be applied to the coupling-fed technology of the Internet of things and simultaneously meets the communication requirements of 1.8GHz and 2.4GHz frequency bands.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a dual-frequency PIFA antenna applied to coupling feed of the Internet of things comprises a feed branch, a short circuit branch, a grounding plate and a radiation patch, wherein the grounding plate and the radiation patch are respectively arranged on different planes, and an air cavity is directly formed between the radiation patch and the grounding plate; the short circuit patch is connected between the radiation patch and the grounding plate, and the feed branch is arranged above the radiation patch and connected to the coaxial conductor.
The invention has the beneficial effects that: the invention is different from the prior art, and can effectively adjust the working frequency and impedance matching of the proposed dual-frequency PIFA antenna by adjusting the length of the branch of the radiation patch, the height between the radiation patch and the ground plate and the width of the short-circuit branch.
And because the short-circuit branch is arranged on the side surface of the dielectric substrate, the adverse effects of working frequency offset, impedance mismatch and the like caused by too low height between the radiation patch and the ground plane can be effectively improved by adjusting the width of the short-circuit branch, so that the section of the proposed dual-frequency PIFA antenna can be reduced, and the dual-frequency PIFA antenna is more suitable for the application of communication of the Internet of things.
Drawings
Fig. 1 is a schematic structural top view of a coupled feeding dual-band PIFA antenna applied to the internet of things provided by the present invention;
fig. 2 is a schematic side view of a coupled feeding dual-band PIFA antenna applied to the internet of things provided by the present invention;
fig. 3 is a schematic front view of a coupled feeding dual-band PIFA antenna applied to the internet of things provided by the present invention;
fig. 4 is a schematic diagram of the variation of the S parameter with m of the dual-band PIFA antenna of the coupling feed applied to the internet of things provided by the present invention;
fig. 5 is a schematic diagram of the variation of the S parameter with h of the dual-band PIFA antenna of the coupling feed applied to the internet of things provided by the present invention;
fig. 6 shows the size-optimized S parameter of the dual-band PIFA antenna applied to the coupling feed of the internet of things according to the present invention;
FIG. 7 shows the 1.8GHz radiation pattern of the dual-band PIFA antenna applied to the coupling feed of the Internet of things
Fig. 8 is a 2.4GHz radiation pattern of the coupled feeding dual-band PIFA antenna provided by the present invention applied to the internet of things;
reference numerals:
1. a ground plate; 2. a radiation patch; 3. a feed branch; 4. short circuit branch knots; 21. long branch knots; 22. short branch knots.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
One or more embodiments of the present invention are described in further detail below with reference to the attached figures.
As shown in fig. 1-3, an embodiment is provided, which is a coupled feeding dual-band PIFA antenna applied to the internet of things, and includes a feeding branch 3, a short-circuit branch 4, a ground plate 1 and a radiation patch 2 respectively disposed on different planes, and the radiation patch 2 and the ground plate 1 directly form an air cavity; the short-circuit patch is connected between the radiating patch 2 and the ground plate 1, and the feed stub 3 is disposed above the radiating patch 2 and connected to the coaxial conductor.
As shown in fig. 1, the radiation patch 2 includes at least two radiation branches, and the two radiation branches are symmetrically disposed. And two radiation branches are mainly symmetrically arranged at the central position relative to the grounding plate 1, so that the whole volume of the antenna can be effectively reduced. And the two radiation branches are symmetrically arranged, so that the space area is saved to the maximum extent, and the effects of saving space and reducing volume are achieved.
Further, the radiation branch can be decomposed into a long branch 21 and a short branch 22, wherein the long branch 21 is C-shaped and has two ports, one of the ports of the long branch 21 is connected to the short branch 22, which is a fixed port, and the other end of the long branch 21 is close to the short branch 22 and has a gap with the short branch 22, which is a free port. The C-shaped long branch 21 can further reduce the volume of the antenna while ensuring the length of the current path.
Also, further, in order to further reduce the volume while ensuring the normal operation of the antenna, it is necessary to place the outer edges of the long branches 21 close to different edges of the ground plate 1. As shown in fig. 1, the long stub 21 is formed of three stubs having three outer edges that are respectively adjacent to the top edge, the left or right side edge, and the bottom edge of the ground plate 1. The short branches 22 of the radiation branches are rectangular strips, the short branches 22 are vertically arranged, and the short branches 22 of the two radiation branches are symmetrical back to back. The embodiment reduces the volume of the antenna to the maximum extent, and effectively solves the problem that the traditional PIFA antenna has overlarge volume.
In this embodiment, the communication requirements of the internet of things mainly include communication requirements of frequency bands of 1.8GHz and 2.4 GHz. Wherein, the long branch 21 is used for radiating and generating 1.8GHz frequency of low frequency, and the short branch 22 is used for radiating and generating 2.4GHz frequency of high frequency. The feed patch comprises two feed branches 3, each feed branch 3 is respectively connected to one of the short branches 22 of the radiation patch 2, and power is supplied to the radiation branches in a coupling feed mode.
The shorting patch is arranged in a lateral position as shown in fig. 2 and is connected between the radiating patch 2 and the ground plane 1. The height between the ground plate 1 and the radiation patch 2 is the height of the short circuit patch, and the height is recorded as h. And the short circuit includes two short circuit branches 4 that centrosymmetric set up, and two short circuit branches 4 are connected to one of them radiation branch of radiation paster 2 respectively, and all are connected to ground plate 1. And the width of the short-circuit branch 4 is recorded as m and is used for adjusting the low-frequency and the scattering parameters of the antenna, and the height of the short-circuit branch 4 is used for adjusting the scattering parameters of the low-frequency and the high-low frequency of the antenna.
In practical application, the working frequency bands of the internet of things antenna are 1.8GHz and 2.4 GHz. In the present embodiment, the two operating frequencies of the antenna are generated by the radiation of the two branches of the radiating patch 2, respectively. Each radiation branch comprises a long branch 22 and a short branch 22, wherein the low frequency of 1.8GHz is generated by the radiation of the long C-shaped branch 21, and the high frequency of 2.4GHz is generated by the radiation of the short rectangular branch 22. By adjusting the lengths of the two branches, two working frequencies of the antenna can be respectively adjusted.
Meanwhile, the height h of the radiating patch 2 from the ground plane and the width m of the short-circuit branch 4 also affect the operating frequency and impedance matching of the antenna. As shown in fig. 4, when S11 of the dual-band PIFA antenna varies with h, it can be seen that as h increases, the low-frequency operating frequency and S11 at the low frequency of the antenna decrease, while the high-frequency operating frequency of the antenna does not vary much, but S11 at the high frequency increases. Fig. 5 shows the change in S11 for a dual band PIFA antenna as the width of the shorting stub 4 changes. As can be seen from the figure, as the width m of the short-circuit branch 4 increases, the low-frequency operating frequency of the antenna increases, and S11 at the low frequency decreases, which has little influence on the high-frequency operating frequency of the antenna.
As shown in fig. 6, the height h between the ground plane and the radiating patch 2 is 5mm, the width m of the shorting stub 4 is 8mm, and the S11 parameter of the antenna after size optimization is shown in fig. 6, and it can be seen from the figure that the S11 of the antenna at 1.8GHz and 2.4GHz is-13.1 dB and-15.8 dB, respectively, indicating that the proposed dual-frequency PIFA antenna has good impedance matching at two operating frequencies. The problem that the impedance of the traditional PIFA antenna is not good enough is solved.
As further shown in fig. 7-8, the radiation patterns of the antenna at two operating frequencies show that the antenna has stable radiation gain at both operating frequencies. The problem of insufficient radiation gain of the traditional PIFA antenna can be solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a dual-frenquency PIFA antenna for coupling feed of thing networking which characterized in that: the antenna comprises a feed patch, a short circuit patch, a grounding plate and a radiation patch which are respectively arranged on different planes, wherein an air cavity is directly formed between the radiation patch and the grounding plate; the short circuit patch is connected between the radiation patch and the ground plate, and the feed patch is arranged above the radiation patch and connected to the coaxial conductor.
2. The dual-band PIFA antenna for coupling feeding of internet of things as claimed in claim 1, wherein: the radiation patch comprises at least two radiation branches, and the two radiation branches are symmetrically arranged and are parallel to the ground plate.
3. The dual-band PIFA antenna for coupling feed of internet of things as claimed in any of claims 1-2, wherein: the radiation branches comprise long branches and short branches, the long branches are C-shaped and provided with two ends, one end of each long branch is connected with the corresponding short branch, and a gap is reserved between the other end of each long branch and the corresponding short branch.
4. The dual-band PIFA antenna for coupling feeding of the Internet of things as claimed in claim 3, wherein: the outer edges of the long branches are respectively close to different edges of the grounding plate.
5. The dual-band PIFA antenna for coupling feeding of the Internet of things as claimed in claim 4, wherein: the long branches are used to generate low frequency.
6. The dual-band PIFA antenna for coupling feeding of the Internet of things as claimed in claim 3, wherein: the short branches of the two radiation branches are symmetrical back to back.
7. The dual-band PIFA antenna for coupling feeding of the Internet of things as claimed in claim 6, wherein: the short branches are used to generate high frequency.
8. The dual-band PIFA antenna for coupling feeding of internet of things as claimed in claim 1, wherein: the feed patch comprises two feed branches, and each feed branch is connected to one of the short branches of the radiation patch and used for coupling feed.
9. The dual-band PIFA antenna for coupling feeding of internet of things as claimed in claim 1, wherein: the short-circuit patch comprises two short-circuit branches which are arranged in central symmetry, and the width of each short-circuit branch is used for adjusting the low-frequency and the scattering parameters of the antenna.
10. The dual-band PIFA antenna for coupling feeding of the internet of things as claimed in claim 9, wherein: the two short-circuit branches are respectively connected to one of the radiation branches of the radiation patch and are both connected to the ground plate, and the height of the short-circuit branches is used for adjusting the scattering parameters of the low-frequency and the high-low frequency of the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848574.7A CN110600862B (en) | 2019-09-09 | 2019-09-09 | Coupling feed dual-frequency PIFA antenna applied to Internet of things |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848574.7A CN110600862B (en) | 2019-09-09 | 2019-09-09 | Coupling feed dual-frequency PIFA antenna applied to Internet of things |
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| Publication Number | Publication Date |
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| CN110600862A true CN110600862A (en) | 2019-12-20 |
| CN110600862B CN110600862B (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910848574.7A Active CN110600862B (en) | 2019-09-09 | 2019-09-09 | Coupling feed dual-frequency PIFA antenna applied to Internet of things |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993550A (en) * | 2021-02-09 | 2021-06-18 | 维沃移动通信有限公司 | Antenna module and electronic equipment |
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| US20020135521A1 (en) * | 2001-03-21 | 2002-09-26 | Amphenol-T&M Antennas. | Multiband PIFA antenna for portable devices |
| JP2003124742A (en) * | 2001-10-11 | 2003-04-25 | Samsung Electronics Co Ltd | Antenna |
| CN1153314C (en) * | 1998-07-09 | 2004-06-09 | 艾利森电话股份有限公司 | Printed twin spiral dual band antenna |
| US20060176226A1 (en) * | 2005-02-04 | 2006-08-10 | Samsung Electronics Co., Ltd. | Dual-band planar inverted-F antenna |
| CN104022354A (en) * | 2014-06-18 | 2014-09-03 | 广东工业大学 | Narrow-spacing low-SAR high-isolation MIMO antenna |
| CN208489353U (en) * | 2018-07-10 | 2019-02-12 | 安徽建筑大学 | A kind of compact dual-frequency PIFA antenna applied to WLAN |
-
2019
- 2019-09-09 CN CN201910848574.7A patent/CN110600862B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153314C (en) * | 1998-07-09 | 2004-06-09 | 艾利森电话股份有限公司 | Printed twin spiral dual band antenna |
| US20020135521A1 (en) * | 2001-03-21 | 2002-09-26 | Amphenol-T&M Antennas. | Multiband PIFA antenna for portable devices |
| JP2003124742A (en) * | 2001-10-11 | 2003-04-25 | Samsung Electronics Co Ltd | Antenna |
| US20060176226A1 (en) * | 2005-02-04 | 2006-08-10 | Samsung Electronics Co., Ltd. | Dual-band planar inverted-F antenna |
| CN104022354A (en) * | 2014-06-18 | 2014-09-03 | 广东工业大学 | Narrow-spacing low-SAR high-isolation MIMO antenna |
| CN208489353U (en) * | 2018-07-10 | 2019-02-12 | 安徽建筑大学 | A kind of compact dual-frequency PIFA antenna applied to WLAN |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993550A (en) * | 2021-02-09 | 2021-06-18 | 维沃移动通信有限公司 | Antenna module and electronic equipment |
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| CN110600862B (en) | 2021-07-06 |
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