CN203536566U - Circularly polarized broadband antenna - Google Patents
Circularly polarized broadband antenna Download PDFInfo
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- CN203536566U CN203536566U CN201320665287.0U CN201320665287U CN203536566U CN 203536566 U CN203536566 U CN 203536566U CN 201320665287 U CN201320665287 U CN 201320665287U CN 203536566 U CN203536566 U CN 203536566U
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- power splitter
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Abstract
The utility model relates to a circularly polarized broadband antenna. The circularly polarized broadband antenna comprises an insulating medium plate, a feed network located on the front surface of the insulating medium plate, a metal bottom plate located on the back surface of the insulating medium plate and four metal radiation array elements which are installed on the front surface of the insulating medium plate and connected with the feed network. The feed network is used to convert a signal which is input from an input end into four paths of signals which have a uniform amplitude and phase differences of which are all 90 degrees, and the four paths of the signals are output to the four metal radiation array elements from four output ends; the metal bottom plate is a copper coating and is grounded; and the metal radiation array elements are PIFA type array elements. Compared with the prior art, the circularly polarized broadband antenna provided by the utility model has the advantages of wide-axial-ratio bandwidth, circular polarization, the high gain, the small size, stable performance, easy batch production and the like. The circularly polarized broadband antenna overcomes defects of narrow bandwidth and the large size of single-port feed, and complexity of a multi-port feed system is also simplified; performance is improved; and the circularly polarized broadband antenna is more suitable for application in the RFID industry.
Description
Technical field
The utility model relates to RFID applied technical field, particularly a kind of circular polarization broad-band antenna.
Background technology
Radio-frequency (RF) identification is a kind of contactless automatic identification technology.In RFID(Radio Frequency Identification, radio-frequency (RF) identification) in system, identifying information leaves in electric data carrier, and electric data carrier becomes transponder.The identifying information of depositing in transponder is read by reader, and in some applications, reader not only can be read the information of depositing, and can be to transponder data writing, and this read-write operation is realized by bipartite radio communication.Microstrip antenna, as directional antenna form conventional in rfid system, has extremely important meaning to the development of RFID and application.
Since proposing from the concept of microstrip antenna, due to it have simple in structure, volume is little, lightweight, low section, easily and the advantage such as carrier is conformal, has been widely used in the fields such as satellite communication, radar, radio-frequency (RF) identification, navigation.Wherein circular polarization microstrip antenna is again because the advantage that antenna received that its circularly polarised wave that can accept any incoming wave polarizing and its radiation can be polarized arbitrarily is more and more favored.The key that microstrip antenna produces circularly polarised wave is that generation amplitude equates, two mutually orthogonal line polarization waves of phase phasic difference 90 degree produce two line polarization waves of quadrature all on room and time.
For reaching above-mentioned requirements, circular polarization microstrip antenna structurally mainly can be divided into following three kinds of forms: single-point feedback, two point feed or four-point feed.Wherein single-point feedback circular polarization microstrip antenna structure is the simplest, but that shortcoming is axial ratio bandwidth is narrower, and practicality is not strong; Two point feed can be expanded Circular polarization ratio bandwidth to some extent, but has all adopted sandwich construction, has destroyed the low section of antenna; The antenna of four-point feed is again due to its complexity and unsteadiness, and utilization rate is lower.
Utility model content
The purpose of this utility model is, overcomes the shortcoming of the narrow bandwidth that single-point feedback causes, and the circular polarization broad-band antenna of a kind of wide axial ratio bandwidth, miniaturization, simple in structure, stable performance is provided.
For achieving the above object, the utility model is by the following technical solutions:
A circular polarization broad-band antenna, comprise insulation medium board, be positioned at insulation medium board front feeding network, be positioned at the metal base plate at the insulation medium board back side and be installed on four metal radiation a period of time that insulation medium board is positive and be connected with feeding network;
Described feeding network has an input and four outputs, comprise several interconnective power splitter and phase shifters, for the signal from input input being converted into four tunnel constant amplitudes, phase difference, be followed successively by the signal of 90 degree, from four outputs, export to four metal radiation a period of time respectively;
Described metal base plate, for covering copper layer, is connected to ground;
Described metal radiation a period of time is a period of time of PIFA form.
Preferably, the input of described feeding network passes through SMA probe feed or welds feed by coaxial line.
Preferably, described four metal radiation a period of time surround clockwise or counterclockwise a square, the center that its center is insulation medium board above feeding network.
Preferably, described four metal radiation a period of time, centered by the center of insulation medium board, arrange radially.
Preferably, described insulation medium board is circle or rectangle.
Preferably, described feeding network comprises the first to the 3rd power splitter and the first to the 3rd phase shifter; The input of the 3rd power splitter is the input of feeding network, and an output of the 3rd power splitter is connected with the input of the first power splitter, and another output is connected to the input of the second power splitter through the first phase shifter; An output of the first power splitter is connected to the first output of feeding network through the second phase shifter, another output of the first power splitter is connected to the second output of feeding network; An output of the second power splitter is connected to the 4th output of feeding network through the 3rd phase shifter, another output of the second power splitter is connected to the 3rd output of feeding network.
Preferably, described insulation medium board is polyfluortetraethylene plate or FR-4 insulation board.
Preferably, described metal radiation a period of time consists of stainless steel, foreign copper-nickel alloy or PCB.
Preferably, described phase shifter is the phase shifter of co-planar waveguide or microstrip line form.
Preferably, described power splitter is ceramic power splitter or microstrip line constant power power splitter.
With existing technology, compare, a kind of circular polarization broad-band antenna that the utility model provides has wide axial ratio bandwidth, circular polarization, and high-gain, miniaturization, stable performance, is easy to the advantages such as volume production.The utility model has not only overcome the narrow bandwidth of single port feed, bulky defect, and simplified the shortcoming of multiport feed system complexity, and improved performance, be more applicable to the application of RFID industry.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the SMA probe feed form of the utility model embodiment.
Fig. 2 is the cross-sectional view of the coaxial line welding feed form of the utility model embodiment.
Fig. 3 is the feeding network structural representation of the utility model embodiment.
Fig. 4 is the structural representation in metal radiation a period of time of the utility model embodiment.
Fig. 5 is the integral body in metal radiation a period of time of the utility model embodiment schematic diagram of arranging.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the technical solution of the utility model is elaborated.
As depicted in figs. 1 and 2, a kind of circular polarization broad-band antenna that the utility model embodiment provides, comprise insulation medium board 13, be positioned at insulation medium board 13 fronts feeding network 11, be positioned at the metal base plate 12 at insulation medium board 13 back sides and be installed on four metal radiation a period of time 15 that insulation medium board 13 is positive and be connected with feeding network 11.
Described insulation medium board 13 is rectangle, is polyfluortetraethylene plate or FR-4 insulation board.
Described feeding network 11 has an input and four outputs, comprise several interconnective power splitter and phase shifters, for the signal from input input being converted into four tunnel constant amplitudes, phase difference, be followed successively by the signal of 90 degree, from four outputs, export to four metal radiation a period of time 15 respectively.
Described metal base plate 12, for covering copper layer, is connected to ground.Metal base plate 12 is at the back side of insulation medium board 13, all to spread copper to form, and is provided with feed pad, can make feeding network 11 be the transmission characteristic of co-planar waveguide, increases signal stabilization.
Particularly, as shown in Figure 3, described feeding network 11 is comprised of the power splitters such as a ceramic power splitter 32, two micro-bands and three micro belt shifting phases, is all printed on the front of insulation medium board 13.The centre of insulation medium board 13 is provided with power feed hole 31, and described power feed hole 31 connects insulation medium board 13 be directly connected with the input (being the input of ceramic power splitter 32) of feeding network 11, is convenient to place feed connection and for feed-in initialize signal.Because ceramic power splitter 32 is four port devices, when using other three ports, the 4th port to be carried out to load matched, in the utility model embodiment, use the resistance 35 of 50 ohm to carry out load matched.
The input of described feeding network 11 can or weld feed by coaxial line by SMA probe feed.As shown in Figure 1, be the feeding classification of SMA probe, the feed end of described SMA probe 14 runs through power feed hole 31 from the back side of insulation medium board 13, is electrically connected to the input of feeding network 11; The earth terminal of SMA probe 14 is electrically connected to metal base plate 12, and is connected to ground.As shown in Figure 2, be the feeding classification of coaxial line welding, the core of described coaxial line 21 runs through power feed hole 31 from the back side of insulation medium board 13, is electrically connected to the input of feeding network 11; The outer copper skin of coaxial line 21 is electrically connected to metal base plate 12, and is connected to ground.
As shown in Figure 3, after initialize signal is divided into two by ceramic power splitter 32, one road signal directly enters the first microstrip power divider 33 and carries out decile, and another road signal carries out after 90 degree phase shifts through the first micro belt shifting phase 39, enters the second microstrip power divider 34 and carries out decile; The output that an output of the first microstrip power divider 33 connects the second micro belt shifting phase 41, the second microstrip power dividers 34 connects the 3rd micro belt shifting phase 43, carries out respectively 90 degree phase shifts.Finally, the output of the second micro belt shifting phase 41 is connected to the first output 44 of feeding network 11 and, another output of the second microstrip power divider 34 is connected to the output of the 3rd output 47 of feeding network 11, the 3rd micro belt shifting phase 43, is connected to the 4th output 46 of feeding network 11, another output of the first microstrip power divider 33 is connected to the second output 45 of feeding network 11; First to fourth output obtains respectively four road power and equates, phase difference is followed successively by the signal of 90 degree, and is symmetrically distributed in four angles on insulation medium board 13, respectively to four metal radiation a period of time 15 feeds, thereby realizes the circular polarization performance of antenna.
On described insulation medium board 13, be also provided with four via holes, metal base plate 12 is connected respectively to the first earth point 48, the second earth point 49, the 3rd earth point 51 and the 4th earth point 50 that is positioned at insulation medium board 13 fronts by four via holes.
As improvement, between two outputs of described the first microstrip power divider 33, be connected with between two outputs of the first isolation resistance 37, the second microstrip power dividers 34 and be connected with the second isolation resistance 36, with this, improve the isolation of each road signal.
Preferably, in the utility model embodiment, described metal radiation a period of time 15 is PIFA(Planar Inverted-F Antenna, planar inverted F-shape antenna) a period of time of form.As shown in Figure 4, a period of time of PIFA form comprises vertical component and horizontal component, the lower end of described vertical component is vertically fixed on insulation medium board 13, the upper end of vertical component is connected with horizontal component, described horizontal component is parallel with insulation medium board 13, the whole shape that forms " F " who lies down.Described metal radiation a period of time 15 is made by PCB, stainless steel, foreign copper-nickel alloy or other metallic conductors.There are 2 pins in each metal radiation a period of time 15, and one of them is feed port 62, is connected, for feed with the first output 44, the second output 45, the 3rd output 47 or the 4th output 46; Another one is grounding ports 63, by the first earth point 48, the second earth point 49, the 3rd earth point 51 or the 4th earth point 50, is connected to metal base plate 12, and then ground connection.The metal radiation oscillator 15 of four PIFA forms, has dwindled a period of time length on the one hand greatly, is beneficial to antenna miniaturization, on the other hand the stability of antenna is improved a lot.
Described four metal radiation a period of time 15 are arranged on the feeding network 11 in insulation medium board 13 fronts in a certain order successively, and it is highly adjustable.
Particularly, in the utility model embodiment, described insulation medium board 13 is rectangles, described four metal radiation a period of time 15 surround clockwise or counterclockwise a square above feeding network 11, its center is insulation medium board 13 center, and each metal radiation a period of time 15 is parallel to respectively a limit of rectangle.
In another embodiment of the present utility model, described insulation medium board 13 can also be circle, and described four metal radiation a period of time 15, centered by insulation medium board 13 center, arrange radially.
A kind of circular polarization broad-band antenna that the utility model provides, its working frequency range can be the hyperfrequency of RFID, can be also the frequency ranges such as 433MHz or 2.4GHz.Can be by regulating micro belt line width length on the length in metal radiation a period of time and feeding network and a period of time apart from the height on floor, come on a large scale or regulate among a small circle the working frequency range of antenna.
With existing technology, compare, a kind of circular polarization broad-band antenna that the utility model provides has wide axial ratio bandwidth, circular polarization, and high-gain, miniaturization, stable performance, is easy to the advantages such as volume production.The utility model has not only overcome the narrow bandwidth of single port feed, bulky defect, and simplified the shortcoming of multiport feed system complexity, and improved performance, be more applicable to the application of RFID industry.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a circular polarization broad-band antenna, it is characterized in that, comprise insulation medium board, be positioned at insulation medium board front feeding network, be positioned at the metal base plate at the insulation medium board back side and be installed on four metal radiation a period of time that insulation medium board is positive and be connected with feeding network;
Described feeding network has an input and four outputs, comprise several interconnective power splitter and phase shifters, for the signal from input input being converted into four tunnel constant amplitudes, phase difference, be followed successively by the signal of 90 degree, from four outputs, export to four metal radiation a period of time respectively;
Described metal base plate, for covering copper layer, is connected to ground;
Described metal radiation a period of time is a period of time of PIFA form.
2. circular polarization broad-band antenna according to claim 1, is characterized in that, the input of described feeding network is by SMA probe feed or weld feed by coaxial line.
3. circular polarization broad-band antenna according to claim 1, is characterized in that, described four metal radiation a period of time surround clockwise or counterclockwise a square, the center that its center is insulation medium board above feeding network.
4. circular polarization broad-band antenna according to claim 1, is characterized in that, described four metal radiation a period of time, centered by the center of insulation medium board, arrange radially.
5. circular polarization broad-band antenna according to claim 1, is characterized in that, described insulation medium board is circle or rectangle.
6. circular polarization broad-band antenna according to claim 1, is characterized in that, described feeding network comprises the first to the 3rd power splitter and the first to the 3rd phase shifter; The input of the 3rd power splitter is the input of feeding network, and an output of the 3rd power splitter is connected with the input of the first power splitter, and another output is connected to the input of the second power splitter through the first phase shifter; An output of the first power splitter is connected to the first output of feeding network through the second phase shifter, another output of the first power splitter is connected to the second output of feeding network; An output of the second power splitter is connected to the 4th output of feeding network through the 3rd phase shifter, another output of the second power splitter is connected to the 3rd output of feeding network.
7. circular polarization broad-band antenna according to claim 1, is characterized in that, described insulation medium board is polyfluortetraethylene plate or FR-4 insulation board.
8. circular polarization broad-band antenna according to claim 1, is characterized in that, described metal radiation a period of time consists of stainless steel, foreign copper-nickel alloy or PCB.
9. circular polarization broad-band antenna according to claim 6, is characterized in that, described phase shifter is the phase shifter of co-planar waveguide or microstrip line form.
10. circular polarization broad-band antenna according to claim 6, is characterized in that, described power splitter is ceramic power splitter or microstrip line constant power power splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320665287.0U CN203536566U (en) | 2013-10-25 | 2013-10-25 | Circularly polarized broadband antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320665287.0U CN203536566U (en) | 2013-10-25 | 2013-10-25 | Circularly polarized broadband antenna |
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| Publication Number | Publication Date |
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| CN203536566U true CN203536566U (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320665287.0U Expired - Lifetime CN203536566U (en) | 2013-10-25 | 2013-10-25 | Circularly polarized broadband antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606743A (en) * | 2013-10-25 | 2014-02-26 | 深圳市摩天射频技术有限公司 | Circularly-polarized wideband antenna |
| CN106450762A (en) * | 2016-10-19 | 2017-02-22 | 厦门致联科技有限公司 | Compact symmetrical feed network |
| CN111146573A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | High-precision navigation antenna designed based on disc excitation cup-shaped antenna |
-
2013
- 2013-10-25 CN CN201320665287.0U patent/CN203536566U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606743A (en) * | 2013-10-25 | 2014-02-26 | 深圳市摩天射频技术有限公司 | Circularly-polarized wideband antenna |
| CN106450762A (en) * | 2016-10-19 | 2017-02-22 | 厦门致联科技有限公司 | Compact symmetrical feed network |
| CN106450762B (en) * | 2016-10-19 | 2023-10-10 | 厦门致联科技有限公司 | Compact symmetrical feed network |
| CN111146573A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | High-precision navigation antenna designed based on disc excitation cup-shaped antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN BOWEI INTELLIGENT IDENTIFICATION TECHNOLO Free format text: FORMER OWNER: SHENZHEN MYANTENNA RF TECHNOLOGY CO., LTD. Effective date: 20150421 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518057 SHENZHEN, GUANGDONG PROVINCE TO: 518000 SHENZHEN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150421 Address after: 518000, 1401c building, C6 building, Hengfeng Industrial Town, Xixiang street, Shenzhen, Guangdong, Baoan District Patentee after: SHENZHEN BROADRADIO RFID TECHNOLOGY CO.,LTD. Address before: 518057 South Guangdong province Shenzhen city Nanshan District high tech Zone South seven road No. 022 on the west side of building fifth unit T2-A-a Patentee before: SHENZHEN MYANTENNA RF TECHNOLOGY CO.,LTD. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
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| CX01 | Expiry of patent term |