CN109546315A - Filter antenna - Google Patents
Filter antenna Download PDFInfo
- Publication number
- CN109546315A CN109546315A CN201811273986.4A CN201811273986A CN109546315A CN 109546315 A CN109546315 A CN 109546315A CN 201811273986 A CN201811273986 A CN 201811273986A CN 109546315 A CN109546315 A CN 109546315A
- Authority
- CN
- China
- Prior art keywords
- filter
- filter unit
- radiating element
- antenna
- medium substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
-
- 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
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- 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
Abstract
The application provides a kind of filter antenna, to assign the function of antenna filtering.The filter antenna includes: medium substrate；Radiating element, feed element and the filter unit being printed on the medium substrate；Wherein, the feed element is electrically connected with the radiating element and the filter unit respectively；The filter unit is to be filtered the signal of input；The feed element is to the signal feed that exports the filter unit to the radiating element；The radiating element is to radiate the signal from the feed element.
Description
Technical field
This application involves electronic technology field more particularly to a kind of filter antennas.
Background technique
Radio frequency identification (Radio Frequency Identification, RFID) technology, also known as radio frequency identification be
It is a kind of to identify specific objective by radio signals and read and write the communication technology of related data.
In current RFID application, filter and antenna are coupled to radio-frequency front-end electricity as two independent subsystem grades
Road.This cascade mode of discrete device may cause filter and antenna port mismatches, to influence the radiation effect of antenna
Rate and directionality, in addition, the cascade in order to realize filter and antenna, needs to set up match circuit between the two, this to penetrate
Frequency front-end circuit complexity is high.
Summary of the invention
The embodiment of the present application provides a kind of filter antenna, to provide a kind of antenna for having filter function.
The application provides a kind of filter antenna, comprising:
Medium substrate；
Radiating element, feed element and the filter unit being printed on the medium substrate；
Wherein, the feed element is electrically connected with the radiating element and the filter unit respectively；
The filter unit is to be filtered the signal of input；
The feed element is to the signal feed that exports the filter unit to the radiating element；
The radiating element is to radiate the signal from the feed element.
Optionally, the filter unit is made of the first microstrip line coupled to each other, the second microstrip line and third microstrip line；
The shape of first microstrip line and second microstrip line is rectangle and is parallel to each other；
The shape of the third microstrip line is U-shaped.
Optionally, the feed element is specially 90 degree of phase phase difference of one-to-two type microstrip power divider.
Optionally, the radiating element, the filter unit and the feed element are printed on the one of the medium substrate
Face；
The another side of the medium substrate is arranged in the ground terminal of the filter antenna.
Optionally, the radiating element is specially the rectangular microband paste for being printed on the medium substrate.
Therefore radiating element, feed element and filter unit are printed on medium substrate by the application, are had to constitute
The filter antenna of filter function.Since the filter antenna has filter function, it is set accessing RFID by the filter antenna
The signal noise of standby (such as RFID reader) is reduced, and reduces the signal processing difficulty of RFID device；That is, can be
The complexity of RFID device radio-frequency front-end is reduced to a certain extent, and entire RFID system performance will not decline, and be conducive in this way
Reduce the research and development difficulty and cost of RFID device radio-frequency front-end.
Detailed description of the invention
Fig. 1 is filter antenna one embodiment structural schematic diagram provided by the present application；
Fig. 2 is the antenna return loss provided by the present application obtained based on emulation experiment and gain schematic diagram；
Fig. 3 is the antenna axial ratio schematic diagram provided by the present application obtained based on emulation experiment.
Specific embodiment
To enable present invention purpose, feature, advantage more obvious and understandable, below in conjunction with the application
Attached drawing in embodiment, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described reality
Applying example is only some embodiments of the present application, and not all embodiments.Based on the embodiment in the application, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
The embodiment of the present application provides a kind of filter antenna, the filter antenna can be applied to RFID device (such as RFID read
Device) or other devices for needing to be arranged antenna in.Referring to Fig. 1, the filter antenna includes:
Medium substrate 11；
Radiating element 12, feed element 13 and the filter unit 14 being printed on medium substrate 11；
Wherein, feed element 13 is electrically connected with 12 radiating elements and filter unit 14 respectively；
Filter unit 14 is to be filtered the signal of input；
Feed element 13 is to the signal feed that exports filter unit 14 to radiating element 12；
Radiating element 12 is to radiate the signal from feed element 13.
Optionally, as shown in Figure 1, filter unit 14 is by the first microstrip line 141 coupled to each other, 142 and of the second microstrip line
Third microstrip line 143 is constituted.The shape of first microstrip line 141 and the second microstrip line 142 is rectangle and is parallel to each other.Third micro-strip
The shape of line 143 is U-shaped.Since the first microstrip line 141, the second microstrip line 142 and third microstrip line 143 are coupled to each other,
Energy transmission can be realized by coupling between them, by selecting mutual distance and position, can be realized to hyperfrequency
The bandpass filtering of signal.
Certainly, in other embodiments, filter unit 14 can also be by other building forms.
Optionally, feed element 13 is specially 90 degree of phase phase difference of one-to-two type microstrip power divider, the one-to-two
The input terminal of type microstrip power divider is connect with filter unit 14, and two outputs of the one-to-two type microstrip power divider
End is connect with radiating element 12.By the one-to-two type microstrip power divider, circular polarisation can be generated for antenna and 90 ° of phases are provided
Difference.
Optionally, radiating element 12, filter unit 14 and feed element 13 are printed on the one side of medium substrate 11.Filter day
The another side of medium substrate 11 is arranged in the ground terminal of line 14.
Optionally, as shown in Figure 1, radiating element 12 is specially the rectangular microband paste for being printed on medium substrate 11, certainly,
In other embodiments, radiating element 12 or other shapes of device are constituted.
Therefore radiating element, feed element and filter unit are printed on medium substrate by the application, are had to constitute
The filter antenna of filter function.Since the filter antenna has filter function, it is set accessing RFID by the filter antenna
The signal noise of standby (such as RFID reader) is reduced, and reduces the signal processing difficulty of RFID device；That is, can be
The complexity of RFID device radio-frequency front-end is reduced to a certain extent, and entire RFID system performance will not decline, and be conducive in this way
Reduce the research and development difficulty and cost of RFID device radio-frequency front-end.
For the performance convenient for preferably embodying the application filter antenna, the embodiment of the present application be based on the application filter antenna into
Emulation experiment is gone.
Fig. 2 show the antenna return loss obtained based on emulation experiment and gain schematic diagram, wherein Fig. 2 abscissa
Freq indicates that frequency, unit are MHz (i.e. megahertz), and Fig. 2 ordinate dB indicates that decibel, dotted line S11 be expression return loss
Curve, solid line Gain is the curve for indicating gain, from Figure 2 it can be seen that the application filter antenna has good band in uhf-range
Outer inhibitory effect, and filter antenna in the absolute value of the return loss of 920MHz and gain close to maximum value.
Fig. 3 show the antenna axial ratio schematic diagram obtained based on emulation experiment, wherein and Fig. 3 abscissa Freq indicates frequency,
Unit is MHz (i.e. megahertz), and Fig. 3 ordinate AR indicates axis ratio (unit is decibel).As seen from Figure 3, the entelechy of filter antenna
Change bandwidth and appears in uhf-range (i.e. range of the AR value no more than 3dB in Fig. 3), and in the axis of 920MHz than minimum, at this time
Circular polarisation effect is optimal.
In conjunction with Fig. 2 and Fig. 3 can be seen that the application filter antenna can uhf-range (such as 900Mhz~
935Mhz) have good Out-of-band rejection effect and circular polarisation effect.
The above are the descriptions to filter antenna provided herein, for those skilled in the art, according to the application
The thought of embodiment, there will be changes in the specific implementation manner and application range, and to sum up, the content of the present specification should not manage
Solution is the limitation to the application.
Claims (5)
1. a kind of filter antenna characterized by comprising
Medium substrate；
Radiating element, feed element and the filter unit being printed on the medium substrate；
Wherein, the feed element is electrically connected with the radiating element and the filter unit respectively；
The filter unit is to be filtered the signal of input；
The feed element is to the signal feed that exports the filter unit to the radiating element；
The radiating element is to radiate the signal from the feed element.
2. filter antenna according to claim 1, which is characterized in that the filter unit is by the first micro-strip coupled to each other
Line, the second microstrip line and third microstrip line are constituted；
The shape of first microstrip line and second microstrip line is rectangle and is parallel to each other；
The shape of the third microstrip line is U-shaped.
3. filter antenna according to claim 1 or 2, which is characterized in that the feed element is specially phase phase difference 90
The one-to-two type microstrip power divider of degree.
4. filter antenna according to claim 1 or 2, which is characterized in that the radiating element, the filter unit and institute
State the one side that feed element is printed on the medium substrate；
The another side of the medium substrate is arranged in the ground terminal of the filter antenna.
5. filter antenna according to claim 1 or 2, which is characterized in that the radiating element is specially printed on described
The rectangular microband paste of medium substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811273986.4A CN109546315A (en) | 2018-10-30 | 2018-10-30 | Filter antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811273986.4A CN109546315A (en) | 2018-10-30 | 2018-10-30 | Filter antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109546315A true CN109546315A (en) | 2019-03-29 |
Family
ID=65845895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811273986.4A Pending CN109546315A (en) | 2018-10-30 | 2018-10-30 | Filter antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109546315A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8391927B2 (en) * | 2006-05-30 | 2013-03-05 | Broadcom Corporation | Multiple mode RF transceiver and antenna structure |
| CN107302131A (en) * | 2017-05-23 | 2017-10-27 | 西安电子科技大学 | A kind of frequency reconfigurable filter antenna applied to UWB/WLAN |
| CN107394369A (en) * | 2017-06-05 | 2017-11-24 | 西安电子科技大学 | Monopole antenna and wireless communication multifunctional system based on restructural feeding network |
| CN207199830U (en) * | 2017-08-11 | 2018-04-06 | 深圳山脊技术有限公司 | A kind of circular polarisation filter antenna |
| CN108232434A (en) * | 2017-12-15 | 2018-06-29 | 华南理工大学 | A kind of low section omnidirectional radiation filters dipole antenna |
| CN108493589A (en) * | 2018-05-17 | 2018-09-04 | 华南理工大学 | A kind of filter antenna for wearable device |
-
2018
- 2018-10-30 CN CN201811273986.4A patent/CN109546315A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8391927B2 (en) * | 2006-05-30 | 2013-03-05 | Broadcom Corporation | Multiple mode RF transceiver and antenna structure |
| CN107302131A (en) * | 2017-05-23 | 2017-10-27 | 西安电子科技大学 | A kind of frequency reconfigurable filter antenna applied to UWB/WLAN |
| CN107394369A (en) * | 2017-06-05 | 2017-11-24 | 西安电子科技大学 | Monopole antenna and wireless communication multifunctional system based on restructural feeding network |
| CN207199830U (en) * | 2017-08-11 | 2018-04-06 | 深圳山脊技术有限公司 | A kind of circular polarisation filter antenna |
| CN108232434A (en) * | 2017-12-15 | 2018-06-29 | 华南理工大学 | A kind of low section omnidirectional radiation filters dipole antenna |
| CN108493589A (en) * | 2018-05-17 | 2018-09-04 | 华南理工大学 | A kind of filter antenna for wearable device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190329 |