CN105140645A - Harmonic suppressing antenna - Google Patents
Harmonic suppressing antenna Download PDFInfo
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- CN105140645A CN105140645A CN201510530628.7A CN201510530628A CN105140645A CN 105140645 A CN105140645 A CN 105140645A CN 201510530628 A CN201510530628 A CN 201510530628A CN 105140645 A CN105140645 A CN 105140645A
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Abstract
The invention provides a harmonic suppressing antenna. The harmonic suppressing antenna comprises an antenna and a filter; the antenna and the filter are connected through a metal probe; the filter feeds through a coaxial line; the antenna comprises an antenna patch and an antenna dielectric plate; the filter comprises a filter dielectric plate and a filter patch; a metal floor is arranged between the antenna dielectric plate and the filter dielectric plate; the filter patch comprises a phase-step impedance resonant unit, input and output microstrip lines at the two ends of the phase-step impedance resonant unit, and an open-circuit branch section in the middle of the phase-step impedance resonant unit; and each short-circuit branch section is provided with a grounded probe. The harmonic suppressing antenna, by introducing the phase-step impedance resonant unit, the open-circuit branch section and the short-circuit branch section, realizes the ultra-wide upper stop-band band-pass filter; the output end of the filter is connected with a conventional microstrip antenna, and the antenna with harmonic suppression of 10 times or more is obtained; compared with the conventional microstrip antenna, the harmonic gain of the harmonic suppressing antenna is reduced by more than 10 dB; and meanwhile, the gain, the axial ratio and other performances in the center frequency position of the harmonic suppressing antenna are not changed.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of harmonics restraint antenna with more than 10 times harmonic inhibition capabilities.
Background technology
Antenna is device indispensable in modern microwave communication system.Because antenna front ends is often containing the nonlinear device such as amplifier, frequency mixer, thus a large amount of harmonic components can be produced.If antenna does not possess the function of harmonics restraint, then harmonic energy can be gone out by antenna transmission, can cause serious electromagnetic interference; Or harmonic energy enters system by reception antenna, cause system performance degradation.
Along with the development of modern electronic technology, existing researcher proposes some solutions for the problems referred to above.Two classes are divided into: first design has the filter filtering harmonic energy cascade antenna again of stopband in ultra-wide from method; It two is by filter and antenna structurally Combined design, makes structure while emittance, play the effect of filtering harmonic energy.The advantage of first method is that antenna and filter can independent design, but the introducing of filter is often along with larger insertion loss, and the gain of antenna is declined.Meanwhile, the input impedance due to antenna is frequency response function, after antenna cascading filter, the performance of filter can be made to have a greatly reduced quality, thus become the major technical challenge of the method, and therefore the design of the method there is not yet open source literature report; Second method filter and antenna is structurally merged to carry out design and make irradiation structure have filtering performance simultaneously, and its benefit is mutually with being expected to reduce systemic Insertion Loss by structure.But the method also exists obvious difficulty, the method can not realize any harmonics restraint repeatedly on the one hand, and on the other hand, the irradiation structure strobed in the method often can produce larger cross polarization radiations simultaneously, thus affects radiation efficiency.Up to the present, the method has best result design in appearing in the newspapers is published in article in 2014: in " AModifiedCPW-FedSlotDipoleAntennaWithWidebandHarmonicSup pression ", and its harmonic inhibition capability can reach the suppression of 2 to 9 subharmonic 10dB.But its main polarization radiation efficiency obviously declines, relative to slot dipole antenna, efficiency have decreased to 77% from 86%.
Summary of the invention
The object of the invention is to overcome shortcoming and defect of the prior art, propose that a kind of structure is simple, feed is convenient, make easily, can reach the harmonic inhibition capability of more than 10 times more than the antenna of 10dB.
Technical solution of the present invention is as follows:
A kind of harmonics restraint antenna, comprise antenna, filter, described antenna is connected by metal probe with filter, and described filter passes through coaxial feeding; Described antenna comprises the antenna medium plate below antenna patch, antenna patch, described filter comprises the filter paster below filter medium plate, filter medium plate, be metal floor between described antenna medium plate and filter medium plate, described filter paster comprises a Stepped Impedance resonant element, the input and output microstrip line at Stepped Impedance resonant element two ends and short branch, be positioned at Stepped Impedance resonant element in the middle of open circuit detail, each short branch is respectively provided with a grounded probe.
As optimal way, the input microstrip line of filter is provided with 4 open circuit details.
As optimal way, the width W 0=3.12mm of input microstrip line, the width W 1=1mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR width W 2=4.8mm of Stepped Impedance resonant element, the high impedance width W 3=0.3mm of Stepped Impedance resonant element, the width of the open circuit detail in the middle of Stepped Impedance resonant element is respectively W4=5mm, W5=0.3mm, the length L1=14mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR length L2=14mm of Stepped Impedance resonant element, the high impedance length L3=18.2mm of Stepped Impedance resonant element, the length L4=10.5mm respectively of the open circuit detail in the middle of Stepped Impedance resonant element, L5=10mm, the length of 4 open circuit details on input microstrip line is respectively L6=8mm, L7=5.5mm, L8=3.8mm, L9=2.7mm.
As optimal way, described antenna is by realizing left-hand circular polarization at described antenna patch one clipped corner or stickup one square.
As optimal way, the length of side of described antenna patch is the half-wavelength at center of antenna frequency place.
As optimal way, the size ag=bg=75mm of described metal floor, the size a=b=40mm of antenna medium plate, antenna patch size ap=bp=28.25mm, antenna patch excision or the block sizes aq=bq=3.3mm pasted.
As optimal way, described metal probe distance antenna patch edge is respectively d1=5.0mm, d2=14.1mm.
Stepped Impedance resonant element (SIR) is primary resonance structure, and its low-impedance line two ends microstrip line forms input and output, introduces some short branch at the low-impedance line of SIR, introduces the open circuit detail with stepped impedance characteristic at the high impedance line of SIR; First energy to be fed filter by 50 ohm coaxial lines, in the ultra-wide of filter, the energy of 2 to 10 subharmonic all filters out by stopband, and only allow first-harmonic energy to pass through, secondly by metal probe, the energy of filter output is fed antenna, so just only have first-harmonic energy to be gone out by antenna transmission, antenna received energy is as the same.
Beneficial effect of the present invention is: realize stopband band pass filter in ultra-wide by introducing Stepped Impedance resonant element (SIR) and open circuit, short branch, and then at filter output termination conventional microstrip antenna, the antenna of 10 even more limitation of high harmonics must be reached, compare conventional microstrip antenna, harmonics more than decline 10dB, the performance entirety such as gain, axial ratio at centre frequency place is constant simultaneously.
Accompanying drawing explanation
Fig. 1 (a) is vertical view of the present invention;
Fig. 1 (b) is end view of the present invention;
Fig. 1 (c) is upward view of the present invention;
Fig. 2 is the reflection coefficient simulation comparison figure of the embodiment of the present invention and conventional microstrip antenna;
Fig. 3 is the gain simulation comparison figure of the embodiment of the present invention and conventional microstrip antenna;
Fig. 4 is embodiment of the present invention axial ratio emulation schematic diagram;
Fig. 5 is embodiment of the present invention radiation efficiency emulation schematic diagram;
Fig. 6 is embodiment of the present invention polarized gain Direction Pattern Simulation schematic diagram.
1 be metal floor, 2 be antenna medium plate, 3 be antenna patch, 4 be metal probe, 5 be filter medium plate, 6 for filter paster, 7 be grounded probe, and 61 be Stepped Impedance resonant element, and 62 be short branch, and 63 is detail of opening a way, and 8 is input microstrip line.
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
A kind of harmonics restraint antenna, comprise antenna, filter, described antenna is connected by metal probe 4 with filter, and described filter passes through coaxial feeding; Described antenna comprises the antenna medium plate 2 below antenna patch 3, antenna patch, described filter comprises the filter paster 6 below filter medium plate 5, filter medium plate 5, be metal floor 1 between described antenna medium plate 2 and filter medium plate 5, described filter paster 6 comprises a Stepped Impedance resonant element 61, the input and output microstrip line at Stepped Impedance resonant element 61 two ends and short branch 62, be positioned at Stepped Impedance resonant element 61 in the middle of open circuit detail 63, each short branch is respectively provided with a grounded probe 7.
The input microstrip line 8 of filter is provided with 4 open circuit details 63.
Concrete, in the present embodiment, the width W 0=3.12mm of input microstrip line, the width W 1=1mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR width W 2=4.8mm of Stepped Impedance resonant element, the high impedance width W 3=0.3mm of Stepped Impedance resonant element, the width of the open circuit detail in the middle of Stepped Impedance resonant element is respectively W4=5mm, W5=0.3mm, the length L1=14mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR length L2=14mm of Stepped Impedance resonant element, the high impedance length L3=18.2mm of Stepped Impedance resonant element, the length of the open circuit detail in the middle of Stepped Impedance resonant element is respectively L4=10.5mm, L5=10mm, these two open circuit details can exchange up and down, do not affect performance.
The length of 4 open circuit details on input microstrip line 8 is respectively L6=8mm, L7=5.5mm, L8=3.8mm, L9=2.7mm.The order of 4 open circuit details can arbitrary arrangement, does not affect performance.
The size ag=bg=75mm of described metal floor, the size a=b=40mm of antenna medium plate, antenna patch size ap=bp=28.25mm, antenna patch excision or the block sizes aq=bq=3.3mm pasted.
Described metal probe 4 is respectively d1=5.0mm apart from antenna patch edge, d2=14.1mm.
Described antenna is by realizing left-hand circular polarization at described antenna patch one clipped corner or stickup one square.The length of side of described antenna patch is the half-wavelength at center of antenna frequency place.
Stepped Impedance resonant element (SIR) is primary resonance structure, and its low-impedance line two ends microstrip line forms input and output, introduces some short branch at the low-impedance line of SIR, introduces the open circuit detail with stepped impedance characteristic at the high impedance line of SIR; First energy to be fed filter by 50 ohm coaxial lines, in the ultra-wide of filter, the energy of 2 to 10 subharmonic all filters out by stopband, and only allow first-harmonic energy to pass through, secondly by metal probe, the energy of filter output is fed antenna, so just only have first-harmonic energy to be gone out by antenna transmission, antenna received energy is as the same.
The present invention realizes stopband band pass filter in ultra-wide by introducing Stepped Impedance resonant element (SIR) and open circuit, short branch, and then at filter output termination conventional microstrip antenna, the antenna of 10 even more limitation of high harmonics must be reached, compare conventional microstrip antenna, harmonics more than decline 10dB, the performance entirety such as gain, axial ratio at centre frequency place is constant simultaneously.
The harmonics restraint antenna of the present embodiment contrasts as shown in Figure 2 with the reflection coefficient of the conventional microstrip antenna with identical index and size, the a lot of frequency places of conventional microstrip antenna outside centre frequency have energy to enter antenna, the energy that some frequency enters is also larger, and the reflection coefficient of the present embodiment is at the close-28dB in centre frequency place, coupling is good, and outer until the reflection coefficient of 10 subharmonic is all close to 0dB in centre frequency, energy is completely reflected substantially.
The harmonics restraint antenna of the present embodiment and the normal direction gain contrast of conventional microstrip antenna are as shown in Figure 3, gain outside conventional microstrip aerial band is not well suppressed, even also large than centre frequency place in the gain of some frequency, and harmonics restraint antenna well solves this problem, the gain of centre frequency place remains unchanged substantially, but harmonics more than decline 10dB.
As shown in Figure 4, at centre frequency place, axial ratio is less than 1dB to the axial ratio of the harmonics restraint antenna of the present embodiment, and circular polarization is functional.
As shown in Figure 5, at centre frequency place, radiation efficiency is about 82% to the radiation efficiency of the harmonics restraint antenna of the present embodiment, and the radiance of antenna is good.
As shown in Figure 6, the large 25dB of left-hand circular polarization ratio of gains dextrorotation in centre frequency place normal orientation, left-hand circular polarization is functional for the polarized gain directional diagram of the harmonics restraint antenna of the present embodiment.
As can be seen from simulation result, embodiment antenna is by connecing the wideband suppression having the filter of stopband in ultra-wide and achieve single feedback left-hand circular polarization performance and reach 10 subharmonic at conventional microstrip antenna front ends.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (7)
1. a harmonics restraint antenna, is characterized in that: comprise antenna, filter, and described antenna is connected by metal probe with filter, and described filter passes through coaxial feeding; Described antenna comprises the antenna medium plate below antenna patch, antenna patch, described filter comprises the filter paster below filter medium plate, filter medium plate, be metal floor between described antenna medium plate and filter medium plate, described filter paster comprises a Stepped Impedance resonant element, the input and output microstrip line at Stepped Impedance resonant element two ends and short branch, be positioned at Stepped Impedance resonant element in the middle of open circuit detail, each short branch is respectively provided with a grounded probe.
2. harmonics restraint antenna according to claim 1, is characterized in that: the input microstrip line of filter is provided with 4 open circuit details.
3. harmonics restraint antenna according to claim 2, it is characterized in that: the width W 0=3.12mm of input microstrip line, the width W 1=1mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR width W 2=4.8mm of Stepped Impedance resonant element, the high impedance width W 3=0.3mm of Stepped Impedance resonant element, the width of the open circuit detail in the middle of Stepped Impedance resonant element is respectively W4=5mm, W5=0.3mm, the length L1=14mm of the short branch at Stepped Impedance resonant element two ends, the Low ESR length L2=14mm of Stepped Impedance resonant element, the high impedance length L3=18.2mm of Stepped Impedance resonant element, the length L4=10.5mm respectively of the open circuit detail in the middle of Stepped Impedance resonant element, L5=10mm, the length of 4 open circuit details on input microstrip line is respectively L6=8mm, L7=5.5mm, L8=3.8mm, L9=2.7mm.
4. the harmonics restraint antenna according to claim 1 or 2 or 3, is characterized in that: described antenna is by realizing left-hand circular polarization at described antenna patch one clipped corner or stickup one square.
5. harmonics restraint antenna according to claim 1, is characterized in that: the length of side of described antenna patch is the half-wavelength at center of antenna frequency place.
6. harmonics restraint antenna according to claim 4, it is characterized in that: the size ag=bg=75mm of described metal floor, the size a=b=40mm of antenna medium plate, antenna patch size ap=bp=28.25mm, antenna patch excision or the block sizes aq=bq=3.3mm pasted.
7. harmonics restraint antenna according to claim 1, is characterized in that: described metal probe distance antenna patch edge is respectively d1=5.0mm, d2=14.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510530628.7A CN105140645A (en) | 2015-08-26 | 2015-08-26 | Harmonic suppressing antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510530628.7A CN105140645A (en) | 2015-08-26 | 2015-08-26 | Harmonic suppressing antenna |
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| Publication Number | Publication Date |
|---|---|
| CN105140645A true CN105140645A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510530628.7A Pending CN105140645A (en) | 2015-08-26 | 2015-08-26 | Harmonic suppressing antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252872A (en) * | 2016-09-28 | 2016-12-21 | 华南理工大学 | Same polarization micro-strip duplexed antenna array |
| CN109449612A (en) * | 2018-11-16 | 2019-03-08 | 东莞理工学院 | A kind of integrated commutation antenna with harmonics restraint |
| CN111384992A (en) * | 2020-02-19 | 2020-07-07 | 深圳市大富科技股份有限公司 | Connection device, transceiver, base station and communication method of connection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5764189A (en) * | 1995-09-27 | 1998-06-09 | Siemens Aktiengesellschaft | Doppler radar module |
| CN202268482U (en) * | 2011-10-27 | 2012-06-06 | 哈尔滨工程大学 | Ultrahigh frequency radio frequency identification reader-writer antenna for electronic toll collection system |
-
2015
- 2015-08-26 CN CN201510530628.7A patent/CN105140645A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5764189A (en) * | 1995-09-27 | 1998-06-09 | Siemens Aktiengesellschaft | Doppler radar module |
| CN202268482U (en) * | 2011-10-27 | 2012-06-06 | 哈尔滨工程大学 | Ultrahigh frequency radio frequency identification reader-writer antenna for electronic toll collection system |
Non-Patent Citations (2)
| Title |
|---|
| F. LI 等: ""Broadband bandpass filter with wide upper stopband using stub-loaded multiple-mode resonators"", 《ELECTRONICS LETTERS》 * |
| RAKESH KUMAR YADAV 等: ""Performances Analysis of a 5 GHz Rectenna for Indoor Applications"", 《2013 INTERNATIONAL CONFERENCE ON MICROWAVE AND PHOTONICS (ICMAP)》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252872A (en) * | 2016-09-28 | 2016-12-21 | 华南理工大学 | Same polarization micro-strip duplexed antenna array |
| CN109449612A (en) * | 2018-11-16 | 2019-03-08 | 东莞理工学院 | A kind of integrated commutation antenna with harmonics restraint |
| CN109449612B (en) * | 2018-11-16 | 2024-01-05 | 东莞理工学院 | Integrated rectifying antenna with harmonic suppression |
| CN111384992A (en) * | 2020-02-19 | 2020-07-07 | 深圳市大富科技股份有限公司 | Connection device, transceiver, base station and communication method of connection device |
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