CN105449379B - A kind of filter antenna that can suppress high-frequency harmonic - Google Patents
A kind of filter antenna that can suppress high-frequency harmonic Download PDFInfo
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- CN105449379B CN105449379B CN201510860875.3A CN201510860875A CN105449379B CN 105449379 B CN105449379 B CN 105449379B CN 201510860875 A CN201510860875 A CN 201510860875A CN 105449379 B CN105449379 B CN 105449379B
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- dielectric
- slab
- antenna
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- filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses a kind of filter antenna that can suppress high-frequency harmonic, including dielectric-slab, step electric impedance resonator, stepped impedance symmetrical dipole, low-pass filter and feed element, step electric impedance resonator and stepped impedance symmetrical dipole are arranged at the top layer of dielectric-slab, step electric impedance resonator forms antenna element together close to stepped impedance symmetrical dipole；The upper conductor of low-pass filter is arranged on the top layer of dielectric-slab, and connects with the left arm of stepped impedance symmetrical dipole, and lower conductor is arranged on the bottom of dielectric-slab, and is connected by a via with the right arm of stepped impedance symmetrical dipole；The upper conductor of the feed element is arranged on the top layer of dielectric-slab, and connect with the upper conductor of low-pass filter, lower conductor is arranged on the bottom of dielectric-slab, and connects with the lower conductor of low-pass filter, and the projection of the upper conductor of feed element on dielectric-slab bottom is located at lower conductor center.The present invention not only has the characteristics that high rectangle degree, but also can effectively inhibit unwanted harmonics.
Description
Technical field
The present invention relates to a kind of filter antenna, especially a kind of filter antenna that can suppress high-frequency harmonic, belongs to wireless shifting
The dynamic communications field.
Background technology
With the fast development of wireless communication technique, frequency microwave requirement on devices is dimensionally more compact, various multi-functional
The development of device is proved to be the good method for solving the problems, such as this, and traditional wave filter and antenna are two independent devices,
It is individually designed in wireless communication system, filter antenna is the integrated of antenna and wave filter and has the function of two kinds of devices.
There are many researchs on filter antenna recent years, document [1] proposes a kind of wave filter and antenna synthesis is set
The method of meter；The comprehensive filter antenna out in document [2]-[4] has good frequency selectivity；Document [5] is short by introducing
Pass by hole；Document [6] allows antenna to have more preferable rectangular degree by adding a parasitic element.
For above-mentioned filter antenna although with good filtering selectivity, they can not suppress higher hamonic wave, higher hamonic wave
Radiation can cause extra power attenuation, and produce signal interference.
Bibliography：
[1]C.T.Chuang and S.J.Chung,“Synthesis and design of a new printed
filtering antenna,”IEEE Trans.Antennas Propag.,vol.59,no.3,pp.1036-1042,
Mar.2011.
[2]W.-J.Wu,Y.-Z.Yin,S.-L.Zuo,Z.-Y.Zhang,and J.-J.Xie,“A new compact
filter-antenna for modern wireless communication systems,”IEEE Antennas
Wireless Propag.Lett..,vol.10,pp.1131-1134,2011.
[3]C.-T.Chuang and S.-J.Chung“Acompact printed filtering antenna
using a ground-intruded coupled line resonator”,IEEE Trans.Antennas Propag.,
vol.59,no.10,pp.3630-3637,Oct.2011.
[4]C.-K.Lin and S.-J.Chung“Acompact filtering microstrip antenna with
quasi-elliptic broadside antenna gain response”,IEEE Antennas Wireless
Propag.Lett.,vol.10,pp.381-384,2011.
[5]S.W.Wong,T.G.Huang,C.X.Mao,Z.N.Chen,and Q.X.Chu“Planar filtering
ultra-wideband(UWB)antenna with shorting pins”,IEEE Trans.Antennas Propag.,
vol.61,no.2,pp.948-953,Feb.2013.
[6]J.Wu,Z.Zhao,Z.Nie,and Q.Liu,“Aprinted unidirectional antenna with
improved upper band-edge selectivity using a parasitic loop”,IEEE
Trans.Antennas Propag.,vol.63,no.4,pp.1832-1873,Apr.2015。
The content of the invention
The purpose of the present invention is to solve the defects of the above-mentioned prior art, there is provided a kind of filter that can suppress high-frequency harmonic
Wave antenna, which not only has the characteristics that high rectangle degree, but also can effectively inhibit unwanted harmonics.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of filter antenna that can suppress high-frequency harmonic, including dielectric-slab, step electric impedance resonator, stepped impedance symmetrically shake
Son, low-pass filter and feed element, step electric impedance resonator and the stepped impedance symmetrical dipole are arranged at dielectric-slab
Top layer, step electric impedance resonator forms antenna element together close to stepped impedance symmetrical dipole；
The upper conductor of the low-pass filter is arranged on the top layer of dielectric-slab, and with the left arm phase of stepped impedance symmetrical dipole
Connect, the lower conductor of low-pass filter is arranged on the bottom of dielectric-slab, and passes through the right side of a via and stepped impedance symmetrical dipole
Arm connects；
The upper conductor of the feed element is arranged on the top layer of dielectric-slab, and connects with the upper conductor of low-pass filter, feedback
The lower conductor of electric unit is arranged on the bottom of dielectric-slab, and connects with the lower conductor of low-pass filter, the upper conductor of feed element
Projection on dielectric-slab bottom is at the lower conductor center of feed element.
As a preferred embodiment, the upper conductor of the low-pass filter includes connected the first banding microstrip line and first
Triangular structure of right angle, the lower conductor of the low-pass filter include connected the second banding microstrip line and the second right angled triangle
Structure, first triangular structure of right angle connect with the left arm of stepped impedance symmetrical dipole, the second right angled triangle knot
Structure is connected by a via with the right arm of stepped impedance symmetrical dipole, the first banding microstrip line and the second banding microstrip line
It is parallel to each other.
As a preferred embodiment, one end of the upper conductor of the feed element connects with the upper conductor of low-pass filter,
The other end is located at the lower edge of dielectric-slab top layer, and connects with coaxial line；One end of the lower conductor of the feed element with it is low
The lower conductor of bandpass filter connects, and the other end is located at the lower edge of dielectric-slab bottom.
As a preferred embodiment, the coaxial line is 50 ohm of coaxial line.
As a preferred embodiment, the upper conductor of the feed element is rectangular microstrip line.
As a preferred embodiment, the lower conductor of the feed element is gradual change microstrip line.
As a preferred embodiment, the gradual change microstrip line is the microstrip line of the oval gradual change of the right and left.
As a preferred embodiment, the concave shape of the step electric impedance resonator.
As a preferred embodiment, the dielectric-slab uses thickness as 0.8mm, and dielectric constant is 2.55 pcb board.
As a preferred embodiment, the gross area of the antenna element and low-pass filter is 34mm × 33mm.
The present invention has following beneficial effect relative to the prior art：
1st, in filter antenna of the invention, step electric impedance resonator and stepped impedance symmetrical dipole are arranged on the top of dielectric-slab
Layer, and antenna element is formed, stepped impedance symmetrical dipole can be reduced as main radiating element by higher hamonic wave toward high frequency displacement
Influence of the higher hamonic wave to radiation, and step electric impedance resonator rank is close to stepped impedance symmetrical dipole, is a parasitic ladder
Electric impedance resonator, can increase a radiation zero in high frequency stopband, improve the selectivity of antenna；In addition, low-pass filter can
With further harmonic carcellation, the high frequency stopband of antenna element is set to be further improved.
2nd, filter antenna of the invention pass through test result indicates that, have 25% fractional bandwidth, in 2.5GHz to 3.3GHz
Frequency range in return loss be less than -10dB, and there is no the spoke of harmonic wave in the frequency range of 4.0GHz to 14.0GHz
Penetrate；Meanwhile the radiation gain in passband is about 2.5dBi, the maximum gain than high frequency stopband is higher by 10.3dBi.
3rd, filter antenna of the invention has the advantages that compact structure, Wide stop bands and feed are simple, can be in channel radio
There is a series of application in letter.
Brief description of the drawings
Fig. 1 is the filter antenna dimensional structure diagram of the present invention.
Fig. 2 is the filter antenna planar structure schematic diagram of the present invention.
Fig. 3 is the physical quantity sign picture of various pieces in structure shown in Fig. 2.
Fig. 4 is the return loss of the filter antenna of the present invention | S11 | emulation and test result curve map.
Fig. 5 is gain emulation and the test result curve map of the filter antenna of the present invention.
Fig. 6 is the antenna pattern in filter antenna H faces when frequency is 2.9GHz of the present invention.
Fig. 7 is the antenna pattern in filter antenna E faces when frequency is 2.9GHz of the present invention.
Wherein, 1- dielectric-slabs, 2- step electric impedance resonators, 3- stepped impedance symmetrical dipoles, 4- low-pass filters, 5- feeds
Unit, 6- the first banding microstrip lines, the first triangular structure of right angle of 7-, 8- the second banding microstrip lines, the second right angled triangles of 9-
Structure, 10- vias, 11- rectangular microstrip lines, 12- gradual change microstrip lines.
Embodiment
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment 1：
As depicted in figs. 1 and 2, the filter antenna of the present embodiment includes dielectric-slab 1, step electric impedance resonator 2, stepped impedance
Symmetrical dipole 3, low-pass filter 4 and feed element 5；
The dielectric-slab 1 uses the pcb board that thickness is 2.55 for 0.8mm, dielectric constant；
The step electric impedance resonator 2 and stepped impedance symmetrical dipole 3 are arranged at the top layer of dielectric-slab 1, stepped impedance
Resonator 2 forms antenna element together close to stepped impedance symmetrical dipole 3；Wherein, 3 conduct of stepped impedance symmetrical dipole
Main radiating element, can reduce influence of the higher hamonic wave to radiation by higher hamonic wave toward high frequency displacement；The step electric impedance resonator
2 concave shapes, are a parasitic step electric impedance resonators, can increase a radiation zero in high frequency stopband, improve antenna
Selectivity；
The upper conductor of the low-pass filter 4 is arranged on the top layer of dielectric-slab 1, and lower conductor is arranged on the bottom of dielectric-slab 1；
Wherein, the upper conductor includes connected the first banding microstrip line 6 and the first triangular structure of right angle 7, the first right angled triangle
Structure 7 connects with the left arm of stepped impedance symmetrical dipole 3；The lower conductor includes the second connected banding microstrip line 8 and second
Triangular structure of right angle 9, the right side that second triangular structure of right angle 9 passes through a via 10 and stepped impedance symmetrical dipole 3
Arm connects, and the first banding microstrip line 6 is parallel to each other with the second banding microstrip line 8；The low-pass filter 4 can further disappear
Except harmonic wave, the high frequency stopband of antenna element is set to be further improved；
The gross area of the antenna element and low-pass filter 4 is 34mm × 33mm, and quarter-wave is carried with traditional
The size of the half-wave doublet of long feeder line is suitable；
The upper conductor of the feed element 5 is rectangular microstrip line 11, it is arranged on the top layer of dielectric-slab 1, one end and low pass
The upper conductor of wave filter 4 connects, and the other end is located at the lower edge of 1 top layer of dielectric-slab, and connects with 50 ohm of coaxial line；Institute
The lower conductor for stating feed element 5 is gradual change microstrip line 12, which is the micro-strip of the oval gradual change of the right and left
Line, it is arranged on the bottom of dielectric-slab 1, and one end connects with the lower conductor of low-pass filter 4, and the other end is located at 1 bottom of dielectric-slab
Lower edge；Projection of the rectangular microstrip line 11 on 1 bottom of dielectric-slab is at the center of gradual change microstrip line 12.
The physical quantity of various pieces is as shown in figure 3, specific physical dimension such as table 1 below institute in the filter antenna of the present embodiment
Show.
| L1 | L2 | L3 | L4 | Ld1 | Ld2 | Lp1 |
| 2.5mm | 3mm | 6.5mm | 2mm | 8mm | 8mm | 6.5mm |
| Lp2 | Lo | Lf | W1 | W2 | W3 | W4 |
| 6.5mm | 1.63mm | 21mm | 0.4mm | 5mm | 0.6mm | 6.5mm |
| Wd1 | Wd2 | Wp1 | Wp2 | Wf | Wg | S |
| 0.75mm | 6mm | 0.5mm | 3.5mm | 2.2mm | 20mm | 0.4mm |
The physical dimension of 1 filter antenna of table
The return loss of the filter antenna of the present embodiment | S11 | emulation is with test result as shown in figure 4, can from figure
Arrive, emulation coincide with test result, and the filter antenna of the present embodiment has 25% fractional bandwidth, in the frequency of 2.5GHz to 3.3GHz
In the range of rate | S11 |<-10dB；Emulation and experimental result all show do not have harmonic wave in the frequency range of 4.0GHz to 14.0GHz
Radiation.
Gain emulation and the test result of the Y-axis positive direction of the filter antenna of the present embodiment are as shown in figure 5, can be with from figure
See, the radiation gain in passband is about 2.5dBi, and the maximum gain than high frequency stopband is higher by 10.3dBi；Go out in 4.5GHz
Substantially there is a radiation zero, this explanation is by introducing parasitic step electric impedance resonator, the rectangle of the upper side band of filter antenna
Degree is improved well.
The filter antenna of the present embodiment radiation direction of H faces (YoZ faces) and E faces (XoZ planes) when frequency is 2.9GHz
Respectively as shown in Figure 6 and Figure 7, main polarization parallel with X-direction, cross polarization is parallel with Y direction for figure；Can from Fig. 6
Arrive, directional diagram of the antenna in H faces is omnidirectional, and as can see from Figure 7, the directional diagram in E faces is a figure of eight, and total
Antenna pattern it is similar to traditional doublet antenna.
In conclusion in the filter antenna of the present invention, the radiation zero that parasitic step electric impedance resonator produces can carry
The selectivity of high antenna, test result indicates that the upper stopband of filter antenna is extended to 14GHz, realizes 27.5% impedance band
Width, with the high 10.3dBi of interior radiation gain resistivity band maximum gain；Experimental result also demonstrates that filter antenna has good characteristic, than
Such as available radiating bands are wider, and Wide stop bands suppress；The advantages of compact structure, simple Wide stop bands and feed, the filtering can be made
Antenna has a series of application in wireless communications.
The above, is only patent preferred embodiment of the present invention, but the protection domain of patent of the present invention is not limited to
This, any one skilled in the art is in the scope disclosed in patent of the present invention, the skill of patent according to the present invention
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.
Claims (10)
1. a kind of filter antenna that can suppress high-frequency harmonic, including dielectric-slab, it is characterised in that：Further include stepped impedance resonance
Device, stepped impedance symmetrical dipole, low-pass filter and feed element, the step electric impedance resonator and stepped impedance symmetrically shake
Son is arranged at the top layer of dielectric-slab, and step electric impedance resonator forms antenna element together close to stepped impedance symmetrical dipole；
The upper conductor of the low-pass filter is arranged on the top layer of dielectric-slab, and connects with the left arm of stepped impedance symmetrical dipole,
The lower conductor of low-pass filter is arranged on the bottom of dielectric-slab, and passes through the right arm phase of a via and stepped impedance symmetrical dipole
Connect；
The upper conductor of the feed element is arranged on the top layer of dielectric-slab, and connects with the upper conductor of low-pass filter, and feed is single
The lower conductor of member is arranged on the bottom of dielectric-slab, and connects with the lower conductor of low-pass filter, and the upper conductor of feed element is being situated between
Projection on scutum bottom is at the lower conductor center of feed element.
A kind of 2. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The low-pass filtering
The upper conductor of device includes connected the first banding microstrip line and the first triangular structure of right angle, the lower conductor of the low-pass filter
Including connected the second banding microstrip line and the second triangular structure of right angle, first triangular structure of right angle and stepped impedance
The left arm of symmetrical dipole connects, and second triangular structure of right angle passes through a via and the right arm of stepped impedance symmetrical dipole
Connect, the first banding microstrip line is parallel to each other with the second banding microstrip line.
A kind of 3. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The feed element
One end of upper conductor connect with the upper conductor of low-pass filter, the other end is located at the lower edge of dielectric-slab top layer, and with it is same
Axis connects；One end of the lower conductor of the feed element connects with the lower conductor of low-pass filter, and the other end is located at dielectric-slab
The lower edge of bottom.
A kind of 4. filter antenna that can suppress high-frequency harmonic according to claim 3, it is characterised in that：The coaxial line is
50 ohm of coaxial line.
A kind of 5. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The feed element
Upper conductor be rectangular microstrip line.
A kind of 6. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The feed element
Lower conductor be gradual change microstrip line.
A kind of 7. filter antenna that can suppress high-frequency harmonic according to claim 6, it is characterised in that：The gradual change micro-strip
Line is the microstrip line of the oval gradual change of the right and left.
A kind of 8. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The stepped impedance
The concave shape of resonator.
A kind of 9. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The dielectric-slab is adopted
It is 0.8mm with thickness, dielectric constant is 2.55 pcb board.
A kind of 10. filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterised in that：The antenna list
The gross area of member and low-pass filter is 34mm × 33mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510860875.3A CN105449379B (en) | 2015-11-30 | 2015-11-30 | A kind of filter antenna that can suppress high-frequency harmonic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510860875.3A CN105449379B (en) | 2015-11-30 | 2015-11-30 | A kind of filter antenna that can suppress high-frequency harmonic |
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| Publication Number | Publication Date |
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| CN105449379A CN105449379A (en) | 2016-03-30 |
| CN105449379B true CN105449379B (en) | 2018-04-13 |
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| CN201510860875.3A Expired - Fee Related CN105449379B (en) | 2015-11-30 | 2015-11-30 | A kind of filter antenna that can suppress high-frequency harmonic |
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| CN105846071B (en) * | 2016-04-19 | 2019-02-01 | 重庆大学 | A kind of small third-order filter antenna of electricity with good Out-of-band rejection characteristic |
| CN106299705A (en) * | 2016-10-20 | 2017-01-04 | 南京理工大学 | A kind of planar broad band filter antenna |
| CN107230828A (en) * | 2017-04-15 | 2017-10-03 | 深圳市景程信息科技有限公司 | Miniaturization filtering is antenna integrated |
| CN206619694U (en) * | 2017-04-15 | 2017-11-07 | 深圳市景程信息科技有限公司 | High-gain filter antenna |
| CN107069203A (en) * | 2017-04-15 | 2017-08-18 | 深圳市景程信息科技有限公司 | Miniaturization high-gain filtering is antenna integrated |
| CN206619693U (en) * | 2017-04-15 | 2017-11-07 | 深圳市景程信息科技有限公司 | Filtering is antenna integrated |
| CN108172990A (en) * | 2017-12-13 | 2018-06-15 | 西安电子科技大学 | A kind of compact-type high-gain omnidirectional circular-polarized antenna |
| CN108767440A (en) * | 2018-05-25 | 2018-11-06 | 南京邮电大学 | Micro-strip paster antenna based on step impedance resonator |
| CN112928478B (en) * | 2021-01-25 | 2022-07-29 | 电子科技大学 | Wide-beam stepped dielectric resonator antenna based on high-order mode superposition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378712A (en) * | 1999-08-18 | 2002-11-06 | 艾利森公司 | Dual band bowtie/meander antenna |
| EP2345104B1 (en) * | 2008-11-07 | 2012-09-19 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | Differential dipole antenna system with a coplanar radiating structure and transceiver device |
| CN205211954U (en) * | 2015-11-30 | 2016-05-04 | 华南理工大学 | Filtering antenna that can restrain high frequency harmonic |
-
2015
- 2015-11-30 CN CN201510860875.3A patent/CN105449379B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378712A (en) * | 1999-08-18 | 2002-11-06 | 艾利森公司 | Dual band bowtie/meander antenna |
| EP2345104B1 (en) * | 2008-11-07 | 2012-09-19 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | Differential dipole antenna system with a coplanar radiating structure and transceiver device |
| CN205211954U (en) * | 2015-11-30 | 2016-05-04 | 华南理工大学 | Filtering antenna that can restrain high frequency harmonic |
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