CN105449379A - Filtering antenna capable of restraining high frequency harmonic waves - Google Patents
Filtering antenna capable of restraining high frequency harmonic waves Download PDFInfo
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- CN105449379A CN105449379A CN201510860875.3A CN201510860875A CN105449379A CN 105449379 A CN105449379 A CN 105449379A CN 201510860875 A CN201510860875 A CN 201510860875A CN 105449379 A CN105449379 A CN 105449379A
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- dielectric
- pass filter
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- slab
- low pass
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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 filtering antenna capable of restraining high frequency harmonic waves. The filtering antenna comprises a dielectric plate, a stepped-impedance resonator, a stepped-impedance symmetrical oscillator, a low-pass filter and a feed unit; the stepped-impedance resonator and the stepped-impedance symmetrical oscillator are both arranged on the top layer of the dielectric plate; the stepped-impedance resonator is close to the stepped-impedance symmetrical oscillator to form an antenna unit; an upper conductor of the low-pass filter is arranged on the top layer of the dielectric layer, and is connected with a left arm of the stepped-impedance symmetrical oscillator; a lower conductor of the low-pass filter is arranged on the bottom layer of the dielectric plate and connected with a right arm of the stepped-impedance symmetrical oscillator through a via hole; an upper conductor of the feed unit is arranged on the top layer of the dielectric plate and connected with the upper conductor of the low-pass filter; a lower conductor of the feed unit is arranged on the bottom layer of the dielectric plate and connected with the low conductor of the low-pass filter; and the projection of the upper conductor of the feed unit on the bottom layer of the dielectric layer is positioned in the center of the lower conductor. The filtering antenna capable of restraining high frequency harmonic waves has the characteristics of high rectangle degree and capability of effectively restraining harmful harmonic waves.
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 mobile communications field.
Background technology
Along with the fast development of wireless communication technology, frequency microwave requirement on devices is compacter dimensionally, the development of various multifunction device is proved to be the good method addressed this problem, traditional filter and antenna are two independently devices, be separately design in a wireless communication system, filter antenna is the integrated of antenna and filter and has the function of two kinds of devices.
Have the much research about filter antenna recent years, document [1] proposes a kind of method of filter and antenna synthesis design; The comprehensive filter antenna out in document [2]-[4] has good frequency selectivity; Document [5] is by introducing short circuit via hole; Document [6] allows antenna have better rectangular degree by adding a parasitic element.
Although above-mentioned filter antenna has good filtering selectivity, they cannot suppress high order harmonic component, and the radiation of high order harmonic component can cause extra power loss, and produce signal disturbing.
List of references:
[1]C.T.ChuangandS.J.Chung，“Synthesisanddesignofanewprintedfilteringantenna，”IEEETrans.AntennasPropag.，vol.59，no.3，pp.1036-1042，Mar.2011.
[2]W.-J.Wu，Y.-Z.Yin，S.-L.Zuo，Z.-Y.Zhang，andJ.-J.Xie，“Anewcompactfilter-antennaformodernwirelesscommunicationsystems，”IEEEAntennasWirelessPropag.Lett..，vol.10，pp.1131-1134，2011.
[3]C.-T.ChuangandS.-J.Chung“Acompactprintedfilteringantennausingaground-intrudedcoupledlineresonator”，IEEETrans.AntennasPropag.，vol.59，no.10，pp.3630-3637，Oct.2011.
[4]C.-K.LinandS.-J.Chung“Acompactfilteringmicrostripantennawithquasi-ellipticbroadsideantennagainresponse”，IEEEAntennasWirelessPropag.Lett.，vol.10，pp.381-384，2011.
[5]S.W.Wong，T.G.Huang，C.X.Mao，Z.N.Chen，andQ.X.Chu“Planarfilteringultra-wideband(UWB)antennawithshortingpins”，IEEETrans.AntennasPropag.，vol.61，no.2，pp.948-953，Feb.2013.
[6]J.Wu，Z.Zhao，Z.Nie，andQ.Liu，“Aprintedunidirectionalantennawithimprovedupperband-edgeselectivityusingaparasiticloop”，IEEETrans.AntennasPropag.，vol.63，no.4，pp.1832-1873，Apr.2015。
Summary of the invention
The object of the invention is the defect in order to solve above-mentioned prior art, provide a kind of filter antenna that can suppress high-frequency harmonic, this filter antenna not only has the feature of high rectangle degree, and effectively can suppress unwanted harmonics.
Object of the present invention can reach by taking following technical scheme:
A kind of filter antenna that can suppress high-frequency harmonic, comprise dielectric-slab, step electric impedance resonator, stepped impedance symmetrical dipole, low pass filter and feed element, described step electric impedance resonator and stepped impedance symmetrical dipole are all arranged on the top layer of dielectric-slab, step electric impedance resonator, near stepped impedance symmetrical dipole, forms antenna element together;
The upper conductor of described low pass filter is arranged on the top layer of dielectric-slab, and connects with the left arm of stepped impedance symmetrical dipole, and the lower conductor of low pass filter is arranged on the bottom of dielectric-slab, and is connected with the right arm of stepped impedance symmetrical dipole by a via hole;
The upper conductor of described feed element is arranged on the top layer of dielectric-slab, and connect with the upper conductor of low pass filter, the lower conductor of feed element is arranged on the bottom of dielectric-slab, and connect with the lower conductor of low pass filter, the projection of upper conductor on dielectric-slab bottom of feed element is positioned at the lower conductor center of feed element.
As a kind of preferred version, the upper conductor of described low pass filter comprises the first connected strip line and the first triangular structure of right angle, the lower conductor of described low pass filter comprises the second connected strip line and the second triangular structure of right angle, described first triangular structure of right angle connects with the left arm of stepped impedance symmetrical dipole, described second triangular structure of right angle is connected with the right arm of stepped impedance symmetrical dipole by a via hole, and described first strip line and the second strip line are parallel to each other.
As a kind of preferred version, one end of the upper conductor of described feed element connects with the upper conductor of low pass filter, and the other end is positioned at the lower edge of dielectric-slab top layer, and connects with coaxial line; One end of the lower conductor of described feed element connects with the lower conductor of low pass filter, and the other end is positioned at the lower edge of dielectric-slab bottom.
As a kind of preferred version, described coaxial line is the coaxial line of 50 ohm.
As a kind of preferred version, the upper conductor of described feed element is rectangular microstrip line.
As a kind of preferred version, the lower conductor of described feed element is gradual change microstrip line.
As a kind of preferred version, described gradual change microstrip line is the microstrip line of the right and left ovalize gradual change.
As a kind of preferred version, described step electric impedance resonator is concave shape.
As a kind of preferred version, described dielectric-slab adopts thickness to be 0.8mm, and dielectric constant is the pcb board of 2.55.
As a kind of preferred version, the gross area of described antenna element and low pass filter is 34mm × 33mm.
The present invention has following beneficial effect relative to prior art:
1, in filter antenna of the present invention, step electric impedance resonator and stepped impedance symmetrical dipole are arranged on the top layer of dielectric-slab, and form antenna element, stepped impedance symmetrical dipole, as main radiating element, by high order harmonic component toward high frequency displacement, can reduce high order harmonic component to the impact of radiation, and step electric impedance resonator rank are near stepped impedance symmetrical dipole, be a parasitic step electric impedance resonator, a radiation zero can be increased at high frequency stopband, improve the selectivity of antenna; In addition, low pass filter can harmonic carcellation further, and the high frequency stopband of antenna element is further improved.
2, filter antenna of the present invention shows through experimental result, has the fractional bandwidth of 25%, and in the frequency range of 2.5GHz to 3.3GHz, return loss is less than-10dB, and does not have the radiation of harmonic wave in the frequency range of 4.0GHz to 14.0GHz; Meanwhile, the radiation gain in passband is approximately 2.5dBi, exceeds 10.3dBi than the maximum gain of high frequency stopband.
3, filter antenna of the present invention be of compact construction, Wide stop bands and the simple advantage of feed, a series of application can be had in wireless communications.
Accompanying drawing explanation
Fig. 1 is filter antenna perspective view of the present invention.
Fig. 2 is filter antenna planar structure schematic diagram of the present invention.
Fig. 3 is the physical quantity sign picture of various piece in structure shown in Fig. 2.
Fig. 4 is the return loss of filter antenna of the present invention | S11| simulate and test result curve figure.
Fig. 5 is the gain simulate and test result curve figure of filter antenna of the present invention.
Fig. 6 is the antenna pattern in filter antenna of the present invention H face when frequency is 2.9GHz.
Fig. 7 is the antenna pattern in filter antenna of the present invention E face when frequency is 2.9GHz.
Wherein, 1-dielectric-slab, 2-step electric impedance resonator, 3-stepped impedance symmetrical dipole, 4-low pass filter, 5-feed element, 6-first strip line, 7-first triangular structure of right angle, 8-second strip line, 9-second triangular structure of right angle, 10-via hole, 11-rectangular microstrip line, 12-gradual change microstrip line.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As depicted in figs. 1 and 2, the filter antenna of the present embodiment comprises dielectric-slab 1, step electric impedance resonator 2, stepped impedance symmetrical dipole 3, low pass filter 4 and feed element 5;
Described dielectric-slab 1 adopts that thickness is 0.8mm, dielectric constant is the pcb board of 2.55;
Described step electric impedance resonator 2 and stepped impedance symmetrical dipole 3 are all arranged on the top layer of dielectric-slab 1, and step electric impedance resonator 2, near stepped impedance symmetrical dipole 3, forms antenna element together; Wherein, described stepped impedance symmetrical dipole 3, as main radiating element, by high order harmonic component toward high frequency displacement, can reduce high order harmonic component to the impact of radiation; Described step electric impedance resonator 2, in concave shape, is a parasitic step electric impedance resonator, can increases a radiation zero, improve the selectivity of antenna at high frequency stopband;
The upper conductor of described 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, described upper conductor comprises the first connected strip line 6 and the first triangular structure of right angle 7, first triangular structure of right angle 7 connects with the left arm of stepped impedance symmetrical dipole 3; Described lower conductor comprises the second connected strip line 8 and the second triangular structure of right angle 9, and described second triangular structure of right angle 9 is connected with the right arm of stepped impedance symmetrical dipole 3 by a via hole 10, and described first strip line 6 and the second strip line 8 are parallel to each other; This low pass filter 4 can harmonic carcellation further, and the high frequency stopband of antenna element is further improved;
The gross area of described antenna element and low pass filter 4 is 34mm × 33mm, suitable with the size of traditional half-wave doublet with quarter-wave feeder line;
The upper conductor of described feed element 5 is rectangular microstrip line 11, and it is arranged on the top layer of dielectric-slab 1, and one end connects with the upper conductor of low pass filter 4, and the other end is positioned at the lower edge of dielectric-slab 1 top layer, and connects with the coaxial line of 50 ohm; The lower conductor of described feed element 5 is gradual change microstrip line 12, this gradual change microstrip line 12 is the microstrip line of the right and left ovalize gradual change, 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 positioned at the lower edge of dielectric-slab 1 bottom; The projection of rectangular microstrip line 11 on dielectric-slab 1 bottom is positioned at the center of gradual change microstrip line 12.
In the filter antenna of the present embodiment, the physical quantity of various piece as shown in Figure 3, and concrete physical dimension is as shown in table 1 below.
| L 1 | L 2 | L 3 | L 4 | L d1 | L d2 | L p1 |
| 2.5mm | 3mm | 6.5mm | 2mm | 8mm | 8mm | 6.5mm |
| L p2 | L o | L f | W 1 | W 2 | W 3 | W 4 |
| 6.5mm | 1.63mm | 21mm | 0.4mm | 5mm | 0.6mm | 6.5mm |
| W d1 | W d2 | W p1 | W p2 | W f | W g | S |
| 0.75mm | 6mm | 0.5mm | 3.5mm | 2.2mm | 20mm | 0.4mm |
The physical dimension of table 1 filter antenna
The return loss of the filter antenna of the present embodiment | S11| simulate and test result is as shown in Figure 4, as we can see from the figure, simulate and test result is coincide, the filter antenna of the present embodiment has the fractional bandwidth of 25%, in the frequency range of 2.5GHz to 3.3GHz | S11| <-10dB; Emulation and experimental result all show the radiation not having harmonic wave in the frequency range of 4.0GHz to 14.0GHz.
As shown in Figure 5, as we can see from the figure, the radiation gain in passband is approximately 2.5dBi, exceeds 10.3dBi than the maximum gain of high frequency stopband for the gain emulation of the Y-axis positive direction of the filter antenna of the present embodiment and test result; Go out obviously to have a radiation zero at 4.5GHz, this illustrates that the rectangular degree of the upper sideband of filter antenna is well improved by introducing parasitic step electric impedance resonator.
Respectively as shown in Figure 6 and Figure 7, main polarization parallel with X-direction, cross polarization is parallel with Y direction for the antenna pattern of filter antenna H face (YoZ face) and E face (XoZ plane) when frequency is 2.9GHz of the present embodiment; As can see from Figure 6, antenna is omnidirectional at the directional diagram in H face, as can see from Figure 7, be a figure of eight, and total antenna pattern is similar to traditional doublet antenna at the directional diagram in E face.
In sum, in filter antenna of the present invention, the radiation zero that parasitic step electric impedance resonator produces can improve the selectivity of antenna, experimental result shows that the upper stopband of filter antenna is extended to 14GHz, achieve the impedance bandwidth of 27.5%, in band, radiation gain is than stopband maximum gain height 10.3dBi; Experimental result also proves that filter antenna has good characteristic, such as can be wider with radiating bands, and Wide stop bands suppresses; The simple advantage of compact structure, Wide stop bands and feed, can make this filter antenna have a series of application in wireless communications.
The above; be only patent preferred embodiment of the present invention; but the protection range of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in patent of the present invention; be equal to according to the technical scheme of patent of the present invention and inventive concept thereof and replace or change, all belonged to the protection range of patent of the present invention.
Claims (10)
1. one kind can be suppressed the filter antenna of high-frequency harmonic, comprise dielectric-slab, it is characterized in that: also comprise step electric impedance resonator, stepped impedance symmetrical dipole, low pass filter and feed element, described step electric impedance resonator and stepped impedance symmetrical dipole are all arranged on the top layer of dielectric-slab, step electric impedance resonator, near stepped impedance symmetrical dipole, forms antenna element together;
The upper conductor of described low pass filter is arranged on the top layer of dielectric-slab, and connects with the left arm of stepped impedance symmetrical dipole, and the lower conductor of low pass filter is arranged on the bottom of dielectric-slab, and is connected with the right arm of stepped impedance symmetrical dipole by a via hole;
The upper conductor of described feed element is arranged on the top layer of dielectric-slab, and connect with the upper conductor of low pass filter, the lower conductor of feed element is arranged on the bottom of dielectric-slab, and connect with the lower conductor of low pass filter, the projection of upper conductor on dielectric-slab bottom of feed element is positioned at the lower conductor center of feed element.
2. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterized in that: the upper conductor of described low pass filter comprises the first connected strip line and the first triangular structure of right angle, the lower conductor of described low pass filter comprises the second connected strip line and the second triangular structure of right angle, described first triangular structure of right angle connects with the left arm of stepped impedance symmetrical dipole, described second triangular structure of right angle is connected with the right arm of stepped impedance symmetrical dipole by a via hole, and described first strip line and the second strip line are parallel to each other.
3. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, it is characterized in that: one end of the upper conductor of described feed element connects with the upper conductor of low pass filter, the other end is positioned at the lower edge of dielectric-slab top layer, and connects with coaxial line; One end of the lower conductor of described feed element connects with the lower conductor of low pass filter, and the other end is positioned at the lower edge of dielectric-slab bottom.
4. a kind of filter antenna that can suppress high-frequency harmonic according to claim 3, is characterized in that: described coaxial line is the coaxial line of 50 ohm.
5. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, is characterized in that: the upper conductor of described feed element is rectangular microstrip line.
6. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, is characterized in that: the lower conductor of described feed element is gradual change microstrip line.
7. a kind of filter antenna that can suppress high-frequency harmonic according to claim 6, is characterized in that: described gradual change microstrip line is the microstrip line of the right and left ovalize gradual change.
8. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, is characterized in that: described step electric impedance resonator is concave shape.
9. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, is characterized in that: described dielectric-slab adopts thickness to be 0.8mm, and dielectric constant is the pcb board of 2.55.
10. a kind of filter antenna that can suppress high-frequency harmonic according to claim 1, is characterized in that: the gross area of described antenna element 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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| CN105449379A true CN105449379A (en) | 2016-03-30 |
| CN105449379B CN105449379B (en) | 2018-04-13 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299705A (en) * | 2016-10-20 | 2017-01-04 | 南京理工大学 | A kind of planar broad band 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 |
| 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 |
| 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 |
| WO2018188303A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Integrated filter antenna |
| WO2018188302A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | High-gain filter antenna |
| CN108767440A (en) * | 2018-05-25 | 2018-11-06 | 南京邮电大学 | Micro-strip paster antenna based on step impedance resonator |
| 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 |
| CN112928478A (en) * | 2021-01-25 | 2021-06-08 | 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 |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| WO2018188304A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Miniature, high-gain, integrated filter antenna |
| WO2018188303A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Integrated filter antenna |
| WO2018188305A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | Miniature integrated filter antenna |
| WO2018188302A1 (en) * | 2017-04-15 | 2018-10-18 | 深圳市景程信息科技有限公司 | High-gain filter antenna |
| 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 |
| CN112928478A (en) * | 2021-01-25 | 2021-06-08 | 电子科技大学 | Wide-beam stepped dielectric resonator antenna based on high-order mode superposition |
| 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 |
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