CN104269635A - Broadband coplane bow tie antenna with double-frequency notch reflector - Google Patents
Broadband coplane bow tie antenna with double-frequency notch reflector Download PDFInfo
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- CN104269635A CN104269635A CN201410516793.2A CN201410516793A CN104269635A CN 104269635 A CN104269635 A CN 104269635A CN 201410516793 A CN201410516793 A CN 201410516793A CN 104269635 A CN104269635 A CN 104269635A
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Abstract
The invention relates to a broadband coplane bow tie antenna with a double-frequency notch reflector. The antenna is composed of bow tie radiation patches (1), a feed transmission line (2), a dielectric substrate (5) and the notch reflector (6). The two bow tie radiation patches (1) are printed on the same face of the dielectric substrate (5) and are connected with a conduction band (3) and a ground part (4) of the feed transmission line at a transmission line tail end (10). The notch reflector (6) is formed by a left micro-strip open-circuit line (11) and a right micro-strip open-circuit line (12) of a terminal open circuit, the left micro-strip open-circuit line (11) and the right micro-strip open-circuit line (12) are different in length, a conduction band and a ground part of the left micro-strip open-circuit line (11) are connected with the conduction band (3) and the ground part (4) of the feed transmission line respectively at a first loading point (9) of the notch reflector, and a conduction band and a ground part of the right micro-strip open-circuit line (12) are connected with the conduction band (3) and the ground part (4) of the feed transmission line respectively at a second loading point (13) of the notch reflector. The notch reflector of the antenna can improve the gain of the antenna in the working frequency band of the antenna and meanwhile can serve as a filter in the two notch frequency bands lower than the working frequency band to suppress the radiation of the antenna.
Description
Technical field
The present invention relates to a kind of antenna, especially a kind of coplanar Bow―tie antenna in broadband of double frequency trap reflector, belong to the technical field that antenna manufactures.
Background technology
Antenna, not only can radiation or receive useful radiofrequency signal as front-end devices important in wireless communication system, and for other the useless or unwanted signals dropped in its working frequency range, antenna also can carry out indiscriminate radiation or reception.In some cases, this situation can cause larger interference to antenna receive-transmit system, the image frequency signal interference such as, existed in superheterodyne receiver.Super heterodyne architectures is owing to having higher sensitivity and selectivity, and it has a wide range of applications in Modern Communication System and radar system, and therefore image frequency braking measure is essential.Conventional solution for insert mirror filter in radio circuit, thus filters out the image frequency signal in Received signal strength.This reduces the performance of system to a certain extent, has increased the weight of the burden of system, has added cost needs simultaneously.Having the antenna of trap or filtering characteristic, can carry out filtering to some special frequency channel, had the function of antenna and filter concurrently, is the effective ways addressed this problem.
Bow―tie antenna, as a kind of microstrip antenna, has possessed that the low section of microstrip antenna, low cost, volume are little, lightweight, the easy advantage such as integrated with circuit board, while knot radiation patch size less, apply widely in modern wireless communication systems.But its gain is lower, be not suitable for the occasion that some gain requirements is high.
Summary of the invention
technical problem:the present invention seeks to the coplanar Bow―tie antenna in broadband proposing a kind of double frequency trap reflector, the trap reflector of this antenna had both had the effect of broadband reflector, gain in Antenna Operation frequency range is improved, also there is trap characteristic simultaneously, the aerial radiation of certain two frequency range lower than operating frequency of antenna is inhibited, and antenna structure is simple, size is less.
technical scheme:the coplanar Bow―tie antenna in broadband of double frequency trap reflector of the present invention comprises two panels knot radiation patch, feeding transmission line, medium substrate and trap reflector; Knot radiation patch, feeding transmission line and trap reflector are all on medium substrate; The shape of two panels knot radiation patch is triangle, two panels knot radiation patch is printed on the same face of medium substrate, a slice knot radiation patch is directly connected with the conduction band of feeding transmission line, and another sheet knot paster is connected at the end of feeding transmission line with the ground of the feeding transmission line of medium substrate another side through metalized ground via hole; The microstrip transmission line that trap reflector is not waited by two segment length, the micro-band open-circuit line of the left side micro-band open-circuit line and the right of open-end forms is formed; The conduction band of microstrip transmission line and ground are printed on the two sides of medium substrate respectively, and the micro-band open-circuit line of the left side micro-band open-circuit line and the right is placed in the both sides of feeding transmission line respectively, and its direction of extension is parallel with the direction that knot radiation patch stretches; First load(ing) point of trap reflector and the second load(ing) point of trap reflector are all between the input and the end of feeding transmission line of feeding transmission line, at the first load(ing) point of trap reflector, the conduction band of the micro-band open-circuit line in the left side is connected with the ground of feeding transmission line with the conduction band of feeding transmission line respectively with ground, at the second load(ing) point of trap reflector, the conduction band of the micro-band open-circuit line in the right is connected with the ground of feeding transmission line with the conduction band of feeding transmission line respectively with ground.
The width on the ground of described feeding transmission line is the widest at the input of feeding transmission line, then narrows gradually, between the input and the first load(ing) point of trap reflector of feeding transmission line, becomes the width the same with the conduction band of feeding transmission line.
The length of the micro-band open-circuit line in the described left side is about 1/4th of the first trap band wavelength, and the length of the micro-band open-circuit line in the right is about 1/4th of the second trap band wavelength, to realize the radiation of suppressing antenna in two trap frequency ranges.
The length of the left side micro-band open-circuit line and the right micro-band open-circuit line of described microstrip transmission line is all long than the length of knot radiation patch, to realize the effect of reflector; And spacing between the first load(ing) point of trap reflector and the end of feeding transmission line be about carry out near 1/4th maximum functional wavelength tuning, spacing between second load(ing) point of trap reflector and the end of feeding transmission line be about carry out near 1/4th minimum operation wavelengths tuning, to realize better reflector characteristic and matching performance simultaneously.
In two trap frequency ranges lower than operating frequency of antenna, because the micro-band open-circuit line of the left side micro-band open-circuit line and the right is all open-end, and the length of the micro-band open-circuit line in the left side is about 1/4th of the first trap band wavelength, the length of the micro-band open-circuit line in the right is about 1/4th of the second trap band wavelength, therefore the first load(ing) point of trap reflector and the second load(ing) point on feeding transmission line, in two trap frequency ranges, the input impedance of the micro-band open-circuit line of the left side micro-band open-circuit line and the right is respectively zero, therefore the first load(ing) point of trap reflector and the second load(ing) point place on feeding transmission line, total input impedance is respectively zero.Therefore the coplanar Bow―tie antenna in the broadband of double frequency trap reflector is equivalent to the transmission line of terminal short circuit two trap frequency ranges, the input signal of antenna is fed back into end by the total reflection of trap reflector on feeding transmission line, thus inhibit the aerial radiation of these two frequency ranges, form trap characteristic.At the working frequency range of antenna, the length of the micro-band open-circuit line of the left side micro-band open-circuit line and the right is all greater than 1/4th operation wavelengths, thus be greater than the length of antenna knot radiation patch, therefore trap reflector can realize the characteristic of its reflector, and antenna gain is improved.
The length of the left side micro-band open-circuit line and the right micro-band open-circuit line determines operating frequency corresponding to trap characteristic, and therefore, the length of the adjustment left side micro-band open-circuit line and the micro-band open-circuit line in the right, can distinguish two trap frequencies directly regulating trap reflector.
The operating frequency of Bow―tie antenna, is determined by the length of its knot radiation patch, and therefore, the length of adjustment knot radiation patch, directly can regulate the operating frequency of antenna.
Corresponding to the working frequency range of Bow―tie antenna, spacing between first load(ing) point of trap reflector and the end of feeding transmission line is approximately the quarter-wave of working frequency range low frequency end, spacing between second load(ing) point of trap reflector and the end of feeding transmission line is approximately the quarter-wave of working frequency range front end, like this with regard to the bandwidth of operation of broadening, the reflector performance that simultaneously can realize in wider frequency band and matching performance.
beneficial effect:the invention has the beneficial effects as follows, the coplanar Bow―tie antenna in broadband of the double frequency trap reflector proposed, its trap reflector can as reflector in the working frequency range that antenna is wider, improve the gain of antenna, trap reflector also has trap effect simultaneously, can filtering two trap in-band signals to the interference of antenna, obtain stronger suppression in the gain of trap frequency range internal antenna, and the compact dimensions of antenna.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Have in figure: knot radiation patch 1, feeding transmission line 2, the conduction band 3 of feeding transmission line, the ground 4 of feeding transmission line, medium substrate 5, trap reflector 6, microstrip transmission line 7, the input 8 of feeding transmission line, first load(ing) point 9 of trap reflector, the end 10 of feeding transmission line, the micro-band open-circuit line 11 in the left side, the micro-band open-circuit line 12 in the right, the second load(ing) point 13 of trap reflector.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The technical solution adopted in the present invention is: the coplanar Bow―tie antenna in broadband of double frequency trap reflector comprises two panels knot radiation patch 1, feeding transmission line 2, medium substrate 5 and trap reflector 6; Knot radiation patch 1, feeding transmission line 2 and trap reflector 6 are all on medium substrate 5; The shape of two panels knot radiation patch 1 is triangle, two panels knot radiation patch 1 is printed on the same face of medium substrate 5, a slice knot radiation patch is directly connected with the conduction band 3 of feeding transmission line, and another sheet knot paster is connected at the end 10 of feeding transmission line with the ground 4 of the feeding transmission line of medium substrate 5 another side through metalized ground via hole; The microstrip transmission line 7 that trap reflector 6 is not waited by two segment length, the micro-band open-circuit line 12 of the left side micro-band open-circuit line 11 and the right of open-end forms is formed; The conduction band of microstrip transmission line 7 and be printed on the two sides of medium substrate 5, the micro-band open-circuit line 12 of the left side micro-band open-circuit line 11 and the right is placed in the both sides of feeding transmission line 2 respectively, and its direction of extension is parallel with the direction that knot radiation patch 1 stretches; First load(ing) point 9 of trap reflector and the second load(ing) point 13 of trap reflector are all between the input 8 and the end 10 of feeding transmission line of feeding transmission line 2, at the first load(ing) point 9 of trap reflector, the conduction band of the micro-band open-circuit line 11 in the left side is connected with the ground 4 of feeding transmission line with the conduction band 3 of feeding transmission line 2 respectively with ground, at the second load(ing) point 13 of trap reflector, the conduction band of the micro-band open-circuit line 12 in the right is connected with the ground 4 of feeding transmission line with the conduction band 3 of feeding transmission line 2 respectively with ground.The width on the ground 4 of feeding transmission line 2 is the widest at the input 8 of feeding transmission line 2, then narrows gradually, between the input 8 and the first load(ing) point 9 of trap reflector of feeding transmission line 2, becomes the width the same with the conduction band 3 of feeding transmission line 2.The length of the micro-band open-circuit line 11 in the left side is about 1/4th of the first trap band wavelength, and the length of the micro-band open-circuit line 12 in the right is about 1/4th of the second trap band wavelength, to realize the radiation of suppressing antenna in two trap frequency ranges.The left side micro-band open-circuit line 11 of microstrip transmission line 7 and the length of the right micro-band open-circuit line 12 all long than the length of knot radiation patch 1, to realize the effect of reflector; And spacing between the first load(ing) point 9 of trap reflector and the end 10 of feeding transmission line be about carry out near 1/4th maximum functional wavelength tuning, spacing between second load(ing) point 13 of trap reflector and the end 10 of feeding transmission line be about carry out near 1/4th minimum operation wavelengths tuning, to realize better reflector characteristic and matching performance simultaneously.
In two trap frequency ranges lower than operating frequency of antenna, because the micro-band open-circuit line of the left side micro-band open-circuit line and the right is all open-end, and the length of the micro-band open-circuit line in the left side is about 1/4th of the first trap band wavelength, the length of the micro-band open-circuit line in the right is about 1/4th of the second trap band wavelength, therefore the first load(ing) point 9 and the second load(ing) point 13 of trap reflector on feeding transmission line, in two trap frequency ranges, the input impedance of the micro-band open-circuit line of the left side micro-band open-circuit line and the right is respectively zero, therefore the first load(ing) point 9 and the second load(ing) point 13 place of trap reflector on feeding transmission line, total input impedance is zero.Therefore the coplanar Bow―tie antenna in the broadband of double frequency trap reflector is equivalent to the transmission line of terminal short circuit two trap frequency ranges, the input signal of antenna is fed back into end by the total reflection of trap reflector on feeding transmission line, thus inhibit the aerial radiation of these two frequency ranges, form trap characteristic.At the working frequency range of antenna, the length of the micro-band open-circuit line of the left side micro-band open-circuit line and the right is all greater than 1/4th operation wavelengths, thus be greater than the length of antenna knot radiation patch, therefore trap reflector can realize the characteristic of its reflector, antenna gain is improved, by the distance between adjustment trap reflector and knot radiation patch, optimal antenna gain can be obtained.
For ensureing trap characteristic and reflection characteristic simultaneously, the length of the micro-band open-circuit line of the left side micro-band open-circuit line and the right is all greater than the length of antenna knot radiation patch, therefore trap frequency will lower than operating frequency of antenna, and the size of trap frequency regulates by regulating the length of the trap reflector left side micro-band open-circuit line and the micro-band open-circuit line in the right simultaneously.
Corresponding to the working frequency range of Bow―tie antenna, spacing between first load(ing) point of trap reflector and the end of feeding transmission line is approximately the quarter-wave of working frequency range low frequency end, spacing between second load(ing) point of trap reflector and the end of feeding transmission line is approximately the quarter-wave of working frequency range front end, like this with regard to the bandwidth of operation of broadening, the reflector performance that simultaneously can realize in wider frequency band and matching performance.
Structurally, the width of the conduction band 3 of the feeding transmission line of the coplanar Bow―tie antenna in broadband of this double frequency trap reflector all remains unchanged in two-wire line part and microstrip transmission line part.The width on the ground 4 of feeding transmission line is wider at the input 8 of feeding transmission line, makes input be microstrip line, is conveniently connected with feeding coaxial lines; Between first load(ing) point 9 and the end 10 of feeding transmission line of trap reflector, the width on the ground 4 of feeding transmission line is consistent with the width of conduction band 3, forms two-wire line, conveniently carries out feed to knot radiation patch 1.Between the input 8 of feeding transmission line and the first load(ing) point 9 of trap reflector, the width on ground 4 can linearly or arc gradual change.The shape of two panels knot radiation patch 1 can be triangle strip, or the shape such as triangle strip of band toothed edge.
In manufacture, the manufacturing process of the coplanar Bow―tie antenna in broadband of this double frequency trap reflector can adopt semiconductor technology, ceramic process, laser technology or printed circuit technology.The coplanar Bow―tie antenna in broadband of this double frequency trap reflector is made up of knot radiation patch 1, feeding transmission line 2, medium substrate 5 and trap reflector 6, wherein knot radiation patch 1, feeding transmission line 2 conduction band 3 and ground 4 and trap reflector 6 microstrip transmission line 7 conduction band and ground, all be made up of the conductor material that electric conductivity is good, be printed on medium substrate 5.Medium substrate 5 wants the alap dielectric material of service wear.Two panels knot radiation patch 1 is printed on the same face of medium substrate 5, a slice knot radiation patch is directly connected with the conduction band 3 of feeding transmission line, another sheet knot paster is connected at the end 10 of feeding transmission line with the ground 4 of the feeding transmission line of medium substrate 5 another side through metalized ground via hole, so that carry out feed by two-wire-microstrip-fed transmission line.The conduction band of the micro-band open-circuit line 12 of the left side micro-band open-circuit line 11 and the right of the microstrip transmission line 7 of trap reflector 6 and ground are also printed on the two sides of medium substrate 5, are connected respectively with the conduction band 3 of feeding transmission line 2 with ground 4 at the first load(ing) point 9 of trap reflector with the second load(ing) point 13.
According to the above, just the present invention can be realized.
Claims (4)
1. the coplanar Bow―tie antenna in the broadband of double frequency trap reflector, is characterized in that the coplanar Bow―tie antenna in broadband of this double frequency trap reflector comprises two panels knot radiation patch (1), feeding transmission line (2), medium substrate (5) and trap reflector (6), knot radiation patch (1), feeding transmission line (2) and trap reflector (6) are all on medium substrate (5), the shape of two panels knot radiation patch (1) is triangle, two panels knot radiation patch (1) is printed on the same face of medium substrate (5), a slice knot radiation patch is directly connected with the conduction band (3) of feeding transmission line, and another sheet knot paster is connected at the end (10) of feeding transmission line with the ground (4) of the feeding transmission line of medium substrate (5) another side through metalized ground via hole, the microstrip transmission line (7) that trap reflector (6) is not waited by two segment length, the micro-band open-circuit line (12) in the left side micro-band open-circuit line (11) and the right of open-end forms is formed, the conduction band of microstrip transmission line (7) and ground are printed on the two sides of medium substrate (5) respectively, the micro-band open-circuit line (12) in the left side micro-band open-circuit line (11) and the right is placed in the both sides of feeding transmission line (2) respectively, and its direction of extension is parallel with the direction that knot radiation patch (1) stretches, first load(ing) point (9) of trap reflector and second load(ing) point (13) of trap reflector are all positioned between the input (8) of feeding transmission line (2) and the end (10) of feeding transmission line, at first load(ing) point (9) of trap reflector, the conduction band of the micro-band open-circuit line (11) in the left side is connected with the ground (4) of feeding transmission line with the conduction band (3) of feeding transmission line (2) respectively with ground, at second load(ing) point (13) of trap reflector, the conduction band of the micro-band open-circuit line (12) in the right is connected with the ground (4) of feeding transmission line with the conduction band (3) of feeding transmission line (2) respectively with ground.
2. the coplanar Bow―tie antenna in broadband of double frequency trap reflector according to claim 1, it is characterized in that the width on the ground (4) of described feeding transmission line (2) is the widest at the input (8) of feeding transmission line (2), then narrow gradually, between the input (8) and first load(ing) point (9) of trap reflector of feeding transmission line (2), become the width the same with the conduction band of feeding transmission line (2) (3).
3. the coplanar Bow―tie antenna in broadband of double frequency trap reflector according to claim 1, it is characterized in that the length of the micro-band open-circuit line (11) in the described left side is about 1/4th of the first trap band wavelength, the length of the micro-band open-circuit line (12) in the right is about 1/4th of the second trap band wavelength, to realize the radiation of suppressing antenna in two trap frequency ranges.
4. the coplanar Bow―tie antenna in broadband of double frequency trap reflector according to claim 1, it is characterized in that the length of the micro-band open-circuit line (12) in the left side micro-band open-circuit line (11) and the right of described microstrip transmission line (7) all will be grown than the length of knot radiation patch (1), to realize the effect of reflector; And spacing between first load(ing) point (9) of trap reflector and the end (10) of feeding transmission line be about carry out near 1/4th maximum functional wavelength tuning, spacing between second load(ing) point (13) of trap reflector and the end (10) of feeding transmission line be about carry out near 1/4th minimum operation wavelengths tuning, to realize better reflector characteristic and matching performance simultaneously.
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CN201410516793.2A CN104269635A (en) | 2014-09-30 | 2014-09-30 | Broadband coplane bow tie antenna with double-frequency notch reflector |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107634341A (en) * | 2017-08-22 | 2018-01-26 | 南京邮电大学 | Double-frequency broadband butterfly shaped plane antenna |
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2014
- 2014-09-30 CN CN201410516793.2A patent/CN104269635A/en active Pending
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JPH0537226A (en) * | 1991-07-31 | 1993-02-12 | Mitsubishi Electric Corp | Print dipole antenna |
JPH11168323A (en) * | 1997-12-04 | 1999-06-22 | Mitsubishi Electric Corp | Multi-frequency antenna device and multi-frequency array antenna device using multi-frequency sharing antenna |
CN1457150A (en) * | 2002-05-06 | 2003-11-19 | 三星电子株式会社 | Image inhibiting antenna |
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Cited By (1)
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CN107634341A (en) * | 2017-08-22 | 2018-01-26 | 南京邮电大学 | Double-frequency broadband butterfly shaped plane antenna |
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