CN104241836A - Broadband coplanar bowtie antenna with trap reflector - Google Patents
Broadband coplanar bowtie antenna with trap reflector Download PDFInfo
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- CN104241836A CN104241836A CN201410516774.XA CN201410516774A CN104241836A CN 104241836 A CN104241836 A CN 104241836A CN 201410516774 A CN201410516774 A CN 201410516774A CN 104241836 A CN104241836 A CN 104241836A
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- transmission line
- feeding transmission
- trap
- line
- trap reflector
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Abstract
The invention relates to a broadband coplanar bowtie antenna with a trap reflector. The broadband coplanar bowtie antenna comprises two bowtie radiating patches (1), a feed transmission line (2), a dielectric substrate (5) and the trap reflector (6). The two bowtie radiating patches are printed on the same side of the dielectric substrate (5) and respectively connected with a conduction band (3) and a ground (4) of the feed transmission line at a transmission line tail (10). The trap reflector (6) is composed of 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 of the same length, and a conduction band and a ground of the trap reflector are respectively connected with the conduction band (3) and the ground (4) of the feed transmission line at a first load point (9) and a second load point (13) of the trap reflector. The trap reflector of the antenna can improve antenna gain within an operating frequency range of the antenna and can be used as a filter within a trap frequency range which is lower than the operating frequency range so as to suppress radiation of the antenna.
Description
Technical field
The present invention relates to a kind of antenna, especially a kind of coplanar Bow―tie antenna of broadband planar of 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 of broadband planar proposing a kind of 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 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 of broadband planar of 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 two-wire line that trap reflector is equal by two segment length, the left side two-wire open-circuit line of open-end and the right two-wire open-circuit line form is formed; The conduction band of two-wire line and ground are printed on the two sides of medium substrate respectively, and left side two-wire open-circuit line and the right two-wire open-circuit line are 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 left side two-wire open-circuit line 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 right two-wire open-circuit line 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.
Described left side two-wire open-circuit line and the length of the right two-wire open-circuit line are 1/4th of trap band wavelength, to realize the radiation of suppressing antenna in trap frequency range
The left side two-wire open-circuit line of described two-wire line and the length of the right two-wire open-circuit line 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 the trap frequency range lower than operating frequency of antenna, because left side two-wire open-circuit line and the right two-wire open-circuit line are all open-end, and the length of left side two-wire open-circuit line and the right two-wire open-circuit line is 1/4th of trap band wavelength, therefore the first load(ing) point of trap reflector and the second load(ing) point on feeding transmission line, in trap frequency range, the input impedance of left side two-wire open-circuit line and the right two-wire open-circuit line is 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 zero.Therefore the coplanar Bow―tie antenna of the broadband planar of trap reflector is equivalent to the transmission line of terminal short circuit in trap frequency range, input signal load(ing) point place of trap reflector on feeding transmission line of antenna is totally reflected and is fed back into end, thus inhibit the aerial radiation of this frequency range, form trap characteristic.At the working frequency range of antenna, the length of left side two-wire open-circuit line and the right two-wire open-circuit line 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 left side two-wire open-circuit line and the right two-wire open-circuit line determines operating frequency corresponding to trap characteristic, and therefore, the length of adjustment left side two-wire open-circuit line and the right two-wire open-circuit line, can distinguish the trap frequency 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 of broadband planar of the 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 trap in-band signal 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, two-wire line 7, the input 8 of feeding transmission line, first load(ing) point 9 of trap reflector, the end 10 of feeding transmission line, left side two-wire open-circuit line 11, the right two-wire open-circuit line 12, 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 of broadband planar of 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 two-wire line 7 that trap reflector 6 is equal by two segment length, the left side two-wire open-circuit line 11 of open-end and the right two-wire open-circuit line 12 form is formed; The conduction band of two-wire line 7 and be printed on the two sides of medium substrate 5, left side two-wire open-circuit line 11 and the right two-wire open-circuit line 12 are 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 left side two-wire open-circuit line 11 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 right two-wire open-circuit line 12 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 left side two-wire open-circuit line 11 and the right two-wire open-circuit line 12 is 1/4th of trap band wavelength, to realize the radiation of suppressing antenna in trap frequency range.The left side two-wire open-circuit line 11 of two-wire line 7 and the length of the right two-wire open-circuit line 12 longer 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 the trap frequency range lower than operating frequency of antenna, because left side two-wire open-circuit line and the right two-wire open-circuit line are all open-end, and the length of left side two-wire open-circuit line and the right two-wire open-circuit line is 1/4th of 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 trap frequency range, the input impedance of left side two-wire open-circuit line and the right two-wire open-circuit line is respectively zero, therefore the load(ing) point place of trap reflector on feeding transmission line, total input impedance is zero.Therefore the coplanar Bow―tie antenna of the broadband planar of trap reflector is equivalent to the transmission line of terminal short circuit in trap frequency range, input signal load(ing) point place of trap reflector on feeding transmission line of antenna is totally reflected and is fed back into end, thus inhibit the aerial radiation of this frequency range, form trap characteristic.At the working frequency range of antenna, the length of left side two-wire open-circuit line and the right two-wire open-circuit line 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 left side two-wire open-circuit line and the right two-wire open-circuit line 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 trap reflector left side two-wire open-circuit line and the right two-wire open-circuit line 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 of the broadband planar of this trap reflector all remains unchanged in microstrip transmission line part and two-wire 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 of broadband planar of this trap reflector can adopt semiconductor technology, ceramic process, laser technology or printed circuit technology.The coplanar Bow―tie antenna of broadband planar of this 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 two-wire 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 micro-band-two-wire line.The left side two-wire open-circuit line 11 of the two-wire line 7 of trap reflector 6 and the conduction band of the right two-wire open-circuit line 12 are also printed on the two sides of medium substrate 5 with ground, 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 of the broadband planar of trap reflector, is characterized in that the coplanar Bow―tie antenna of the broadband planar of this 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 two-wire line (7) that trap reflector (6) is equal by two segment length, left side two-wire open-circuit line (11) of open-end and the right two-wire open-circuit line (12) form is formed, the conduction band of two-wire line (7) and ground are printed on the two sides of medium substrate (5) respectively, left side two-wire open-circuit line (11) and the right two-wire open-circuit line (12) are 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 on left side two-wire open-circuit line (11) 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 on the right two-wire open-circuit line (12) 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 of broadband planar of 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 of broadband planar of trap reflector according to claim 1, it is characterized in that the length on described left side two-wire open-circuit line (11) and the right two-wire open-circuit line (12) is 1/4th of trap band wavelength, to realize the radiation of suppressing antenna in trap frequency range.
4. the coplanar Bow―tie antenna of broadband planar of trap reflector according to claim 1, it is characterized in that left side two-wire open-circuit line (11) of described two-wire line (7) and the length on the right two-wire open-circuit line (12) 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410516774.XA CN104241836A (en) | 2014-09-30 | 2014-09-30 | Broadband coplanar bowtie antenna with trap reflector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410516774.XA CN104241836A (en) | 2014-09-30 | 2014-09-30 | Broadband coplanar bowtie antenna with trap reflector |
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| CN104241836A true CN104241836A (en) | 2014-12-24 |
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| CN201410516774.XA Pending CN104241836A (en) | 2014-09-30 | 2014-09-30 | Broadband coplanar bowtie antenna with trap reflector |
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2014
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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 |
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| WO2013166589A1 (en) * | 2012-05-08 | 2013-11-14 | Peraso Technologies Inc. | Broadband end-fire multi-layer yagi antenna |
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