CN101394024B - Ultra-wideband elliptical slot antenna having back chamber - Google Patents
Ultra-wideband elliptical slot antenna having back chamber Download PDFInfo
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- CN101394024B CN101394024B CN200810202309A CN200810202309A CN101394024B CN 101394024 B CN101394024 B CN 101394024B CN 200810202309 A CN200810202309 A CN 200810202309A CN 200810202309 A CN200810202309 A CN 200810202309A CN 101394024 B CN101394024 B CN 101394024B
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Abstract
The invention relates to an ultra-wideband oval slit antenna with a back cavity in the technical field of the communication. The antenna comprises a printed medium plate and a metallic reflective cavity. A metallic ground with a wide slit is arranged on one side of the medium plate, a micro-band feeding source is arranged on the other side, and tuning sheets are added to the metallic reflective cavity; wherein the wide slit is an oval slit and has a rotation angle; the micro-band feeding source is formed by a circular patch connected with a gradually-changed micro-band line; a plurality of parallel triangular tuning sheets are mounted on one side of the metallic reflective cavity, and an arc-shaped metallic bottom surface is added to the other side. The impedance bandwidth of the oval slit antenna is 3.5-9.65GHz, with the VSWR smaller than 2; the gain of each sampling frequency point is higher than 8dB; the ultra-wideband oval slit antenna has the advantages of high gain, low section and better directional diagram consistency, thereby being used in radar, locating and communication systems and on application occasions requiring high gain, ultra wideband and directional radiation.
Description
Technical field
What the present invention relates to is a kind of ultra-wideband antenna of communication technical field, particularly a kind of ultra-wideband elliptical slot antenna with back of the body chamber.
Background technology
Ultra-wideband antenna receives the extensive concern of research circle for many years as the critical component in emerging civilian ultra-wideband communication system and military countermeasures set, the pulse radar etc.Ultra broadband (UWB) technology starts from the pulse communication technology of rising the sixties in 20th century, utilizes the extremely wide ultrashort pulse of frequency spectrum to communicate, and is mainly used in military radar, location and the communication system.2002 FCC (FCC) formally passed through technology is applied to civilian proposal; And approval is drawn the commercial application of making super-broadband tech with 3.1～10.6GHz frequency range; Stipulate simultaneously need have at least-the 500MHz bandwidth of 10dB greater than the UWB system of 2.5GHz to centre frequency; And centre frequency is lower than the UWB system of 2.5GHz, bandwidth should reach 20% at least.On the advantage of ultra-wideband communication system is mainly reflected in the data transfer rate height, fail safe is good, cost is low, power consumption is little and anti-multipath declines, be particularly useful for indoor wait the high-speed radio access in multi-path dense place and the reliable communication application under the complex environment.
Along with the fast development of high-velocity electrons integrated circuit and mobile communication equipment, the complanation of ultra-wideband antenna, miniaturization have become a research focus in recent years.Printed-gap antenna is simple in structure because of it, low profile, be prone to produce and to be used widely, and mainly comprises forms such as gradient prints slot antenna, wide seam printed antenna.The former typical structure has index gradual change groove, linear gradient groove, equal-width groove antenna etc.; Latter's typical structure is an etching rectangular channel on ground plate, and the back side (corresponding microstrip-fed) or middle (corresponding coplanar wave guide feedback) adopts the paster (like rectangle, circle, fan-shaped etc.) or the minor matters line (like cross, T shape, U-shaped, three fork-shapeds etc.) of different shape to encourage.Can find that through the paper retrieval adopt these structures, impedance bandwidth can reach 52%～114%, and for example add circular patch and encourage circular slit, can obtain 143.2% bandwidth with co-planar waveguide.
Literature search through to prior art is found; Chinese patent title: small super-broadband graded monopolar gap antenna; Application number: 200610038670.8, publication number: CN 1835282A, this antenna by the grading structure one pole slit on the dielectric-slab one side metal level as radiating element; Adding forked minor matters by the microstrip feed line of opposite side encourages; Satisfied the coupling requirement on the working frequency range of 3.1～10.6GHz with less size, the actual measurement frequency band upper limit is higher than 12GHz, and has obtained the gain of 3.2～4.8dB.But the character of this type antenna bidirectional is brought very big limitation to its application.Under a lot of situation, antenna must be installed in the place near ground or conductor, and must manage to change the bidirectional of antenna into one-way radiation this moment.In addition, because the bidirectional beam area is very big, its gain also is difficult to be significantly improved.
Also find Chinese patent title: super-wide band high-gain printed-gap antenna, application number: 200510111336.6 in the retrieval; Publication number: CN 1776963A; This antenna by the wide seam of rectangle on the medium substrate one side joint floor as the primary radiation source, in addition tuning with a circular patch, and encourage with little band feed that fan-shaped terminal and horizontal minor matters constitute at opposite side; Additional metal reflecting plate below whole dielectric-slab has been realized one-way radiation and has been improved gain at last.Its actual measurement impedance bandwidth is 1.97～6.05GHz, and gain is about 5.5～8dB.This antenna is through increase a simple plane reflecting plate overleaf; Make gain obtain certain raising; But its one of directly introducing reflection resonance length has caused the obvious decline of impedance bandwidth; And energy dissipation to a certain degree around simple reflecting plate has caused after all, antenna gain still has the space of further lifting.
Summary of the invention
The objective of the invention is to deficiency to prior art; A kind of ultra-wideband elliptical slot antenna with back of the body chamber is provided; Not only obtained higher gain, and, reduced the influence of reflection cavity bandwidth characteristic through inserting tuning, adjustment back of the body chamber internal structure because having increased back of the body chamber; Make it still to satisfy the ultra broadband requirement; And further improved gain, improved the consistency of directional diagram simultaneously, can be used for radar, location, communication system and some need the application scenario of high-gain, ultra broadband, directed radiation.
The present invention realizes through following technical scheme, the present invention includes a bar printing dielectric-slab and a metal reflection cavity.Dielectric-slab one side is the metal ground that has wide seam, and opposite side is little band feed, adds tuning in the metal reflection cavity.Wherein:
Said wide seam is oval slit, and an anglec of rotation is arranged;
Said little band feed is made up of the circular patch that links to each other with one section gradual change microstrip feed line;
A side is installed tuning of some parallel triangles in the said metal reflection cavity, and opposite side adds the curved metal bottom surface.
Said metallic reflection cavity main body is the can of an opening, and four triangles of the parallel placement of a side are tuning in the box, and opposite side adds the curved metal bottom surface.
For when introducing reflection cavity realization one-way radiation; Reduce its influence as far as possible, in practical application, many times still can be employed in the method for filling absorbing material in the chamber broadband character; Sponge the radiation of a direction, but such method obviously can cause very big energy dissipation.Existing plane ultra-wideband antenna is bidirectional mostly, and this type antenna often can be realized the impedance bandwidth of a plurality of frequencys multiplication, but the bidirectional characteristic has limited its application in a lot of near-earth occasions, and gain is difficult to be significantly improved.Also there is minority to realize one-way radiation and improve the antenna of gain through increasing reflection device; But this antenna has only added a simple plane reflecting plate overleaf; Though gain has obtained certain raising; But its one of directly introducing reflection resonance length has caused the obvious decline of impedance bandwidth, and simple reflecting plate caused after all around energy dissipation to a certain degree, antenna gain still has the space of further lifting.
The present invention at first improves existing ultra wide bandwidth seam antenna, introduces oval slit and also rotates, and connects circular patch with the gradual change microstrip line and encourages; Realized that (< 2 impedance bandwidth is 2.57～26.6GHz to actual measurement VSWR to the impedance bandwidth wideer than similar antenna in the domestic and foreign literature; Reach 164%, the 10.3:1 frequency multiplication), then through installing the simple metal reflection cavity additional; When guaranteeing that one-way radiation and gain improve; Reduced the gain loss that causes because of material, in the chamber, introduced multi resonant simultaneously and shake structure, also further improved gain to promote the mated bandwidth of resonant cavity; Improved the consistency (emulation impedance bandwidth is 3.5～9.65GHz, and each takes a sample the frequency gain more than 8dB) of directional diagram.
Description of drawings
Fig. 1 is a three-dimensional structure sketch map of the present invention.
Fig. 2 is the planar structure sketch map of elliptical slot antenna among the present invention;
Wherein: be positive (a), (b) be the back side.
Fig. 3 is the planar structure sketch map of metal reflection cavity among the present invention;
Wherein (a) is vertical view, (b) is end view.
Fig. 4 is the situation of the whole emulation standing-wave ratio curve of antenna of the present invention with tuning height change;
Fig. 5 is the emulation directional diagram of antenna integral body of the present invention on 3 frequencies;
Wherein: (a) being E face directional diagram, (b) is H face directional diagram.
Fig. 6 is elliptical slot antenna emulation and the comparison of surveying the standing-wave ratio curve among the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is implemented under technical scheme prerequisite of the present invention, has provided concrete execution mode and process, but protection scope of the present invention is not limited to following embodiment.
Shown in Fig. 1-2, present embodiment comprises a bar printing dielectric-slab 1 and a metal reflection cavity.Printed medium plate 1 one sides are the metal ground 2 that has wide seam, and opposite side is little band feed, add tuning in the metal reflection cavity.
Said wide seam is oval slit, and an anglec of rotation is arranged;
Said little band feed is made up of the circular patch 3 that links to each other with one section gradual change microstrip feed line 4.
Wherein the printed medium plate is the dielectric-slab 1 of a low-k.
As shown in Figure 3, the metallic reflection cavity main body is the can 5 of an opening, and four triangles of the parallel placement of a side are tuning 6 in the box, and opposite side adds curved metal bottom surface 7.
After fixing with upper-part, over against the position of microstrip feed line 4 SMA coaxial fitting 8 is set in can 5 one sides, the inner wire of SMA coaxial fitting 8 is connected to the end of microstrip feed line 4, and outer conductor connects metal ground 2.
Following map 2 specifically describes its structure with Fig. 3.
Among Fig. 2, metal ground 2 length that have the ellipse of revolution slit are L, and width is W, and oval slit major semiaxis is A, and semi-minor axis is B, the microband paste radius R
c, circular patch 3 centers and oval slit centre distance are D, oval slit is original position rotation alpha angle with axis in microstrip feed line 4.
Oval slit major axis, minor axis length are selected general 0.4～0.6 times at the minimum frequency wavelength of bandwidth, R
cGeneral with the selection of D so that approaching tangent being advisable in circular patch and oval slit.Through the ellipse of revolution slit, can further expand bandwidth, anglec of rotation α is generally 30 °～60 ° scopes.
The relative dielectric constant of dielectric-slab 1 is 2.65, and thickness is 1mm, selects lower dielectric constant and less thickness to reduce its adverse effect to the beamwidth of antenna and gain.
Among Fig. 3, tuning 6 height h
sBelow 20mm, 7 cross sections, curved metal bottom surface are 1/4th ellipses, also can be similar camber line, and height is identical with tuning 6, in order to increase mode of resonance, expand bandwidth, improve the sensing and the consistency that gain and improve directional diagram.
Fig. 4 has provided the emulation standing-wave ratio curve of antenna integral body with tuning height h
sSituation about changing can find out that antenna has good matching properties in 3.5～9.65GHz scope.
Fig. 5 is h
sThe emulation directional diagram of antenna integral body on 4G, 6G, these three frequencies of 8G during=17mm, wherein (a) is E face directional diagram, (b) is H face directional diagram, gain is all more than 8dB.
Fig. 6 can see that for the standing-wave ratio curve in independent elliptical slot antenna prototype (not with back of the body chamber) emulation does not reflect upper frequency limit basically, and promptly the theoretical upper limit frequency surpasses 40GHz, during actual welding because the influence of sub-miniature A connector has caused the appearance of upper limiting frequency.< 2, its impedance bandwidth is 2.57～26.6GHz, reaches 164%, the 10.3:1 frequency multiplication for VSWR.
Claims (5)
- One kind with the back of the body chamber ultra-wideband elliptical slot antenna; It is characterized in that comprise a bar printing dielectric-slab and a metal reflection cavity, dielectric-slab one side is the metal ground that has wide seam; Opposite side is little band feed; Add tuning in the metal reflection cavity, wherein: said wide seam is oval slit, and an anglec of rotation is arranged; Said little band feed is made up of the circular patch that links to each other with one section gradual change microstrip feed line; A side is installed tuning of some parallel triangles in the said metal reflection cavity, and opposite side adds the curved metal bottom surface.
- 2. the ultra-wideband elliptical slot antenna in the band back of the body according to claim 1 chamber is characterized in that said metallic reflection cavity main body is the can of an opening, and four triangles of the parallel placement of a side are tuning in the box, and opposite side adds the curved metal bottom surface.
- 3. the ultra-wideband elliptical slot antenna in the band back of the body according to claim 2 chamber; It is characterized in that; Said can one side is provided with the SMA coaxial fitting over against the position of microstrip feed line, and the inner wire of SMA coaxial fitting is connected to the end of microstrip feed line, and outer conductor connects metal ground.
- 4. the ultra-wideband elliptical slot antenna in band according to claim 1 back of the body chamber is characterized in that, said oval slit, and its major axis, minor axis length are at 0.4～0.6 times of the minimum frequency wavelength of bandwidth.
- 5. according to the ultra-wideband elliptical slot antenna in claim 1 or 4 described band back of the body chambeies, it is characterized in that said oval slit is original position rotation alpha angle with axis in microstrip feed line, anglec of rotation α is 30 °～60 ° scopes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810202309A CN101394024B (en) | 2008-11-06 | 2008-11-06 | Ultra-wideband elliptical slot antenna having back chamber |
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| CN200810202309A CN101394024B (en) | 2008-11-06 | 2008-11-06 | Ultra-wideband elliptical slot antenna having back chamber |
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| CN101394024A CN101394024A (en) | 2009-03-25 |
| CN101394024B true CN101394024B (en) | 2012-09-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150268325A1 (en) * | 2014-03-20 | 2015-09-24 | Electronics And Telecommunications Research Institute | Apparatus and method for estimating direction of radio frequency signal |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022703A (en) * | 2012-12-25 | 2013-04-03 | 南京邮电大学 | Broadband cavity-backed double-slot microstrip antenna |
| CN104124516B (en) * | 2014-06-12 | 2017-06-23 | 南方科技大学 | Antenna assembly and aerial array |
| CN109586014A (en) * | 2017-09-28 | 2019-04-05 | 成都海澳科技有限公司 | A kind of monopole antenna that open rectangle is intracavitary |
| CN108539434A (en) * | 2018-04-17 | 2018-09-14 | 昆山恩电开通信设备有限公司 | A kind of ultra wide band low cost radiating element and antenna |
| CN110931970B (en) * | 2019-12-10 | 2021-10-22 | 武汉滨湖电子有限责任公司 | Microstrip patch antenna unit convenient to tune |
| CN113161735B (en) * | 2021-04-02 | 2024-05-17 | 福耀玻璃工业集团股份有限公司 | Be applied to on-vehicle location antenna and vehicle glass |
| CN113161752A (en) * | 2021-04-12 | 2021-07-23 | 广州智讯通信系统有限公司 | Circularly polarized back cavity slot antenna |
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2008
- 2008-11-06 CN CN200810202309A patent/CN101394024B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| Jia Lao,et al.An Ultra-wideband Microstrip Elliptical Slot Antenna Excited by a Circular Patch.《Microwave and Optical Technology Letters》.2008,第50卷(第4期),845-846. * |
| Pengcheng Li,et al.Study of Printed Elliptical/Circular Slot Antennas for Ultrawideband Applications.《IEEE Transactions on Antennas and Propagation》.2006,第54卷(第6期),1670-1671. * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150268325A1 (en) * | 2014-03-20 | 2015-09-24 | Electronics And Telecommunications Research Institute | Apparatus and method for estimating direction of radio frequency signal |
| US9709657B2 (en) * | 2014-03-20 | 2017-07-18 | Electronics And Telecommunications Research Institute | Apparatus and method for estimating direction of radio frequency signal |
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| CN101394024A (en) | 2009-03-25 |
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