CN104319473B - Ultra-wideband tri-trap antenna - Google Patents
Ultra-wideband tri-trap antenna Download PDFInfo
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- CN104319473B CN104319473B CN201410565728.9A CN201410565728A CN104319473B CN 104319473 B CN104319473 B CN 104319473B CN 201410565728 A CN201410565728 A CN 201410565728A CN 104319473 B CN104319473 B CN 104319473B
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- 239000000758 substrate Substances 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000003989 dielectric material Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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Abstract
An ultra-wideband tri-trap antenna comprises a dielectric substrate. The upper surface and the lower surface of the dielectric substrate are respectively coated with a radiation patch and a conductive layer. The radiation patch comprises a patch front end in the diameter decreasing and a micro-strip feeder line connected to the tail of the patch front end. The conductive layer comprises a base plate with arc-shape edge and a split ring reflector arranged above the base plate with arc-shape edge. The arc-shaped edge of the base plate with arc-shape edge protrudes upwards. The base plate with arc-shape edge is provided with a U-shaped groove with a downward opening. The split ring reflector comprises an upper ring with a rectangular opening, a lower ring with a rectangular opening and symmetrical branches arranged outside the rings. According to the ultra-wideband tri-trap antenna, straight grooves in both inner side edges of the U-shaped groove and wave grooves outside the U-shaped groove are used for trapping the frequency band of a wireless local area network and the C-band respectively, and the non-base plate area at the bottom of the antenna is used for trapping the downlink band of the X-band through the split ring reflector with double openings and the branches. The ultra-wideband tri-trap antenna has the advantages of being novel in overall structure, small in size, high in trap quantity, good in trap form and the like.
Description
Technical Field
The invention relates to an ultra wide band antenna, in particular to an ultra wide band triple-notch antenna.
Background
The microstrip antenna has the advantages of small volume, simple structure, convenient integration and the like, so the microstrip antenna has wide application. In recent years, research on Ultra-Wideband (Ultra-Wideband) antennas has been receiving more and more attention, and particularly, after FCC stipulates a 3.1 to 10.6GHz band as a civil band in 2002, the Ultra-Wideband antennas of the band have been developed, and the band is overlapped with some frequency bands of existing applications, such as wireless metropolitan area network (WiMax, 3.3 to 3.6GHz), C-band satellite communication (3.7 to 4.2GHz), wireless local area network (WLAN, 5.2 to 5.8GHz), X-band satellite communication (7.25 to 7.75GHz, 7.9 to 8.4GHz), and the like, so that the Ultra-Wideband notch antennas have strong practicability.
In recent years, ultra-wideband notch antennas have achieved a lot of results, the technology is mature, and the theory is fully applied. However, the application of the existing theory after further optimization is less. The ultra-wideband antenna has wide frequency band, wherein the overlapped defined and widely used frequency bands are many, so the ultra-wideband multi-notch antenna has strong practical research significance, and the antenna capable of simultaneously trapping C-band, Wireless Local Area Network (WLAN) and X-band downlink frequency bands has stronger practical use significance. The miniaturization degree of the ultra-wideband antenna is one of important indexes for measuring the performance of the antenna, and the ultra-wideband antenna can achieve a good multi-notch effect under a small size condition and becomes a development trend of the future ultra-wideband antenna.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an ultra-wideband triple-notch antenna which has a small size, a simple structure, and a large impedance bandwidth, and can suppress three waves at the same time.
In order to achieve the purpose, the invention adopts the technical scheme that: the radiation patch comprises a dielectric substrate, wherein the upper surface and the lower surface of the dielectric substrate are respectively covered with a radiation patch and a conducting layer; the radiating patch comprises a patch front end with the caliber gradually reduced from large to small and a microstrip feeder line connected to the tail part of the patch front end; the conducting layer comprises an arc-shaped edge floor and a split ring reflector arranged above the arc-shaped edge floor, the arc-shaped edge of the arc-shaped edge floor protrudes upwards, a U-shaped groove with a downward notch is formed in the arc-shaped edge floor, and the split ring reflector comprises an upper part and a lower part, wherein the upper part and the lower part are respectively provided with a circular ring with a rectangular notch, and symmetrical branches arranged on the outer side of the circular ring.
The dielectric substrate is FR4 dielectric substrate.
The radiation patch is connected with the conducting layer through the SMA connector.
The front end of the patch is a gradually-changed structure which is left by sequentially cutting off a triangular part and a trapezoidal part from the front end of the rectangular patch symmetrically on the left and right sides.
The microstrip feeder line is of a step variable-pitch structure.
The impedance of the input end of the microstrip feeder line is 50 ohms.
The U-shaped grooves are two U-shaped grooves which are arranged on the floor with the arc-shaped edge in parallel.
The slotting length of the U-shaped groove is determined by the following formula:
wherein,effis the effective dielectric constant of the dielectric material,ris the relative dielectric constant, L, of the substrateTroughIs the length of the inverted U-shaped groove, fTrapped waveIs the frequency of the desired notch.
The outer layer of the U-shaped groove is provided with a wavy U-shaped groove with vertical grooves at two side edges.
Two pairs of branches are symmetrically arranged on the outer side of the circular ring of the split ring reflector, and respectively comprise a first branch arranged horizontally and a second branch arranged below the first branch and having an included angle of 30 degrees with the horizontal direction, and the length of the second branch is larger than that of the first branch.
Compared with the prior art, the diameter of the front port of the patch of the upper surface radiation patch of the dielectric substrate is gradually reduced from large to small, the front port and the micro-strip feeder line connected to the tail of the patch are combined into a goblet-shaped structure, and the antenna is smoothly transited from one frequency resonance mode to another frequency resonance mode through the structural gradual change by combining the upward convex arc-shaped edge floor, so that good impedance matching is obtained in a wider frequency band; in addition, rectangular notches are respectively formed in the upper part and the lower part of the split ring reflector, an inner-layer ring structure and an outer-layer ring structure of the traditional split ring reflector are replaced, and the trap effect can be well adjusted through the ring and the symmetrical branches arranged on the outer side of the ring, so that the final return loss is more than-5 dB. The ultra-wideband broadband trap circuit has the advantages of simple structure, large bandwidth, large amount of trapped waves, good trapped wave form, low cost, easiness in integration and the like, and can meet the requirements of an ultra-wideband communication system.
Furthermore, the gradual change structure at the front end of the patch is a gradual change structure which is left by sequentially cutting off a triangular part and a trapezoidal part from the rectangular patch end and is symmetrical on the left side and the right side, compared with the traditional arc-shaped or oblique gradual change structure, the gradual change structure has the advantages that the size of the cut-off part is adjustable, the adjustment on the initial frequency point at the trapped wave position is obvious, and the trapped wave accuracy of the antenna is high.
Furthermore, the microstrip feeder line has a step variable-pitch structure, and an impedance converter is formed by two sections of step variable-pitch microstrips with different widths, so that the small-area radiation patch can achieve impedance matching in a side-feeding mode.
Furthermore, the U-shaped grooves are two U-shaped grooves which are arranged on the floor with the arc-shaped edge in parallel, the trapped wave of the frequency band of the wireless local area network is generated through the two U-shaped straight grooves with the downward notches, and compared with an independent U-shaped groove structure, the trapped wave structure is beneficial to improving the accuracy of the trapped wave.
Furthermore, the outer layer of the U-shaped groove is also provided with a wave U-shaped groove with vertical grooves at two side edges in a wave shape, and the wave U-shaped groove traps C wave bands. The wave groove makes full use of the length of the floor, can better achieve the trap effect and enable the antenna to be miniaturized.
Furthermore, two pairs of branches are symmetrically arranged on the outer side of the ring of the split ring reflector, and an X-band downlink frequency band trap is generated by combining the first branch arranged horizontally and the second branch arranged below the first branch and having an included angle of 30 degrees with the horizontal direction and a length larger than that of the first branch and the ring with rectangular notches arranged at the upper part and the lower part, so that the return loss at the position is increased, and the trap effect is improved.
Drawings
FIG. 1 is a schematic structural view of an upper patch of the present invention;
FIG. 2 is a schematic cut-away view of the front end of the patch of the present invention;
FIG. 3 is a schematic structural diagram of a lower-layer defected ground reflector and a reflector with a branch and node split ring according to the present invention;
FIG. 4 is a schematic diagram of return loss simulation and actual measurement results of the present invention;
FIG. 5 is a schematic diagram of simulated and measured gain for an embodiment of the present invention;
in the drawings: 1. a patch front end; 2. a microstrip feed line; 3. an arcuate edge floor; 4, U-shaped grooves; 5. a wave U-shaped groove; 6. a split ring reflector; 7. a rectangular notch; 8. a first branch section; 9. and a second branch knot.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the patch antenna of the present invention is printed in a size of 35 × 17 × 1.6mm3The FR4 dielectric substrate has an upper surface radiation patch and a lower surface conductive layer respectively coated on the upper and lower surfaces of the dielectric substrate, and is made of silver. The radiation patch is connected with the conductive layer through the SMA connector; the upper surface radiation unit is a goblet-shaped patch, the radiation patch comprises a patch front end 1 with the caliber gradually reduced from large and a step variable-pitch microstrip feeder 2 connected to the tail part of the patch front end 1, the input impedance of the microstrip feeder 2 is 50 ohms, and the patch front end 1 is a gradually-changing structure left by cutting a triangular part and a trapezoidal part from the rectangular patch front end in a left-right bilateral symmetry mode.
Referring to fig. 2, in the manufacturing process of the patch front end 1 of the present invention, the uppermost triangle and the lower two trapezoids are cut symmetrically on the left and right sides to obtain a gradual change structure, and the dotted line in the figure is a cutting line.
Referring to fig. 3, the bottom surface of the dielectric slab of the invention is provided with an arc-shaped edge floor 3 and a double-opening split ring reflector 6 with branches, the split ring reflector 6 is arranged above the arc-shaped edge floor 3, the arc-shaped edge of the arc-shaped edge floor 3 protrudes upwards, two inner-layer U-shaped grooves 4 with downward notches are arranged on the arc-shaped edge floor 3 in parallel, the outer layer of the U-shaped grooves 4 is also provided with wave U-shaped grooves 5 with vertical grooves at two sides being wavy, the split ring reflector 6 comprises two rings with rectangular notches 7 at upper and lower positions and symmetrical branches arranged at the outer sides of the rings, wherein the first branches 8 are horizontally arranged, the second branches 9 are arranged below the first branches 8, have an included angle of 30 degrees with the horizontal direction, and have a length larger than that of the first branches 8.
Referring to fig. 4, after the antenna with the structure of the invention is actually measured, the bandwidth with the return loss less than or equal to-10 dB is larger than 3.1-10.6GHz, and the notch is realized at three positions of 3.7-4.2GHz, 5.15-5.825GHz and 7.25-7.75 GHz.
Referring to fig. 5, after actual measurement, the antenna of the structure of the invention keeps relatively stable gain within the whole working frequency band range, the gain is between 2 dBi and 4dBi, and the gain of the antenna is remarkably reduced to about-4 dBi near the center frequency of three trapped waves, thereby effectively inhibiting the interference of the three waves.
According to the invention, the lower floor forms a defected ground structure by arranging the pair of parallel U-shaped straight grooves and the pair of parallel U-shaped wavy grooves on the outer layer of the lower floor, the WLAN (5.2 to 5.8GHz) and the C-band (3.7 to 4.2GHz) are respectively removed, the trap effect of the double U-shaped grooves is better than that of the single groove, and compared with the straight grooves, the effective groove length ratio of the wavy U-shaped grooves is 1.57:1, so that the size of the antenna is convenient to reduce; a double-opening split ring reflector with branches is designed in a non-floor area at the bottom of the antenna, and an X-band downlink frequency band (7.25-7.75 GHz) is sunk. The double-opening structure replaces a complex structure of an inner double-layer opening and an outer double-layer opening of a traditional split ring reflector, and the trap effect of the wave band can be improved by the two pairs of branch nodes. The antenna has the advantages of simple integral structure, low cost, small size, more trapped waves, good trapped wave form and the like.
Claims (8)
1. An ultra-wideband tri-notch antenna, comprising: the radiation patch comprises a dielectric substrate, wherein the upper surface and the lower surface of the dielectric substrate are respectively covered with a radiation patch and a conducting layer; the radiating patch comprises a patch front end (1) with the caliber gradually reduced from large to small and a microstrip feeder line (2) connected to the tail part of the patch front end (1); the conducting layer comprises an arc-shaped edge floor (3) and a split ring reflector (6) arranged above the arc-shaped edge floor (3), the arc-shaped edge of the arc-shaped edge floor (3) protrudes upwards, a U-shaped groove (4) with a downward notch is arranged on the arc-shaped edge floor (3), and the split ring reflector (6) comprises a circular ring with a rectangular notch (7) formed in the upper part and a circular ring with a symmetrical branch knot formed in the outer side of the circular ring; the front end (1) of the patch is a gradually-changed structure which is symmetrical on the left and right sides and is left by sequentially cutting off a triangular part and a trapezoidal part from the front end of the rectangular patch; the outer layer of the U-shaped groove (4) is provided with a wave U-shaped groove (5) with vertical grooves at two side edges being wave-shaped.
2. The ultra-wideband tri-notch antenna of claim 1, wherein: the dielectric substrate is FR4 dielectric substrate.
3. The ultra-wideband tri-notch antenna of claim 1, wherein: the radiation patch is connected with the conducting layer through the SMA connector.
4. The ultra-wideband tri-notch antenna of claim 1, wherein: the microstrip feeder line (2) is of a step variable-pitch structure.
5. The ultra-wideband tri-notch antenna of claim 1 or 4, wherein: the impedance of the input end of the microstrip feeder line (2) is 50 ohms.
6. The ultra-wideband tri-notch antenna of claim 1, wherein: the U-shaped grooves (4) are two U-shaped grooves which are arranged on the arc-shaped edge floor (3) in parallel.
7. The ultra-wideband tri-notch antenna of claim 1 or 6, wherein: the slotting length of the U-shaped slot (4) is determined by the following formula:
wherein,effis the effective dielectric constant of the dielectric material,ris the relative dielectric constant, L, of the substrateTroughIs the length of the inverted U-shaped groove, fTrapped waveIs the frequency of the desired notch.
8. The ultra-wideband tri-notch antenna of claim 1, wherein: two pairs of branches are symmetrically arranged on the outer side of the circular ring of the split ring reflector (6), and respectively comprise a first branch (8) which is horizontally arranged, and a second branch (9) which is arranged below the first branch (8) and has an included angle of 30 degrees with the horizontal direction, and the length of the second branch is larger than that of the first branch (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565728.9A CN104319473B (en) | 2014-10-22 | 2014-10-22 | Ultra-wideband tri-trap antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410565728.9A CN104319473B (en) | 2014-10-22 | 2014-10-22 | Ultra-wideband tri-trap antenna |
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| Publication Number | Publication Date |
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| CN104319473A CN104319473A (en) | 2015-01-28 |
| CN104319473B true CN104319473B (en) | 2017-05-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106255307A (en) * | 2015-06-14 | 2016-12-21 | 鸿富锦精密工业(武汉)有限公司 | Circuit board |
| CN105021966A (en) * | 2015-08-25 | 2015-11-04 | 胡达凯 | Simple and efficient transformer station detection system |
| CN105116288A (en) * | 2015-08-25 | 2015-12-02 | 胡达凯 | High-gain substation partial discharge signal detection system |
| CN115101925A (en) * | 2022-06-27 | 2022-09-23 | 湖北大学 | Multi-frequency broadband PIFA antenna based on defected ground |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7061442B1 (en) * | 2005-02-05 | 2006-06-13 | Industrial Technology Research Institute | Ultra-wideband antenna |
| CN102570021A (en) * | 2012-02-16 | 2012-07-11 | 厦门大学 | Trapped wave ultra-wide band antenna with triangular groove |
| CN103094683A (en) * | 2013-01-29 | 2013-05-08 | 郑州联睿电子科技有限公司 | Super-wide band antenna with notching characteristic |
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2014
- 2014-10-22 CN CN201410565728.9A patent/CN104319473B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7061442B1 (en) * | 2005-02-05 | 2006-06-13 | Industrial Technology Research Institute | Ultra-wideband antenna |
| CN102570021A (en) * | 2012-02-16 | 2012-07-11 | 厦门大学 | Trapped wave ultra-wide band antenna with triangular groove |
| CN103094683A (en) * | 2013-01-29 | 2013-05-08 | 郑州联睿电子科技有限公司 | Super-wide band antenna with notching characteristic |
Non-Patent Citations (2)
| Title |
|---|
| Compact Printed Monopole UWB Antenna loaded with Non – Concentric Open – Ended Rings for Triple Band – Notch Characteristic;G Shrikanth Reddy等;《2013 Asia-Pacific Microwave Conference Proceedings》;20131231;全文 * |
| Novel Planar UWB Monopole Antenna With Triple Band-Notched Characteristics;Wen Tao Li等;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20091020;第8卷;全文 * |
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