CN203166075U - Small high isolation dual notch UWB MIMO antenna - Google Patents
Small high isolation dual notch UWB MIMO antenna Download PDFInfo
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- CN203166075U CN203166075U CN 201220652453 CN201220652453U CN203166075U CN 203166075 U CN203166075 U CN 203166075U CN 201220652453 CN201220652453 CN 201220652453 CN 201220652453 U CN201220652453 U CN 201220652453U CN 203166075 U CN203166075 U CN 203166075U
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Abstract
The utility model provides a small high isolation dual notch UWB MIMO antenna. The antenna comprises a main floor, a first floor branch, a second floor branch, a first metal belt, a second metal belt, a third metal belt which is connected with the two floor branches, a first antenna unit, a second antenna unit, a first tail end opening gap and a second tail end opening gap. Due to the application of the two floor branches, a first excitation port and a second excitation port can be placed at the upper edge of the substrate, which can effectively improve the impedance bandwidth of each antenna unit and effectively increases the isolation between the two antenna units. The technical problem that the existing UWB MIMO antenna cannot simultaneously realize small size, small cross coupling and broad bandwidth is solved. The first metal belt and the first antenna unit form a first annular loop, and the second metal belt and the second antenna unit form a second annular loop, so that high frequency notch is realized. Due to the application of the first tail end opening gap and the second tail end opening gap, low frequency notch is realized, and the function of dual notch is realized.
Description
Technical field
The utility model relates to UWB (ultra-wideband, ultra broadband) MIMO(Multiple-Input Multiple-Output, multiple-input and multiple-output) antenna technical field, more particularly, relate to a kind of two trap UWB MIMO antennas of small-sized high-isolation.
Background technology
Along with the arrival of mobile broadband era, wireless network is to the fast development of multifrequency multi-modulation scheme, also, the website load-bearing restriction limited because of the website space of existing antenna system, do not support problem such as new technology evolution to be faced with lot of challenges.Most of operation commercial city has proposed the transformation demand to antenna system, new antenna not only needs to support the multifrequency multi-modulation scheme, also need to keep size constancy, can support new technology evolution such as multiple-input and multiple-output (MIMO, Multiple-Input-Multiple-Output), thereby cooperate main equipment to promote network performance, strengthen the user and experience.From present technical development, the MIMO technology is the LTE (core technology of (Long Term Evolution, the Long Term Evolution of 3G) and the 4th third-generation mobile communication (4G).The MIMO technology has fully been developed space resources, utilize a plurality of antennas to realize MIMO, on the limited frequency spectrum resources and under the fixing transmitting power, can realize two-forty and large-capacity data transfer rate, be to increase the very effective a kind of method of wireless communication system spectrum efficiency.Mimo system can also realize increasing substantially the reliability and stability of wireless communication system by diversity gain.The MIMO technology has been regarded as the important component part of the 4th third-generation mobile communication technology and the strong interest on the boundary that is subjected to communicating by letter.
The MIMO antenna is the vitals of mimo wireless communication system, and the MIMO antenna performance directly affects the performance of whole system, so the design of MIMO antenna has become the research focus of microwave regime.For the base station, because free space is big, the application of multi-antenna technology is accomplished easily.But for handheld device, a plurality of antennas are integrated in the little space, can cause very big mutual coupling, this just causes the correlation between antenna element very big, the diversity performance of antenna just descends thereupon, can't reach the linear ratio increment of number of antennas of channel capacity and MIMO antenna system, perhaps the stability of channel is along with the trend of mimo system number of antennas increase.How under the prerequisite that guarantees miniature antenna size, high antenna performance, the coupling that reduces between antenna element is the difficult point of MIMO antenna design, the main method that reduces at present to be coupled has: adopt the defective floor panel structure, embed the slit on the floor, add reflector element, increase floor branch, in the application and line, decoupling circuit etc.The design of existing MIMO antenna mainly all is to adopt one of above method to reduce mutual coupling, but the bandwidth of most of design is all narrow and size antenna is bigger.The ultra broadband MIMO antenna of the having reported design that quantity is few, size is all bigger, and can not realize two trap requirements, will avoid the mutual interference mutually with other communication system (WIMAX3.3-3.6GHz and WALN5.2-5.8GHz) like this, therefore, little, the good radiation efficiency of size, omnidirectional's coverage property, high isolation, two trap UWB MIMO antenna become current research focus.
The MIMO The Application of Technology utilizes multiplex technique to improve the transmission capacity of channel on the one hand, can utilize diversity technique to improve the reliability of channel on the other hand.Studies show that the UWB communication system has low radiant power, high data transmission rate, it is fit to radar system and short haul connection very much, and the MIMO technology is applied in the UWB system, then can improve the transfer rate of system significantly.The present few UWB MIMO antenna of quantity, size is all bigger, and does not realize trap function, and they mainly use conventional methods the isolation that improves between antenna element.
Summary of the invention
The utility model can't be realized the technical problem of small size, little mutual coupling, wide bandwidth, trap function simultaneously in order to solve existing UWB MIMO antenna, a kind of small-sized, high-isolation, two trap UWB MIMO antenna have been proposed, can effectively improve the impedance bandwidth of antenna element, realize two trap functions, can also increase the isolation between two antenna elements effectively.
The utility model adopts following technical scheme to solve above-mentioned technical problem: the two trap UWB MIMO antennas of small-sized high-isolation comprise the floor, the first floor minor matters, the second floor minor matters, first antenna element and second antenna element that are printed on substrate back; The first floor minor matters and the second floor minor matters symmetry are placed; First antenna element and second antenna element form symmetrical structure, and are placed on two corners of described substrate; The excitation port of the excitation port of first antenna element and second antenna element is placed on described substrate top edge, and the excitation port of first antenna element is connected with the first floor minor matters, and the excitation port of second antenna element is connected with the second floor minor matters.Because the first floor minor matters and the second floor minor matters have also participated in radiation, they can be counted as the part of first antenna element and second antenna element respectively, increased effective electrical length of first antenna element and second antenna element effectively, thereby reduction operating frequency of antenna, expand bandwidth, be conducive to realize the miniaturization of antenna.On the other hand, because the application of the first floor minor matters and the second floor minor matters, the excitation port of first antenna element and second antenna element can be arranged on the edge of substrate, the path along floor surface has just been increased widely between the two-port like this, thereby the isolation between two antenna elements has obtained the improvement of arriving very much.
The back side of described substrate is printed with first metal tape and second metal tape, and the two ends of first metal tape and first antenna element are provided with first lap, and the two ends of second metal tape and second antenna element are provided with second lap; First metal tape and first antenna element form the first coupling circular path by described first lap, and second metal tape and second antenna element form the second coupling circular path by described second lap; The described first coupling circular path and the second coupling circular path have destroyed first antenna element and the impedance matching of second antenna in certain frequency range respectively, thereby make win antenna element and second antenna element be implemented in trap function in this frequency range.
Preferably, also embed the first terminal open circuit slit at described first antenna element, embed the second terminal open circuit slit at described second antenna element; The described first terminal open circuit slit, the second terminal open circuit slit make first antenna element and second antenna element most energy in certain frequency band be launched back respectively, thereby make win antenna element and second antenna element be implemented in the trap function of certain frequency range.
Be provided with first microstrip line between the excitation port of described first antenna element and first antenna element.Be provided with second microstrip line between the excitation port of described second antenna element and second antenna element.
Described first antenna element is antenna element; Second antenna element is antenna element.
Principle of the present utility model is as follows: two UWB antenna elements are placed on symmetrically on two corners of substrate, introduce two rectangle floor branches and make the feed port of two antenna elements can be placed on the top edge of substrate, thereby realize good impedance matching and the high-isolation between antenna element.In addition, in order to obtain the high frequency trap, each antenna element is respectively introduced a little metal tape, namely utilizes loop checking installation to realize the high frequency trap; For acquiring the low frequency trap, on the radiant body of each antenna element, respectively embed an open-ended slit, namely utilize the slit of terminal open circuit to realize the low frequency trap.This MIMO antenna is fit to be applied to can provide good diversity gain in the multipath communication environment in the system as mobile terminal devices such as mobile phone, notebooks, and the opposing multipath fading improves stability and the reliability of the wireless UWB communication system of system.
Compared with prior art, the utlity model has following advantage:
1, the existing small-sized UWB MIMO of mobile terminal device antenna design, mainly utilize the isolation between technological means raising antenna elements such as decoupling zero network, slit, floor, reflector element, and these decoupling methods only are fit to be applied in the bigger UWBMIMO antenna of size, and the antenna element modes of emplacement of the uniqueness that proposes in this patent: two UWB antenna elements are placed on symmetrically on two corners of substrate, introduce the floor branch of two rectangles, the excitation port of two antenna elements is placed on the top edge of substrate.The antenna element modes of emplacement of this uniqueness on the one hand can improve impedance bandwidth effectively, can increase on the one hand in addition between two antenna elements along the path of floor surface, then increases the direct isolation of two antenna elements effectively.
2, this patent proposes to add metal tape at the back side of substrate, and this metal tape and antenna element are formed the loop checking installation of coupling, utilize this loop checking installation can obtain high frequency trap effect effectively.This trap structure is very little to the influence of the frequency band beyond the trap frequency, so it is very little to the influence of the isolation in the bandwidth of operation beyond the trap frequency band.Change the width w of metal tape
s, then can control the frequency location of trap frequency band effectively.
3, the slit at antenna element embedding terminal open circuit of this patent proposition, can obtain low frequency trap effect effectively, and this trap structure is very little to the influence of the frequency band beyond the notch bandwidth, so it is very little that it is used the influence of the isolation in the bandwidth of operation beyond the trap frequency band, is fit to be applied in the UWB MIMO antenna and realizes trap function.
4, compare with existing mobile terminal device UWB MIMO antenna design, the utility model has been realized the trap effect, and has littler size, simpler structure, thus can reduce production costs, be applicable in the various multifunctional small-size handheld devices.
Description of drawings
Fig. 1 (a) is that antenna element is placed schematic diagram;
Fig. 1 (b) is the UWB MIMO antenna structure view of high-isolation;
Fig. 1 (c) is the Electromagnetic Simulation curve of the frequency response of antenna shown in Fig. 1 (b);
Fig. 2 (a) utilizes metal tape to produce the UWB MIMO antenna structure view of the band trap of loop checking installation;
Fig. 2 (b) is that antenna shown in Fig. 2 (a) is along with metal (19a, 19b) bandwidth w
sThe frequency response Electromagnetic Simulation curve that changes and change;
Fig. 3 (a) utilizes the terminal open circuit slit to produce the UWB MIMO antenna structure view of trap;
Fig. 3 (b) is that antenna shown in Fig. 3 (a) is along with terminal open circuit gap length s
lThe frequency response Electromagnetic Simulation curve that changes and change;
Fig. 4 (a) is the two trap UWB MIMO antenna structure views of the related small-sized high-isolation of the utility model;
Fig. 4 (b) is the frequency response Electromagnetic Simulation curve of antenna shown in Fig. 4 (a).
Wherein: 11 is substrate, 12 is substrate front side, 13 is substrate back, 14 is the rectangle floor, 15a, 15b is respectively the first floor minor matters that are printed on substrate, the second floor minor matters, 16a, 16b is respectively first antenna element that is printed on substrate front side UWB MIMO antenna, second antenna element, 17a, 17b is respectively first excitation port of first antenna element and second excitation port of second antenna element, 18a, 18b is respectively that first antenna element is printed on substrate front side, and what be that 50 ohm first microstrip line and second antenna element be printed on substrate front side is 50 ohm second microstrip line, 19a is first metal tape that is printed on substrate back, 19b is second metal tape that is printed on substrate back, 110a, 111a is the lap of first metal tape and first antenna element, 110b, 111b is the lap of second metal tape and second antenna element, 112a, 112b is respectively the first terminal open circuit slit and the second terminal open circuit slit above embedding second antenna element that embeds above first antenna element, the 113rd, the tri-metallic strip of the connection first floor minor matters and the second floor minor matters.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail.
Embodiment
Referring to Fig. 1-4, the first floor minor matters 15a and the second floor minor matters 15b that the floor that the UWB MIMO antenna that the utility model proposes adopts is placed by rectangle floor 14 and two symmetries are formed.The first antenna element 16a and the second antenna element 16b form symmetrical structure, and are placed on two corners of substrate 11.Because the first excitation port 17a of the first antenna element 16a and the second excitation port 17b of the second antenna element 16b are placed on the top edge of substrate 11.The first excitation port 17a, the second excitation port 17b are connected, rather than directly are linked to rectangle floor 14 with the first floor minor matters 15a, the second floor minor matters 15b respectively.
The antenna element modes of emplacement of above-mentioned this novelty, on the one hand, because the first floor minor matters 15a and the second floor minor matters 15b have also participated in radiation, they can be counted as the part of the first antenna element 16a and the second antenna element 16b, increased by effective electrical length of the first antenna element 16a and the second antenna element 16b effectively, thereby the reduction operating frequency of antenna is expanded bandwidth, is conducive to realize the miniaturization of antenna.On the other hand, because the application of the first floor minor matters 15a and the second floor minor matters 15b, the excitation port of the first antenna element 16a and the second antenna element 16b can be arranged on the edge of substrate 11, the path along floor surface has just been increased widely between the two-port like this, thereby the isolation between two antenna elements has obtained the improvement of arriving very much.
In order to realize two trap functions, the UWB MIMO antenna that the utility model patent relates to adopts the slit of coupling loop checking installation and terminal open circuit.Substrate 11 back sides are printed with the first metal tape 19a and the second metal tape 19b, and the first metal tape 19a and the first antenna element 16a are provided with lap 110a and lap 111a, and lap 110a and lap 111a are referred to as first lap; The second metal tape 19b and the second antenna element 16b are provided with lap 110b and lap 111b, and lap 110b and lap 111b are referred to as second lap.The first metal tape 19a and the first antenna element 16a form the first coupling circular path by first lap, and the second metal tape 19b and the second antenna element 16b form the second coupling circular path by second lap.When the length of the first coupling circular path and the second coupling circular path is 1 wavelength of a certain frequency, near this frequency, will produce the trap effect.This is because the introducing of the first coupling circular path of 1 wavelength and the second coupling circular path has destroyed the impedance matching of original antenna, causes very big emission, and then the energy emission of antenna is not gone out, thereby has produced trap function.The first coupling circular path and the second coupling circular path are very little to the influence of the operating frequency beyond the trap frequency range, and the change of the width of the first metal tape 19a and the second metal tape 19b can be controlled the frequency domain position of trap frequency range effectively.
The related UWB MIMO antenna of the utility model also embeds the first terminal open circuit slit 112a and the second terminal open circuit slit 112b respectively on the first antenna element 16a and the second antenna element 16b.When the length of the first terminal open circuit slit 112a and the second terminal open circuit slit 112b is 1/4 wavelength of some frequencies, near this frequency, produce the trap effect in the frequency domain.This also is because the introducing of the first terminal open circuit slit 112a and the second terminal open circuit slit 112b, makes the antenna match variation, and most energy is reflected back, thereby obtains the trap effect.The first terminal open circuit slit 112a and the second terminal open circuit slit 112b are very little to the effect that the working band beyond the trap frequency range of its generation produces, change the length of the first terminal open circuit slit 112a and the second terminal open circuit slit 112b, can control the frequency domain position of trap frequency band effectively.
Fig. 4 (a) is the two trap UWB MIMO antenna structures of the small-sized high-isolation that the utility model proposes, it has comprised the first antenna element 16a, the second antenna 16b, the first excitation port 17a, the second excitation port 17b, 50 ohm the first microstrip line 18a, 50 ohm the second microstrip line 18b, the first metal tape 19a, the second metal tape 19b, the first terminal open circuit slit 112a, the second terminal open circuit slit 112b, rectangle floor 14, the first floor minor matters 15a, the second floor minor matters 15b are with the tri-metallic strip 113 that is connected two floor minor matters.Two antenna elements and two 50 ohm microstrip are printed on FR4 substrate front side 12, two strip metal bands, system master floor, two floor minor matters and are printed on FR4 substrate back 13 with the tri-metallic strip 113 that is connected two floor minor matters.The first antenna element 16a carries out feed by 50 ohm the first microstrip line 18a by the first excitation port 17a; The second antenna element 16b carries out feed by 50 ohm the second microstrip line 18b by the second excitation port 17b.The first antenna element 16a and the second antenna element 16b are placed on two corners of substrate 11 symmetrically, because the first floor minor matters 15a, the application of the second floor minor matters 15b, so first excitation port 17a of two antenna elements, the second excitation port 17b can be placed on the top edge of substrate 11, the path along floor surface between such two antenna elements just is lengthened out, be conducive to reducing of mutual coupling between antenna element, the while first floor minor matters 15a, the second floor minor matters 15b can also think the first antenna element 16a, the part of the second antenna element 16b participates in radiation, increase effective cascade unit of antenna element, thereby reduction operating frequency of antenna, improve impedance bandwidth, reduce the size of antenna element.The introducing of tri-metallic strip 113 is in order to introduce an extra coupling path, thereby further reduces the coupling between first antenna element and second antenna element.
Come as can be seen from Fig. 1 (c), the feed port of two antenna elements is placed on substrate 11 top edges, make the utility model not need to adopt any decoupling-structure, just can obtain good impedance bandwidth and isolation.Comparison diagram 1(b) and the Electromagnetic Simulation curve chart 1(c of the frequency response of MIMO antenna shown in Fig. 2 (a)) and Fig. 2 (b), can clearly observe because the application of the first metal tape 19a, the second metal 19b has produced two circular paths, then produced a trap frequency range in bandwidth, the frequency domain position of the operating frequency of this frequency range can be by the width w of the first metal tape 19a, the second metal tape 19b
sControl, and the application of this circular path is very little to the influence of the extraneous working band of trap.Electromagnetic Simulation curve chart 1(c from the frequency response of antenna shown in Fig. 1 (b) and Fig. 3 (a)) and the comparison of Fig. 3 (b), the effect of terminal open circuit slit 112a, 112b can well be understood.Can observe from Fig. 3 (b), for the antenna shown in Fig. 1 (b), MIMO antenna shown in Fig. 3 (a), because the existence of the first terminal open circuit slit 112a, the second terminal open circuit slit 12b, in bandwidth of operation, produced a trap frequency band effectively, and the frequency of this trap frequency band can be by changing the length s of the first terminal open circuit slit 112a, the second terminal open circuit slit 112b
lMake.
Because the novel modes of emplacement of antenna element can guarantee under the undersized prerequisite, make the impedance matching of antenna improve, isolation between the antenna element meets the demands, and circular path and terminal open circuit slit are very little to the effect that the working band beyond the trap frequency range of its generation produces; The frequency response chart of antenna shown in comparison diagram 1 (b), Fig. 2 (a), Fig. 3 (a) and Fig. 4 (a), can see, the slit of the antenna element modes of emplacement that the utility model proposes, loop checking installation, terminal open circuit slit and tri-metallic strip 113 combines, then can obtain the two trap UWBMIMO antennas of small-sized high-isolation that the utility model proposes, this antenna structure is simple, size is little, and cost of manufacture is low.
Above-described embodiment is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (7)
1. the two trap UWB MIMO antennas of small-sized high-isolation is characterized in that, comprise the floor, the first floor minor matters, the second floor minor matters, first antenna element and second antenna element that are printed on substrate back; The first floor minor matters and the second floor minor matters symmetry are placed; First antenna element and second antenna element form symmetrical structure, and are placed on two corners of described substrate; The excitation port of the excitation port of first antenna element and second antenna element is placed on described substrate top edge, and the excitation port of first antenna element is connected with the first floor minor matters, and the excitation port of second antenna element is connected with the second floor minor matters.
2. two trap UWB MIMO antennas of small-sized high-isolation according to claim 1, it is characterized in that, the back side of described substrate is printed with first metal tape and second metal tape, the two ends of first metal tape and first antenna element are provided with first lap, and the two ends of second metal tape and second antenna element are provided with second lap; First metal tape and first antenna element form the first coupling circular path by described first lap, and second metal tape and second antenna element form the second coupling circular path by described second lap.
3. the two trap UWB MIMO antennas of small-sized high-isolation according to claim 1 and 2 is characterized in that, also embed the first terminal open circuit slit at described first antenna element, embed the second terminal open circuit slit at described second antenna element.
4. the two trap UWB MIMO antennas of small-sized high-isolation according to claim 1 is characterized in that, are provided with first microstrip line between the excitation port of described first antenna element and first antenna element.
5. the two trap UWB MIMO antennas of small-sized high-isolation according to claim 1 is characterized in that, are provided with second microstrip line between the excitation port of described second antenna element and second antenna element.
6. the two trap UWB MIMO antennas of small-sized high-isolation according to claim 1 is characterized in that, also comprise the tri-metallic strip that connects the first floor minor matters and the second floor minor matters.
7. the two trap UWB MIMO antennas of small-sized high-isolation according to claim 1 is characterized in that described first antenna element is antenna element; Second antenna element is antenna element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652453 CN203166075U (en) | 2012-11-30 | 2012-11-30 | Small high isolation dual notch UWB MIMO antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652453 CN203166075U (en) | 2012-11-30 | 2012-11-30 | Small high isolation dual notch UWB MIMO antenna |
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| Publication Number | Publication Date |
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| CN203166075U true CN203166075U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220652453 Withdrawn - After Issue CN203166075U (en) | 2012-11-30 | 2012-11-30 | Small high isolation dual notch UWB MIMO antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983397A (en) * | 2012-11-30 | 2013-03-20 | 华南理工大学 | Small high-isolation double-notch UWB MIMO antenna |
| CN104505592A (en) * | 2015-01-14 | 2015-04-08 | 华南理工大学 | Multiple input multiple output (MIMO) mobile terminal antenna with wide band characteristics |
| CN104638365A (en) * | 2014-12-25 | 2015-05-20 | 中国电子科技集团公司第七研究所 | Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure |
| CN108767442A (en) * | 2018-05-30 | 2018-11-06 | 杭州电子科技大学 | A kind of MIMO terminal antennas of the wide-band high isolation of no decoupling arrangements |
| RU187412U1 (en) * | 2017-05-08 | 2019-03-05 | Цзянсу Хэнсинь Технолоджи Ко., Лтд | FOUR ELEMENT MIMO ANTENNA WITH VARIOUS POLARIZATION STATES AND DIRECTION DIAGRAMS |
| CN112909526A (en) * | 2021-01-22 | 2021-06-04 | 宁波大学 | Dual-frequency point ultrahigh-frequency bandwidth tagged antenna |
-
2012
- 2012-11-30 CN CN 201220652453 patent/CN203166075U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983397A (en) * | 2012-11-30 | 2013-03-20 | 华南理工大学 | Small high-isolation double-notch UWB MIMO antenna |
| CN104638365A (en) * | 2014-12-25 | 2015-05-20 | 中国电子科技集团公司第七研究所 | Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure |
| CN104505592A (en) * | 2015-01-14 | 2015-04-08 | 华南理工大学 | Multiple input multiple output (MIMO) mobile terminal antenna with wide band characteristics |
| CN104505592B (en) * | 2015-01-14 | 2017-11-07 | 华南理工大学 | A kind of MIMO mobile terminal antennas with broadband character |
| RU187412U1 (en) * | 2017-05-08 | 2019-03-05 | Цзянсу Хэнсинь Технолоджи Ко., Лтд | FOUR ELEMENT MIMO ANTENNA WITH VARIOUS POLARIZATION STATES AND DIRECTION DIAGRAMS |
| CN108767442A (en) * | 2018-05-30 | 2018-11-06 | 杭州电子科技大学 | A kind of MIMO terminal antennas of the wide-band high isolation of no decoupling arrangements |
| CN112909526A (en) * | 2021-01-22 | 2021-06-04 | 宁波大学 | Dual-frequency point ultrahigh-frequency bandwidth tagged antenna |
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Granted publication date: 20130828 Effective date of abandoning: 20150311 |
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