CN105514612A - Low-profile dual-band omni-directional antenna - Google Patents
Low-profile dual-band omni-directional antenna Download PDFInfo
- Publication number
- CN105514612A CN105514612A CN201610065508.9A CN201610065508A CN105514612A CN 105514612 A CN105514612 A CN 105514612A CN 201610065508 A CN201610065508 A CN 201610065508A CN 105514612 A CN105514612 A CN 105514612A
- Authority
- CN
- China
- Prior art keywords
- antenna
- radiation
- resonance
- metal
- double frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention discloses a low-profile dual-band omni-directional antenna and is suitable for a wireless communication system. The low-profile dual-band omni-directional antenna comprises a dielectric substrate, a radiation metal patch, resonant metal patches, a metal bottom plate and metal via holes. The resonant metal patches are placed around the radiation metal patch at a certain interval. The metal via holes are connected with the resonant metal patches and the metal bottom plate. The antenna can keep the radiation performance similar to that of a monopole antenna in two work frequency bands, and the profile height is only 2% of a wavelength. The antenna has the advantages that the work frequency bands are wide, a profile is low, the structure is simple, performance is stable, and batch production is achieved.
Description
Technical field
The present invention relates to a kind of microstrip antenna, especially there is the double frequency-band omnidirectional antenna of low section characteristic, be widely used in the wireless communication systems such as mobile communication, satellite communication, radar, be particularly suitable for needing multiband operation, quorum sensing inhibitor on 360 ° of directions, and to the application scenario that antenna section is strict with.
Background technology
At present, the antenna of omnidirectional radiation widely uses in a wireless communication system.In the indoor distributed system of mobile communication, widely use monopole antenna to cover, this is because monopole antenna has horizontal plane omnidirectional radiation, the feature that vertical plane taper covers, is very beneficial for the covering of signal.But the structure of monopole antenna adopts to be had quarter-wave conductor to form perpendicular to the vertical of ground or conductive plane erection.Therefore, this antenna is when shortwave frequency range is applied, and its section is too high, easily exposes; Even if in mobile communication system, because travelling carriage needs compact, ultrathin design, this antenna also cannot reach design needs.
Mobile communication has entered fast development period, and the moving communicating field known from people just has 2G (GSM, CDMA, PCS) communication system, 3G (TD-SCDMA, WCDMA, CDMA2000) communication system and 4G (TD-LTE) communication system etc.; And in wireless coverage, also there is WLAN, bluetooth, wireless charging, the wireless communication system of WiFi etc. various criterion.Because different communication standards delimited different communications bands, therefore, cause the huge waste of antenna site resource.Different communication systems all needs the antenna with oneself, to provide quality services and information interchange to client.In order to save the site resource of antenna, the thinking of colocation site be suggested and advocate by national communication authorities.And as radio communication antenna foremost, then can by the mode adopting multiband or all channel antenna to replace original one-band antenna, realize the fusion of network technology, thus solve site scarcity of resources, effectively improve the most effective method of communication network quality.
The basis of original antenna increases extra resonant element, thus realizes antenna and can be operated in multiple frequency range, realize the fusion of Multi net voting.And this adds the size of original antenna to a certain extent, and make the complicated integral structure of antenna, be unfavorable for very much the height of the overall section of control antenna, cause the generation of the problems such as the application scenarios of this antenna is limited.The low section directional antenna utilizing micro-band forms to realize, generally its operating frequency is narrower, cannot meet the demand of practical application.And the antenna of this mode, because being subject to the reason of backside reflection plate, traditional design method cannot realize the homogeneous signal covering of 360 °, can only realize directed radiation.
Summary of the invention
In order to the section overcoming traditional monopole sub antenna is too high and realize the object of multiband work, the invention provides a kind of structure simple, the low section double frequency-band omnidirectional antenna that feed is succinct.
The technical solution adopted for the present invention to solve the technical problems is: described low section double frequency-band omnidirectional antenna, comprise a medium substrate, a metal base plate being printed on medium substrate side, the radiation metal paster being printed on medium substrate opposite side and at least three the mushroom-shaped resonant element structures be centered around around it; Each mushroom-shaped cellular construction is made up of mode of resonance metal patch and at least one metallic vias, and wherein mushroom-shaped being fans annular; Described metallic vias is by medium substrate connection metal base plate and mode of resonance metal patch; The inner core of coaxial cable or radio frequency (RF) coaxial connector and outer wall, be connected respectively to radiation metal paster and metal base plate, as the feed-in interface of antenna electric magnetostatic wave signal.
Described low section double frequency-band omnidirectional antenna, the outer contour shape of radiation metal paster can be circular or square, or arbitrary shape.
Described low section double frequency-band omnidirectional antenna, its mushroom-shaped cellular construction comprises mode of resonance metal patch and metallic vias; And there is between mushroom-shaped cellular construction and radiation metal paster a gap.
Described low section double frequency-band omnidirectional antenna, has gap between each mushroom-shaped cellular construction and is separated.
In mushroom-shaped cellular construction, the position of metallic vias can adjust according to required resonance frequency, meanwhile, also can adopt multiple metallic vias to realize.As a kind of prioritization scheme of the present invention, metallic vias is positioned at the position at resonance metal paster center.
As another kind of prioritization scheme of the present invention, the shape of radiation metal paster is circular, and its distributing point is positioned at home position.
Change dielectric constant and the substrate thickness of medium substrate, the size of the shape of radiation metal paster and size and mode of resonance metal patch and the position of metallic vias, resonance frequency that sub-wavelength resonance produces and formation can be controlled and be operated in electromagnetic wave under TM02 pattern, thus two working frequency range are regulated.
Radiation metal paster of the present invention adopts circular patch can encourage TM02 pattern, field on φ direction be do not have vicissitudinous.And the combination of circular patch antenna and mushroom-shaped cellular construction, zeroth order resonance characteristic can be produced.Single sector models and equivalent electric circuit are analyzed, the interface of its two sector is equivalent to desirable magnetic wall.The inductance of therefore connecting and electric capacity in parallel, the right hand component primarily of paster determines; And the electric capacity of series connection and inductance in parallel, then introduced by the gap between paster and short circuit through hole respectively.Can be known by composite right/left-handed transmission line theory, this equivalent electric circuit can be supported in a certain characteristic frequency electric wave and have zero propagation constant, i.e. model zeroth order resonance.
Low section double frequency-band omnidirectional antenna of the present invention then has three resonance points.First resonance point is the zeroth order resonance introducing mushroom-shaped structure aft antenna, which forms first job frequency range.Under zeroth order mode of resonance, electric field is unified perpendicular to paster, and this is equivalent to the magnetic flux loop along round edge circle.Therefore it can produce omnidirectional radiation directional diagram in the horizontal plane.Second and the 3rd the mode of resonance of resonance point be all TM02 pattern, the annulus that they are made up of circular patch and mushroom-shaped structure respectively produced.The two intercouples, and defines second working band.
The invention has the beneficial effects as follows, the overall section height of antenna is 0.02 λ, far below 0.25 λ of routine.Simultaneously antenna can be operated in two frequency ranges, and all has the antenna pattern of similar monopole antenna simultaneously, and namely have one darker zero at elevation radiation patytern and fall into, horizontal radiation pattern then remains the characteristic of omnidirectional radiation.
Accompanying drawing explanation
Fig. 1 is low section double frequency-band omnidirectional antenna general structure schematic diagram of the present invention.
Fig. 2 is low section double frequency-band omnidirectional antenna patch layer structural representation of the present invention.
Fig. 3 is low section double frequency-band omnidirectional antenna end view of the present invention.
Fig. 4 is the structural representation of single sector in Fig. 1.
Fig. 5 is the equivalent circuit diagram of structure in Fig. 4.
Fig. 6 is low section double frequency-band omnidirectional antenna scattering parameter figure of the present invention.
Fig. 7 is low section double frequency-band omnidirectional antenna E surface radiation directional diagram of the present invention.
Fig. 8 is low section double frequency-band omnidirectional antenna H surface radiation directional diagram of the present invention.
Fig. 9 is low section double frequency-band omnidirectional antenna gain diagram of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Low section double frequency-band omnidirectional antenna of the present invention, is made up of medium substrate (1), metal base plate (2), radiation metal paster (3), mode of resonance metal patch (5) and metallic vias (6).
Radiation metal paster (3) and mode of resonance metal patch (5) are positioned at the same side of medium substrate (1), and they and metal base plate (2) are printed on the both sides of medium substrate (1) respectively.
As a prioritization scheme of embodiments of the invention, the feed placement of antenna is positioned at the center of radiation metal paster, the inner core (7) of coaxial cable (8) or joint is connected with radiation metal paster (3) by via hole (4), and the outer wall of coaxial cable (8) or joint is then connected with metal base plate (2).Signal just can be fed into the radiation metal paster (3) of antenna by outside.
Fig. 2 is the patch layer structural representation of the embodiment of the present invention.In the present embodiment, radiation metal paster (3) is circular.And in other different occasions, its appearance profile can be triangle, quadrangle or polygon.Meanwhile, can slot in radiation metal paster (3) inside.
The shape of resonance metal paster (5) can do corresponding change along with the shape of radiation metal paster (3).Resonance metal paster (5) around radiation metal paster (3) arrangement, and maintains a certain distance with radiation metal paster (3), does not directly contact.And between resonance metal paster (5), there is certain gap.
Metallic vias (6) is through medium substrate (1), and two ends are connection metal base plate (2) and resonance metal patch (5) respectively.As the further prioritization scheme of the embodiment of the present invention, metallic vias (6) is positioned at the center of resonance metal paster (5).
Fig. 4 is the structural representation of single sector in Fig. 1.When zeroth order resonance, radiation metal paster (31) can be equivalent to the inductance of series connection and electric capacity in parallel.Gap between radiation metal paster (31) with resonance metal paster (51) can be equivalent to the electric capacity of connecting, and metallic vias (61) can be equivalent to inductance in parallel.Single sector metal base plate (21) is electric wall, and the dielectric boundaries one (71) of single sector and dielectric boundaries two (72) can be equivalent to desirable magnetic wall, and the electromagnetic wave in sector is by feed port (41) feed-in.Fig. 5 depicts the equivalent circuit diagram of single sector strucre, wherein L
r, C
rbe equivalent to when zeroth order resonance respectively, radiation metal paster (31) is equivalent to the inductance of series connection and electric capacity in parallel; C
lthe gap be equivalent between radiation metal paster (31) with resonance metal paster (51) is equivalent to the electric capacity of connecting, R
lbe equivalent to metallic vias (61) and be equivalent to inductance in parallel.
Low section double frequency-band omnidirectional antenna of the present invention, medium substrate can adopt various dielectric, also can be air dielectric.The thickness of medium substrate can regulate, as required generally between 0.3mm ~ 5mm.
As a prioritization scheme of the present invention, feed port place adopts the characteristic impedance of 50 Ω to carry out feed.
As a specific embodiment of the present invention, medium substrate (1) is of a size of Φ 84mm × 1.5mm, and radiation metal paster is of a size of Φ 41mm.Distance between resonance metal paster and radiation metal paster is generally between 0.1mm ~ 3mm; And the spacing of adjacent resonance metal paster is generally within 0.1mm ~ 4mm scope.
Fig. 6 is the scattering parameter figure of the specific embodiment of the invention.Its abscissa is frequency (GHz), and ordinate is decibel value (dB).This antenna can on 3.995 ~ 4.025GHz and 4.94 ~ 6.06GHz frequency range S11<-10dB, thus antenna can dual band operation.
Fig. 7 is the E surface radiation directional diagram of the specific embodiment of the invention at three resonance frequencies 4.01GHz, 5.24GHz and 5.94GHz.E surface radiation directional diagram under each frequency all presents conical by its shape, and broadside have a >20dB zero fall into.
Fig. 8 is the H surface radiation directional diagram of the specific embodiment of the invention at three resonance frequencies 4.01GHz, 5.24GHz and 5.94GHz.H surface radiation directional diagram under each frequency all presents circle, i.e. horizontal plane omnidirectional radiation.
Fig. 9 is the gain diagram of the specific embodiment of the invention.Antenna is in the gain of first job frequency range at about 5.1dBi, and antenna is 5.8dBi to 8dBi in the gain variation range of second working frequency range.
As specific embodiments of the invention, under antenna can be operated in zeroth order mode of resonance and TM02 pattern.Its relative bandwidth of operation is respectively 0.75% and 20%.
As specific embodiments of the invention, antenna can produce the annular magnetic current of equivalence, thus greatly reduces the overall section height of antenna.The overall section height of this antenna is 0.02 λ, far below 0.25 λ of routine.
Low section double frequency-band omnidirectional antenna of the present invention can be used in the transmission of multi wireless communication system signal, can be applied in the in-door covering of mobile communication system, also can with other integration of equipments to together with, also can be suitable for other similar applications.Antenna structure of the present invention is simple, easily processes, and stable performance, be beneficial to batch production.
Low section double frequency-band omnidirectional antenna described above; only provide as preferably example; be not limited to the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. low section double frequency-band omnidirectional antenna, it is characterized in that comprising medium substrate, be printed on the metal base plate of medium substrate side, the radiation metal paster being printed on medium substrate opposite side and at least three the mushroom-shaped resonant element structures be centered around around radiation metal paster; Each mushroom-shaped cellular construction is formed primarily of mode of resonance metal patch and at least one metallic vias; Described metallic vias is by medium substrate connection metal base plate and mode of resonance metal patch;
Described radiation metal paster is connected with feed heart yearn, and described metal base plate is connected with feed outer wall.
2. low section double frequency-band omnidirectional antenna as claimed in claim 1, is characterized in that: described its outline of radiation metal paster can be circle, triangle, quadrangle or polygon.
3. low section double frequency-band omnidirectional antenna as claimed in claim 2, is characterized in that: the shape of radiation metal paster is for circular, and its distributing point is positioned at home position.
4. low section double frequency-band omnidirectional antenna as claimed in claim 1, is characterized in that: described resonance metal paster around radiation metal patch, and maintains a certain distance with radiation metal paster; Maintain a certain distance between described adjacent resonance metal paster.
5. low section double frequency-band omnidirectional antenna as claimed in claim 1, is characterized in that: described medium substrate is the medium such as conventional dielectric or air.
6. low section double frequency-band omnidirectional antenna as claimed in claim 1, is characterized in that: described feed heart yearn is metal coaxial cable or coaxial fitting.
7. low section double frequency-band omnidirectional antenna as claimed in claim 6, is characterized in that: described feeder cable or the characteristic impedance of coaxial fitting are 50 Ω.
8. low section double frequency-band omnidirectional antenna as claimed in claim 1, is characterized in that: the overall section height of antenna is 0.02 λ.
9. low section double frequency-band omnidirectional antenna as claimed in claim 3, is characterized in that: radiation metal paster adopt circular patch can encourage TM02 pattern, field on φ direction be do not have vicissitudinous; The combination of circular patch antenna and mushroom-shaped resonant element structure, produces zeroth order resonance characteristic.
10. low section double frequency-band omnidirectional antenna as claimed in claim 7, is characterized in that: described low section double frequency-band omnidirectional antenna has three resonance points, two working frequency range:
First resonance point is the zeroth order resonance introducing mushroom-shaped resonant element structure aft antenna, form first job frequency range, due under zeroth order mode of resonance, electric field is unified perpendicular to paster, be equivalent to the magnetic flux loop along round edge circle, therefore produce omnidirectional radiation directional diagram in the horizontal plane;
Second and the 3rd the mode of resonance of resonance point be all TM02 pattern, they are made up of radiation metal paster and mushroom-shaped resonant element structure respectively, and the two intercouples, and form second working band; Have one darker zero at elevation radiation patytern to fall into, horizontal radiation pattern then remains the characteristic of omnidirectional radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065508.9A CN105514612A (en) | 2016-01-29 | 2016-01-29 | Low-profile dual-band omni-directional antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065508.9A CN105514612A (en) | 2016-01-29 | 2016-01-29 | Low-profile dual-band omni-directional antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105514612A true CN105514612A (en) | 2016-04-20 |
Family
ID=55722404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610065508.9A Pending CN105514612A (en) | 2016-01-29 | 2016-01-29 | Low-profile dual-band omni-directional antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105514612A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963397A (en) * | 2018-07-26 | 2018-12-07 | 中国计量大学 | Fan shape bandpass filter |
| CN109742540A (en) * | 2019-02-26 | 2019-05-10 | 山西大学 | A kind of miniaturization high-isolation multi-source multibeam antenna |
| CN110233360A (en) * | 2019-04-23 | 2019-09-13 | 中天宽带技术有限公司 | A kind of dual-band antenna and electronic equipment |
| CN111181493A (en) * | 2019-11-26 | 2020-05-19 | 杭州电子科技大学 | Millimeter wave dual-band dual-mode mixer |
| CN111864395A (en) * | 2020-08-21 | 2020-10-30 | 西安电子科技大学 | Low-profile broadband omnidirectional filtering antenna applied to unmanned aerial vehicle communication |
| CN112803155A (en) * | 2021-04-14 | 2021-05-14 | 成都瑞迪威科技有限公司 | Structure for realizing antenna wide beam and smooth directional diagram in large-size ground |
| CN113097704A (en) * | 2021-03-16 | 2021-07-09 | 华南理工大学 | Low-profile dual-frequency common-caliber monopole antenna based on cross-layer folding structure |
| CN113517566A (en) * | 2021-06-15 | 2021-10-19 | 上海大学 | Small circular or elliptical microstrip patch antenna loaded with fan-shaped mushroom type metamaterial |
| CN114361799A (en) * | 2021-04-21 | 2022-04-15 | 成都频时科技有限公司 | Vertical polarization omnidirectional antenna |
| CN118174031A (en) * | 2024-05-15 | 2024-06-11 | 微网优联科技(成都)有限公司 | Ultralow-profile double-frequency omnidirectional WiFi antenna |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008283381A (en) * | 2007-05-09 | 2008-11-20 | Univ Of Fukui | Antenna device |
-
2016
- 2016-01-29 CN CN201610065508.9A patent/CN105514612A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008283381A (en) * | 2007-05-09 | 2008-11-20 | Univ Of Fukui | Antenna device |
Non-Patent Citations (2)
| Title |
|---|
| CHUEN-DE WANG等: ""bandwidth enhancement based on optimized via location for multiple vias ebg power/ground planes"", 《IEEE TRANSACTIONS ON COMPONENTS, PACKAGING AND MANUFACTURING TECHNOLOGY》 * |
| XI-WANG DAI 等: ""Dual-Band Microstrip Circular Patch Antenna With Monopolar Radiation Pattern"", 《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963397A (en) * | 2018-07-26 | 2018-12-07 | 中国计量大学 | Fan shape bandpass filter |
| CN109742540A (en) * | 2019-02-26 | 2019-05-10 | 山西大学 | A kind of miniaturization high-isolation multi-source multibeam antenna |
| CN110233360A (en) * | 2019-04-23 | 2019-09-13 | 中天宽带技术有限公司 | A kind of dual-band antenna and electronic equipment |
| CN111181493A (en) * | 2019-11-26 | 2020-05-19 | 杭州电子科技大学 | Millimeter wave dual-band dual-mode mixer |
| CN111181493B (en) * | 2019-11-26 | 2023-04-25 | 杭州电子科技大学 | Millimeter wave dual-band dual-mode mixer |
| CN111864395B (en) * | 2020-08-21 | 2022-07-22 | 西安电子科技大学 | Low-profile broadband omnidirectional filtering antenna applied to unmanned aerial vehicle communication |
| CN111864395A (en) * | 2020-08-21 | 2020-10-30 | 西安电子科技大学 | Low-profile broadband omnidirectional filtering antenna applied to unmanned aerial vehicle communication |
| CN113097704A (en) * | 2021-03-16 | 2021-07-09 | 华南理工大学 | Low-profile dual-frequency common-caliber monopole antenna based on cross-layer folding structure |
| CN112803155A (en) * | 2021-04-14 | 2021-05-14 | 成都瑞迪威科技有限公司 | Structure for realizing antenna wide beam and smooth directional diagram in large-size ground |
| CN114361799A (en) * | 2021-04-21 | 2022-04-15 | 成都频时科技有限公司 | Vertical polarization omnidirectional antenna |
| CN114361799B (en) * | 2021-04-21 | 2024-02-13 | 成都频时科技有限公司 | Vertical polarization omnidirectional antenna |
| CN113517566A (en) * | 2021-06-15 | 2021-10-19 | 上海大学 | Small circular or elliptical microstrip patch antenna loaded with fan-shaped mushroom type metamaterial |
| CN118174031A (en) * | 2024-05-15 | 2024-06-11 | 微网优联科技(成都)有限公司 | Ultralow-profile double-frequency omnidirectional WiFi antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105514612A (en) | Low-profile dual-band omni-directional antenna | |
| CN102723601B (en) | Ultra-wide-band dual-notch paster antenna adopting wide-attenuation-band electromagnetic band gap structure | |
| CN107134637B (en) | Dual-frequency EBG structure and microstrip antenna based on same | |
| CN105680171B (en) | All-around top absorbing antenna with broadband split pole trap characteristic | |
| CN101488604A (en) | Composite fractal antenna comprising two fractals | |
| CN105305055A (en) | Dual-annular planer monopole antenna with ultra-wide band | |
| CN101752665A (en) | UWB (ultra wide band) antenna with band-stop characteristic | |
| CN105529530A (en) | Dual-band low-profile directive antenna | |
| Huang et al. | A novel compact planar triple-band monopole antenna for WLAN/WiMAX applications | |
| Ibrahim | Dual-band microstrip antenna for the fifth generation indoor/outdoor wireless applications | |
| CN103022702A (en) | Broadband cavity-backed multi-slot micro-strip antenna with low cross-polarization characteristic | |
| CN102832451B (en) | The miniaturized gain controllable directional antenna of a kind of broadband and manufacture method thereof | |
| WO2019223318A1 (en) | Indoor base station and pifa antenna thereof | |
| Arya et al. | On the size reduction of microstrip antenna with DGS | |
| CN205248439U (en) | Two ring shape plane monopole antenna of ultra wide band | |
| CN203644954U (en) | Dual-polarized ceiling antenna | |
| US20170365927A1 (en) | Square shaped multi-slotted 2.45ghz wearable antenna | |
| CN205231238U (en) | Vehicle positioning system and basic station unit | |
| CN103401068B (en) | High-gain wideband stereoscopic slot Yagi antenna | |
| CN103022703A (en) | Broadband cavity-backed double-slot microstrip antenna | |
| CN103346386B (en) | Omnibearing broadband form attaching antenna for plane communication | |
| CN102280702A (en) | Very broadband multiterminal feed printing one pole antenna | |
| CN109149087B (en) | Low-profile high-gain ultra-wideband antenna | |
| CN104882670B (en) | Symmetrical quadripole regulates and controls the multiband aerial of slot-coupled resonator | |
| CN109802225B (en) | Microstrip filter antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160420 |