CN105703063A - Left-handed and right-handed circular polarization short backfire antenna - Google Patents
Left-handed and right-handed circular polarization short backfire antenna Download PDFInfo
- Publication number
- CN105703063A CN105703063A CN201610252186.9A CN201610252186A CN105703063A CN 105703063 A CN105703063 A CN 105703063A CN 201610252186 A CN201610252186 A CN 201610252186A CN 105703063 A CN105703063 A CN 105703063A
- Authority
- CN
- China
- Prior art keywords
- pair
- circular polarization
- oscillator
- handed
- short backfire
- 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.)
- Granted
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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
- H01Q19/185—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces wherein the surfaces are plane
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides a left-handed and right-handed circular polarization short backfire antenna. The left-handed and right-handed circular polarization short backfire antenna comprises a disc-like antenna bottom plate; one surface of the disc-like antenna bottom plate is set to a main reflecting surface; a feed network composed of a polarization electric bridge, a cavity filter and a low-noise amplifier is arranged on the other surface of the antenna bottom plate; an auxiliary reflecting surface opposite to the main reflecting surface is fixed in the centre of the main reflecting surface through a centre column extending in the axial direction; the area of the auxiliary reflecting surface is less than that of the main reflecting surface; and furthermore, the interval between the auxiliary reflecting surface and the main reflecting surface is the integral multiple of the predetermined electromagnetic wave half-wavelength. The left-handed and right-handed circular polarization short backfire antenna disclosed by the invention also has the advantages of being concise in construction, compact in structure, convenient to adjust and control phases and the like; the left-handed and right-handed circular polarization short backfire antenna is very suitable for receiving and sending a S-band radio-frequency signal in a telemetry ground station, and converting linearly polarized wave into two left-handed and right-handed circular polarization signals; and thus, normal demodulation processing of a telemetry baseband board card can be ensured.
Description
Technical field
The present invention relates to a kind of antenna, especially a kind of left-right-hand circular polarization short backfire antenna, belong to remote sensing observation and control technology field。
Background technology
Short backfire antenna, modified model short backfire antenna, left-right-hand circular polarization short backfire antenna have simple in construction, radiation efficiency is high, be easily obtained the advantages such as circular polarisation, therefore except being used primarily in radio art, outside in the equipment such as remote-control romote-sensing, communication, radar, Aero-Space, land, ships all obtain extensive use。In actual applications, basic short backfire antenna lacks suitable feeding network, is therefore difficulty with the reception of left-right-hand circular polarization ripple。The more length of industry application differs, symmetry two oscillator of 90 ° of phase contrasts is high for the requirement of oscillator length, is difficult to accurately realize 90 ° of phase contrasts, so backfire antenna is linear polarity format mostly in debugging process。And this kind of form polarization rotation very easily occurs in transmission environment and cause decay, especially cannot realizing the work of left and right hand circular polarization, therefore basic short backfire antenna is not suitable for the occasion that Antenna Anti-jamming and anti-misty rain Capability Requirement is higher simultaneously。
Retrieval finds, application number be 200710176520.8 patent of invention disclose a kind of circular polarisation short backfire antenna with helix feed, although this invention uses helical antenna and feed point deployment device to achieve broadband and the circular polarisation of antenna, but being only capable of realizing a kind of circularly polarised wave to receive, feed system is excessively simple, cannot realize dual polarization ripple receives。
The patent of invention that application number is 200910091652.X and 201010129681.3 individually discloses the low-sidelobe horn antennas of a kind of micro-strip excitation and a kind of double-circle polarization broad-band antenna radiating element for large-angle scanning phased array。These two inventions are not not belonging to proper short backfire antenna, the former adopts micro-strip excitation to radiate on feed, achieve the integration of electromagnetic horn and circular polarization feed, although introducing feeding network in electromagnetic horn, but need to rely on associated microstrip radiating element to realize two feed point port input signal phase differences 90 °, and associated microstrip radiating element is once make, it is difficult to regulate 90 ° of phase contrasts。Radiating element is applied in large-angle scanning phased array by the latter, realizes dual polarization by feed, it is desirable to two input ports are symmetrical structure, it is achieved mode technical sophistication, it is difficult to be applied to short backfire antenna。
Summary of the invention
It is an object of the invention to: the subject matter existed for above-mentioned prior art, it is proposed to a kind of gain is higher, regulation and control are convenient, the left-right-hand circular polarization short backfire antenna of compact conformation, thus conscientiously meeting the anti-interference occasion waiting performance requirement higher。
In order to reach object above, the left-right-hand circular polarization short backfire antenna of the present invention, the plate-like Antenna baseplate of primary reflection surface it is set to including one side, it is characterised in that: the another side of described Antenna baseplate disposes and includes the feeding network that polarization electric bridge, cavity body filter and low-noise amplifier are constituted；The central authorities of described primary reflection surface by the fixing subreflector relative with primary reflection surface of axially extended center pillar, the area of described subreflector less than primary reflection surface, and with the integral multiple that spacing is electromagnetic wave half-wavelength of primary reflection surface；The ring limit secured about of described primary reflection surface；Described center pillar fixes a pair horizontal dipole radially extended between primary reflection surface and subreflector and vertical a pair oscillator；The pair of horizontal dipole and vertical a pair oscillator are respectively coupled to 0 degree and 90 degree of input ports of described polarization electric bridge, and the left and right outfan of described polarization electric bridge exports left and right hand circular polarization signal respectively through cavity body filter and low-noise amplifier。
The technical scheme that the present invention limits further as:
Further, a pair horizontal dipole, vertical a pair oscillator length sum be (0.46-0.50) λ, and the distributing point interval between the pair of horizontal dipole and between vertical a pair oscillator is S=(0.02-0.05) λ；Wherein: λ is electromagnetic wavelength。
Further, described cavity body filter includes the first cavity body filter, the second cavity body filter, described low-noise amplifier includes the first low-noise amplifier and the second low-noise amplifier, one of two constant amplitudes and the signal with 90 ° of phase contrasts that described polarization electric bridge is received by the vertical oscillator of the pair of horizontal dipole and a pair are transmitted to the first cavity body filter and the first low-noise amplifier, and another transmits to the second cavity body filter and the second low-noise amplifier。
Further, the diameter of described primary reflection surface is (2.28-2.35) λ, and the height of side ring is (0.47-0.52) λ。
Further, the oscillator last item for fixing the pair of horizontal dipole and vertical a pair oscillator being set on center pillar is also included。
Further, described oscillator last item divides and includes left and right two parts, every portions end offers cross half notch respectively, and the pair of horizontal dipole and vertical a pair oscillator are respectively placed in wherein after half notch, and the notch of another part is merged clamping and fixed by connector with it。
Further, the end of the pair of horizontal dipole and vertical a pair oscillator all offers the semicircle orifice that radius is 0.5mm-1mm。
Further, the scolding tin together with welding with bonding wire it is filled with in described semicircle aperture。
Further, also include being fixedly mounted on primary reflection surface for protecting the glass fibre reinforced plastic cover of oscillator。
Further, the circular aluminium flake that described subreflector adopts diameter to be (0.48-0.5) λ。
Further, described polarization electric bridge is 3dB electric bridge, operating frequency 2.0GHz-4.0GHz。
The present invention is using the level of decussation and vertical oscillator as feed, vibrate in multiple reflections process back and forth between electromagnetic wave primary reflection surface and subreflector in side ring, due to the integral multiple that the distance between two reflectings surface is predetermined electromagnetic wave half-wavelength, therefore directed radiated energy then becomes stationary field distribution vertically, stray energy then surmounts subreflector to external radiation (it is believed that subreflector serves guiding function), the each main composition part reasonable combination of the result present invention defines Lou chamber resonator, make its directed radiated energy strengthen and stray energy weakens, therefore acquisition higher gain and relatively low sidelobe。In addition, compared with prior art, the present invention also has the advantages such as composition is succinct, the regulation and control of compact conformation, phase place are convenient, it is very suitable in telemetry ground station S-band rf signal reception and transmission, and line polarization wave is converted to left-right rotary two-way circularly polarized signal, to ensure the normal demodulation process of remote measurement baseband board card。
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated。
Fig. 1 is the structural representation of one embodiment of the invention。
Fig. 2 is the side view of Fig. 1。
The schematic diagram of the feeding network in Fig. 3。
It Fig. 4 is the left half structural representation of oscillator last item of the present invention。
Fig. 5 is oscillator and bonding wire structure schematic diagram thereof。
Fig. 6 is the structural representation of oscillator。
Detailed description of the invention
Embodiment one
The left-right-hand circular polarization short backfire antenna of the present embodiment, as shown in Figure 1: include one side and be set to the plate-like Antenna baseplate of primary reflection surface 1, the another side of Antenna baseplate disposes and includes the feeding network that polarization electric bridge 7, cavity body filter 8 and low-noise amplifier 9 are constituted；As shown in Figure 2: the central authorities of primary reflection surface 1 by the fixing subreflector 4 relative with primary reflection surface 1 of axially extended center pillar 5, the area of subreflector 4 less than primary reflection surface 1, and with the integral multiple that the spacing of primary reflection surface 1 is predetermined electromagnetic wave half-wavelength；The ring limit 6 secured about of primary reflection surface 1；Center pillar 5 fixes a pair horizontal dipole radially extended between primary reflection surface and subreflector and vertical a pair oscillator 2；A pair horizontal dipole and vertical a pair oscillator are respectively coupled to 0 degree and 90 degree of input ports of polarization electric bridge 7, and the left and right outfan of the electric bridge 7 that polarizes exports left and right hand circular polarization signal respectively through cavity body filter 8 and low-noise amplifier 9。
The total length of a pair horizontal dipole and vertical a pair oscillator respectively 0.48 λ, and the distributing point interval between a pair horizontal dipole, between vertical a pair oscillator is S=0.03 λ；Wherein: λ is electromagnetic wavelength；Element spacing (distributing point interval S) can be adjusted by turning oscillator。The diameter of primary reflection surface is 2.3 λ, and the height of side ring is 0.5 λ。Present invention additionally comprises and be fixedly mounted on primary reflection surface 1 for protecting the glass fibre reinforced plastic cover 3 of oscillator for protecting feed。The circular aluminium flake that subreflector 4 adopts diameter to be 0.5 λ。
As shown in Figure 3: feeding network includes polarization electric bridge 7, and polarization electric bridge is four port network, and its characteristic is two inputs, two outputs, and two input respectively A, B, then two-port exports respectivelyTwo input ports are mutually isolated, and two output ports divide input power each 50% equally, and phase of output signal differs 90 °。Input port A, B of 0 degree and 90 degree port of described polarization electric bridge 7 is transmitted separately to cavity body filter 8 after being divided into two constant amplitudes and have the signal of 90 ° of phase contrasts by input signal；After described cavity body filter 8 filtering clutter, signal is transmitted separately to low-noise amplifier 9。
Two identical A=B of radiofrequency signal due to input, then be output as left-hand circular polarization ripple and right-handed circular polarization ripple, the method for above employing synthesis realizes the reception of left and right hand circular polarization ripple；Horizontal component and the vertical component amplitude of electric field are equal, phase 90 ° or 270 °, it is possible to obtain circular polarisation。After obtaining the left and right hand circular polarization signal of synthesis, through cavity body filter filtering clutter, mainly filter the signal beyond S-band。Radiofrequency signal is amplified by low-noise amplifier, and two-way exports。
The operating frequency 2.0GHz-4.0GHz of polarization electric bridge 7, here the polarization electric bridge used is 3dB electric bridge, and 3dB electric bridge is also same frequency combiner, is passive device conventional in communication system, it is widely used particularly in radio frequency, microwave circuit and system, adopts Anaren model: 10016-3。It can be determined on direction through-put power continuous sampling along transmission line is a certain, can input signal by one and be divided into two constant amplitudes and have the signal of 90 ° of phase contrasts each other。
Present invention additionally comprises the oscillator last item 10 for fixing a pair horizontal dipole and vertical a pair oscillator being set on center pillar 5。As shown in Figure 4: oscillator last item 10 points includes left and right two parts, every portions end offers cross half notch 10-1 respectively, a pair horizontal dipole and vertical a pair oscillator are respectively placed in wherein after half notch, and the notch of another part is merged clamping and fixed by connector with it。
As shown in Figure 5,6: the end of a pair horizontal dipole and vertical a pair oscillator 2 all offers the semicircle orifice 2-1 that radius is 0.75mm。The scolding tin together with welding it is filled with bonding wire 2-2 in semicircle aperture, not only attractive in appearance but also prevent welding burr from then causing electromagnetic leakage。
The operating frequency 2180MHz of cavity body filter 8～2420MHz, for filtering clutter。
The operating frequency 2200MHz of low-noise amplifier 9-2400MHz, is typically used as high frequency or the intermediate-frequency preamplifier of all kinds of radio receiver and the amplifying circuit of high sensitivity electron detection equipment。In the occasion amplifying small-signal, the interference of signal is likely to very serious by the noise of amplifier self, it is desirable to reduce this noise, to improve the signal to noise ratio of output。
The present invention meets techniques below index: working frequency range: 2200～2400MHz；Gain: >=15dBi；Half-power beam width: >=22 °；First minor level :≤-14dB；Antenna standing wave ratio :≤1.5；Interface shape: SMA seat；Polarization mode: left and right hand circular polarization。
In addition to the implementation, the present invention can also have other embodiments。All employings are equal to replacement or the technical scheme of equivalent transformation formation, all fall within the protection domain of application claims。
Claims (10)
1. left-right-hand circular polarization short backfire antenna, the plate-like Antenna baseplate of primary reflection surface (1) it is set to including one side, it is characterised in that: the another side of described Antenna baseplate disposes and includes the feeding network that polarization electric bridge, cavity body filter and low-noise amplifier are constituted；The central authorities of described primary reflection surface (1) are by the fixing subreflector (4) relative with primary reflection surface (1) of axially extended center pillar (5), the area of described subreflector (4) less than primary reflection surface (1), and with the integral multiple that spacing is electromagnetic wave half-wavelength of primary reflection surface (1)；The ring limit (6) secured about of described primary reflection surface (1)；Described center pillar (5) fixes a pair horizontal dipole radially extended between primary reflection surface and subreflector and vertical a pair oscillator (2)；The pair of horizontal dipole and vertical a pair oscillator are respectively coupled to 0 degree and 90 degree of input ports of described polarization electric bridge, and the left and right outfan of described polarization electric bridge exports left and right hand circular polarization signal respectively through cavity body filter and low-noise amplifier。
2. left-right-hand circular polarization short backfire antenna according to claim 1, it is characterized in that: described cavity body filter includes the first cavity body filter, the second cavity body filter, described low-noise amplifier includes the first low-noise amplifier and the second low-noise amplifier, one of two constant amplitudes and the signal with 90 ° of phase contrasts that described polarization electric bridge is received by the vertical oscillator of the pair of horizontal dipole and a pair are transmitted to the first cavity body filter and the first low-noise amplifier, and another transmits to the second cavity body filter and the second low-noise amplifier。
3. left-right-hand circular polarization short backfire antenna according to claim 1, it is characterized in that: the total length of the total length of a pair horizontal dipole and vertical a pair oscillator is equal, it is (0.46-0.50) λ, and the distributing point interval between the pair of horizontal dipole and between vertical a pair oscillator is S=(0.02-0.05) λ；λ is electromagnetic wavelength。
4. left-right-hand circular polarization short backfire antenna according to claim 3, it is characterised in that: the diameter of described primary reflection surface is (2.28-2.35) λ, and the height of side ring is (0.47-0.52) λ。
5. left-right-hand circular polarization short backfire antenna according to claim 1, it is characterised in that: also include the oscillator last item for fixing the pair of horizontal dipole and vertical a pair oscillator being set on center pillar。
6. left-right-hand circular polarization short backfire antenna according to claim 5, it is characterized in that: described oscillator last item divides and includes left and right two parts, every portions end offers cross half notch respectively, the pair of horizontal dipole and vertical a pair oscillator are respectively placed in wherein after half notch, and the notch of another part is merged clamping and fixed by connector with it。
7. left-right-hand circular polarization short backfire antenna according to claim 6, it is characterised in that: the end of the pair of horizontal dipole and vertical a pair oscillator all offers the semicircle orifice that radius is 0.5-1mm。
8. left-right-hand circular polarization short backfire antenna according to claim 7, it is characterised in that: it is filled with the scolding tin together with welding with bonding wire in described semicircle aperture。
9. the left-right-hand circular polarization short backfire antenna according to any one of claim 1-8, it is characterised in that: also include being fixedly mounted on primary reflection surface for protecting the glass fibre reinforced plastic cover of oscillator。
10. left-right-hand circular polarization short backfire antenna according to claim 9, it is characterised in that: the circular aluminium flake that described subreflector adopts diameter to be (0.48-0.5) λ。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610252186.9A CN105703063B (en) | 2016-04-21 | 2016-04-21 | Left-right-hand circular polarization short backfire antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610252186.9A CN105703063B (en) | 2016-04-21 | 2016-04-21 | Left-right-hand circular polarization short backfire antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105703063A true CN105703063A (en) | 2016-06-22 |
| CN105703063B CN105703063B (en) | 2018-08-31 |
Family
ID=56217288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610252186.9A Expired - Fee Related CN105703063B (en) | 2016-04-21 | 2016-04-21 | Left-right-hand circular polarization short backfire antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105703063B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111130627A (en) * | 2019-12-26 | 2020-05-08 | 中国科学院国家空间科学中心 | Marine phased array satellite communication terminal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170220A (en) * | 2007-10-30 | 2008-04-30 | 北京卫星信息工程研究所 | Dual-frequency band and dual round polarization rear radiation spiral antenna |
| US20120182195A1 (en) * | 2009-07-20 | 2012-07-19 | Monte Thomas D | Multi-feed antenna system for satellite communications |
| CN203192943U (en) * | 2012-12-28 | 2013-09-11 | 中国电子科技集团公司第五十四研究所 | Novel short backfire antenna |
| WO2014035824A1 (en) * | 2012-08-27 | 2014-03-06 | Kvh Industries, Inc. | Antenna system with integrated distributed transceivers |
| CN204596949U (en) * | 2014-10-23 | 2015-08-26 | 西安爱生技术集团公司 | A kind of double resonance circular polarization short backfire antenna |
| CN205646133U (en) * | 2016-04-21 | 2016-10-12 | 航天晨光股份有限公司 | Short backfire antenna of left side right hand circular polarization |
-
2016
- 2016-04-21 CN CN201610252186.9A patent/CN105703063B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170220A (en) * | 2007-10-30 | 2008-04-30 | 北京卫星信息工程研究所 | Dual-frequency band and dual round polarization rear radiation spiral antenna |
| US20120182195A1 (en) * | 2009-07-20 | 2012-07-19 | Monte Thomas D | Multi-feed antenna system for satellite communications |
| WO2014035824A1 (en) * | 2012-08-27 | 2014-03-06 | Kvh Industries, Inc. | Antenna system with integrated distributed transceivers |
| CN203192943U (en) * | 2012-12-28 | 2013-09-11 | 中国电子科技集团公司第五十四研究所 | Novel short backfire antenna |
| CN204596949U (en) * | 2014-10-23 | 2015-08-26 | 西安爱生技术集团公司 | A kind of double resonance circular polarization short backfire antenna |
| CN205646133U (en) * | 2016-04-21 | 2016-10-12 | 航天晨光股份有限公司 | Short backfire antenna of left side right hand circular polarization |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111130627A (en) * | 2019-12-26 | 2020-05-08 | 中国科学院国家空间科学中心 | Marine phased array satellite communication terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105703063B (en) | 2018-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105226400B (en) | Broadband dual-polarization phased array antenna and full-polarization beam forming method | |
| Zhu et al. | Low-profile directional ultra-wideband antenna for see-through-wall imaging applications | |
| CN107895846B (en) | Circular polarization patch antenna with broadband | |
| CN106129593B (en) | A kind of all-metal Phased Array Radar Antenna unit of two dimension wide angle scanning | |
| JP2009200719A (en) | Plane microwave antenna, one-dimensional microwave antenna and two-dimensional microwave antenna array | |
| CN105990681B (en) | Antenna and airborne communication equipment | |
| Li et al. | Design of miniaturized high gain bow-tie antenna | |
| Elsherbini et al. | ENVELOP antenna: a class of very low profile UWB directive antennas for radar and communication diversity applications | |
| CN102916243A (en) | High-gain and small-axial ratio circularly-polarized antenna applied to ultrahigh-frequency RFID (radio frequency identification device) frequency band | |
| CN204243180U (en) | A kind of circular polarized antenna of horizontal omnidirectional radiation | |
| CN205646133U (en) | Short backfire antenna of left side right hand circular polarization | |
| CN105703063A (en) | Left-handed and right-handed circular polarization short backfire antenna | |
| Wiesbeck et al. | Influence of antennas on the radar cross section of camouflaged aircraft | |
| JP2007142974A (en) | Thin planar antenna | |
| CN105742792A (en) | Circular polarized antenna capable of realizing horizontal all-direction radiation | |
| CN109378580A (en) | A kind of double frequency round polarized monopole antenna having wide axial ratio bandwidth | |
| Song et al. | Wideband dual-polarized Vivaldi antenna with improved balun feed | |
| Sun et al. | Broadband, wide beam circularly polarized antenna with a novel matching structure for satellite communications | |
| CN113097745A (en) | Wide-beam parasitic pixel layer antenna for one-dimensional large-angle scanning | |
| Amelia et al. | Microstrip antenna design with dual linear polarizations for X-band weather radar applications | |
| Patel | A dual polarised microstrip antenna with low cross-polarisation, for SAR applications | |
| CN219917582U (en) | inverted-F branch patch antenna | |
| Wei et al. | Method for broadening the beamwidths of crossed dipole for wideband marine GPS applications | |
| Tang et al. | Design of Wideband Filtering Magnetoelectric Dipole Antenna with a Flat Gain utilizing U-shaped Slot | |
| Ahirwar et al. | Broadband dual linear antenna with omni directional coverage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180831 |