38results about How to "Low cross-polarization level" patented technology

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.

The invention discloses a circularly polarized differential dielectric resonator array antenna for use in the field of wireless communication. The circularly polarized differential dielectric resonator array antenna comprises a feed structure and four radiating elements. The radiating elements are differential feed circularly polarized rectangular dielectric resonators. The four radiating elements are successively rotated by 0 degree, 90 degrees, 180 degrees and 270 degrees around the center of the array. The feed structure is a parallel sequential rotation feed network and has the same element feed phase and element rotation angle. The array antenna has an impedance bandwidth of 12.1% (25.5 GHz to 28.8 GHz) and a 3dB axial ratio bandwidth of 11.1% (25.95 GHz to 29 GHz). The principal polarization of the array antenna is left-handed circular polarization, and the cross-polarization of the array antenna is right-handed circular polarization. The cross-polarization level on both radiating surfaces can reach below -15dB in a 3dB beam bandwidth. The antenna of the invention has good circular polarization characteristics, a low cross-polarization level, and can be directly integrated with an RF front-end differential circuit because of its differential feed characteristics.

The invention discloses a broadband cavity-backed planar slot array antenna based on a dielectric integrated waveguide, and belongs to the technical field of antennas. The antenna is composed of a radiation structure and a feed structure. The radiation structure is composed of two or four radiation units, and each radiation unit achieves radiation of electromagnetic waves by forming slot grooves in an upper-layer metal plate of a dielectric integrated waveguide. And the feed structure adopts an equal-amplitude same-phase microstrip line power divider. In order to improve the impedance bandwidth and the radiation gain, the radiation unit is provided with a left-right symmetrical V-shaped slot and an inverted V-shaped slot. The working frequency of the antenna provided by the invention is 9.0 GHz. The relative bandwidth of the 2-unit array antenna is 25.6%, and the gain of the 2-unit array antenna is 10.1 dBi. The relative bandwidth of the 4-unit array antenna is 31.3%, and the gain of the 4-unit array antenna is 12.9 dBi. The antenna has the advantages in performance such as frequency band and gain, and is expected to be widely applied to wireless communication and radar systems.

The present invention discloses a compact broadband omnidirectional vertically polarized antenna. The antenna comprises a top-layer metal radiating sheet, a lower-layer dielectric plate, a middle metal column and a plurality of shorting-circuit metal columns. The lower-layer dielectric plate is provided with a hollow region. An upper end of the middle metal column is connected with the top-layer metal radiating sheet. A lower end of the middle metal column extends towards the hollow region. Upper ends of the shorting-circuit metal columns are connected with the top-layer metal radiating sheet.Lower ends of the shorting-circuit metal columns are connected with an upper surface of the lower-layer dielectric plate. After a microstrip feeder penetrates through the hollow region of the lower-layer dielectric plate, the microstrip feeder is connected with the lower end of the middle metal column. The present application proposes a method for introducing a capacitive reactance load into a floor slit, so that an antenna obtains a new resonant mode, and forms double-resonance operation in combination with a resonant mode obtained by introducing an inductive reactance load into a short-circuit metal bar, so that the antenna obtains good omnidirectional vertically polarized radiation characteristics within a wide range.

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.

The invention discloses a wide-angle scanning dual-polarization dipole antenna, and belongs to the technical field of antennas. The wide-angle scanning dual-polarization dipole antenna comprises a first metal arm, an antenna support column, a second metal arm and a feed balun, wherein the first metal arm is located at the top of the antenna, and is used for improving the impedance fluctuation of the antenna during large-angle scanning; and the feed balun is located at the bottom of the antenna and is used for converting the unbalanced feed input by a coaxial line into a balanced feed. According to the antenna, the impedance matching during large-angle scanning of the antenna is greatly improved, and the antenna wide-angle scanning performance is effectively improved; meanwhile, the antennahas high cross polarization performance; and finally, due to the fact that both the metal dipole arm and the top metal arm adopt longitudinal blade-shaped bending structures, the cross section is small, snow and rain are not prone to being accumulated, the influence of accumulated snow and accumulated rain and the like on the performance and the service life of the antenna is greatly reduced, andthe antenna can be well suitable for severe weather conditions such as strong rainfall, strong snowfall and the like.

The invention discloses a dual-polarization base station antenna based on shared symmetrical array arms, the antenna comprises a dielectric plate, four microstrip feeder wires are printed on the top surface of the dielectric plate, the four microstrip feeder wires are respectively arranged along two diagonal lines of the dielectric plate, four shared array arms are printed on the bottom surface ofthe media plate, the four shared array sub-arms are respectively located at positions opposite to the four microstrip feed wires on the bottom surface of the dielectric plate, a microstrip feed wireand an opposite shared array sub-arm are connected with one end of a coaxial cable, and an antenna reflector plate in the horizontal direction is arranged directly below the dielectric plate. The antenna disclosed by the invention shares one polarized symmetrical array sub-arm with another orthogonally polarized symmetrical array sub-arm, realizes two radiation with different polarizations respectively, can greatly reduce antenna radiator size and antenna profile, and has the advantages of stable frequency bandwidth, gain and wave lobe width, etc.

The feed source of the corrugated horn comprises a harmful harmonic mode suppresser, the corrugation groove mode converter with double-groove structure, the frequency change and angle change transition section with double-groove deep corrugation structure and the radiation section with double-groove deep corrugation structure. The corrugation groove mode converter combines the harmful harmonic suppresser and the annular loading groove as well as the straight groove so as to reach the purpose of restraining excitation of the harmful harmonic mode, lowering reflectino loss and dual-band joint use. The invention possesses the features of rotation symmetry of the radiation pattern in two discrete frequency ranges, low electrical level of the side lobe and cross polarization, low reflection loss and high gain.

The invention discloses a dual-polarized microstrip slot antenna and an electronic product. The dual-polarized microstrip slot antenna comprises a radiation patch, a grounding plate, a first polarized feeder line and a second polarized feeder line, wherein the radiation patch is a main radiator of the antenna, and the size of the radiation patch can be determined according to the center frequency of the antenna; a gap is formed in the grounding plate and is used for gap coupling feeding; the first polarization feeder is located between the radiation patch and the grounding plate and is used for generating electromagnetic coupling with the grounding plate to form excitation and radiating electromagnetic waves to the radiation patch; the second polarization feeder line and the first polarization feeder line are spatially orthogonal and are arranged in a layered manner, the grounding plate is located between the first polarization feeder line and the second polarization feeder line, and the second polarization feeder line radiates electromagnetic waves to the direction of the radiation patch through a gap formed in the grounding plate. According to the invention, a mixed feed technology combining gap feed and proximity coupling feed is adopted, and a structural design of layered arrangement of the polarized feeder lines is matched, so that the bandwidth of the antenna is expanded, and meanwhile, the cross polarization level is reduced.

The invention discloses a dielectric substrate integrated waveguide slot array antenna used for electronic equipment such as wireless communication, radar, electronic navigation and electronic countermeasures. The metal foil on one side is etched with a slot array and a microstrip power divider, the slot array unit is connected to the microstrip power divider, and a through hole is provided on the dielectric substrate board and the metal foil, and the through hole is Metallized through holes, the metallized through holes are arranged in a "U" shape, and the metallized through holes arranged in a "U" shape surround the slot array unit; the present invention has the following advantages: easy to produce, especially easy to mass produce and The manufacturing precision is high and the performance of the antenna can be improved.

The invention discloses a broadband cavity-backed planar slot array antenna based on a dielectric integrated waveguide, which belongs to the technical field of antennas. The antenna is composed of a radiating structure and a feeding structure. The radiating structure is composed of 2 or 4 radiating units, and each radiating unit realizes the radiation of electromagnetic waves by opening slots on the upper metal plate of the dielectric integrated waveguide. The feed structure adopts microstrip line power divider with equal amplitude and same phase. In order to improve the impedance bandwidth and radiation gain, the radiation unit is provided with left-right symmetrical "亣"-shaped slots and inverted "eight"-shaped slots. The operating frequency of the antenna of the present invention is 9.0GHz. The 2-element array antenna achieves a relative bandwidth of 25.6%, and a gain of 10.1dBi. The 4-element array antenna achieves a relative bandwidth of 31.3%, and a gain of 12.9dBi. The invention has advantages in performance such as frequency band and gain, and is expected to be widely used in wireless communication and radar systems.

The invention discloses a broadband substrate integrated waveguide (SIW) back cavity slot antenna array adopting an L-shaped slot unit. The antenna array comprises a parallel feed type power divisionnetwork and a plurality of SIW back cavity slot antenna units, each antenna unit is mainly composed of an SIW rectangular resonant cavity and two pairs of L-shaped slot pairs rotationally symmetricalrelative to the center of the resonant cavity, and two L-shaped slots of each of L-shaped slot pairs are arranged face to face. By designing the positions of metalized through holes and metalized blind holes, each antenna unit forms a rectangular SIW isolation cavity with an open long side in a dielectric bonding layer, and the influence of an electromagnetic field leaked in the bonding layer on an antenna array directional diagram and gain is remarkably reduced. The antenna array realized by the invention has the characteristics of wide directional diagram bandwidth, flat in-band gain, narrowbeams in both an azimuth plane and a pitch plane, and low cross polarization electrical level.

The invention discloses a wide-angle scanning dual-polarization dipole antenna, which belongs to the technical field of antennas and includes a first metal arm, an antenna support column, a second metal arm and a feed balun, and the first metal arm is located at the antenna The top of the antenna is used to improve the impedance fluctuation of the antenna when scanning at a large angle. The feed balun is located at the bottom of the antenna and is used to convert the unbalanced feed of the coaxial line input into a balanced feed. The invention greatly improves the impedance matching when the antenna scans at a large angle, and effectively improves the performance of the wide-angle scan of the antenna; at the same time, the antenna has good cross-polarization performance; finally, since both the metal dipole arm and the top metal arm are made of Longitudinal blade-shaped bending structure, its cross-section is extremely small, it is not easy to accumulate snow and rain, which greatly reduces the impact of snow and rain on the performance and life of the antenna, and can be well applied to heavy rainfall and heavy snowfall, etc. inclement weather conditions.

The invention discloses a linearly polarized monopulse flat panel slot antenna, which belongs to the technical field of antennas. The antenna of the present invention includes a radiating slot feeding layer and a single pulse feeding network. The surface of the single-layer radial waveguide is provided with a radiating slot array, and each circle of the radiating slot array is formed by wrapping a slot around the radial line waveguide. The center of the circle is arranged in a quadrant waveguide according to the slot arrangement rule of the traditional linearly polarized RLSA, and then the slots in the four quadrant waveguides of the same circle are obtained symmetrically from top to bottom, left and right, and the line is realized by controlling the feed network to change the feed phase. polarized and monopulse. The present invention has a simple feeding structure, avoids a huge feeding network structure, has small loss, and has high antenna efficiency. Compared with the traditional linearly polarized RLSA structure, it can not only realize linear polarization, but also realize single pulse, Moreover, the use of a single slit as a linearly polarized radiation unit improves the reflection coefficient, and has a stable radiation pattern, extremely low cross-polarization level, and good return loss in the working frequency band.