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 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 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 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.