80results about How to "Inhibition of cross polarization" patented technology

The invention discloses an X-band marine radar microstrip antenna array. The concrete structure comprises a dielectric substrate, a series-fed microstrip array, a feed network and a metal floor. The series-fed microstrip array is fixedly connected on the upper surface of the dielectric substrate. The metal floor is fixedly connected on the lower surface of the dielectric substrate. The series-fedmicrostrip array comprises a series-fed microstrip subarray I, a series-fed microstrip subarray II, a series-fed microstrip subarray III and a series-fed microstrip subarray which are identical in structure. The series-fed microstrip subarray I comprises a plurality of radiation patches and a plurality of step impedance connection lines. The sidelobe level is reduced, the beam width is optimized and cross polarization is suppressed by adjusting the step impedance connection lines. According to the structure, the step impedance connection lines are used so as to reduce the sidelobe level, optimize the beam width and suppress cross polarization.

The invention discloses a curved surface conformal circular polarization phased array antenna beam synthesis algorithm, which belongs to the technical field of conformal phased array antennas. Including: establishing the global coordinate system of the surface conformal array and the local coordinate system of the antenna unit; obtaining the global coordinates, position vector and polarization vector of each antenna unit; calculating the vector pattern of each antenna unit according to the position vector of the antenna unit and the local pattern of the unit ; The polarization compensation phase of each channel is calculated according to the beam pointing angle and the unit polarization vector; the total field synthesis is performed on the curved surface conformal circularly polarized phased array antenna, and the array pattern is obtained. The present invention synthesizes the optimal polarization by adding polarization compensation phase to each channel, the method is simple, easy to realize, and the calculation speed is fast, especially suitable for circularly polarized conformal phased array antennas, which has a high engineering application prospect and is a good choice for An important improvement over the prior art.

The invention provides an array antenna. The array antenna comprises a reflection plate and a high-frequency resonant unit, a low-frequency resonant unit and C-shaped resonant rings which are arrangedon the reflection plate, wherein the C-shaped resonant rings are arranged at an outer side of the high-frequency resonant ring relative to an axis in a paired way, and openings of the C-shaped resonant rings in the paired way face to each other. The C-shaped resonant rings combined and used in the paired way are used as hidden isolation strips of the array antenna, so that the problem that a conventional isolation means cannot be implemented due to limited internal space is solved, the array element installation space is not occupied, a relatively high isolation effect also can be achieved, and a relatively high suppression effect on cross polarization is achieved. The C-shaped resonant ring hidden isolation strips are electromagnetically coupled between the resonant rings, so that an electromagnetic field among array elements is limited between the C-shaped resonant rings, a propagation passage of the electromagnetic field is changed, the coupling among the array elements is reducedor eliminated; and moreover, since the scattering cross section of each resonant ring is small, the generated cross polarization is far lower that of the conventional means.