The commonly used parabolic Radar Antenna is mainly composed of two parts: the illuminator, which is operated by some weak directional Radar Antenna, and wants the short symmetrical vibrator Radar Antenna and the horn Radar Antenna. Paraboloid, which generally consists of an aluminum alloy plate with good electrical conductivity, and its thickness is 1.5-3 (mm), or the main paraboloid is made of FRP, and then a metal mesh or metal fence is attached to the inner surface. The maximum value of the mesh is less than λ/8-λ/10. If it is too large, it will cause leakage of electromagnetic waves and affect the normal working performance of Radar Antenna.
Parabolic Radar Antenna
The propagation characteristics of the microwave are similar to those of the light. Therefore, after the electromagnetic wave radiated by the feed source at the focus F is parabolically reflected, the in-phase wavefront is obtained on the paraboloid aperture, so that the electromagnetic wave propagates along the Radar Antenna axis. If the size of the paraboloid is infinite, then the paraboloid changes the spherical wave into an ideal plane wave, and the energy propagates only in the positive direction of the z-axis, and the radiation in other directions is zero. But in fact, the diameter of the paraboloid is limited. At this time, the radiation of Radar Antenna is the diffraction of the electromagnetic wave emitted by the wave source through the aperture surface. It is similar to the diffraction through the small hole in the screen, thus obtaining the size and caliber of the aperture. A narrow-wave beam associated with the field distribution.