A TROPOSPHERIC RADIO RELAY COMMUNICATION ANTENNA,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Most commonly employed abroad as trophospheric radio relay communication antennas in the band of approximately 30 cm are antennas with an axiosymmetrical parabolic reflector. The parabolic antenna with remote primary radiating element exciter which has been developed in our country offers a number of advantages over the axio-symmetrical antenna. In the asymmetrically excited antenna there is practically no mirror reaction associated with the propagation, in the transmission line, of an electromagnetic wave reflected by the parabolic reflector and received by the exciter. By locating the radiating element and its securing structures at the focal point of the axio-symmetrical reflector, a portion of the antennas aperture surface is shaded. This leads to some decreases in the energy radiated toward the correspondent and to an increase in side lobe levels. Along with its better electrical parameters, the antenna with asymmetrical reflector illumination provides for location of exciter and transmission lines on the surface of the ground, thus facilitating installation, adjustment and operation. An additional important advantage is the oblique disposition of the reflectors working surface with respect to the ground. This rules out any possibility of snow or frost accumulations and eliminates the need for any screening of the antenna.
- Radio Communications