Steerable L-band antenna for land mobile voice communication terminal
Abstract
The ESA is developing an EMS (European Mobile System) land mobile voice communication system. Two steerable prototype antennas were developed for an EMS mobile voice communication terminal. The first one is a rotating antenna consisting of two OTA (One Turn Antenna) elements. The feed network generates two separate beams slightly shifted from the boresight. The tracking is based on level difference measurements from these two beams. The mechanical rotation is accomplished by the aid of a step motor. The acquisition and tracking are controlled by a microprocessor. The second antenna is a fully electronic array consisting of 12 OTA elements locating on a circle. The compact feed network gives rise to 24 separate beams in the azimuth plane. The tracking is based on the use of these multiple beams and the performance is enhanced by direction information from a digital compass. The design and performance of both these antennas are described.
- Publication:
-
ESA Special Publication
- Pub Date:
- October 1991
- Bibcode:
- 1991ESASP.332...77A
- Keywords:
-
- Land Mobile Satellite Service;
- Mobile Communication Systems;
- Steerable Antennas;
- Ultrahigh Frequencies;
- Voice Communication;
- Antenna Arrays;
- Antenna Design;
- European Space Agency;
- Microprocessors;
- Communications and Radar