Transistorized receiving antennas
Abstract
It is shown that optimum linearity of a receiving system with an omnidirectional antenna can be obtained only if the antenna size is not greater than that required by the sensitivity of the system. This results in an optimum antenna length that depends on the external antenna temperature. Using an appropriate antenna amplifier with extremely high reverse feedback factor, nonlinear effects arising from the nonlinearity of amplifier elements can be suppressed to such an extent that active broadband antennas with very wide dynamic range can be realized. The best location for the antenna amplifier within a vertical antenna structure is evaluated. It is found that the linearity of an active antenna operating broadband at the amplifier input can be improved considerably by means of a selective reverse feedback at the amplifier output.
- Publication:
-
International Symposium on Electromagnetic Waves
- Pub Date:
- 1981
- Bibcode:
- 1981emw..symp..423L
- Keywords:
-
- Antenna Design;
- Feedback Amplifiers;
- Omnidirectional Antennas;
- Performance Prediction;
- Radio Reception;
- Transistor Amplifiers;
- Amplifier Design;
- Broadband Amplifiers;
- Equivalent Circuits;
- Negative Feedback;
- Nonlinearity;
- Signal Distortion;
- Signal To Noise Ratios;
- Communications and Radar