Extremely linear electrically tunable active receiving antenna
Abstract
An analysis of selective active receiving antennas with a single resonant circuit at the input of the amplifier is presented. Attention is given to field strength sensitivity, the required antenna height, and the enhancement of the dynamic characteristics. The optimum arrangement of two resonant circuits in selective active antennas is examined theoretically, with comparisons made of a reactive coupled two resonant circuit at the amplifier input and the second circuit as negative feedback circuitry within the amplifier. The second resonant circuit is installed to assure a sufficient dynamic range. Nonlinear effects in the amplifier are discussed, as are nonlinear distortions and frequency pulling when premagnetized ferrite coils are employed to tune the resonant circuits. An antenna which covers the short wave frequency range from 1-30 MHz is described.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf...75H
- Keywords:
-
- Electric Field Strength;
- Frequency Control;
- Radio Antennas;
- Radio Reception;
- Resonant Frequencies;
- Tuning;
- Coupling Circuits;
- Frequency Pulling;
- Inductance;
- Phase Locked Systems;
- Rlc Circuits;
- Sensitivity;
- Transmission Efficiency;
- Electronics and Electrical Engineering