A new approach to active antenna design
Abstract
Design considerations for wide-band active antenna circuits for frequencies up to 30 MHz are presented. High performance is obtained by using unusual amplifier types having a virtually grounded input electrode of the input active device, and a large amount of negative feedback over several stages. The realized antennas with a physical length of 0.5 m have a flat frequency response from 5 kHz to 30 MHz and extremely low distortion (second-order intercept greater than +70 dBm, third-order intercept greater than +50 dBm). The antennas are thoroughly protected against statics; without sacrificing the high dynamic range. Output power levels up to +28 dBm can be handled. The electric field strength may exceed 10 V/m. The equivalent input noise field strength amounts to about 25 nV/m sq rt Hz.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- November 1980
- DOI:
- 10.1109/TAP.1980.1142418
- Bibcode:
- 1980ITAP...28..904N
- Keywords:
-
- Antenna Design;
- Microwave Amplifiers;
- Radio Antennas;
- Radio Signals;
- Signal Reception;
- Electric Field Strength;
- Frequency Response;
- Negative Feedback;
- Power Efficiency;
- Signal To Noise Ratios;
- Transfer Functions;
- Communications and Radar