Overview
The ETS-Lindgren Model 3100 Series Conical Log Spiral antennas are circularly polarized broadband antennas covering the frequency range of 100 MHz to 10 GHz. The Conical Log Spiral antennas are designed specifically for EMI measurements and compliance testing as called for in various Military Standards.
Each antenna is constructed of a fiberglass cone upon which two logarithmic spirals of 50-ohm coaxial cable are securely fastened. Outside windings improve heat dissipation. The coaxial connectors are located in the phenolic base plate of
the cone. A 1/4–20 adapter for a tripod or other mounting configuration is attached to the antenna near its horizontal center of gravity or at the antenna base plate.
The Conical Log Spiral antennas receive both circular polarized and linear polarized fields (with a 3-dB variance for linear fields) under normal operating conditions.
Model 3101L is left-hand wound, and transmit and receive a right-hand circularly polarized wave.
For a right-hand wound Conical Log Spiral Antenna that transmits and receives a left-hand circularly polarized wave, see model ETS-Lindgren 3102
