CCavity Backed Spiral Antenna

This self-complementary Archimedean spiral antenna is a frequency independent antenna. It is a lightweight medium-gain array designed to receive a circularly polarized wave.  The Archimedes spirals typically cover a 10 to 1 frequency range while maintaining essentially constant impedance over the band.  The circularly polarized antennas have been designed for broad-beam, broadband applications and provide a compact, lightweight antenna configuration which can be easily flush mounted. They are widely used in systems whose primary functions are surveillance, direction finding and telemetry.  This Spiral antenna is mounted in a square structure and made on FR4 .063” fiberglass with a flat front face that can be easily mounted in the side of a vehicle.   It is terminated and loaded with absorbing foam.  Its low frequency is a function of the size and depth of the cavity, while the upper frequency is limited by the detail of the center structure.  It has greater than a 10 dB F/B ratio before mounting into a vehicle. 

Electrical Specifications

12”      

5”        

300 MHz          

3 GHZ                         

$1450