The equiangular spiral fed by a coplanar microstrip balun covering the S, C, X, and K Bands

Through a thorough review of the literature, four antennas were designed in software and fabricated to the simulated parameters. The software model was an extensively iterative process. However, once the impedance match and circularly polarized antenna gain of the models were acceptable, the assembled antennas confirmed the software models through their performance. It has been shown all four antennas exceeded the specification requirements through their high gain and narrow directivity.