Design and Test of a UHF Deployable Conical Log Spiral Antenna for Small Satellites

The design and experimental test results for a deployable broadband conical log spiral antenna intended for small satellites are presented. A performance trade-off was conducted, resulting in a feasible mechanical design whilst retaining good radiation characteristics. A deployment mechanism is proposed, and electrical and mechanical prototypes manufactured. The antenna has a measured directivity of approximately 6 dBi from 600 to 1500 MHz and is matched at 100 Ω input impedance.