Broadband Grounded Vertical Antennas for 30-180 MHZ (VHF)
Abstract:
The invention is an antenna with broad frequency range to act as either source antenna transmitting signals or receive antenna receiving signals, with a known gain value. The antenna is separated into two variant antennas one to cover 30-60 MHz and one to cover 60-180 MHz. Because this antenna is broadband in frequency, no matching or physical tuning is necessary, allowing for straightforward testing. The antenna is designed for vertically-polarized electric fields aton a general ground surface with the antenna pattern being omniazimuthal up to 15 above the horizon and predominantly less than 41 standing wave ratio across the band. The antenna utilizes simple elements to achieve desired performance across its frequency band a combination of one or two cone elements and a linear whip on top of a square ground plane.