Republic of SingaporeThis paper presents the development of an ultra-wideband (300 to 3000 MHz), vertically

This paper addresses the development of an ultra INTRODUCTIONThe JTRS is being developed to meet emerging needs for ultra-wideband tactical radios. The desired 2 MHz to 2000 MHz operating frequency range poses a major challenge with regards to the antenna system. The current tactical radio antennas are not capable of operating efficiently over such a wide frequency range. In addition, they also have visual signatures that expose the operator's position. Therefore, in order to implement the JTRS, new types of antennas need to be developed, especially for the manportable implementation. This paper presents computer simulation results and prototype measurements for a conformal helmet antenna intended to operate from 500 MHz to 2000 MHz, i.e., over a 4:l bandwidth. The