Resistively Loaded Discones for Uwb Communications
نویسندگان
چکیده
An Ultra-Wideband (UWB) antenna is required for UWB communications systems, such as the Joint Tactical Radio System (JTRS). In this case, the desired antenna must cover a bandwidth of 20 MHz to 4 GHz, be omnidirectional, be convenient to transport and deploy, and be able to transmit 200 Watts of power. Conventional discone antennas are candidates for such systems, but they have insufficient bandwidth for the required application. To improve their bandwidth, we added resistive loading to the conical elements and to the ground plane, and we increased the size of the ground plane. We built several models of the resistively loaded discone, and we observed a dramatic reduction in VSWR when compared to a commercial off-the-shelf (COTS) discone. We also simulated the antenna pattern using the NEC computer code, and we used the antenna with an amateur radio. The resistively loaded discone has clear advantages for UWB communications when compared to the COTS discone.
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