A Capacitive Loaded Conformal Antenna With Bandwidth Enhancement

A spherical conformal antenna using capacitive coupling to enhance bandwidth is proposed in this paper. The radiating element of the antenna is conformal onto the top of a spherical shape. A metal disc connected with an coaxial cable is used to feed this radiation element, so as to avoid the problem of large inductance caused by the long probe. With this measure, the input impedance of the antenna is better matched 50 Ohm, so as to achieve a very wide bandwidth. The influence of antenna parameters on performance is studied. Simulation results at about 420 MHz are given.