The resistive vee dipole (RVD) loaded with the Wu-King profile has
many advantages for use in ground-penetrating radar (GPR)
applications. It can be designed to transmit a temporally-short
pulse to a small spot on the ground. The shape of the transmitted
pulse is simply related to the input signal, e.g., a derivative.
The RVD also has a low radar cross section. In addition, it can be
easily manufactured using a circuit board and discretely loading
it with chip resistors. One drawback of the RVD is that the input
impedance of the RVD increases significantly with decreasing
frequency and, therefore, has a high voltage standing wave ratio
(VSWR) at low frequencies, which limits the low-frequency response
of the antenna. To improve the low-frequency response, a
discretely-loaded resistive linear antenna (RLA) has been
developed, whose basic principle of operation is the same as that
of the RVD. The RLA has curved arms loaded with a modified Wu-King
profile instead of straight arms loaded with the Wu-King profile.
With an appropriate selection of the curve and the loading
profile, the low-frequency response is significantly better for
the RLA than for the RVD. The RLA has been developed using a
method of moments code. The performance of the RLA is validated
both numerically and experimentally.