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One aspect of this paper is to describe the possibilities for reducing the overall size of a monopole so that they can be hidden within a system rather than protrude from it. Improved bandwidth results from the bow-tie monopole but there are instances where individual bands rather than a single band is preferable, for example for rejection of unwanted signals. One class of antenna to replace the monopole...
Time-domain simulation techniques such as "transmission-line modelling" (TLM) are found to be particularly suitable in broad-band electromagnetic modelling of vehicles for the analysis of electromagnetic compatibility (EMC). In addition, these same models could equally well be used to investigate and optimise the installed performance of vehicle mounted antennas. The results of a preliminary...
It is well-known that tapered slot antennas (TSA) can operate over a wide frequency band. Some examples of these antennas have already been analysed and their performances are well-documented in the literature. In this category of antennas, one structure of current interest is the V-shaped TSA on a high dielectric constant substrate, reported by Simons et al. (see IEEE Trans. on Antennas and Propag...
Polarization-agile patch antennas comprise square or circular patches with independently biased varactor diodes connected between the patch and the ground plane, located symmetrically on each radiating edge. The feed probe is located on a bisecting diagonal line, simultaneously exciting orthogonal modes, and the phase relation between the modes, which is controlled by the varactor diode bias voltages,...
A full 3D moment-method (MoM) analysis is discussed which has a far-field approximation technique (FFA) embedded within its formulation. The FFA significantly improves the computational efficiency of the MoM reducing core memory and CPU by over 90% and 80% respectively. The analysis is applied to axially symmetric and offset reflectors, which have overall diameters ranging between 10-20 wavelengths...
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