An impedance-matching technique for increasing the bandwidth of microstrip antennas

@article{citeulike:2674447, abstract = {The nature of the inherent narrow bandwidth of conventional microstrip patch antennas is considered. It is observed that, except for single-feed circularly polarized elements, their bandwidth is limited only by the resonant behavior of the input impedance and not by radiation pattern or gain variations, which usually are negligible over a moderate 10 to 20\% bandwidth. Therefore, broadband impedance matching is proposed as a natural to increase the bandwidth. The maximum obtainable bandwidth is calculated using Fano's broadband matching theory. It is found that by using an optimally designed impedance-matching network, the bandwidth can be increased by a factor of at least 3.9, the exact value depending on the degree of matching required. A transmission-line prototype for a proper matching network is developed. The translation of this prototype network into a practical structure (e.g. a microstrip or stripline circuit) is considered. Practical design examples and experimental results which clearly show the validity of the technique are given}, author = {Pues, H. F. and Van de Capelle, A. R. }, booktitle = {Antennas and Propagation, IEEE Transactions on}, citeulike-article-id = {2674447}, doi = {10.1109/8.43553}, journal = {Antennas and Propagation, IEEE Transactions on}, keywords = {antenna, bandwidth, impedance, microstrip, patch}, number = {11}, pages = {1345--1354}, posted-at = {2008-04-15 18:46:44}, priority = {2}, title = {An impedance-matching technique for increasing the bandwidth of microstrip antennas}, url = {http://dx.doi.org/10.1109/8.43553}, volume = {37}, year = {1989} }

TY - JOUR ID - citeulike:2674447 L3 - citeulike-article-id:2674447 TI - An impedance-matching technique for increasing the bandwidth of microstrip antennas T2 - Antennas and Propagation, IEEE Transactions on JF - Antennas and Propagation, IEEE Transactions on VL - 37 IS - 11 SP - 1345 EP - 1354 N2 - The nature of the inherent narrow bandwidth of conventional microstrip patch antennas is considered. It is observed that, except for single-feed circularly polarized elements, their bandwidth is limited only by the resonant behavior of the input impedance and not by radiation pattern or gain variations, which usually are negligible over a moderate 10 to 20% bandwidth. Therefore, broadband impedance matching is proposed as a natural to increase the bandwidth. The maximum obtainable bandwidth is calculated using Fano's broadband matching theory. It is found that by using an optimally designed impedance-matching network, the bandwidth can be increased by a factor of at least 3.9, the exact value depending on the degree of matching required. A transmission-line prototype for a proper matching network is developed. The translation of this prototype network into a practical structure (e.g. a microstrip or stripline circuit) is considered. Practical design examples and experimental results which clearly show the validity of the technique are given KW - antenna KW - bandwidth KW - impedance KW - microstrip KW - patch AU - Pues, HF AU - Van de Capelle, AR PY - 1989/// UR - http://dx.doi.org/10.1109/8.43553 ER -