Microwave antennas derived from the cassegrain telescope

@article{citeulike:2421499, abstract = {A microwave antenna can be designed in the form of two reflecting dishes and a feed, based on the principle of the Cassegrain optical telescope. There are a variety of shapes and sizes available, all described by the same set of equations. The essential performance of a Cassegrain double-reflector system may be easily analyzed by means of the equivalent-parabola single-reflector concept. Techniques are available for reducing the aperture blocking by the sub dish of the Cassegraln system: one method minimizes the blocking by optimizing the geometry of the feed and sub dish; other methods avoid the blocking by means of polarization-twisting schemes. The former method yields good performance in a simple Cassegrain antenna when the beamwidth is about<tex>1deg</tex>or less. The latter methods are available for any application not requiring polarization diversity, and an optimized set of polarization-operative surfaces has been developed for these twisting Cassegrain antennas. Experimental results, presented for practical antennas of both types, illustrate the feasibility of these principles. A number of unusual benefits have been obtained in the various Cassegrain antenna designs, and additional interesting features remain to be exploited.}, author = {Hannan, P. }, booktitle = {Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988]}, citeulike-article-id = {2421499}, journal = {Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988]}, keywords = {antennas, cassegrain, microwave}, number = {2}, pages = {140--153}, posted-at = {2008-02-24 13:37:19}, priority = {2}, title = {Microwave antennas derived from the cassegrain telescope}, url = {http://ieeexplore.ieee.org/xpls/abs\_all.jsp?arnumber=1144976}, volume = {9}, year = {1961} }

TY - JOUR ID - citeulike:2421499 L3 - citeulike-article-id:2421499 TI - Microwave antennas derived from the cassegrain telescope T2 - Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] JF - Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] VL - 9 IS - 2 SP - 140 EP - 153 N2 - A microwave antenna can be designed in the form of two reflecting dishes and a feed, based on the principle of the Cassegrain optical telescope. There are a variety of shapes and sizes available, all described by the same set of equations. The essential performance of a Cassegrain double-reflector system may be easily analyzed by means of the equivalent-parabola single-reflector concept. Techniques are available for reducing the aperture blocking by the sub dish of the Cassegraln system: one method minimizes the blocking by optimizing the geometry of the feed and sub dish; other methods avoid the blocking by means of polarization-twisting schemes. The former method yields good performance in a simple Cassegrain antenna when the beamwidth is about<tex>1deg</tex>or less. The latter methods are available for any application not requiring polarization diversity, and an optimized set of polarization-operative surfaces has been developed for these twisting Cassegrain antennas. Experimental results, presented for practical antennas of both types, illustrate the feasibility of these principles. A number of unusual benefits have been obtained in the various Cassegrain antenna designs, and additional interesting features remain to be exploited. KW - antennas KW - cassegrain KW - microwave AU - Hannan, P PY - 1961/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1144976 ER -