A shaped offset-fed dual-reflector antenna

A Shaping Technique for Air-Borne Scanning Reflector Antenna

“…If the aperture is infinite large, k y = k 0y is the only spectral component, and subsequently, the farfield becomes a plane wave. For a circular aperture, i.e., x 2 + y 2 < T , it can be proved that the peak radiation direction is the same as Equation (6). If the amplitude distribution is a Gaussian type, while the phase is that of Figure 1(b), for example…”

“…The shaping technique has a long history, dating back to early 1960s. Later on, a number of shaping techniques have been developed to meet different applications [5][6][7][8][9][10][11][12][13][14][15]. Collins [5] investigated the shaping technique to maximize the aperture efficiency of Cassegrainian Antennas.…”

“…Collins [5] investigated the shaping technique to maximize the aperture efficiency of Cassegrainian Antennas. Lee et al [6] used geometrical optics to design offset-fed dual-reflector antennas, where satisfactory sidelobes and aperture efficiency were obtained. Kildal [8] developed a dynamic ray tracing technique to analyze multi-reflector antennas of numerically specified reflectors.…”

“…The aforementioned shaping techniques do not fit these requirements completely. For instance, the method presented by Collins [5] did not consider the functionality of scanning; Lee's method [6] is suitable for offset structure, which is not employed in the mission; Bucci's [11] method is suitable for cases where feed array is utilized. In this regards, a new shaping scheme has to be developed.…”

Síntese De Antenas Refletoras Utilizando Seções Cônicas E Superfícies Quádricas Confocais

“…Com uma abordagem um pouco diferente, e mais uma vez utilizando os conceitos da GO aplicados em [19] e [20], em [33]é apresentada uma técnica aproximada para a síntese de antenas duplo-refletoras offset com fase uniforme na abertura. A primeira aproximaçãoé feita na imposição da conservação da energia ao longo de um tubo de raios.…”