About a New Procedure for Offset Bifocal Reflector Antennas Synthesis

A High-Gain Multibeam Bifocal Reflector Antenna With 40° Field of View for Satellite Ground Station Applications

“…The reflector surfaces are calculated using the constant optical path length principle and Snell's reflection law and determined as functions of two parametric variables p and t. For a more detailed description of the designing procedure refer to [4], [5]. The geometry of the BFRA is determined by the following data set:…”

“…confirmed in [3] that it is difficult to design a BFRA with a FoV wider than 20°, especially if a high-gain antenna is needed. However, recent studies [4], [5] have shown that it is possible to synthesize a BFRA with a wide FoV up to several tens of degrees (in one plane).…”

“…Hence, the second caustic surface is located behind the subreflector. The BFRA was designed using the following main idea from [4]. For each of two beams with exact focusing the most efficient (in terms of geometrical-optics (GO) rays) main reflector illumination should be ensured while we accept that only half the…”

Multibeam bifocal reflector antenna design with 40º field of view: A candidate for high gain ground station application

“…Associated synthesis procedure is characterized by effective usage of the whole main reflector aperture for all antenna beams [5]. An example design of BFRA with a FoV of 47° and AE higher than 50% was shown in [5]. This antenna has a double Cassegrain configuration with aperture dimensions of about 60 λ x 60 λ (λ is a wavelength).…”

“…In [7] it was noted that the BFRA with a FFOG configuration has higher aberrations than the comparable bifocal design with a Cassegrain configuration from [5]. So it seems interesting to investigate the possibilities of designing BFRAs with a Gregorian configuration suitable for high gain multiple beam ground station applications, especially if a FoV of about 40° could be considered sufficient.…”