Dual Frequency Feed Horn Design for a Compact Cloud and Precipitation Radar Operating at Ka- and W-band

Compact Dual Band Feed System for a Multifrequency Atmospheric Radar

“…A 12-dB beam width of 31 • at 35.75 GHz and 21 • at 94.05 GHz is obtained after the optimization. Although, the achieved Ka-band beam width of 31 • is slightly larger than the required value, simulations with the test reflector show a low spill over loss of 0.72 dB at Ka-band and 0.26 dB at W-band from the designed horn [4]. The focus of the test reflector is placed exactly in between the Ka-band and the W-band phase centers as this is found to be the optimum position to achieve best performance at both the operating frequencies [4].…”

“…The diplexer consists of two orthogonal ports, a WR28 waveguide port for the Ka-band signal and a WR10 port for the W-band signal. The radius of the cylindrical diplexer cavity, r = 3 mm is designed to provide a cutoff frequency (f c ) of 29.3 GHz, below the operating frequency of 35.75 GHz [4]. The TE11 mode cutoff frequency of the circular waveguide is matched with the TE10 mode cutoff frequency of the rectangular waveguide as follows [15]:…”

“…The radar electronics design is intended to be modular allowing to deploy different combinations of CloudCube's frequency bands to address focused science questions within a budgetconstrained environment. Hence dual frequency (Ka/W, W/G-band) and multifrequency (Ka/W/G-band) horns are being designed [4], [5]. A wide variety of multifrequency horn solutions have been proposed in the literature.…”