The IPP-7133 from Innovative Power Products is a 90 Degree Hybrid Coupler that operates from 4 to 6 GHz. This 3 dB coupler has an insertion loss of less than 0.25 dB, isolation of over 18 dB and can handle 100 watts of average power. The hybrid coupler is available in a surface mount package that measures 0.20 x 0.56 inches.