The DDCH-50-521+ from Mini Circuits is a Dual Directional Coupler that operates from 20 to 520 MHz. It provides 50 dB of coupling with a directivity of 21 dB and an insertion loss of 0.07 dB. The coupler can handle up to 300 watts of power and has an excellent return loss of 35 dB. It is available in a surface mount package that measures 1 x 1.5 x 0.128 inches and is ideal for defence, military, GSM transmitters, research and development labs applications.
