Compensated broad-band two-way 0° hybrid power splitters and combiners

This letter proposes a simple technique of compensating the broad-band 0° hybrids, to obtain improved isolation characteristics. The compensation can typically enhance the low- and mid-band isolation by a factor of 25-40 dB, the high-band isolation by a factor of 5-10 dB, and the overall bandwidth by a factor of about one decade.