Hr. Ahn et al., MINIATURIZED 3-DB RING HYBRID TERMINATED BY ARBITRARY IMPEDANCES, IEEE transactions on microwave theory and techniques, 42(12), 1994, pp. 2216-2221
In the UHF or VHF band, the new design method of small-sized 3-dB 0 de
grees/180 degrees ring hybrid terminated by arbitrary impedances using
both lumped and distributed elements is presented, At the center freq
uency of 900 MHz, the small sized 3-dB 0 degrees/180 degrees hybrid te
rminated by arbitrary impedances is designed, analyzed and tested, Goo
d agreements are obtained between measured and predicted results. Sinc
e both lumped and distributed elements are used, the proposed hybrid i
s occupied about 30% of all distributed-type hybrid.