Small-sized wideband CVT- and CCT-ring filters

Hee-Ran Ahn, I. Wolff, Noh-Hoon Myung
IEEE MTT-S International Microwave Symposium Digest, 2003  
Absh.act---Two types of small-sized wideband CVT-(constant VSWR impedance transformer) and CCT-(constant conductance impedance transformer) ring filters are introduced, designed, simulated and one of two, a CCT-ring filter, is tested. They consist of CVTs and CCTs, and two short stubs are connected at 90" and 270" positions of each ring. The circumference of the ring can be reduced theoretically up to 60" and two of many cases having about 300" circumferences are simulated. The simulated
more » ... show more than 100% fractional bandwidth, which can be obtained with more than 5 stages in conventional design techniques. A CCT ring filter suggested in this paper has been fabricated in microstrip technology and the measured results show good agreement with the simulated ones.
doi:10.1109/mwsym.2003.1210445 fatcat:yx67bovghbfendv3pk7blqmdya