Theory and Design of Wide-Band Multisection Quarter-Wave Transformers

An Exact Synthesis Method for Dual-Band Chebyshev Impedance Transformers

“…In this section we present our method to design a dual-band Chebyshev impedance transformer based on the exact Collin-Riblet synthesis procedure [15,16].…”

“…Once the polynomial Q N (·) is given, the Collin-Riblet design method allows the characteristic impedances of the transformer sections to be calculated [15,16]. The polynomial Q N (·) can be chosen so that the impedance matching condition is obtained in the two separate equal-width bands Ω 1 and Ω 2 .…”

“…Once the constants a, b and k have been computed, the power loss ratio P LR is completely determined and the characteristic impedances of the transformer sections can be computed using the Collin-Riblet method [15,16].…”

“…The method is based on the exact Collin-Riblet design procedure [15,16] which allows the characteristic impedances of the transformer sections to be iteratively calculated once the power loss ratio (the power available from the generator divided by the power delivered to the load) is given. In the exact synthesis of single-band equi-ripple transformers the power loss ratio is enforced to be a suitable function of the Chebyshev polynomial with argument cos θ [1].…”

A Compact Multiband BPF Using Step-impedance Resonators with Interdigital Capacitors

“…The proposed technique can reduce the resonator size from ⁄2 to ⁄8, which it is the most compact size compared with other transmission line resonators in literatures. In addition, the techniques of multi-section feeding for multiband matching [20], [21] and overlap cross coupling for insertion loss reduction will be applied. The proposed filter can response for multiband operation of GSM, Wi-MAX, and WLAN systems.…”