%0 Journal Article
%A Yang, Li
%A Gómez García, Roberto
%T Input-absorptive high-order wideband balun bandpass filters with quasi-elliptic-type response
%D 2022
%U http://hdl.handle.net/10017/55324
%X A class of input-reflectionless high-order wideband
balun bandpass filters (BPFs) with quasi-elliptic-type response are
reported. They consist of two main circuit parts: 1) a three-port
reflective-type high-order balun BPF network and 2) a resistivelyterminated microstrip T-junction that is shunt connected at the
unbalanced port. The reflective-type balun BPFs developed with
5th- and 6th-order Chebyshev equal-ripple responses are firstly
described. By replacing the last two virtually-short-circuit-ended
quarter-wavelength transmission-line (TL) stubs with opencircuit-ended half-wavelength TL stubs, their balun counterparts
with two close-to-passband transmission zeros (TZs) are then
presented. As design example, a 5th-order input-reflectionless
quasi-elliptic-type wideband balun BPF is theoretically discussed.
Furthermore, for experimental-validation purposes, a proof-ofconcept two-layer microstrip prototype of 5th-order balun BPF is
simulated and tested. Its measured metrics are 2.05-GHz center
frequency, 3-dB fractional bandwidth of 63.61% for the two
output ports, input-power-matching levels higher than 10 dB, and
stopband-power-rejection levels above 26.1 dB from DC to 5 GHz.
%K Absorptive filter
%K Balun
%K Bandpass filter (BPF)
%K Multilayer circuit
%K Reflectionless filter
%K Transmission zero (TZ)
%K Vertical transition
%K Wideband filter
%K Telecomunicaciones
%K Telecommunication
%~ Biblioteca Universidad de Alcala