The design of differential bandpass filters using
coupled lines is presented. The topology proposed, consisting of
short-circuited coupled lines is analyzed by means of analytical
equations. The study is carried out by using equivalent circuit
models that provide some insights into the physical behaviour of
the proposed structure. Furthermore, to increase the bandwidth
of the filters, wire-bonded multiconductor transmission lines
(MTL) are employed. Three differential filters are designed and
fabricated with fractional bandwidths (FBW) of 15%, 120% and
130% (3-dB FBW). The measured differential-mode responses
show insertion losses lower than 1 dB with high common-mode
rejection levels greater than 20 dB. In addition, there is a very
good agreement between the theoretical and experimental results.
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