Abstract
A new design of feed lines, called 'U Corner', is proposed in order to improve the rejected bandwidth of a compact microstrip filter topology. The first spurious resonance frequency can be conveniently suppressed by the use of two identical U corners at the input and output of the filter. After the derivation of design rules, a two-pole filter based on Parallel-Coupled Filter was designed for a proof-of-concept. The working frequency was chosen equal to 1 GHz with a 21.4 % fractional bandwidth. Measurements and simulations are in very good agreement. A wide stopband up to more than six times the working frequency was achieved. The insertion and return losses in the passband are 1.2 dB and 16 dB respectively. Index Terms-Microstrip bandpass filter, parallel-coupled line.
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