Design and Realization of a Wideband Microstrip Filter Using Signal- Interaction Techniques
Keywords:
Passband, phase inverter, transmission path, transmission pole, transmission ZeroAbstract
The signal-interaction techniques are adopted in this paper to design a novel wideband microstrip filter. The signal is transmitted from input port to the output one through two transmission paths in parallel which is composed of a wideband 180° inverter based on microstrip line and a 3?/4 transmission line. Besides, two ?/4 shorted-ended lines is employed to improve the passband transmission performance of the BPF (Bandpass Filter). It is demonstrated from the simulation and measurement results of the novel BPF that three transmission zeros leading to the good harmonic suppression performance are achieved for the BPF operating from 0.99 to 2.51 GHz with 3-dB fractional bandwidth of 86.8%.
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