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In this paper, a novel tunable bandpass filter with an improved J‐inverter is suggested. In this resonator, as the loading capacitance is increased, the resonant frequency is decreased. Also, the phase of the admittance inverter has characteristics that are variable by series capacitors and parallel varactor diodes. The electrical length of the inverter always maintains 90° at a given physical length...
In this paper, a novel ultra wideband (UWB) bandpass filter is presented using stepped-impedance resonator and vertical coupling structure. This filter configuration is presented with bandwidth up to 135.8 percent covering the 2.2-11.5 GHz range. Excellent stopband performance is obtained up to 17.7 GHz. They show the insertion loss of 1.8 dB and return loss of 14 dB at the center frequency 6.85 GHz.
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