Abstract
A novel miniature microstrip bandpass filter (BPF) using resonator-embedded dual-mode resonator is proposed. Two transmission zeros are created to improve the selectivity of the filter. Furthermore, source-load capacitive coupling is introduced to create a transmission zero above the passband. A 2.28 GHz BPF with 300 MHz bandwidth is designed and measured, the measured result agrees well with the simulation. The size of the filter is less than 0.21 ? × 0.15 ?, where ? is guided wavelength at the central frequency.
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