Abstract
A new planar dua1-mode microstrip bandpass filter with a square notch is proposed. The proposed filter structure uses a single patch without coupling gaps. This filter has two transmission zeros on both sides of the passband. The insertion loss is l0dB within 1.96–2.13GHz, and the minimum insertion loss is 0.07dB at about 2.05GHz. The 3dB fractional bandwidth is 12.73%. The effect on the filter's performance by changing filter parameters is studied. The results show that this new filter can provide a low insertion loss and reduce uncertainty in fabrication. It also makes miniaturization easy.
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