Compact Bandpass Filter with Wide Upper- Stopband Based on Spiral-shaped Resonators and Spur-lines
نویسندگان
چکیده
A novel compact bandpass filter (BPF) with wide upperstopband has been proposed in this paper. The structure is based on spiral-shaped resonators. Cross coupling is used to generate two transmission zeros at the lower and upper stopbands. Therefore, the out-of-band performance is improved. In addition, two spur-lines are adopted in the feed lines to reject the spurious response. The central frequency f0 of this filter is at 2.45 GHz with a minimum insertion loss of less than 1 dB and a 3 dB bandwidth of 12.5%. Four transmission zeros are located at 2 GHz, 3GHz, 5.5 GHz, and 8GHz. The attenuation is greater than 20 dB in a wide upper stopband up to 9.8GHz.
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تاریخ انتشار 2012