Compact CMOS C~Band Bandpass Filter Using Interdigital Capacitor

A novel miniaturized CMOS C-Band bandpass filter based on diagonally end-shorted coupled lines and interdigital capacitors is proposed The utilized coupled lines structure reduced the configuration in size, as small as a few degrees. Moreover, the characteristic of interdigital capacitor, relatively high Q and good capacitance tolerance, accounts for the satisfied performance of this new filter. A two-stage bandpass filter was designed and fabricated with chip surface area only 1.02x1.4㎟

1. Introduction

2. Bandpass filter using miniaturized N4 section

3. Interdigital capacitor design

4. Bandpass filter design and measurement result

5. Conclusion

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