Abstract
A compact coupled-line bandpass filter with multiple capacitive cross-couplings to create four transmission zeros is proposed. The locations of transmission zeros can be adjusted by varying the values of cross-coupled capacitances so as to improve the filter selectivity. The proposed filter is based on one-eighth-wavelength (λ/8) coupled-line sections and quarter-wavelength (λ/4) resonators, thus it occupies only half of the circuit area comparing with the conventional coupled-line bandpass filters. Specifically, a fourth-order microstrip coupled-line bandpass filter centered at 2.46 GHz with a 3-dB bandwidth of 10.2% and four transmission zeros is implemented and examined.
Original language | English |
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Pages (from-to) | 579-581 |
Number of pages | 3 |
Journal | IEEE Microwave and Wireless Components Letters |
Volume | 15 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2005 |
Keywords
- Bandpass filter
- Coupled-line
- Microstrip
- Multiple cross-couplings