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Design of a compact dual-mode ring resonator bandpass filter with harmonic suppression |
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| Authors: | Fenq-Lin Jenq Kwok-Keung Chong Hsuan-Der Yen Chien-Chih Liu |
| Affiliation: | 1. Department of Electronic Engineering , Far-East University , Tainan County 744, Taiwan, R.O.C.;2. Department of Microelectronic Engineering , National Kaoshiung Marine University , Kaoshiung City 811, Taiwan, R.O.C. Phone: 886-7-3617141 ext: 3365 Fax: 886-7-3617141 ext: 3365 E-mail: kkchong@mail.nkmu.edu.tw);3. Department of Electrical Engineering , Nan Jeon Institute of Technology , Tainan Hsien 737, Taiwan, R.O.C. |
| Abstract: | Abstract An approach to suppress the harmonic responses in a dual-mode circular ring resonator bandpass filter is presented. Feed lines with one-sided coupling arms are suitably relocated around the ring resonator to introduce phase interference between two degenerate modes for simultaneously suppressing the second and third harmonics. Three open loop resonators at the rim of the ring are adopted to further suppress the second harmonic. By fabricating on a FR4 glass-epoxy base, this approach is demonstrated to have effectiveness in broadening the filter's rejection band in both simulations and measurements without affecting the fundamental response or increasing the device size. |
| Keywords: | bandpass filters dual-mode resonator filter harmonic suppression phase shift |