## Abstract A microstrip dual‐mode bandpass filter (BPF) using a circular patch resonator is investigated in this paper. Unlike the conventional dual‐mode patch‐resonator bandpass filter studied in the literature, the introduced filter is perturbed by one circular hole in the northeast area of the
✦ LIBER ✦
New microstrip diplexers using open-loop ring resonators with two transmission zeros
✍ Scribed by Lung-Hwa Hsieh; Kai Chang
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 86 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0895-2477
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## Abstract The miniaturization of hairpin band‐pass filters by employing two high‐permittivity ceramic substrates (with respective dielectric constants of 9.7 and 26.1) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication co