## Abstract Using high permittivity ceramic substrates and capacitive coupling to miniaturize the sizes of Butterworth bandpass filters are investigated. The selectivity and stopband rejection of the designed filters can be improved significantly by utilizing a skew‐symmetric (zero degree) feed str
A miniaturized bandpass filter fabricated on high dielectric constant ceramic substrates
✍ Scribed by Ming-Liang Hsieh; Tsung-Hui Huang; Lih-Shan Chen; Chian-Hao Sun; Shuming Wang; Mau-Phon Houng; Shen-Li Fu
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 198 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
A four‐pole open‐loop resonator bandpass filter fabricated on high dielectric constant (Zn~0.9~Mg~0.1~)TiO~3~ ceramic substrates is presented. The full‐wave simulator IE3D is utilized to calculate the coupling coefficients of each basic coupling structure and simulate S‐parameters of the designed bandpass filters. The center frequency of designed bandpass filter is f~o~ = 2.45 GHz and the fractional bandwidth is 4%. The center frequency of the fabricated bandpass filter is at 2.47 GHz and the fractional bandwidth is 5%. The measured insertion loss and return loss of the filter is −3.68 and −14.92 dB, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2087–2090, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22698
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