Combline filters designed on symmetric stripline
| Autor: | M. E. Il’chenko, I. V. Trubarov, Alexander Zakharov |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Coupling Permittivity Radiation Materials science business.industry Acoustics Electrical engineering 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics 01 natural sciences Microstrip Electronic Optical and Magnetic Materials Resonator Filter (video) 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Center frequency business Microwave Stripline |
| Zdroj: | Journal of Communications Technology and Electronics. 62:626-633 |
| ISSN: | 1555-6557 1064-2269 |
| Popis: | Problems arising during the design of stripline combline filters, which until quite recently were considered as all-stop microwave structures, are considered. It has been shown that the electromagnetic coupling coefficient of quarter-wave stripline resonators increases with the value of material permittivity er, the operating frequency, and the thickness of the filter resonators. For er = 92 and a thickness of stripline resonators of 4 mm, it exceeds 12% at frequencies higher than 2.2 GHz. Two alternative versions of combline filters have been designed: a filter with a coupling strip and a filter without a coupling strip. Experimental data for a nine-resonator combline filter with a thickness of 4 mm, er = 9.7, and the center frequency f 0 = 2.4 GHz are presented. A method for increasing the selectivity of combline filters with the same number of resonators is proposed. It has been found that amplitude–frequency responses of stripline combline filters are near-symmetric, unlike the responses of microstrip combline filters. |
| Databáze: | OpenAIRE |
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