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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v65.i2.20
pages 111-120

Filters on the Acoustical Surface Waves with Combined Single-and Dual-Mode Sections

S. V. Kiselev
E. I. Fedorov
Institute of Physics of the Earth, Russian Academy of Sciences, 10, Bolshaya Gruzinskaya, 124995, Moscow, Russia
V. S. Orlov

RÉSUMÉ

Filter structures on the acoustical surface waves (ASWs) with small insertion losses with combined elementary ladder or balance-bridge sections on single-mode single-input resonators (LDR or BBR) and dual-mode sections on longitudinally connected resonators (LCRs) are described. Such combinations of single- and dual-mode sections allow operation at interim or carrier filter frequencies with axial or balance loads of 50−300 Ω with insertion losses IL = 2.3−3.8 dB, without using additional matching circuits and higher attenuation in the attenuation band up to UR = 55−70 dB in a broad frequency band. Problems of matching of elementary sections for reduction of distortions due to reflections have been analyzed. Examples of filters on ASWs with LDR−LCR−LDR; LCR−LDR−LCR; LCR−BBR−LCR; LDR—BBR structures for frequencies of 442, 484, 135, 105, and 160 MHz are given.


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