Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-01-02
1976-10-19
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 98, 333 30R, H03H 926, H03H 932, H01L 4104, H01L 4110
Patent
active
039873790
ABSTRACT:
An acoustic surface wave filter has offset transmitting and receiving transducers formed on the wave propagating surface of a piezoelectric substrate. A two-segment multistrip coupler is interposed on the propagating surface and provides "track switching" or "sidestepping" action for signals within the coupler passband. The coupler includes a split-connected portion formed by electrically connected filamentary conductor pairs and a split-isolated portion formed by electrically continuous filamentary conductors and interleaved conductors having a discontinuity at their center. The split-connected portion attenuates the symmetrical mode components of acoustic waves within the coupler stop band while the split-isolated portion attenuates the anti-symmetrical mode portion of acoustic waves within the coupler stop band, producing an improved trap response.
REFERENCES:
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3947783 (1976-03-01), Maerfeld
Ekstrand Roy A.
Nussbaum Marvin
Smith Alfred E.
Zenith Radio Corporation
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