Fractional efficiency coupler

Details Fractional efficiency coupler Fractional efficiency coupler

1975-06-16

1977-07-26

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 82, 310 98, 333 72, H03H 926, H03H 930, H03H 932, H01L 4104

Patent

active

040386147

ABSTRACT:
Surface acoustic wave devices having broadband characteristics with a desired transfer efficiency of less than unity at a desired center frequency are described, the devices incorporate a multistrip coupler array of a predetermined number N of conductive strips disposed on a piezoelectric substrate which is capable of supporting two tracks of approximately equal widths of propagating surface acoustic wave energy, the array having a tapping portion in one of the tracks and an approximately equal length launching portion in the other of the tracks for launching only a portion of the energy incident on the tapping portion, the strip periods p.sub.1 and p.sub.2 of the two portions being different and the ratio of p.sub.1 /p.sub.2, in conjunction with N, provides the desired characteristic.

REFERENCES:
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3859608 (1975-01-01), Hartmann et al.
patent: 3898592 (1975-08-01), Solie
patent: 3911381 (1975-10-01), Brooks et al.
patent: 3947783 (1976-03-01), Maerfeld
Marshall et al., "Surface Acoustic Wave Multistrip Components and Their Applications", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-21, No. 4, Apr. 1973; pp. 216-225.

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