Acoustic wave ladder filter with effectively increased coupling

Details Acoustic wave ladder filter with effectively increased coupling Acoustic wave ladder filter with effectively increased coupling

1997-11-04

1999-08-03

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, H03H 964, H03H 952

Patent

active

059330627

ABSTRACT:
An acoustic wave ladder filter (30) with lossy inductances (42) connected in parallel with resonators (40). Shunt sections (36,37) of the ladder filter (30) include impedance inverters having pass frequencies within the stopband of series resonators (33,34,35). The filter (30) additionally includes variable capacitors (44) connected in parallel with the inductances (42) to provide adjustment capabilities. The use of lossy inductances (42) actually increases effective coupling coefficient of the filter (30) and improves insertion loss thereby allowing improved design flexibility.

REFERENCES:
patent: 2222417 (1940-11-01), Mason
patent: 5471178 (1995-11-01), Hickernell
patent: 5600287 (1997-02-01), Kwan et al.
patent: 5610566 (1997-03-01), Chen et al.
patent: 5638036 (1997-06-01), Penunuri et al.
Jumonji; "High-Impedance Piezoelectric Ceramic Resonators and Their Application to Ladder Filters"; Electronics and Communications in Japan, vol. 53-A, No. 8, 1970; pp. 17-23, Jan. 1970.

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