Cascaded surface wave device filters providing balanced and unba

Details Cascaded surface wave device filters providing balanced and unba Cascaded surface wave device filters providing balanced and unba

1996-06-06

1998-08-04

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313D, 310313B, H03H 964

Patent

active

057900000

ABSTRACT:
A cascaded surface wave device filter comprises two 2-pole surface wave device filters connected in cascade. The 2-pole filters each provide a balun function between balanced and unbalanced signal connections, and have either their unbalanced or their balanced signal connections interconnected in the cascade to reduce electromagnetic feedthrough and improve spurious mode suppression. The 2-pole filters are conveniently longitudinally coupled double mode surface wave resonators which are described, or transversely coupled double mode surface wave resonators. Higher order filters can be provided by connecting further 2-pole filters in the cascade. The cascaded filter is particularly useful for filtering at radio and intermediate frequencies in cellular radio equipment.

REFERENCES:
patent: 4539502 (1985-09-01), Este et al.
patent: 5223762 (1993-06-01), Masaie et al.
patent: 5365138 (1994-11-01), Saw et al.
patent: 5475348 (1995-12-01), Hode et al.
patent: 5568002 (1996-10-01), Kawakatsu et al.
"Wideband Low Loss Double Mode SAW Filters", T. Morita et al, Proceedings of the IEEE Ultrasonics Symposium, 1992, pp. 95-104.
"High Performance SAW Filters With Several New Technologies for Cellular Radio", M. Hikita et al, IEEE Ultrasonics Symposium, 1984, Proceedings, pp. 82-92.
"Narrow Bandpass Filter Using Double-Mode SAW Resonators on Quartz", M. Tanaka et al, IEEE 38th Annual Frequency Control Symposium, 1984, Proceedings, pp. 286-293.

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