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This work shows a compact, low loss antenna-plexer for mobile devices. The antenna-plexer uses compact acoustic bandpass filters and lumped elements.

This paper presents the design consideration on a converged Rx surface acoustic wave (SAW) duplexer module for integrated RF front end. Two different matching-circuit and notch-circuit configurations were examined with importance placed on electrical characteristics (insertion loss and isolation of duplexer) and simplification of module, respectively. From circuit simulations and examinations, we verified that a simplified design was best in terms of both characteristics and space in the case of a finite inductor’s Q. We also fabricate a quad-band converged Rx module (Band I + II, V + VIII) using an SAW duplexer and verified that its electrical characteristics agree well with our simulation results.

A novel surface acoustic wave (SAW) duplexer module called a converged Rx duplexer module is proposed. The Rx ports of two duplexers for different frequency bands are combined using passive matching components in the module, which reduces the number of Rx pins by half. A feasibility study including the issue of isolation between the bands is discussed and a prototype composed of four duplexers (two converged-Rx ports) is fabricated using the stacked-duplexer layout. The fabricated module features reduced Rx Pins, an area reduced by about 40%, and a sufficient isolation of 55 dB between the converged frequency bands.