A new high-performance surface-acoustic-wave (SAW) filter for use in mobile telephones is presented in this paper. The design for the actual realization of the new filter is examined, from the new filter configuration to the final device operation, A low-loss weighting technique in an interdigital transducer (IDT), a new resonant structure, computer simulation procedures, and material properties are treated. Experimental results with this SAW filter included an 830-MHz center frequency, 3-percent bandwidth, insertion loss of as low as 3.5 ~ 4.0 dB, and 50-dB sidelobe suppression filter.

800-MHz High-Performance SAW Filter Using New Resonant Configuration

High Performance SAW Filters with Several New Technologies for Cellular Radio

Phase Weighting for Low Loss SAW Filters

A new high performance SAW filter for a mobile telephone is presented here. New technologies - - low loss weighting in an IDT, and a new resonant filter configuration - - are described. Experimental results with 3.5~4.0 dB insertion loss at 830 MHz are presented.

800 Mhz Low Loss Saw Filter Using New Phase Weighting

When LORD RAYLEIGH [1] mathematically derived what he called surface waves, he was not contemplating use of those waves in radio frequency systems at frequencies between 10 and 1000 megahertz. However, devices using Rayleigh waves at these frequencies are now in everyday use in many households as well as being used as critical elements in a wide variety of military and commercial systems.

Systems Impact of Modern Rayleigh Wave Technology

Low lossSAW filtershavebeen u sedina remarkable number of system applications The frequency ranoe for low loss devices has been from 30 MHz to 440 MHz 1 to 2 GHz devices can be manufactured using h igher resolution fabrication techniques Results fromunweighted, lithium niobate, and STcut Quartzdevices at 1233 FlHz are presented Weighting techniques for frequency sidelobe suppression are also discussed along with results from a 1233 MHz weighted ST-Quartz device

L-Band Low Loss SAW Filters

Low lossSAW filtershavebeen u sedina remarkable number of system applications. The frequency ranoe for low loss devices has been from 30 MHz to 440 MHz. 1 to 2 GHz devices can be manufactured using h igher resolution fabrication techniques. Results fromunweighted, lithium niobate, and STcut Quartzdevices at 1233 FlHz are presented. Weighting techniques for frequency sidelobe suppression are also discussed along with results from a 1233 MHz weighted ST-Quartz device.

B.R. Potter

Papers

L-Band Low Loss SAW Filters

L-Band Low Loss SAW Filters