The design and analysis of a radio frequency (RF) quadrature combiner using surface acoustic wave techniques and the coupling of modes model

Abstract

A first prototype RF signal quadrature combiner has been developed using surface acoustic wave (SAW) technology. The device is intended for use in quadrature communication systems and has four electrical ports; two RF inputs and two RF outputs. The device produces the real sum and the quadrature sum of the two input signals. There are various topologies for implementing the quadrature combiner, four of which were studied for possible implementation. Of the several modeling approaches for SAW devices, the coupling of modes (COM) model was selected and has been numerically implemented for use in the analysis of the quadrature combiner. The model developed is suitable for analyzing component structures of SAW devices. These structures include reflective gratings, interdigital transducers (IDT), and multistrip couplers (MSC). The modular analysis technique is adaptable to various general topologies for SAW devices other than the quadrature combiner. Two of the four topologies have been fabricated. These topologies use a -3 db coupler to provide the broadband 90 degree phase shift for the quadrature sum and a pair of

interdigital transducers to generate the real sum. Two IDT configurations were implemented for an IDT summer. Data on the interdigital signal summing topology is shown. The devices both have a center frequency of 115.6 MHz and 18% fractional bandwidth. The phase deviation of the quadrature sum is less than 1 degree. The critical dimension of these devices is four micrometers. Experimental data has been taken using a network analyzer and compared to the theoretical predictions .

Notes

If this is your thesis or dissertation, and want to learn how to access it or for more information about readership statistics, contact us at STARS@ucf.edu

Graduation Date

1995

Semester

Spring

Advisor

Richie, Samuel M.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Electrical and Computer Engineering

Degree Program

Electrical Engineering

Format

PDF

Pages

82 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029496

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

This document is currently not available here.

Share

COinS