DESIGN OF MICROWAVE FILTER NETWORKS.
Abstract
Equations are derived for determining the characteristic impedance, propagation velocity, and attenuation constant of microstrip transmission lines. Analysis of the factors influencing measurements on the real part of the input admittance of a piezoelectric transducer is presented. It has been shown that, unless a rather large series resistance is present, measurements of conductance as a function of frequency yield information from which the value of the electromechanical coupling coefficient can be determined. The successful fabrication of thin-film CdS microwave acoustic transducers is reported. The measured loss characteristics of these transducers are described and the effects of a tuner and transducer mount are described. The feasibility of depositing thin films of lithium niobate by means of chemical vapor deposition has been demonstrated. The vapor deposition technique is described. Bandwidth curves are given, for Mumford's maximally flat transmission line bandpass filter. When used in conjunction with Mumford's tabulated design parameters, the curves give filter attenuation in all regions of the stop band, provided that the attenuation is greater than 15 dB. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0820116
Entities
People
- Alfred J. Bahr
- Bernard M. Schiffman
- Edward G. Cristal
- Ian N. Court
- Leo Young
Organizations
- SRI International