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A BI-DIRECTIONAL FREQUENCY TRIMMABLE STRIPLINE FILTER

IP.com Disclosure Number: IPCOM000006454D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-04
Document File: 1 page(s) / 78K

Publishing Venue

Motorola

Related People

Robert S. Kaltenecker: AUTHOR [+2]

Abstract

This publication describes an implementation of a bi- directional t?equency bim for a shipline tilter. The frequency trim allows common PCB board material such as IX-4 to be used in high performance striplime fdteter applications instead of a high cost material such as teflon. In addition to the cost savings, a much larger supplier base results in multiple sourcing and often faster prototype service.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

A BI-DIRECTIONAL FREQUENCY TRIMMABLE STRIPLINE FILTER

by Robert S. Kaltenecker and John R. DeCamp Jr.

  This publication describes an implementation of a bi- directional t?equency bim for a shipline tilter. The frequency trim allows common PCB board material such as IX-4 to be used in high performance striplime fdteter applications instead of a high cost material such as teflon. In addition to the cost savings, a much larger supplier base results in multiple sourcing and often faster prototype service.

  Fii 1 illustrates the main elements and physical con- struction of a stripline filter. A stripline is a transmission line consisting of a center conductor (3) often but not nec- essarily symmetricaUy placed between two ground planes
(2). The Support for the center conductor is provided by the dielectric material (3). A stripline falter usually con- sists of multiple center conductors (1) often referred to as ,resonators. These center conductors are physically arranged in a predetermined fashion so that the resultant electrical properties provide the desired filter response.

  Traditionally stripline fdters are constructed using a class of dielectric materials referred to as "microwave" type. Teflon is one of the more commonly used "micro- wave" materials. These "microwave" materials have elec- trical properties and mechanical properties that are very tightly controlled. These tightly controlled properties allow for a very predictable tilter response to be achieved.

The bidirectional t?equenc...