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02.07.12 -- Isolator And Circulator Basics

February 7, 2012

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Featured Article

Isolator And Circulator Basics
By MECA Electronics Inc.
An RF isolator is a two-port ferromagnetic passive device which is used to protect other RF components from excessive signal reflection. An RF circulator is a three-port ferromagnetic passive device used to control the direction of signal flow in a circuit and is a very effective, low-cost alternative to expensive cavity duplexers in base station and in-building mesh networks. Examples of both applications are covered in this article.

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Bulletin Board

Microwave Laminates Chart

This chart from Standard Printed Circuits, Inc provides the basic properties of the various laminates available and is sorted by dielectric constant values. Other data such as: volume resistivity, surface resistivity, arc resistance, tensile modulus, tensile strength, compressive modulus, flexural modulus, dielectric breakdown, specific gravity, water absorption, thermal conductivity, and UL flammability rating are available by contacting eng@standardpc.com or the laminate manufacturer.

Featured Downloads
Datasheet: 1- To 10-GHz Log Spiral Antenna
This log spiral antenna has been designed for aircraft use, but can also be used for anechoic chambers and enclosures where space is limited and isolation is critical. Right and left hand circular polarization is available.

Datasheet: Power Combiner/Divider For 900 MHz Wireless Systems
Narda offers the Model 30402 two-way RF power combiner that operates from 820 to 915 MHz, making it ideal for use in wireless base stations. As a combiner the unit will handle 40-W average and 1.3-kW peak RF input power, and as a divider will handle 80-W average power and 3-kW peak power.

Datasheet: 160-MHz Ultra-Miniature Log Amplifier
The ultra-miniature series of logarithmic amplifiers provide broadband performance and superb linearity over a wide temperature range. The UMSD range of logarithmic amplifiers are constructed in lightweight aluminum alloy housings and designed to withstand harsh mechanical environments.
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