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Passive Components

Ferrite Circulator Switches and Their Applications

November 1, 2003
When looking for a coaxial microwave switch that can handle moderate power levels, the options considered are likely to be a PIN diode switch or an electromechanical switch. Both of these switch types have been well engineered over the years, but still suffer from inherent disadvantages. The PIN diode...
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An X-band, Low Cost, LTCC Double-balanced Mixer

October 1, 2003
Double-balanced mixers are used extensively in transmitters and receivers. For frequencies above 5 GHz the designs are normally realized using strip line and microstrip techniques. This is because distributed element baluns become smaller in size and more attractive for design as the frequency increases. Semiconductor-based mixers are the most...
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A VSAT Packaged HPA for Ground Terminal and Digital Radio Applications

October 1, 2003
Two broadband satellite networks are in the final stages of development and plan a service launch for North America in early 2004. Systems like these are expected to provide wideband, high speed communications for Internet and multimedia applications across North America and Europe for years to come. High power...
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Adding a Low Data Rate Radio ASSP to an ISM Application

A variety of low data rate, low power and low cost radio ICs are available for use in industrial, scientific and medical (ISM) applications. A basic understanding of radio operation and the relevance of standard and proprietary protocol specifications ...
October 1, 2003
There is good news for those thinking about adding wireless communications to their industrial, scientific, or medical (ISM) application. A variety of low power, low cost radio ASSPs are available that can provide wireless features specifically for ISM applications. Fortunately, you do not need to be a communications specialist...
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A High Frequency Broadband Filter

September 1, 2003
X2Y® technology is a new balanced component capable of high frequency performance across a broad frequency range. The component uses a standard ceramic capacitor with subtle, but important modifications to its structure. These structural changes create a circuit inside the capacitor that is capable of broadband electromagnetic interference (EMI)...
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A 35 to 45 GHz Low Noise or Buffer Amplifier with Wide Dynamic Range

September 1, 2003
A versatile new three-stage buffer amplifier has been introduced that is ideal for use as a receiver front end low noise amplifier, but, as a result of its dual bias configurations, it can also be used as a driver amplifier or LO buffer with good linearity and higher gain....
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High Frequency Prescalers for Advanced Synthesizer Applications

August 1, 2003
Modern digital communications, instrumentation, electronic warfare and radar systems require high frequency and/or broadband synthesizers that are stable in frequency and exhibit low phase noise at frequencies up to 50 GHz. Prescalers are typically used in phase-locked loop circuits for these synthesizer applications. A prescaler converts the RF input...
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Miniaturized Ferrite Switch Networks

July 1, 2003
Ferrite switching networks have a wide variety of uses in commercial and military, space and terrestrial, and low and high power applications. These include low noise amplifier (LNA) redundancy switches, T/R modules, high power isolators and switch matrices. Ferrite switches are desirable for these applications due to their high...
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Precision Phase and Amplitude Matched IF Filters for Monopulse Radar

July 1, 2003
Monopulse (or simultaneous lobing) radars quickly gained popularity after their 1943 introduction by the US Naval Research Laboratories. Their principal benefit - the ability to obtain complete range, bearing, azimuth and elevation angle information from the return of a single pulse - is very appealing in applications such as...
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A Novel Class of High Selectivity Filters and Duplexers in Microstrip Technology

This article describes a novel configuration for high selectivity bandpass filters and duplexers in microstrip technology. The structure proposed is made of single-sided filters, which are characterized by requirements in one passband and one stopband,...
July 1, 2003
Modern communication systems often require narrow band filters presenting high selectivity and low insertion loss. When there are also stringent requirements on the overall dimensions of the filtering structure, it could become very problematic to select a suitable class of resonators having at the same time compactness and large...
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