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Passive Components

Design and Evaluation of a High Selectivity Combline Bandpass Filter

Quasi-planar combline bandpass filters have been realized in suspended substrate stripline. The coupling between non-adjacent resonators and the composite effect of N quasi-TEM modes excited from N-coupled lines are considered. The design approach is b...
Advances in MIC and MMIC technology have motivated the demand for compact, high performance filters, diplexers and multiplexers used in microwave receiver systems. Combline bandpass filters have been in great demand because of their structural compactness and excellent wide stop-band performance. They are easy to fabricate in printed circuit...
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A Deterministic Method for Optimizing VSWR

By using in conjuction both frequency and time domain reflection measurements, it is possible to positively identify the specific circuit discontinuities that contribute to a given VSWR lobe. Corrective action can then be readily determined for optimum...
Improving VSWR is typically an iterative trial-and-error exercise when utilizing either frequency or time domain information. For example, while circuit modifications which decrease time domain reflectometry (TDR) "bumps" (discontinuities) are generally a good thing, decreasing a specific TDR bump does not necessarily improve VSWR within a frequency band of...
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100 W Hot Switching Programmable Attenuators

In order to test high power amplifiers used in today's cellular base station equipment it is sometimes necessary to perform automated switching of the high power amplifiers without shutting down the system to make the RF connection. The high power RF signal must be diverted from the main signal...
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Ferrite Circulator Switches and Their Applications

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

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

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 ...
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

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

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

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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