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Passive Components

High Power Surface-mount Circulators and Isolators

February 1, 2003
Non-reciprocal ferrite devices are widely used in RF engineering as efficient means for rerouting and suppressing reverse signals. Ferrite devices for various applications are currently available for the entire microwave frequency band. However, the expanding utilization of RF and microwaves in wireless cellular and satellite communication systems revived the...
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A Modular Switch Filter Bank

A new modular switch filter bank is featured
February 1, 2003
For many years switch filter banks have been designed as custom RF assemblies with long lead-time, large NRE charges and extreme custom packaging and specifications. A new modular approach to switch filter bank design has been introduced that provides the design engineer with the opportunity to maintain a custom...
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A Low Noise Wideband Microwave Oscillator Using a Tunable Microstrip Combline Filter

In RF measurement equipment, microwave synthesized signal sources, broadband digital satellite receivers and many other applications, broadband and low phase noise oscillators are becoming more and more important. A wide tuning range and good phase noi...
February 1, 2003
Typical oscillator designs use a common-base or common-collector circuit for generating a negative resistance at one port, which is usually terminated with a parallel or series LC-resonant circuit. The main problems in this design are the bandwidth of the negative resistance, which cannot be easily extended over one frequency...
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A 28 GHz 2 x 16 Antenna T/R Switch Matrix

January 1, 2003
Fabricating a high performance 2 x 16 transmit/receive (T/R) switch to feed a millimeter-wave Rotman or Lunenburg lens antenna array has in the past been a complex and space-consuming configuration. A new T/R switch assembly has been designed that features a compact, unique package containing a 2 x 16...
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Interactive Interdigital Filter Design Using MMICAD Software

January 1, 2003
Successful microwave circuit realization requires flexible circuit analysis tools that allow engineers to prototype, analyze and verify their circuits. Today, available software tools offer standard features such as frequency analysis, tuning and optimization, but are differentiated by their model libraries and special customization capabilities. This article describes the design...
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Practical Design Consideration of a Modified Structure for a Planar Multiport Power Divider at 2 GHz

This article proposes a modified structure at 2 GHz of IMT-2000 for the planar multiport power divider published in the literature.<sup>8-10</sup> Design parameters for the practical realization of the structure have also been investigated using HFSS (...
November 1, 2002
A power divider is a basic microwave and millimeter-wave circuit dividing the input RF power by an arbitrary ratio. This circuit has a wide range of applications such as antenna systems, power amplifiers, power oscillators, balanced mixers and so on. Multiport power dividers/combiners have been used in power amplifiers...
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Considerations in Capacitor-pairing to Obtain Nonstandard Part Values

November 1, 2002
Series- and parallel-combining of surface-mount capacitors is a standard approach to realize semi-arbitrary capacitance when designing a printed circuit board layout. This pairing of components is often necessary as surface-mount parts are available in only a limited number of fixed values, such as 0.5, 1.0, 2.0 pF. This article...
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An LTCC Double-balanced Mixer

October 1, 2002
Double-balanced mixers are used extensively in transmitters and receivers. For frequencies below 5 GHz, the designs are normally realized using ferrite-based transformers, because they are very compact and their technology is mature. As the operating frequency increases, distributed element baluns become smaller in size and more attractive. Semiconductor-based mixers...
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Specifications and Definitions for Quadrature Demodulators and Receiver Design Measurements

This article discusses the common and questionable definitions of the specifications for quadrature demodulators, including gain, intercept point and noise figure. Emphasis is on the mapping between single-tone measurement data and the modulated signal...
October 1, 2002
The quadrature demodulator is used in either heterodyne or homodyne receivers. In commercial communication receivers, the local oscillator frequency ranges from a few kilohertz to a few gigahertz. It is usual to test the individual part with a single tone to avoid the complexity of the baseband waveform. The...
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Reviewing the Basics of Suspended Striplines

Suspended striplines are widely used for several reasons. They provide high Q-factor, wide bandwidth and good temperature stability. This tutorial reviews some of the basic principles and new concepts for suspended striplines.
October 1, 2002
There are several reasons for the wide use of printed transmission lines. They are simple to produce, they operate over a wide bandwidth, and have small weight and dimensions. The earliest form of printed transmission lines was the stripline ( Figure 1a ). 1,2 The printed stripline consists of...
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