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Industry News

An Equivalent Circuit and Modeling Method for Defected Ground Structure and Its Application to the Design of Microwave Circuits

In this article, the equivalent circuit and modeling method for a defected ground structure (DGS) is proposed, to be used in the design of a microwave circuit. Using the proposed equivalent circuit permits the optimization of the DGS circuits. Simulati...
Recently, there has been an increasing interest in studying microstrip lines with various periodic structures that prohibit wave propagation in certain frequency bands, including photonic bandgap (PBG) and DGS. 1-10 Each periodic structure has its own properties and advantages. DGS, which is realized by etching only a few areas...
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A Diode Linearizer for Microwave Power Amplifiers

The performance of communication systems, in both space and ground segments, is degraded by the nonlinearity of the power amplifiers that are operated in saturation to obtain higher efficiency. Linearizing is the technique used to improve the performance of communication systems when power amplifiers are operated in saturation. The...
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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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Recent Advances in EDA Software Solutions for Improved RFIC Design Flows

Today's wireless world requires unrelenting technological innovation. From cell phones that take and send photos to homeland security, the demands on wireless designers for increasing complexity at lower prices and faster time-to-market are immense. Advances in electronic design automation (EDA) over the last decade have made possible dramatic improvements...
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A Two-path Vector Signal Generator

Setting new standards in flexibility and performance and opening the possibility for new applications, the R&S SMU200A is said to be the first high end generator to combine two complete digital signal generators with modulation capabilities in one instrument. It provides space for up to two RF paths in...
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A Nonlinear Model Compiler for RF/Microwave Engineers

Models make or break the accuracy of a simulator. Although modern simulators have a wide range of models, device technology continually evolves, requiring new ones. Creating linear models is easy and straightforward. Nonlinear models, however, have been so difficult to create that engineers are often forced to live with...
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Ask Harlan: December 9, 2003

ASK HARLAN YOUR RF & MICROWAVE TECH Q&A RESOURCE You may know Harlan Howe from his twelve years as publisher and editor of Microwave Journal ®, or from his 34 years as a Microwave design engineer and engineering manager, or from his service as an IEEE fellow and past...
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