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Industry News

Subminiature Broadband Coaxial Switches for VXI Applications

In recent years the VXIbus architecture has proven to be a versatile interface standard for instruments from many diverse manufacturers to operate within the same mainframe. The VXIbus incorporates the user-friendly features of instruments designed to operate within the General Purpose Interface Bus (GPIB) (for example, using ASCII-level programming)...
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Chip Terminations with Integrated Matching for Improved VSWR

Matching microwave to components within a circuit has become more challenging for the circuit designer as operating frequencies and circuit complexity increase. Increasing use of thick film and thin film resistors as 50 terminations has answered the increased need for microwave circuit components in various wireless and telcom applications....
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MMIC LNAs for Wireless Infrastructure Applications

Wireless infrastructure designers must often contend with conflicting goals when developing new equipment for the base transceiver station (BTS) market. The components used in today's systems are frequently required to operate over multiple bands and under multiple modulation formats. The quest for higher performance, lower cost, component interchangeability and...
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High Performance UMTS Circulators and Isolators

The data rate evolution necessary to meet new mobile telecommunication standards (9.6 kb/s for GSM, 115.2 kb/s for GPRS, 384 kb/s for EDGE and 2 Mb/s for UMTS) demands the use of wider bandwidth and bandwidth-efficient linear modulation techniques. Therefore, telecommunication manufacturers require improved specifications for 3G standards. In...
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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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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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