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December 2011 Spatial Combining Creates Linear Power Microwave power at appreciable levels is usually associated with vacuum tube devices, such as traveling wave tubes (TWTs). — Jack Browne November 2011 ransistors Pick Up Speed With GaAs — Jack Browne 50th Anniversary Issue Reflecting On RF/MW Component Advances Components are like building blocks for RF/microwave systems. — Jack Browne 50th Anniversary Issue Helping Receivers Mature At GEC's HRC Microwave receiver technology has undergone dramatic improvements since the 1940s, with perhaps no organization contributing as much to these advances as the General Electric Company (GEC) Research Laboratories. — T.H. Oxley October 2011 New Tacks Are Taken To Roll Out 4G Infrastructure Fourth-generation (4G) cellular service has begun to roll out in earnest. — Janine Love October 2011 Preventing High PIM Distortion Intermodulation (IM) occurs when multiple signals in a transmission path act on each other. — Jack Browne October 2011 Designing For Outer Space Space-based systems such as satellites require extremely reliable components. — Jack Browne October 2011 Novel Topology Supports Wideband Passive Mixers Choices for frequency mixers capable of wide spurious-free dynamic range (SFDR) and broadband performance are often limited. — September 2011 Choosing Military Or COTS Components? Economic conditions can assert influence over electronic design strategies. At one time, the US government steered clear of commercial components or software in electronic defense systems. — Jack Browne August 2011 Linearize Power Amps With RF Predistortion Linearity is a key to multimode, multicarrier wireless networks, including wideband third-generation (3G) and fourth-generation (4G) cellular systems, including small cellular base stations with reduced coverage areas and low transmit-power architectures. The spotlight is on RF/microwave power amplifiers (PAs) to deliver the required performance at low cost and low system power consumption. Unfortunately, PAs are not typically linear in behavior, and cost-effective... — Mendy Ouzillou July 2011 Switching RF And Microwave Signals Switches control signal flows in RF/microwave circuits. They provide signal routing through a number of different configurations and technologies, and are characterized by many different parameters for comparison, including frequency range, insertion loss, switching speed, power-handling capability, power consumption, linearity, and on/off isolation. They can be as simple as a single-pole, single-throw (SPST) device to a complex multithrow switch or switch matrix. Selecting an RF switch is a... — Jack Browne July 2011 Multifunction Modules Save Integration Time Multifunction modules save space, time, and engineering effort for system integrators. — Jack Browne May 2011 MM-Wave Signals Serve Cell Sites Millimeter-wave components and technology have long been associated with radiometry and secure point-to-point communications. But as the means to generate and detect signals at frequencies above 30 GHz become more practical, the uses for millimeter-wave components and subsystems become more widespread. Credit can be given to improved measurement capabilities as well as to the enhanced capabilities of electromagnetic (EM) simulation software tools. As... — Jack Browne April 2011 Wireless Infrastructure Keeps Pressure On Amplifiers And Oscillators Amplifiers and oscillators have always fueled the “microwave fire.” Yet the needs of wireless communications infrastructure in particular are now pushing the limits for both types of components. designers must provide performance that beats, rather than just meets, the latest wireless specifications. At the same time, costs are sensitive and companies must simplify the design process as much as possible. This trend translates into flexibility with products that can meet the... — Nancy Friedrich March 2011 Passive Components Shrink With Time PASSIVE COMPONENTS, like many other building blocks in the high-frequency industry, have improved in terms of electrical performance per unit size over the last fi ve decades. When looking back over the years at earlier passive components and assemblies, it is not so much the pure electrical performance that is striking as much as the advances in packaging that have taken place over that time. In 1980, for example, one of the leading suppliers of... — Jack Browne March 2011 Sorting Through Filter Design Software Microwave filters are among the most essential of high-frequency components, necessary for keeping signals separate in applications ranging from communications to radar systems. High-frequency filters come in many shapes, sizes, and response types, including bandpass, bandstop, lowpass, and highpass filters. They may be simple in concept, but the performance of a filter design is affected by many parameters, from the widths of transmission lines to the... — Jack Browne March 2011 Evaluating Effects Of Passive Intermodulation Passive Intermodulation (PIM) is a nonlinear effect in passive components, including cables and connectors, which can degrade communications system performance. Te intermodulation occurs between two or more signal tones at sufficiently high power levels, and results in the generation of additional tones which can appear as signals or interference within a communications system. Although the levels of PIM products are usually low compared to... — Jack Browne December 2010 Specifying Mixers And Prescalers Microwave mixers and pre-scalers are designed to translate signals from one frequency to another, but they work in different ways and are used in quite different applications. At present, specifiers for these products have an unprecedented choice of both kinds of components in a variety of technologies and package types. Knowing the basics of how each type of component works and they key specifications to compare them can help when deciding on... — Jack Browne December 2010 Tiny Antenna Arms UWB Applications Portable wireless applications employing ultrawideband (UWB) frequency coverage require antennas that are small in size but capable of the broad frequency ranges in such systems. By using a quasiself- complementary structure with coplanar-waveguide (CPW) feed and tapered radiating slot, a miniature antenna was developed measuring only 18 x 16 x 1.6 mm for ease of installation in portable wireless devices. By means of discovering an optimized curvature... — Jie Jin , et al. December 2010 Design A Stable 14-To-20-GHz Source Frequency synthesizers provide the local oscillator (LO) signals as well as transmit signals in many communications networks. They must be stable, with low phase noise and good spectral purity, to support the complex modulation formats that are now common to many wired and wireless communications networks. To serve as a signal source in such networks, a low-noise frequency synthesizer capable of tuning from 14 to 20 GHz (Ku-band operation) was... —  prev. page
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