RF & Microwave Industry News

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A Digitally Compensated Phase Shifter COMSAT RSI, Anghel Laboratories Rockaway, NJ Developing a phase shifter that produces a constant or flat phase response with respect to frequency is difficult. Networks that exhibit this type of behavior are narrowband and must be optimized for each specific frequency and desired phase...

Multiband Linear Power Amplifiers ITS Electronics Inc. Concord, Ontario, Canada A family of wideband linear power amplifiers have been developed to service cellular/PCS applications as well as electronic warfare (EW)/electronic countermeasures (ECM), local multipoint distribution service and active load pull applications. The amplifier models cover four basic frequency ranges...

An Affordable Harmonic Load Pull Setup Focus Microwaves Inc. Ville St. Laurent, Quebec, Canada Since the early days of semiconductor amplifier design when bipolar transistors were used, it has been common knowledge that short-circuiting the second and third harmonic frequencies with the correct phase at the output of a...

A Flexible Upconverter/Signal Generator to Support Communication and Radar Systems Communication Solutions Inc. Baltimore, MD As modulation formats become more complex and communication and radar systems push the edge of technology, timely and cost-effective maintenance of these systems requires sophisticated test equipment. Wider bandwidth, AM and FM modulation, and...

Third-generation Wireless Test Equipment Requirements Rob Van Brunt Telecom Analysis Systems Inc. Eatontown, NJ Although the technology rollout is still several years away, development of third-generation (3G) wireless systems is well under way. During this critical development phase, manufacturers are making strategic decisions on the most appropriate modulation, protocol...

Current Techniques for Tuning Dielectric Resonators Electronic tuning of dielectric resonators over a relatively wide range while also preserving their characteristics is highly desirable, especially for use in nonaccessable systems such as airborne or spaceborne systems or in areas of high sophistication such as cellular radio systems. This article...

The Age of the Precision Oscillator: The Role of the TCXO and DCXO Bill Jennewein M-tron Industries Inc. Yankton, SD The need for quality, high precision timing devices is increasing daily. The heart of all communications is linked directly to a stable and dependable source of frequency control. Computer...

COMPONENTS SP4T Nonreflective Switch The model AS115-61 high isolation, SP4T nonreflective switch operates with 0 and -3 V or -5 V over the DC to 2 GHz frequency range. The switch delivers low insertion loss of 0.7 dB at 0.9 GHz with high isolation of 50 dB at 0.9...

MATERIALS Low Loss Dielectric Materials The ECCOSTOCK" series low loss dielectric materials for microwave applications feature dielectric constants ranging from 1.04 to 30 with loss tangents of < 0.002. The material is effective in antennas as a lens and in patch antennas as the spacer dielectric. It is also...

SYSTEM 800 MHz Data Transceiver The model DT800 800 MHz data transceiver operates over a frequency range of 806 to 866 MHz with an operating temperature range of -30° to +60°C. Additional features include a 25 W output power, forward error correction, data interleaving for burst error protection, high...