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TECHNICAL FEATURE SIMULATION OF INTERDIGITATED STRUCTURES USING TWO-COUPLED-LINE MODELS Abstract: Some commercial microwave CAD programs do not incorporate models for more than three coupled lines. This fact is especially critical in the design and analysis of multiple-line planar structures, such as interdigital, combline and hairpin filters, meander lines, spiral...

TUTORIAL LOW NOISE VCOS: KEY COMPONENTS FOR BASE STATIONS FRANK BABERG Tekelec Temex Munich, Germany   The great economic success of modern mobile radio systems such as GSM and the digital communication system (DCS) means even greater utilization of the capacity of existing channels. Therefore, it is immensely important...

TECHNICAL NOTE FRACTIONAL OUT-OF-BAND POWER FORMULAS FOR BPSK, QPSK AND MSK FRANK AMOROSO Consultant Santa Ana, CA   Fractional out-of-band power (FOBP) has for some time been a standard metric of spectral containment for digital data signals.1 For any given modulation scheme the FOBP can be measured experimentally or...

News From Washington F/A-18 Radar Production Contracts Awarded Raytheon Co. has received two contract awards for the production of the AN/APG-73 radar for installation in US Navy, US Marine Corps and Royal Australian Air Force (RAAF) F/A-18 aircraft. An award from the Boeing Co. totals approximagely $467.2 M and...

International Report Thomson-CSF Wins BIFF Contract French contractor Thomson-CSF Comsys has been awarded a Euro 38 million contract covering the production of 1500 Battlefield Identification Friend-or-Foe (BIFF) systems for France's armed forces. As currently structured, the French BIFF effort anticipates acquisition of 5400 units in three production lots. The...

Commercial Market Hong Kong Telecommunications Market Opens Up The Hong Kong government has opened up its telecommunications market by granting fixed network licenses to five companies and the right to operate international satellite services to 12 other applicants. PSINet HK Ltd., HKNet-Teligent Company Ltd., HK Broadband Network Ltd., Eastar...

The Book End The Essential Guide to RF and Wireless Carl J. Weisman Prentice Hall PTR 232 pages; $34.99 ISBN: 0-13-025962-4 Here is a book on RF and wireless components and systems that is strictly intended for a nontechnical audience. It has two simple objectives: to provide a conceptual...

Ultra-high Linearity GaAs Mixers Infineon Technologies AG Munich, Germany Mixers are common devices in modern communication and signal processing systems. They can serve as up- and downconverters and are combined in modulators for different balanced or unbalanced configurations. Current consumption, IP3 performance and conversion loss are critical factors in...

Ultra-high Stability Miniature OCXOs MTI-Milliren Technologies Inc. Newburyport, MA The current drive for miniaturization and low cost commercialization is also affecting oven-controlled crystal oscillator (OCXO) products. Although burdened by a discrete oven that stabilizes the crystal oscillator’s thermal environment, modern OCXO designs must be smaller and less expensive than...

Electronically Tunable RF Filters for LMDS Frequencies Paratek Microwave Inc. Columbia, MD Local multipoint distribution service (LMDS) is a two-way digital wireless communication medium enabling voice, data and video traffic. LMDS applications are located in the 22 to 40 GHz range of the spectrum and provide an attractive solution...