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Typical oscillator designs use a common-base or common-collector circuit for generating a negative resistance at one port, which is usually terminated with a parallel or series LC-resonant circuit. The main problems in this design are the bandwidth of the negative resistance, which cannot be easily extended over one frequency...

Multiple RF exciters feeding a broadband power amplifier and a broadband antenna system has become an increasingly popular form of system architecture throughout the frequency spectrum. This architecture, shown in Figure 1 , has several desirable features, the most popular of which is the reduced real estate requirement. Modern...

For about half a century the suppression effects of bandpass hard limiters on various combinations of signals and interference have attracted widespread interest. 1-4 Certain "rules of thumb" have accreted around a variety of theoretical results. The purpose of this article is to revisit issues of interpretation and to...

In the design of high frequency power amplifiers, one of the parameters is the stability of the active device. The stability of the active device is determined by the Rollet stability factor K. If K > 1, then the active device is unconditionally stable and the design of the...

Ultra-wideband (UWB) radio technology enables several important applications, including ground penetrating radar, imaging, location tracking and low cost, short-range communications. With the recent Federal Communications Commission (FCC) approval of rules for operation of UWB devices under Part 15, devices aimed at these, and possibly other, applications will soon be...

Frequency synthesizers are used in a variety of communications and timing systems. Phase-locked loops (PLL) have been the "workhorse" of the majority of traditional synthesizers and clock generation circuits. However, there are other types of synthesis blocks available such as direct digital synthesizers (DDS), mixers, frequency doublers and dividers...

Rockwell Collins is the first to receive Federal Aviation Administration Technical Standard Order approval for a Multi-mode Receiver (MMR) equipped with Microwave Landing System (MLS) functionality that can be implemented in both commercial and military aircraft. Collins MMR is an integrated unit providing VHF Omni-directional Range (VOR), Instrument Landing...

Lockheed Martin's Army Tactical Missile System (ATACMS) Block II Missile performed perfectly in a test at White Sands Missile Range, NM. The missile was launched with a test payload of three fully tactical Brilliant Anti-Armor Technology (BAT) submunitions, three flight data recorders and seven BAT simulants. The cold-conditioned ATACMS...

Raytheon Co. has completed its initial delivery of Patriot Guidance Enhanced Missile Plus (GEM+) forebodies to the US Army. GEM+ is a significant upgrade over the existing Patriot Advanced Capability -2 (PAC-2) missile and, when fielded in conjunction with the PAC-3 System, provides a robust capability against ballistic missiles,...

Rockwell Collins is the first to demonstrate low level military approaches using synthetic vision technology. Rockwell Collins' synthetic vision technology offers enhanced situational awareness, real-time guidance, predictive alerting and improved flight planning. The successful flight tests are the culmination of a two-year cooperative research agreement with the Air Force...