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In wireless communications, a mobile device needs to track the base station frequency and time base very accurately. For example, in 3GPP GSM standard, the mobile carrier frequency has to track the base station with 0.1ppm accuracy. Along with this, the mobile time base cannot be more than 2μs...

To inhibit interference from WLAN in UWB front-ends, it is required to provide an effective band-stop filter with 5 to 6 GHz rejection band. Several typical configurations for providing rejection bands such as defect ground structure (DGS) [1], photonic band gap (PBG) [2], split ring resonator (SRR) [3], and...

The design of passive microwave functions, and especially filters, is a study domain of the most important interest. Indeed, with the widespread applications of communication systems, the bandpass filter is an essential component. Thus, the quality of filter is extremely important. The development of bandpass filters has emphasized high...

In July of 1958, a group of industry pioneers led by William Bazzy and including Ted Saad, Seymour Cohn, Henry Jasik, Ben Lax, Marshall Pease, Tore Anderson and Gersh Wheeler launched Microwave Journal . This year, we'll celebrate our 50th year milestone with a number of monthly print and...

Over the last five decades since the formation of the Microwave Journal, phased-array radars have seen remarkable advances and wide proliferation around the world. This is exemplified in Figures 1 , 2 and 3 , which give just a few examples of the phased arrays deployed over the last...

The modernized Global Positioning System Block IIR (GPS IIR-M) satellite launched from Cape Canaveral has been declared fully operational for military and civilian navigation users around the world, following a successful on-orbit checkout by a combined US Air Force (USAF)/Lockheed Martin team. The satellite, designated GPS IIR-17M, is the...

Northrop Grumman Corp. has received a follow-on contract from the US Army Communications and Electronics Command to provide soldiers additional Frequency Hopping Multiplexers (FHMUX) antenna systems. The primary function of the FHMUX is to reduce the number of antennas while providing RF isolation between multiple frequency hopping radios. The...

Harris Corp. has completed the transition of the Federal Aviation Administration’s (FAA) weather radar data in the continental US to the FAA Telecommunications Infrastructure (FTI) network, enabling air traffic controllers to receive a much greater volume of weather radar information faster then ever before. The Weather and Radar Processor...

Raytheon Co. has successfully flight-tested a key component of the Network Centric Airborne Defense Element (NCADE) missile-defense system with the intercept of a test ballistic missile. The test at White Sands Missile Range, NM, demonstrated the NCADE’s infrared seeker’s ability to acquire and track a ballistic missile target in...

Trusted Borders, a consortium of companies led by Raytheon Systems Ltd. of the UK and including QinetiQ, has signed a contract with the UK Home Office to develop and implement the nation’s e-Borders project, an advanced border control and security programme. Work has already begun, building upon the country’s...