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Metamaterials ,1,2 with simultaneous negative permittivity and permeability, are promising materials for new types of microwave components. In metamaterials, the waves are propagating with anti-parallel phase and group velocities, as demonstrated by backward waves. 3 Recently, an extended transmission-line approach to metamaterials, low loss and broadband structures was proposed...

Microwave Downconverter The model PN9276 is a 40 GHz microwave downconverter that provides the combination of high bandwidth with low noise performance. This model is designed for radar, commercial wireless, satellite terrestrial microwave links and calibration labs. This downconverter plugs into any PN9000 phase noise analyzer or PN9500 wideband...

The Wilkinson divider has long been popular with RF designers. In recent years, off-the-shelf, surface-mount technology (SMT) components of this type have become available and provide tremendous cost savings in high volume pick and place manufacturing. Some of its applications are found in power amplifier design and modern communication...

Military tactical communications require transportable radio systems that can be set up quickly in the field, under difficult conditions, to establish communication links. These radio systems are mounted in tactical operation centers (TOC), vehicles and shelters. Legacy antennas used in these systems operate primarily in the VHF or UHF...

This is a survey article summarizing the recent developments and future trends in passive, active, bipolar and monolithic microwave integrated circuitry (MMIC) phased arrays for ground, ship, air and space applications. Covered is the DD(X) ship radar suite; THAAD (formerly GBR); European COBRA; Israel BMD radar antennas; Dutch shipboard...

The emerging ultra-wideband (UWB) radio is the technology for transmitting and receiving short, information-encoded, electromagnetic impulses. 1,2 UWB technology is loosely defined as any wireless transmission scheme that occupies a bandwidth of more than 25 percent of a center frequency, or more than 1.5 GHz. According to the Federal...

Microstrip patch antennas (MPA) 1–5 and dielectric resonator antennas (DRA) 6–7 have been studied extensively. They share the advantages of low profile, lightweight, ease of fabrication and are easy to excite by different methods. Both antennas are viable candidates for numerous applications, either as individual elements or in an...

Slot antennas have been investigated since at least the 1940s 1 and are treated in many textbooks on electromagnetism. In these antennas, the feeding method generally uses a microstrip line crossing the center of the slot. However, this method increases the radiation resistance, which makes the impedance matching difficult....

The conventional printed wide-slot antenna has an operating bandwidth on the order of 10 to 20 percent. 1,2 Because modern wireless applications often require broadband operation, some printed wide-slot antennas for broadband operation have been reported. 3-6 A square slot antenna,3 with a fork-shaped microstrip feed structure, was investigated...

Carl Sheffres It seems only fitting to recognize the Chinese New Year, with all of the attention being paid these days to the Asian market. Greater China has evolved into the most dynamic market in the world, with vast implications for the microwave industry. With that in mind, Microwave...