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Experimental Adaptive Nulling with a Genetic Algorithm An adaptive antenna system rejects interference by placing a null in its antenna pattern in the direction of the interfering source. A single-element antenna needs at least one other element or some scattering object to form a null. Thus, adaptive antennas are...

Technical Feature Broadside Radar Echoes from Wires and Strings E.F. Knott, A.W. Reed and P.S.P Wei Please click here to view the pdf file of the Technical Feature...

A Novel Tapered Slot PCS Antenna Array and Model An antenna array comprising multiple tapered slot radiators and its microstrip feed network has the capability to be etched on a single piece of thin dielectric circuit board, resulting in the relatively inexpensive mass production of a highly consistent product....

Near-field Focusing of a High Field EMC Test Antenna This article describes a novel antenna for high field strength electromagnetic compatibility (EMC) susceptibility testing. The antenna system includes a small parabolic antenna and a set of five interchangeable feeds located laterally and axially off the reflector axis. The antenna...

Network Analyzer Measurements Mirin Lew Hewlett-Packard Co., Microwave Instruments Division Santa Rosa, CA Increased manufacturing throughput is one of the keys to achieving success in high volume, low cost markets such as wireless communications. As part of the manufacturing process, component and subsystem testing can either increase or decrease...

A Microstrip Patch Antenna Using Novel Photonic Band-gap Structures The microstrip patch is one of the most preferred antenna structures for low cost and compact design of wireless communication systems and RF sensors. However, as applications move to higher frequencies, conventional patch antenna designs encounter severe limitations such as...

COMPONENTS 2.3 - 2.6 GHz Directional Coupler The model DC25-73 directional coupler operates in the 2.3 to 2.6 GHz band for wireless messaging applications. The unit delivers low insertion loss at 0.2 dB along with good isolation and coupling repeatability. The coupler is available in a small SOT-6 lead...

MATERIALS Eyelet Packages These TO-25X type packages are designed for power controllers and power rectifiers with 75 percent less resistance than standard glass-to-metal packages. The units feature a ceramic eyelet brazed to low resistance copper alloy pins and copper alloy on the ground plane. All components are attached with...

ANTENNAS PCS-/DCS-/ISM-band Dual-patch Antennas These antennas provide for reception and transmission in the 1850 to 1990 MHz, 1710 to 1880 and 2400 to 2500 MHz frequency bands with a low profile design for minimum visual impact, making it a good choice for discreet antenna installations. The units provide gain...

AMPLIFIERS GPS LNA Diplexer This LNA/diplexer assembly designed for use in Global Positioning System (GPS) applications features a 1.8 dB (typ) noise figure for both the L1 and L2 channels. Typical gain is 55 dB and third-order intercept point (IP3) is +30 dBm. Additional features include an input limiter...