Microwave Journal articles from January 1999

Microwave Journal archives from January 1999

2.4 GHz LNA/PA/circularly polarized active microstrip antennas.(low-noise amplifier; power amplifier)
January 1, 1999... Recently, active integrated antennas have received much attention as a result of their compact size and lower cost when used in transmitting and receiving systems.[1] Active microstrip antennas that integrate printed patch antennas with active...

A microstrip patch antenna using novel photonic band-gap structures.
January 1, 1999... Printed antennas exemplified by the microstrip patch antenna offer an attractive solution to compact, conformal and low cost design of modem wireless communications equipment, RF sensors and radar systems. Recent applications have pushed the...

Experimental adaptive nulling with a genetic algorithm.
January 1, 1999... Most approaches to nulling using adaptive antennas fall into four categories. The first category requires a receiver at each array element. This approach forms a correlation matrix from the signals at each element and inverts the matrix to...

A novel tapered slot PCS antenna array and model.(Personal Communications Systems)
January 1, 1999... The tapered slot antenna (TSA) is a wideband element that performs extremely ell in PCB applications. This element has also been referred to as a notch or Vivaldi antenna. The antenna consists of a microstrip-to-slotline transition (often...

Broadside radar echoes from wires and strings.
January 1, 1999... The Boeing Company has been an innovator in the use of string support systems for RCS measurements since the late 1970s when the company constructed its ram-wave test chamber.[1] The most notable implementation of string support systems has...

Testing of smart antenna systems.
January 1, 1999... Several smart antenna systems have been deployed or are still under development at base stations in wireless communication networks all over the world. This article discusses the important issue of testing smart antenna systems before they are...

Test equipment synchronization: problems and solutions.
January 1, 1999... With the introduction of CDMA it has become clear that plain old CW scanning receivers do not serve well for network planning. The deployment of CDMA emphasizes even stronger demand for specific tools to set up new networks and troubleshoot...

Network analyzer measurements.
January 1, 1999... 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...

Near-field focusing of a high field EMC test antenna.(electromagnetic compatibility)
January 1, 1999... The world is populated increasingly by wireless, radar, satellite uplink and other microwave radiating systems. Regulatory bodies now require equipment designers to test electronic equipment for electromagnetic susceptibility at progressively...

A low cost, 1200 MHz frequency synthesizer.
January 1, 1999... As wireless production expands, test systems requiring high performance LO sources are proliferating. To address the price pressures found in the wireless market, a new low cost synthesizer that features fast switching and low phase noise...

A 2 kW solid-state pulse amplifier.
January 1, 1999... The model WPA-129063-53PR solid-state power amplifier system is a standalone, 19[inches] rack-mount unit, capable of amplifying RF pulses to a level in excess of 2000 W peak power with five percent duty cycle (100 W average power). Control and...

A miniature SPDT switch for hi-rel space applications.
January 1, 1999... The trend toward component miniaturization is not new; it has already become prevalent in the commercial industry, especially in the wireless sector. However, the space industry is more conservative and, although there is good reason to rely on...

Dual-band GSM/PCS handset antennas.
January 1, 1999... Today's new cellular telephone must be capable of operating in two distinct frequency bands to be compatible with the various operating systems it is likely to encounter. As a result, the unit's single-handset antenna must perform efficiently...

A DC to 35 GHz mm-wave MMIC package.
January 1, 1999... One of the potentially gating issues for implementing MMIC die in high volume commercial and consumer markets is the determination of known good die. It is difficult to reliably RF test the die in wafer form, and testing packaged devices in the...