Microwave Journal articles from March 1998

Microwave Journal archives from March 1998

Measurement of RF dielectric properties with series resonant microstrip elements.
March 1, 1998... With the growth of the cellular telephone market and the expansion into the personal communications service (PCS) band, the need for an expanded supply of high performance, high frequency PCB materials has become critical. This article discusses...

Applying error correction to network analyzer measurements.
March 1, 1998... Designers and manufacturers use network analysis to measure the electrical performance of the components and circuits destined for use in more complex systems. When these devices convey signals with information content, designers and...

Cold War to counter drug. (the relocatable over-the-horizon radar as a highly effective counter-drug system)
March 1, 1998... A small twin-engine airplane flies low over the water to avoid radar detection. At an undisclosed Caribbean airfield, two men waiting by a truck signal that it is all clear to land. The plane lands and the men quickly begin to offload its cargo....

Near-field mapping above a coupled-line filter and a MMIC.
March 1, 1998... Most standard testing techniques for characterizing MMICs involve on-wafer probing where the device under test (DUT) is contacted at several ports outside the circuit. S-parameter measurement systems have been demonstrated tip to W-band with...

Noise figure, antenna temperature and sensitivity level for wireless communication receivers. (part 1)
March 1, 1998... Noise figure is used as a figure of merit to describe the amount of noise added to an RF signal passing through a component with an input and output port. All components add noise to the signal, leading to a decreased signal-to-noise ratio (SNR)...

The pulse desensitization factor.
March 1, 1998... It is well understood that the occupied spectrum width of a pulsed signal is inversely proportional to pulse width, accompanied by an associated reduction in spectrum level as the spectrum width increases. In Fourier analysis, this phenomenon is...

Negative-resistance device measurements.
March 1, 1998... This article addresses the vector network analyzer (VNA) measurement of devices that exhibit large negative resistance (reflection coefficients [absolute value of [S.sub.ii]] [greater than] 1) at one or more of the devices' ports. These...

Spectrum analyzers for high frequency point-to-point and point-to-multipoint networks.(Cover Story)
March 1, 1998... The world of microwave radio continues to add exciting opportunities to the telecommunications market. With the advent of digital microwave technology, manufacturers now are providing point-to-multipoint systems that offer digital voice and data...

System design, simulation and analysis software.(Evaluation)
March 1, 1998... A new comprehensive PC-based software package has been developed specifically to support all aspects of system sign. SystemView[R] is a complete visual design environment for dynamic system design, simulation and analysis. The software suite...

A GPS frequency and time standard. (Global Positioning System)(Evaluation)
March 1, 1998... The Global Positioning System (GPS) is used widely to determine location. If at least four of the system's satellites are in view (typically six or seven are in view at one time), position can be determined in four dimensions, including...

A PC-based high frequency electromagnetic structure simulator.(Evaluation)
March 1, 1998... Three-dimensional (3-D) electromagnetic simulations of high frequency structures have been both time consuming and costly, running lengthy calculations on sophisticated workstations using expensive software. A new, inexpensive software package...

A 2 GHz hand-held RF field strength analyzer.(Evaluation)
March 1, 1998... In today's complex world of wireless communications systems it is sometimes necessary to determine a transmitter's radiated field strength in actual field operating conditions. This strategy requires portable testing in the field, which may be...