MWJ China MWJ China

RF & Microwave Industry News
RF & Microwave Industry News RSS Feed RSS

Single-carrier Power Amplifiers for GSM Applications

High power amplifiers that employ laterally diffused metal oxide semiconductor devices and meet or exceed the stringent GSM 05.05 requirements
March 1, 1999
AML Communications
0 Comments
Single-carrier Power Amplifiers for GSM Applications AML Communications Inc. Camarillo, CA As the sophistication of GSM has evolved, the demands for ever-increasing data rates have imposed new design challenges for high power, single-channel amplifiers. In order for a power amplifier to meet the stringent requirements of the GSM 05.05...
Read More

Radiated Emissions Measurements Using an EMI Receiver

Radiated emissions measurements and guidelines to optimize measurement performance using an electromagnetic interference (EMI) receiver
March 1, 1999
Andrew Ware
0 Comments
Radiated Emissions Measurements Using an EMI Receiver Andrew Ware Hewlett-Packard Co.,Santa Rosa Systems Division Santa Rosa, CA Electronic products designed for global markets must meet both national and international standards for electromagnetic compatibility (EMC). Measurements based on these standards fall into two basic categories of electromagnetic (EM) testing: radiated...
Read More

Network Analyzer Calibration for Measurements Near the Waveguide Cutoff Frequency

Confirmation of the TRL calibration technique as the preferred method since the accuracy of its corrected scattering coefficient results remain consistently good over the 6.6 to 12.4 GHz bandwidth for WR90 waveguide
March 1, 1999
S.P. Yeo and M. Cheng
0 Comments
Technical Feature Network Analyzer Calibration for Measurements Near the Waveguide Cutoff Frequency S.P. Yeo and M. Cheng Please click here to view the pdf file of the Technical Feature...
Read More

A Sub 1 W Load-pull Quarter-wave Prematching Network Based on a Two-tier TRL Calibration

A vector network analyzer error-correction characterization technique based on a two-tier calibration using 7 mm and microstrip thru-reflect-line (TRL) calibrations
March 1, 1999
John F. Sevic
0 Comments
A Sub 1 W Load-pull Quarter-wave Prematching Network Based on a Two-tier TRL Calibration Transistors used for cellular and PCS infrastructure applications are required to amplify signals with a peak-to-average ratio that can exceed 13 dB, resulting in a peak envelope power (PEP) approaching 1 kW. This PEP requirement...
Read More

Miniaturized Low Cost 30 GHz Monolithic Balanced BPSK and Vector Modulators: Part 1

The advantages of using direct carrier modulation at mm-wave frequencies as well as the active device characterization and detailed circuit analysis of both single-stage and balanced modulators
March 1, 1999
A.E. Ashtiani, T. Gokdemir, G. Passiopoulos, A.A. Rezazadeh, S. Nam and I.D. Robertson
0 Comments
Technical Feature Miniaturized Low Cost 30 GHz Monolithic Balanced BPSK and Vector Modulators: Part 1 A.E. Ashtiani, T. Gokdemir, G. Passiopoulos, A.A. Rezazadeh, S. Nam and I.D. Robertson Please click here to view the pdf file of the Technical Feature...
Read More

Measurement of a Small Signal Near a Large Signal Using a Spectrum Analyzer

Factors to be considered to determine the measurement limitations of a small signal in the presence of a large signal
March 1, 1999
Morris Engelson
0 Comments
Measurement of a Small Signal Near a Large Signal Using a Spectrum Analyzer   Morris Engelson JMS Consulting Portland, OR A number of factors are involved in determining whether a small signal can be measured in the presence of a larger signal using a spectrum analyzer. The type of...
Read More

Improvement of a Cassegrain Antenna by Secondary Surface Corrections

A method to correct for the phase front distortions in the aperature field caused by the main mirror deformations in a large Cassegrain antenna
March 1, 1999
Juan Eusebio Garrido Arenas, Alberto Barcia Cancio and Jose Manuel Paez Borrallo
0 Comments
Technical Feature Improvement of a Cassegrain Antenna by Secondary Surface Corrections Juan Eusebio Garrido Arenas, Alberto Barcia Cancio and Jose Manuel Paez Please click here to view the pdf file of the Technical Feature...
Read More