Application of a simplified real-frequency synthesis method to distributed-element amplifier design

1991 ◽  
Vol 1 (4) ◽  
pp. 365-378 ◽  
Author(s):  
R. Soares ◽  
A. Perennec ◽  
A. Olomo Ngongo ◽  
P. Jarry
Keyword(s):  
Synthesis Method ◽  
Frequency Synthesis ◽  
Real Frequency ◽  
Amplifier Design

scholarly journals Compact Reflectometers for a Wideband Microwave Breast Cancer Detection System

2006 ◽  
Vol 2 (3) ◽  
Author(s):  
Marek Bialkowski ◽  
Norhudah Seman ◽  
Amin Abbosh ◽  
Wee Chang Khor
Keyword(s):  
Breast Cancer ◽  
Cancer Detection ◽  
Detection System ◽  
Synthesis Method ◽  
Breast Cancer Detection ◽  
Power Divider ◽  
Frequency Synthesis ◽  
Step Frequency ◽  
Power Dividers ◽  
Time Space

The design of compact wideband microwave reflectometers for the purpose of inclusion in a breast cancer detection system is presented. In this system, a wideband frequency source is used to synthesize a narrow pulse via the step-frequency synthesis method. The reflectometer undertakes measurements in the frequency domain and the collected data is transformed into the time/space domain using IFFT. In order to accomplish reflection coefficient measurements over a large frequency band, compact wideband couplers and power dividers are used to form the reflectometer. Two compact six-port reflectometer configurations are investigated. One uses the Lange coupler and the Gysel power divider and the other one employs a 3dB slot-coupled microstrip coupler and a 2-stage Wilkinson power divider. The reflectometer employing the slot-coupled coupler and the Wilkinson divider provides a wider operational bandwidth, as shown by simulation results performed with Agilent ADS.

A Novel Full Phase-Coherent Frequency Synthesis Method for SFWF Radar Application

2011 ◽  
Vol 59 (7) ◽  
pp. 1840-1845 ◽  
Author(s):  
Mingzhou Zhan ◽  
Xiaoqiang Xie ◽  
Hongfei Yao ◽  
Ruimin Xu ◽  
Weigan Lin
Keyword(s):  
Synthesis Method ◽  
Frequency Synthesis
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