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.

scholarly journals A high-efficiency continuous class-F power amplifier design using simplified real frequency technique

2020 ◽  
Vol 9 (5) ◽  
pp. 1924-1932
Author(s):  
Md. Golam Sadeque ◽  
Zubaida Yusoff ◽  
Mardeni Roslee
Keyword(s):  
Power Amplifier ◽  
Frequency Band ◽  
High Efficiency ◽  
Fourth Generation ◽  
Real Frequency ◽  
Fifth Generation ◽  
Amplifier Design ◽  
4G Wireless ◽  
Frequency Power ◽  
Class F

The fourth-generation (4G) wireless communication has been deployed in many countries. However, there are still some problems such as spectrum crisis due to the increase of wireless mobile devices and servicing. Therefore, the fifth-generation (5G) communication system will be employed at some different spectrum other than 4G frequency band. The radio frequency power amplifier (RFPA) is the key component of the 5G system. In this paper, a broadband continuous class-F (CCF) RFPA is designed for the 5G frequency band from 3.3-4.3 GHz. The input and output matching network are designed using the simplified real frequency technique (SRFT). Using a 10W GaN CGH40010F Cree device, the efficiency of the RFPA achieved greater than 70.7% for the whole frequency band with a maximum of 81.5%. The output power and the gain are more than 40 dBm and 10 dB respectively

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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