Title :
Transistor oscillator 24.7 GHz stabilized by HEM221 mode of rectangular dielectric resonator
Author :
Haase, M. ; Hoffmann, Karel
Author_Institution :
Dept. of Electromagn. Field, Czech Tech. Univ. in Prague, Prague, Czech Republic
Abstract :
A transistor oscillator 24.7 GHz with rectangular dielectric resonator (DR) working in HEM221 mode in feedback path between drain and gate was developed in the microstrip structure. Lower mode oscillations were suppressed by properly designed layout of the circuit. 4.5 dBm output power and 100 dBc/Hz phase noise at 100 kHz from the carrier was achieved with transistor VMMK-1225.
Keywords :
circuit feedback; circuit stability; dielectric resonator oscillators; microwave oscillators; microwave transistors; DR; HEM221 mode; VMMK-1225 transistor; feedback path; frequency 24.7 GHz; lower mode oscillations; microstrip structure; phase noise; rectangular dielectric resonator; transistor oscillator; Microstrip; Microwave circuits; Microwave measurement; Microwave oscillators; Microwave transistors; Transistors; AWR Microwave Office; CST Microwave studio; E-pHEMT; HEM221; Rectangular dielectric resonator;
Conference_Titel :
Microwave Techniques (COMITE), 2013l Conference on
Conference_Location :
Pardubice
Print_ISBN :
978-1-4673-5512-4
DOI :
10.1109/COMITE.2013.6545043
