Title :
Multi-octave planar microwave slot-coupled directional coupler up to 28 GHz with novel phase velocity compensation
Author :
Oborovski, Andreas ; Hofmann, Maximilian ; Weigel, Robert ; Kissinger, Dietmar
Author_Institution :
Inst. for Electron. Eng., Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
A nonuniform symmetrical QTEM-mode directional slot-line coupler operating in a multi-octave frequency range from 2.5 GHz up to 28.6GHz is presented. The calculated continuously varying even- and odd-mode line impedances are realized by a 3D electromagnetic (EM) field simulation of the slot-coupled microstrip cross section. A new method of even- and odd-mode phase velocity compensation, based on a continuously structured prepreg, is suggested. A -8.34 dB coupling factor is achieved, showing a low amplitude and phase imbalance up to 28 GHz. Furthermore, a tandem configuration is evaluated by utilizing two -8.34 dB directional coupler to form a wideband -3.01 dB coupler.
Keywords :
directional couplers; electromagnetic fields; slot line components; 3D electromagnetic field simulation; coupling factor; even-mode line impedances; even-mode phase velocity compensation; frequency 2.5 GHz to 28.6 GHz; multioctave planar microwave slot-coupled directional coupler; nonuniform symmetrical QTEM-mode directional slot-line coupler; odd-mode line impedances; odd-mode phase velocity compensation; phase imbalance; slot-coupled microstrip cross section; wideband coupler; Couplings; Directional couplers; Loss measurement; Microstrip; Microwave communication; Directional Coupler; Passive Microwave Circuits; Wideband;
Conference_Titel :
Microwave Conference (EuMC), 2014 44th European
Conference_Location :
Rome
DOI :
10.1109/EuMC.2014.6986373
