Title :
Voltage controlled self-oscillating microstrip patch antenna
Author :
Bartolic, Juraj ; Sanford, John ; Sipus, Zvonimir ; Bonefacic, Davor
Author_Institution :
University of Zagreb, Faculty of Electrical Engineering and Computing, Department of Radiocominunications and Microwave Engineering, Unska 3, HR-10000 Zagreb, Croatia
Abstract :
An active rectangular microstrip patch antenna for quasi-optical power combining arrays is hereby described. Part of the patch metallization was removed to form a rectangular opening where a Gunn diode was placed. This modification lowered the Q and allowed the oscillating patch to perform VCO capabilities. Patch parameters were optimized using a moment method procedure. A tuning range of more than 300 MHz at 9.85 GHz and EIRP of 208 mW was obtained. A clear spectrum with no spurious components of the free running oscillating antenna was observed. Injection locking experiments were performned. At 9 V bias, a locking gain of 40.9 dB with locking bandwidth of 5.9 MHz was obtained. Radiation patterns in E and H plane were measured. Low levels of cross-polarisation were observed.
Keywords :
Diodes; Gunn devices; Metallization; Microstrip antenna arrays; Microstrip antennas; Moment methods; Optimization methods; Patch antennas; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Microwave Conference, 1995. 25th European
Conference_Location :
Bologna, Italy
DOI :
10.1109/EUMA.1995.336970
