Title :
Modified rectangular oscillating patch antenna with bipolar transistor
Author :
Bonefacic, D. ; Bartolic, J.
Author_Institution :
Fac. of Electr. Eng. & Comput., Zagreb Univ., Croatia
Abstract :
A new self-oscillating antenna built by integrating a bipolar transistor and a line impedance transformer in a rectangular opening inside a rectangular patch is presented. This compact and low cost design showed a very linear change of the oscillating frequency with the DC bias voltage. A clean spectrum was observed in the whole tuning range. The radiation patterns show no degradation in comparison to a non-modified patch. The cross-polarization levels in both the E and H planes are low. The possibility of external injection locking has been demonstrated.
Keywords :
UHF oscillators; active antennas; antenna radiation patterns; bipolar transistor circuits; electromagnetic wave polarisation; microstrip antennas; DC bias voltage; E plane; H plane; UHF; active antennas; bipolar transistor; compact design; cross-polarization levels; external injection locking; line impedance transformer; low cost design; modified rectangular oscillating patch antenna; oscillating frequency; radiation patterns; self-oscillating antenna; tuning range; Bipolar transistors; Costs; Fabrication; Gunn devices; Impedance matching; Microstrip antennas; Oscillators; Patch antennas; Radar antennas; Resonance;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1999. IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-5639-x
DOI :
10.1109/APS.1999.789294
