Abstract
New design of a circularly polarized microstrip patch antenna excited with a push-pull transistor oscillator is presented. At the outputs of the push-pull oscillator the signals have 180o ; ; ; phase shift. In order to obtain circular polarization the microstrip patch is excited in two points with signals having 90o ; ; ; phase shift. To convert the 180o ; ; ; phase shift between the oscillator outputs to the required 90o ; ; ; phase shift at the patch excitation points a quarter-wavelength long microstrip line is used. The oscillator and the line are integrated in an opening in the patch in order to maintain small dimensions. The antenna prototype is manufactured and its characteristics are experimentally investigated. Frequency tuning is obtained by changing the dc bias voltage. The antenna radiates left-handed circularly polarized wave. The spectrum is clean and no spurious compo-nents are observed. The radiation pattern is not disturbed by the modifications in the patch and by the active circuitry.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
