Abstract
An asymmetric feeding X-band active leaky-wave antennas is developed, to excite the first high order mode of the microstrip leaky wave antenna. One is the asymmetric feeding leaky-wave antenna which integrated with a HEMT oscillator, and the other is the frequency-tuned leaky-wave antenna which integrated with a varactortuned HEMT VCO. The microstrip leaky-wave antenna is operated in the first higher mode. To excite the first higher mode, the microstrip leaky-wave antenna is fed asymmetrically. The dominant mode excitation has been successfully suppressed by adding a sequence of covered wire in the center of the microstrip leaky wave antenna. The design of these active leaky-wave antennas is discussed and the beam scanning phenomena of the antenna is presented. The HEMT oscillator frequency is controlled by tuning the varactor DC bias and the beam scanning is demonstrated. The measured scanning angle agree with prediction, it is close to 30° as the VCO frequency tuned from 8.06 GHz to 9GHz.
Similar content being viewed by others
Reference
K. Chang, K. A. Hummer, and J. K. Klein, “Experiments on injection locking of active antenna elements for active phased arrays and spatial power combiners,”IEEE Trans. Microwave Theory Tech., vol.MTT-37, pp.1078–1084, July1989.
K. D. Stephan, “Inter-injection locked oscillator for power combining and phased arrays,”IEEE Trans. Microwave Theory Tech., vol.MTT-34, pp.1017–1025, Oct.1986.
R. A. York and R. C. Compton, “Quasioptical power combining using mutually synchronized oscillator arrays,IEEE Trans. Microwave Theory Tech., vol.MTT-39, pp.1000–1009, June1991.
P. Liao and R. A. York, “A new phase-shifterless beam-scanning technique using arrays of couple oscillators,”IEEE Trans. Microwave Theory Tech., vol.MTT-41, pp.1810–1815, Oct.1993.
A. A. Oliner, “A new class of scannable millimeter wave antennas,” inProc. 20th European Microwave Conf., 1990, pp95–104.
G.-J. Jou and C.-K. Tzuang, “Oscillator-type active-integrated antenna: The leaky-mode approach,”IEEE Trans. Microwave Theory Tech., vol.MTT-44, pp.2265–2272, Dec.1996.
W. Menzel, “A new traveling wave antenna,” inProc. 8th European Microwave Conf., 1978, pp302–306.
A. A. Oliner and K. S. Lee, “Microstrip leaky wave strip antennas,”in 1986 IEEE AP-S Int. Symp. Dig. pp443–446.
C. A. Balanis, “Antenna theory analysis and design,” New York: Wiley, 1982.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hu, C.C., Wu, J.J. & Jou, C.F. An asymmetric feeding X-band active frequency-scanning leaky-wave antenna. Int J Infrared Milli Waves 18, 1843–1856 (1997). https://doi.org/10.1007/BF02678293
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02678293