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IEEE Transactions on Antennas and Propagation
Volume 48 Number 6, June 2000

An Aperture-Coupled Linear Microstrip Leaky-Wave Antenna Array with Two-Dimensional Dual-Beam Scanning Capability

Page 909.

Abstract:

This paper describes an X-band 4 × 1 aperture-coupled series-fed electronically steerable microstrip leaky-wave antenna (LWA) array design, which has dual-beam radiation pattern and two-dimensional (2-D) beam-scanning capability. The LWA array is operated in the first higher order mode and excited by center-fed aperture coupled for dual-beam operation. The varactor-tuned phase shifters are placed between the antenna elements. The measured half-power beamwidth of the H-plane and quasi-E-plane radiation patterns are less than 30° . By tuning the reverse dc bias of the varactor diodes, the main beam can be scanned in azimuth plane from -13° to +13° off broadside. In the elevation plane, the beam-scanning angle is close to 20° as the operating frequency tuned from 11.58-12.5 GHz. Taking into account each phase-shifter insertion loss and phase progression, the measured results compared closely with the theoretical prediction. The proposed antenna array is suitable for wireless communication and collision warning radar systems.

References

1. G.-J. Jou and C.-K. Tzuang, "Oscillator-type active-integrated antenna: The leaky-mode approach", IEEE Trans. Microwave Theory Tech., vol. 44, pp.  2265-2272, Dec.  1996.
2. C.-C. Hu, J.-J. Wu and C. F. Jou, "An active frequency-tuned bean scanning leaky-wave antenna", Microwave Opt. Technol. Lett., vol. 17, pp.  43-45, Jan  1998.
3. C. J. Wang, J.-J. Wu and C. F. Jou, "A new two-terminal feeding active leaky-wave antenna", IEEE Trans. Antennas Propagat., vol. 46, pp.  1748-1749, Nov.  1998.
4. C. N. Hu and C.-K. Tzuang, "Microstrip leaky-mode antenna array", IEEE Trans. Antennas Propagat., vol. 45, pp.  1698-1699, Nov.  1997 .
5. C. Luxey and J.-M. Laheurte, "Dual-beam array of microstrip leaky-wave antennas", Inst. Elect. Eng. Electron. Lett., vol. 34, pp.  1041-1042, May  1998.
6. A. A. Oliner, "A new class of scannable millimeter wave antennas", in 20th Proc. Eur. Microwave Conf., Budapest, Hungary,Sept. 1990, pp.  95-104. 
7. C.-C. Hu, J.-J. Wu and C. F. Jou, "A two-dimensional beam-scanning linear active leaky-wave antenna array", IEEE Microwave Guided Wave Lett., vol. 9, pp.  102-104,  Mar.  1999.
8. R. A. York and R. C. Compton, "Quasi-optical power combining using mutually synchronized oscillator arrays", IEEE Trans. Microwave Theory Tech., vol. 39, pp.  1000-1009, June  1991.
9. P. Liao and R. A. York, "A new phase-shifterless beam-scanning technique using arrays of couple oscillators", Trans. Microwave Theory Tech., vol. 41, pp.  1810-1815, Oct.  1993.
10. N.-A. Kao, C.-C. Hu, J.-J. Wu and C. F. Jou, "Active aperture-coupled leaky-wave antennas", Inst. Elect. Eng. Electron. Lett., vol. 34, pp.  2183 -2184, Nov.  1998.
11. A. A. Oliner and K. S. Lee, "Microstrip leaky wave strip antennas", in IEEE AP-S Int. Symp. Dig., Philadelphia, PA, June 1986, pp.  443-446. 
12. J. F. White, Microwave Semiconductor Engineering, New York: Van Nostrand, 1982.
13. R. H. Hardin, E. J. Downey and J. Munushian, "Electronically-Variable phase shifters utilizing variable capacitance diode", Proc. IRE Lett., vol. 48, pp.  944-945,  May  1960.