|
||||||||||||||||
|
||||||||||||||||
|
||||||||||||||||
PIERS Online
Vol. 3
No. 8
2007
pp: 1316-1320Design of Conformal Tapered Leaky Wave AntennaOnofrio Losito doi:10.2529/PIERS070403144715 Downloads: 1701 Abstract:The bend structure of leaky-wave antennas based on curve tapered design has been proposed and investigated. The new leaky-wave antenna (LWA) was designed running a simple procedure which use an FDTD code, and using a physical grounding structure along the length of the antenna, which allows to use only half of the structure, the adoption of a simple feeding, and the reduction of sidelobes. The good performance of this new tapered microstrip LWA are mainly wider band, higher gain, and higher efficiency whit reference to conventional uniform microstrip LWAs. Bending the curve tapered LWA, the major performance noticed of this antenna were the wider beam of radiation pattern and a further reduction of back lobes. Moreover since the tapering of linear LWA involves the variation of both phase and leakage constant, all the emitted rays are focused in a corresponding angular interval, allowing to obtain from the ray optical model a closed formula to predict the main beam angle of linear and curve taper LWA. Finally from theoretical analysis it should be appreciated that, as the relative dielectric constant of the substrate approaches 1, the leaky wave antenna bandwidth becomes much wider, improving its performance.References:1. Menzel, W., "A new traveling-wave antenna in microstrip," Arch. Elek. Uhertragung., Vol. 33, 137-140, 1979. 2. Oliner, A., "Leakage from higher modes on microstrip line with application to antennas," Radio Scienze, Vol. 22, 907-912, 1987. 3. Itoh, T. and R. Mittra, "Spectral domain approach for calculating the dispersion characteristics of microstrip lines," IEEE Trans. Microwave Theory Techn., Vol. MTT-21, 496-499, 1973. 4. Kuester, E. F., R. T. Johnk, and D. C. Chang "The thin-substrate approximation for reflection from the end of a slab-loaded parallel-plate waveguide with application to microstrip patch antennas," IEEE Trans. Antennas and Propagation, Vol. AP-30, No. 5, Sep., 1982. 5. Zelinski, G. M., M. L. Hastriter, M. J. Havrilla, J. S. Radcliffe, A. J. Terzuoli, and G. A. Thiele "FDTD analysis of a new leaky traveling wave antenna," Wireless Communications and Applied Computational IEEE/ACES 2005 Intl. Conf., 152-155, Apr., 2005. 6. Hong, W., T. L. Chen, C. Y. Chang, J. W. Sheen, and Y. D. Lin "Broadband tapered microstrip leaky-wave antenna," IEEE Trans. Antennas and Propagation, Vol. 51, 1922-1928, 2003. 7. Losito, O., A new design of broadband microstrip leaky-wave antenna "Proceeding of 23rd Applied Computational Electromagnetics, ACES 2007 Int. Conf.," , Verona, Italy, 19--23 March, 2007. 8. Burghignoli, P., F. Frezza, A. Galli, and G. Schettini "Synthesis of broad-beam patterns through leaky-wave antennas with rectilinear geometry," IEEE Antennas and Wireless Propagation Letters, Vol. 2, 136-139, 2003. 9. Qian, Y., B. C. C. Chang, T. Itoh, K. C. Chen, and C. K. C. Tzuang "High efficiency and broadband excitation of leaky mode in microstrip structures," IEEE MTT-S Microwave Symposium Digest, Vol. 4, 1419-1422, 1999. |
||||||||||||||||
| © Copyright 2008 PIERS. All Rights Reserved. | ||||||||||||||||
