Cavity-backed Cylindrical Wraparound Antennas

(Ω)151050−5this formulation[10] microstrip wraparoundR inX in−102.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5f (GHz)Fig. 4. Input impedance for a cavity-backed wraparound antenna. b =21 mm, a = 20 mm, z 1c = −25 mm, z 2c = 25 mm, z 1a = −10mm, z 2a = 10 mm, z f = 5 mm, W f = 2 mm, ε r=9.6, 4 probes atφ = 0, 90 o , 180 o , 270 o.1510R in[6] J. Ashkenazy, S. Shrikman, and D. Treeves, "Electric surface currentmodel for the analysis of microstrip antennas on cylindrical bodies",IEEE Trans. Antennas Propagat., vol. AP-33, pp. 295-300, Mar. 1985.[7] R. F. Harrington, Field Computation by Moment Method, New York:Macmillian, 1968.[8] L. C. Kempel, and J. L. Volakis, "Radiation by cavity-backedantennas on a circular cylinder", IEE Proceedings on Microwaves,Antennas and Propagation, vol. 142, No. 3, 1995, pp. 233-239.[9] S. M. Ali, T. M. Habashy, J. F. Kiang, and J. A. Kong, "Resonancein cylindrical-rectangular and wraparound structures", IEEE Trans.Microwave Theory Tech., vol. 37, No. 11, pp. 1773-1783, Nov. 1989.[10] T. M. Habashy, S. M. Ali, and J. A. Kong, "Input impedance and radiationpattern of cylindrical-rectangular and wraparound microstripantennas", IEEE Trans. Antennas and Propagat., vol. 38, No. 5, pp.722-731, May 1990.[11] F. C. Franklin, S. B. A. Fonseca, J. M. Soares, and A. J. Giarola,"Analysis of microstrip antennas on circular-cylindrical substrateswith a dielectric overlay", IEEE Trans. Antennas Propagat., vol. 39,No. 9, pp. 1398-1403, Sep. 1991.[12] C. C. Silva, Redes de antenas de microlinha moldadas sobre superfíciescilíndricas com interface optoeletrônica, PhD Thesis (inportuguese), Instituto Tecnológico da Aeronáutica, 1992.[13] O. M. C. Pereira Filho, "Flush-mounted Cylindrical-rectangularMicrostrip Antennas", IET Microwaves, Antennas & Propagation,Vol. 3, No. 1, pp. 1-13, 2009.[14] R. F. Harrington, Time-Harmonic Electromagnetic Fields, McGrawHill, 1961.[15] R. E Munson, "Conformal microstrip antennas and microstripphased arrays", IEEE Trans. Antennas and Propagation, vol. 22, pp.74-78, Jan. 1974.5(Ω)0−5X in−10L zc= 30 mmL zc= 40 mmL zc= 50 mm−152.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5f (GHz)Fig. 5. Input impedance for a cavity-backed wraparound antenna. − −−L zc = 30 mm, ___L zc = 40 mm, ...L zc = 50 mm.impedance with the cavity size is also presented.REFERENCES[1] K-L. Wong, Design of Nonplanar Microstrip Antennas and TransmissionLines, Wiley Interscience, 1999.[2] C. C. Krowne, "Cylindrical-rectangular microstrip antennas", IEEETrans. Antennas Propagat., vol. AP-31, No. 1, pp. 194-199, Jan.1983.[3] C. Yang and Y. Z. Ruan, "Radiation Characteristics of WraparoundMicrostrip Antenna on Cylindrical Body", Electronic Letters, vol.29, No. 6, pp. 512-14.[4] K.-L. Wong and S.-Y. Ke, "Characteristics of the CylindricalWraparound Microstrip Patch Antenna", Proc. Natl. Sci. Counc.ROC(A), vol. 17, No. 6, pp438-42.[5] S. B. A. Fonseca and A. J. Giarola, "Analysis of MicrostripWraparound Antennas using Dyadic Green’s Functions", IEEETrans. Antennas and Propagation, vol. AP-31, No. 2, March 1983,pp. 248-53.2009 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC 2009) 60