Rectangular Microstrip Antenna with Air Cavity for High Gain and Improved Front to Back Ratio

Kaushik Malakar, Jaydeep Nandi, Souvik Mitra, Prasanta Kumar Gorai, Sudipta Chattopadhyay, Sandip Banerjee

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DOI: 10.4236/jemaa.2011.39058                

Abstract

A rectangular microstrip patch antenna using conventional Poly Tetra Fluride Ethelene (PTFE) substrate with air cavity is proposed and theoretically investigated. Considerably high gain along with improved front to back radiation isolation is demonstrated using such proposed antenna. The radiation performance of this new antenna has been compared to a conventional microstrip patch for some commonly used aspect ratios (width to length ratio). Compared to conventional microstrip antenna the proposed configuration shows more than 12% increment in peak gain and more than 10% increment in front to back radiation performance in each set of aspect ratio. The elucidation of such improvement in the radiation characteristics of the proposed antenna is also presented.

Keywords

Air Cavity, Front to Back Radiation, High Gain, Microstrip Antenna

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	D. R. Jackson, J. T. Williams and A. K. Bhattacharyya, “Microstrip Patch Designs That do Not Excite Surface Waves,” IEEE Transactions on Antennas and Propagation, Vol. 41, No. 8, 1993, pp. 1026-1037. doi:10.1109/8.244643
[2]	W. Y. Ali-Ahmad, W. L. Bishop and T. W. Growe, “An 86-106 GHz Quasi-Integrated Low Noise Schottky Receiver,” IEEE Transactions on Microwave Theory and Techniques, Vol. 41, No. 4, 1993, pp. 558-564.
[3]	M. Slotz, G. Gottwald, H. Haspeklo and J. Wenger, “Planar Single- and Dual-Polarized Aperture Coupled E-Band Antennas on GaAs Using SiNx-Membranes,” Antennas and Propagation Society International Symposium, Baltimore, 21-26 July 1996, pp. 1540-1543.
[4]	R. F. Drayton, “The Development and Characterization of Self-Packages Using Micromachining Techniques for High Frequency Circuit Applications,” PhD Thesis, University of Michigan, Ann Arbor, 1995, pp. 102-123.
[5]	M. J. Vaughan, K. Y. Hur and R. C. Compton, “Improvement of Microstrip Patch Antenna Radiating Patterns,” IEEE Transactions on Antennas Propagation, Vol. 42, No. 6, 1994, pp. 882-885. doi:10.1109/8.301717
[6]	G. V. Elefttheriades, “Analysis and Design of Integrated-Circuit Horn Antennas for Millimeter and Submilimeter-Wave Applications,” PhD Thesis, University of Michigan, Ann Arbor, 1993, pp. 151-178.
[7]	S. Chattopadhyay, J. Y. Siddiqui and D. Guha, “Rectangular Microstrip Patch on a Composite Dielectric Substrate for High Gain Wide Beam Radiation Patterns,” IEEE Transactions on Antennas & Propagations, Vol. 57, No. 10, 2009, pp. 3324-3327. doi:10.1109/TAP.2009.2029607
[8]	S. Chattopadhyay, J. Y. Siddiqui and D. Guha, “Rectangular Patch on Air and Air-Dielectric Composite Substrates to Achieve Improved Radiation Characteristics,” Proceedings of Applied Electromagnetics Conference, Kolkata, 14-16 December 2009, pp. 1-4.
[9]	High Frequency Structure Simulator, v. 10.
[10]	S. Chattopadhyay, M. Biswas, J. Y. Siddiqui and D. Guha, “Input Impedance of Probe-Fed Rectangular Microstrip Antennas with Variable Air-Gap and Varying Aspect Ratio,” IEE Microwaves, Antennas & Propagation, Vol. 3, No. 8, 2009, pp.1151-1156.
[11]	S. Chattopadhyay, M. Biswas, J. Y. Siddiqui and D. Guha, “Rectangular Microstrips with Variable Air-Gap Varying Aspect Ratio: Improved Formulation and Experiments,” Microwave Optical Technology Letters, Vol. 51, No. 1, 2009, pp. 169-173.
[12]	G. P. Gauthier, A. Courtay and G. M. Rebeiz, “Microstrip Antennas on Synthesized Low Dielectric Constant Substrate,” IEEE Transactions on Antennas and Propagation, Vol. 45, No. 8, 1997, pp. 1310-1314.