volume | PIER Journals

Abstract

A tunnel diode integrated E-shaped patch antenna is proposed and analyzed using equivalent circuit concept. It is found that bias voltage of tunnel diode controls the performance of the antenna. Various tunable frequency bands are obtained by selecting suitable bias voltage while antenna topology remains unchanged. Bandwidth of the tunnel diode integrated patch improves to 40.26% over the 32.58% bandwidth of the patch. The radiation pattern also varies with bias voltage and a considerable improvement in beamwidth is observed however radiated power remains almost same.

1. Kumar, G. and K. C. Gupta, "Broad band microstrip antennas using additional resonators gap coupled to the radiating edges," IEEE Trans. Antenna Propag., Vol. 32, No. 12, 1375-1379, Dec. 1984.
doi:10.1109/TAP.1984.1143264 Google Scholar

2. Nishiyama, E., M. Aikawa, and S. Egashira, "Stacked microstrip antenna for wideband and high gain," Progress In Electromagnetics Research, Vol. 33, 29-43, 2001.
doi:10.2528/PIER00091501 Google Scholar

3. Huynh, T. and K. K. Lee, "Single layer single patch wideband microstrip antenna," Electronics Letters, Vol. 31, No. 16, 1310-1312, Aug. 1995.
doi:10.1049/el:19950950 Google Scholar

4. Yang, F., X. X. Xhang, X. Ye, and Y. R. Samii, "Wide-band Eshaped patch antenna for wireless communications," IEEE Trans. Antenna Propag., Vol. 49, No. 7, 1094-1100, July 2001.
doi:10.1109/8.933489 Google Scholar

5. Ang, B. K. and B. K. Chung, "A wideband E-shaped microstrip patch antenna for 5–6 GHz wireless communications," Progress In Electromagnetics Research, Vol. 75, 397-407, 2007.
doi:10.2528/PIER07061909 Google Scholar

6. Srivastava, S., B. R. Vishvakarma, and J. A. Ansari, "Tunnel diode loaded rectangular microstrip antenna for millimeter range," IEEE trans. Antenna Propagate, Vol. 51, No. 4, 750-755, April 2003.
doi:10.1109/TAP.2003.811073 Google Scholar

7. Bahl, I. J. and P. Bhartia, Microstrip Antennas, Artech House, 1980.

8. Xhang, X. X. and F. Yang, "Study of a slit cut on a microstrip antenna and its applications," Microwave and Optical Technology Letters, Vol. 18, No. 4, 297-300, July 1998. Google Scholar

9. Bahl, I. J., Lumped Elements for RF and Microwave Circuits, Artech House, 2003.

10. Woo, W. F. and F. Chow, Principles ofT unnel Diodes Circuits, 1964.

11. Carver, K. R. and J. W. Mink, "Microstrip antenna technology," IEEE Trans. Antenna Propag., Vol. 29, No. 1, 2-23, Jan. 1981.
doi:10.1109/TAP.1981.1142523 Google Scholar

Prof. Jamshed Aslam Ansari

Dr. Ram Ram