In this paper, we have presented simulated and measured results of tunable monopole circular microstrip antenna for dual frequency which covers L, C, and X band applications. The proposed antenna consists of two identical stubs placed along the patch axis having fixed width WS =1.0 cm. The slot is placed on left side of feed axis which is having fixed L1= 1.279 cm, L2 =1.3 cm and width W1= 0.1 cm. The upper and lower length of two identical stub is varied from LUS=0.483 to 1.83 cm and LLS=0.257 to 0.957 cm to tune an antenna for dual band. The first band varies from 1.8325 GHz to 1.5175 GHz having tuning range of 17.48% and 16.0% and second band varies from 8.5375 GHz to 7.2775 GHz having tuning range of 14.77% and 12.48% when simulated and measured respectively. The maximum impedance bandwidth of 111 % and 30.9 % is achieved for first and second band respectively. The antenna has peak gain of 3.0 dB. The VSWR is less 2 than for all tuned frequencies. The proposed antenna covers applications of L, C and X band. The simulated results are in good agreement with experimental results. The radiation patterns are nearly omni-directional nature both in E and H plane.

Identical stubs, slot, CMCMSA and TMCMSADF

[1] S.O. Kundukulam, M. Paulson, C. K. Anandan, and P. Mohanan,
“Slot-loaded compact microstrip antenna for dual-frequency operation”, Microwave Optical Technological Letters, Vol. 31 , Issue.5, pp.379–381, 2001.
[2] G. Kumar and K. P.Ray,. “Broad Band Microstrip Antennas”, Artech House, 2003
[3] Garg, R, P. Bhartia, I . Bhal and A.Ittipiboon,”Microstrip Antenna Design Hand Book”, Artech Inc., 2001.
[4] Balnis C .A , “Antenna theory, Analysis and design”, 2nded, Wiley, New York 1997.
[5] Jia-Wei Dai, Hong-Li Peng, Yao-Ping Zhang, and Jun-Fa Mao, “A Novel Tunable Microstrip Patch Antenna Using Liquid Crystal”, Progress In Electromagnetics Research C, Vol. 71, pp.101–109, 2017.
[6] Shubham Chouhan ,and Rajdeep Shrivastava, “Design and Analysis of Different Types of Modern Methods Using Line Feed of Microstrip Antenna Using CST Software” , International Journal of Computer Sciences and Engineering Vol.7(4), pp.594-603,Apr 2019.
[7] R C. Jain, M M. Kadam , “A Novel Design of Compact Planner UWB Antenna with Multiple Band Rejection Function”, International Journal of Scientific Research in Network Security and Communication, Vol. 5(2) , May 2017.
[8] A. E. Daniel & G. Kumar, “Tunable dual & triple frequency stub loaded rectangular microstrip antenna (MSA)”, Proc. IEEE antennas propagation symposium , pp.2140-2143, 1995.
[9] K. P. Ray, S. Nikhil and A. Nair,“Compact Tunable and Dual band Circular Microstrip Antenna for GPS and Bluetooth Applications”, International Journal of Microwave and Optical Technology, Vol.4, no.4, pp.205-210, July 2009.
[10] Serrano-Vaello. Á. and Sánchez-Hernández, D,“PrintedAntennas for dual-band GSM/DCS1800 mobile handsets”, Electronics Letters, Vol. 34, No. 2, pp. 140-141, Jan. 1998.
[11] X. L. Sun, S. W. Cheung, And T. I. Yuk “,Dual-Band Monopole Antenna With frequency-Tunable Feature For Wimax Applications” , IEEE Antennas And Wireless Propagation Letters, Vol. 12, pp. 100-103, 2013.
[12] Shweta Singh and Namrata Sahayam,“New 2GHz Broadband microstrip patch antenna for C-band Pervasive wireless Communication”, International Journal of Engineering Science & Advanced Technology , Volume-2, Issue-4, pp, 971 – 974, Jul-Aug 2012.