naa a22 4500 510798993 CHVBK 20180411083347.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11277-013-1071-6 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1071-6 BST Varactor Loaded Frequency Agile Stacked Circular Microstrip Radiator [Elektronische Daten] [Ganga Pandey, Binod Kanaujia, Surendra Gupta, A. Gautam] A new frequency agile BST varactor loaded stacked circular microstrip antenna is presented. The antenna is analysed using extended cavity model. One of two bands of antenna is tunable with the help of BST varactor. The upper band is useful for WiMAX and lower band for other wireless communication systems. Various antenna parameters like return loss, resonant frequency, frequency agility etc. have been investigated. The simulated results agree well with the numerical data. A frequency agility of 60.64% is achieved, which is better than simple Varactor diode loaded antenna. Lowest resonant frequency of 0.866GHz is obtainable that shows a significant physical area reduction. The group delay of S $$_{11}$$ remains constant for entire band of operation. Springer Science+Business Media New York, 2013 Microstrip antenna nationallicence Circular patch antenna nationallicence Varactor nationallicence BST nationallicence Stacked antenna nationallicence Pandey Ganga Department of Electronics and Communication Engineering, Maharaja Agrasen Institute of Technology, Delhi, India aut Kanaujia Binod Department of Electronics and Communication Engineering, Ambedkar Institute of Advanced Communication Technologies and Research, Geeta Colony, 110031, Delhi, India aut Gupta Surendra Department of Electronics, Ambedkar Polytechnic, Delhi, India aut Gautam A. Department of E&C, G.B.P.E.C., Pauri, Uttarakhand, India aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/2(2013-09-01), 1157-1172 0929-6212 72:2<1157 2013 72 11277 https://doi.org/10.1007/s11277-013-1071-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1071-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pandey Ganga Department of Electronics and Communication Engineering, Maharaja Agrasen Institute of Technology, Delhi, India aut NATIONALLICENCE 700 1- Kanaujia Binod Department of Electronics and Communication Engineering, Ambedkar Institute of Advanced Communication Technologies and Research, Geeta Colony, 110031, Delhi, India aut NATIONALLICENCE 700 1- Gupta Surendra Department of Electronics, Ambedkar Polytechnic, Delhi, India aut NATIONALLICENCE 700 1- Gautam A. Department of E&C, G.B.P.E.C., Pauri, Uttarakhand, India aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/2(2013-09-01), 1157-1172 0929-6212 72:2<1157 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer