222 Int. J. Wireless and Mobile Computing, Vol. 11, No. 3, 2016 Copyright © 2016 Inderscience Enterprises Ltd. Ultra-wide band magneto-electric dipole antenna for radio frequency integrated circuits Neetu* Department of Electronics and Communication, Manipal University Jaipur, Jaipur, India Email: neetu03@rediffmail.com *Corresponding author Ganga Prasad Pandey Department of Information and Communication Technology, Pandit Deen Dayal Petroleum University, Gandhinagar, Gujrat, India Email: ganga.mait@gmail.com V.N. Tiwari Department of Electronics and Communication, Manipal University Jaipur, Jaipur, India Email: vivekanand.tiwari@jaipur.manipal.edu Abstract: A novel differentially fed magneto-electric dipole antenna is proposed and analysed, which is simpler and better in performance than previously designed antennas by various counterparts. The antenna has achieved an impedance bandwidth of 133.3% (0.5–2.5 GHz) for a differential reflection coefficient less than –10 dB. The maximum broadside gain 7.5 dBi has been achieved. A unidirectional radiation pattern with stable gain has also been observed for the entire range of frequency operation. Symmetric radiation pattern for both E-plane and H-plane has also been confirmed owing to the symmetry of antenna structure and feed excitation. The cross-polarisation level lower than –30 dB has also been observed for better signal purity. Keywords: radiation pattern; broadside antenna; magneto-electric dipole antenna; gain; differentially fed antenna; RFIC; radio frequency integrated circuit. Reference to this paper should be made as follows: Neetu, Pandey, G.P. and Tiwari, V.N. (2016) ‘Ultra-wide band magneto-electric dipole antenna for radio frequency integrated circuits’, Int. J. Wireless and Mobile Computing, Vol. 11, No. 3, pp.222–227. Biographical notes: Neetu is pursuing PhD from Manipal University Jaipur, India. Her area of interest includes microwave antenna, microwave filters and digital communication. She has published more than eight papers in national and international conferences and journals. Ganga Prasad Pandey is working as Assistant Professor in Pandit Deen Dayal Petroleum University, Gandhinagar, Gujrat, India. His area of interest includes microstrip antenna. He has published more than 15 papers in national and international conferences and journals. V.N. Tiwari is working as Professor in Manipal University Jaipur, India. His area of interest includes horn antenna and radar systems. He has published more than 70 papers in national and international conferences and journals. 1 Introduction Recently, differential circuits are in great demand in radio frequency integrated circuits (RFICs) and microwave monolithic integrated circuits (MMICs) because of their good performance characteristics like common mode rejection, low mutual coupling, less noise, great harmonic suppression and high linearity. But most of these antennas have been designed for single ended circuits. Baluns are most commonly designed for the transition between