Analytical Computation of Resonant Frequency of Rectangular Dielectric Resonator Antenna By Including Effective Dimensions of DRA Piyush Sharma 1 • Mahender Singh 2 • Arti Vaish 3 • R. S. Yaduvanshi 4 Ó Springer Science+Business Media, LLC, part of Springer Nature 2018 Abstract In this paper, a new concept of effective dimensions of rectangular dielectric resonator antenna (DRA) is introduced to calculate the resonant frequency of rectangular DRA accurately. Mathematical modeling for computation of resonant frequency is developed using transcendental equation and appropriate boundary conditions of rectangular dielectric resonator antenna. Difference between effective and actual physical dimensions are analysed for different modes in details. Important parameters that control the effective dimensions, that is, physical dimensions, orientation, and dielectric constant of DRA, have been studied. E-fields inside the rectangular DRA have also been studied for different frequencies. Sim- ulations and experimental measurements were carried out to verify the proposed concept. Theoretical, simulated, and experimental results of resonant frequency of the dielectric resonant antenna have been compared and are found to be in agreement with each other. Keywords Resonant frequency Á Rectangular dielectric resonator antenna Á Modes Á Effective dimensions Á Transcendental equation & Mahender Singh msingh5500@gmail.com Piyush Sharma peeyush24x7@nic.in Arti Vaish artivaish@ansaluniversity.edu.in R. S. Yaduvanshi yaduvanshirs007@gmail.com 1 National Technical Research Organisation (NTRO), Govt of India, New Delhi, India 2 Guru Tegh Bahadur Institute of Technology, New Delhi, India 3 School of Engineering and Technology, Ansal University, Gurgaon, Haryana, India 4 Ambedkar Institute of Advance Communications Technology and Research, New Delhi, India 123 Wireless Pers Commun https://doi.org/10.1007/s11277-018-5857-4