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International Journal of Antennas and Propagation
Volume 2013, Article ID 923259, 5 pages
Research Article

Frequency-Adjustable Small Zeroth-Order Resonant Antenna with Capacitor-Loaded Rectangular Slot on Ground Plane

School of Electrical and Electronics Engineering, Chung-Ang University, 221 Heukseok-dong Dongjak-gu, Bobst Hall no. 534, Seoul 156-756, Republic of Korea

Received 17 April 2013; Revised 1 August 2013; Accepted 2 August 2013

Academic Editor: Francisco Falcone Lanas

Copyright © 2013 Youngsoo Jang and Sungjoon Lim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A capacitor-loaded electrical small zeroth-order resonant (ZOR) antenna is proposed. The proposed antenna is designed on the basis of a mushroom structure for zeroth-order resonance. To obtain a compact size, the proposed antenna has a rectangular slot on the ground plane, and the chip capacitor is mounted on the slot. The resonant frequency is easily controlled from 2.82 GHz to 2.29 GHz by changing the capacitance from 1 pF to 7 pF, respectively. Therefore, the proposed antenna has the advantages of a small antenna size as well as easy frequency adjustment.