Open AccessDesign and analysis of defected ground structure transformer for dual‐band antenna
Author(s) -
Choi WaiWa,
Chang Ka Fai,
Leong Chon Chio,
Cheong Pedro,
Tam Kam Weng
Publication year - 2014
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2014.0275
Subject(s) - monopole antenna , multi band device , electrical impedance , transformer , electrical engineering , antenna tuner , return loss , dipole antenna , planar , antenna (radio) , acoustics , physics , electronic engineering , computer science , antenna factor , engineering , voltage , computer graphics (images)
This study presents a novel dual‐band antenna design methodology utilising a dual‐frequency impedance transformer with defected ground structure (DGS). The proposed dual‐frequency DGS impedance transformer generates a second resonant frequency from a conventional single‐band antenna, resulting dual‐band operation. Simulation studies illustrate that the adopted design achieves versatile configurations for arbitrary operating frequencies and diverse input impedance ranges in planar antenna structures. To experimentally verify the proposed design methodology, a dual‐frequency DGS impedance transformer was implemented for a 2.4 GHz monopole antenna to obtain a 900/2400 MHz dual‐band antenna. Measurement shows that the 10 dB return loss bandwidth in 900 MHz band is 34.4 MHz, whereas that in 2400 MHz band is wider than 530 MHz. Typical monopole radiation patterns are observed at both operating bands.