Design of a wideband antenna by manipulating characteristic modes of a metallic loop

A wideband antenna is designed by manipulating characteristic modes (CMs) of a metallic loop structure. It is shown that the resonant behavior of the CMs can be modified by inductive loading on the specific positions of the loop antenna. Therefore, it is possible to manipulate certain modes to ensur...

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Bibliographic Details
Published in:Microwave and optical technology letters 2019-02, Vol.61 (2), p.513-518
Main Authors: Wen, Dingliang, Hao, Yang, Wang, Hanyang, Zhou, Hai
Format: Article
Language:English
Subjects:
Antenna design
Bandwidths
Broadband
characteristic modes
Design
loop antenna
Loop antennas
multi‐mode antenna
Resonant frequencies
wideband antenna
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Summary:A wideband antenna is designed by manipulating characteristic modes (CMs) of a metallic loop structure. It is shown that the resonant behavior of the CMs can be modified by inductive loading on the specific positions of the loop antenna. Therefore, it is possible to manipulate certain modes to ensure their resonant frequencies are close to each other. Then, a proper feeding scheme can be designed such that these modes are excited simultaneously and a multi‐mode wideband antenna can be obtained. It is found that by using the theory of characteristic modes (TCMs), the antenna design procedure becomes more intuitive. To validate the proposed approach, the wideband antenna was fabricated and tested. Simulation and measurement results indicate that it can achieve a wide impedance bandwidth of 51.6% with |S11| 
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.31560