Abstract
In this paper, a new design method is proposed for a planar and compact dual-band dipole antenna. The dipole antenna has arms as a hybrid CRLH (Composite right- and left-handed) transmission-line comprising distributed and lumped elements for the dual-band function. The two arms are fed by the outputs of a compact and printed CRLH dual-band balun which consists of a CRLH hybrid coupler and an additional CRLH phase-shifter. Its operational frequencies are 2.4 and 5.2 GHz as popular mobile applications. Verifying the method, the circuit approach, EM (Electromagnetics) simulation and measurement are conducted and their results turn out to agree well with each other. Additionally, the CRLH property is shown with the dispersion diagram and the effective size-reduction is mentioned.
Highlights
Nowadays, wireless connectivity from equipment to other equipment and technological convergence becomes more vibrant
The trapezoid dipole arms are printed on one side of the substrate and the other single dipole is formed on the opposite side
Nair [9] presented an F-shaped slot line to feed a dual-band dipole antenna which are fed by an SMA connector
Summary
Wireless connectivity from equipment to other equipment and technological convergence becomes more vibrant. Tseng et al developed a CRLH balun to control the phase slope As a result, they obtained the multi-band property by using the two branches where one arm consists of the RH-TL (Right-handed transmission line) and the other part is based on the LH-TL (Left-handed transmission line) with lumped elements [16]. The balun consists of the branch-line coupler and the compact metamaterial phase shifters that are horizontally cascaded [22] The dipole antenna is different from others by having two arms in the form of hybrid metamaterial lines and have the same omni-directional pattern at the two resonance frequencies; 2.4 and 5.2 GHz are chosen as the test case and the circuit approach is done first, and followed by the EM simulation and the measurement. The CRLH property is shown with the dispersion diagram and the size reduction effect of the proposed balun is addressed
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