Browsing by Author "Chan, Chao-Kai"

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A Frequency Reconfigurable Slot Antenna Using PIN Diodes
(2009)
Chen, Keng-Hsien
;
Wu, Sung-Jung
;
Kang, Cheng-Hung
;
Chan, Chao-Kai
;
Tarng, Jenn-Hwan
In this paper, a frequency reconfigurable slot antenna using PIN diodes is proposed. The proposed structure is based on an open-end straight slot line on the bottom layer and a microstrip line input on the top layer. By means of the two PIN diodes and the associated dc bias network, the proposed antenna has the ability to alternatively switch the operating frequency. The proposed antenna is made of FR4 substrate and use commercial PIN diodes. The measured results agree with simulated results, and further verify the design concept. The proposed antenna can be applied in the commercial wireless communication due to its low cost and low profile properties.
A Notched-Band UWB Planar Monopole Antenna using the Tapped-line Coupled Resonator
(2009)
Wu, Sung-Jung
;
Kang, Cheng-Hung
;
Chen, Keng-Hsien
;
Chan, Chao-Kai
;
Tarng, Jenn-Hwan
In this paper, we propose a band-notched monopole antenna for ultra-wideband applications. The notched band, 5GHz WLAN band, is created by using a proper-positioned tapped-line coupled resonator on a fork-shaped radiator center. The proposed antenna also features flat gain frequency response, small varied group delay and 10 to 18dB gain suppression in the notched band. Details of the antenna are discussed along with measured and simulated results.