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A Miniature Dual-band PIFA Antenna for Bluetooth/WLAN Applications
Ching-Lieh Li,Chi-Hsiang Liu 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper a dual-band PIFA (Planar Inverted-F Antenna) is investigated. By use of meander patch and defected ground. The antenna volume can be limited to 11×6×4㎣. The patch for the PIFA is located over the top surface of an FR4 substrate and is fabricated by wire-cutting machine. The goal is to implement a miniature dual-band antenna suited for the Bluetooth and wireless LAN applications, of which the operating frequencies are in the 2.4 and 5.2 and 5.8㎓.
Parallel-Plate Capacitor Structures with Enhanced Linearity
Ching-Lieh Li,Chih-Wei Hsueh,Ding-Kai Lin 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, the FDTD method is employed to calculate the static capacitance of several parallel-plate capacitors. The study of the capacitor characteristics is made to emphasis on the linearity analysis for the possible sensor application. The linearity of several parallel-plate structures is examined, which include a simple parallelplate capacitor, a parallel-plate structure with guard ring only, etc. Although the guard ring is usually utilized to increase the linearity of a simple parallel-plate capacitor, it is found that the linearity of a parallel-plate capacitor with guard ring is actually the same as a simple parallel-plate capacitor with the same plate area. Afterwards, a new parallel-plate structure with pins inserted in between the parallel plates is proposed to reduce the linearity deviation as the separation of the parallel plates changes.
DUAL BAND DIPOLE-LOADED NOTCH ANTENNA
Ching-Lieh Li,Chun-Feng Wen,Ya-Kuan Ling 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a dipole-loaded notch antenna designed for the operation of the dual-band WLAN application. The antenna structure starts with a quarter-wavelength slit cut on a ground plane with suitable addition of a planar wire dipole connected to the open ends of the notch. The monopole notch is designed to radiate at the low frequency band, 2.4 ㎓ for IEEE 802.11b/g, while the planar wire dipole is responsible for the other band, 5.2/5.8 ㎓ for IEEE 802.11a. It is found that the wire dipole has the side effect of reducing the slit length due to its capacitive loading effect at the low frequency band. The parametric study is performed to demonstrate the characteristics of the proposed antenna, from which the guidelines for the design of the proposed antenna are provided.