Browsing by Author "Ling, Ching-Wei"

Now showing 1 - 9 of 9

A new high isolation dual-antennas with miniature decoupling network design
(2007)
Chen, Shin-Chang
;
Wang, Yu-Shin
;
Ling, Ching-Wei
;
Chung, Shyh-Jong
;
電信工程研究所
A Simple Printed Ultrawideband Antenna With a Quasi-Transmission Line Section
(2009-10-01)
Ling, Ching-Wei
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
In this communication, we propose a simple and compact printed ultrawideband (UWB) antenna. The antenna is mainly composed of a monopole section and a quasi-transmission line section. The input signal from the feed line first passes through the line section then enters the monopole. The quasi-transmission line section provides different functions as the operating frequency changes. It serves not only as an impedance matching circuit but also a main radiator, which leads to the UWB performance of the antenna. The resonance mechanisms across the full band are described, followed by a thorough study of the antenna's geometrical parameters.
All-planar Penta-band Strip-loaded Slit Antenna for Laptop Applications
(2009)
Ling, Ching-Wei
;
Wang, Sy-Been
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
In this study, an all-planar penta-band antenna for laptop applications is presented. This antenna is placed parallel to the upper edge of the laptop panel (300 x 200 mm(2)) with a restricted available space (120 x 10 x 0.4 mm(3)) The antenna is mainly composed of two back-to-back strip-loaded slit antennas with different sizes and a T-shaped feeding network. Each strip-loaded slit antenna has two resonances, respectively provided by the metal strip and the slit. The measured 6-dB return loss bandwidth covers the GSM850/900/DCS/PCS/UMTS. Over the GSM850/900 and the DCS/PCS/UMTS bands, the average gains in the H-plane are about 2.06 dBi and 0.02 dBi, respectively. Good antenna features and the planar configuration make the proposed antenna attractive for ultra-thin laptop applications.
An on-package planar inverted-F antenna for WLAN application
(2006)
Ling, Ching-Wei
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A novel on-package planar inverted-F antenna (PIFA) is proposed in this paper. The on-package PIFA consists of a single folded copper plate and has several advantages including compact size, light weight, low cost and easy fabrication. Besides, the antenna radiation pattern is omnidirectional in H-plane. The coupling effect between the on-package PIFA and the RF components in the shielding package is investigated. It is observed that the antenna performance is rarely changed even though the RF component is embedded in the package. In addition, the best isolation between the antenna and RF components can be achieved when the components are appropriately arranged in the package.
Analysis and application of an on-package planar inverted-F antenna
(2007-06-01)
Ling, Ching-Wei
;
Lee, Chia-Yu
;
Tang, Chia-Lun
;
Chung, Shyh-Jong
;
電信工程研究所
An on-package planar inverted-F antenna (PIFA is -described. The on-package PIFA consists of a single folded metal plate and has several advantages, including small size, light weight, low cost, and ease of fabrication. The antenna radiation pattern is omnidirectional in the H-plane. The coupling effect between the on-package PIFA and the radio-frequency (RF) components in the shielding package was studied. The antenna performance rarely changes and the isolation between the antenna and the RF components can be maximized when the locations of the components are appropriately arranged in the package. Finally, a wireless local-area network (WLAN) front-end module (FEM) including the switch, low-pass filter (LPF), bandpass filter (BPF), and power amplifier (PA), is embedded into the shielding package of the antenna. The error vector magnitude (EVM) of the resultant antenna integrated FEM, together with a WLAN card containing the baseband/medium-access control (MAC) circuitry, is tested. Good performance is obtained, showing the usability of the proposed antenna configuration.
Design of a planar ultrawideband antenna with a new band-notch structure
(2007-12-01)
Hong, Chong-Yu
;
Ling, Ching-Wei
;
Tarn, I-Young
;
Chung, Shyh-Jong
;
電信工程研究所
A novel planar ultrawideband (UWB) antenna with band-notched function. The antenna consists of a radiation patch that has an arc-shaped edge and a partially modified ground plane. The antenna that makes it different from the traditional monopole antenna is the modification in the shape of ground plane, including two bevel slots on the upper edge and two semicircle slots on the bottom edge of the ground plane. These slots improve the input impedance bandwidth and the high frequency radiation performance. With this design, the return loss is lower than 10 dB in 3.1-10.6 GHz frequency range and the radiation pattern is highly similar to the monopole antenna. By embedding a pair of T-shaped stubs inside an elliptical slot cut in the radiation patch, a notch around 5.5 GHz WLAN band is obtained. The average gain is lower than -18 dBi in the stopband, while the patterns and the gains at frequencies other than in the stopband are similar to that of the antenna without the band-notched function.
Implementation of a multi-beam switched parasitic antenna for wireless applications
(2007)
Ke, Jia-Cheng
;
Ling, Ching-Wei
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
Implementation of an array of monopoles antenna capable of sector beam steering for the wireless ad-hoc network applications is proposed. The antenna operating in the 2.4GHz band with one active central element surrounded by 8 parasitic elements on a finite ground plane is simply made of FR4 PCB, and the parasitic elements are switched to be short or open to act like a corner reflector for beam shaping and steering. The simulated and experimental results are presented to justify the feasibility of the antenna configuration and open/short control of the parasitic elements in the antenna.
PLANAR ANTENNA
(2010-07-29)
Chung, Shyh-Jong
;
Wang, Sy-Been
;
Ling, Ching-Wei
The present invention discloses a planar antenna including a substrate, a ground plane and a feed line. The ground plane is disposed on one side of the substrate. The ground plane includes a hollow portion. The feed line disposed on another side of the substrate and corresponding to the hollow portion for feeding a signal. The present invention also discloses a planar antenna including a substrate, a ground plane and a feed line. The ground plane is disposed on one side of the substrate. The ground plane includes a first hollow portion and a second hollow portion. The feed line is disposed on another side of the substrate and having a first branch feed portion and a second branch feed portion for feeding a signal, and the first branch feed portion and the second branch feed portion are aligned with the first hollow portion and the second hollow portion respectively.
Planar binomial curved monopole antennas for ultrawideband communication
(2007-09-01)
Ling, Ching-Wei
;
Lo, Wen-Hsin
;
Yan, Ran-Hong
;
Chung, Shyh-Jong
;
電信工程研究所
The curve of a planar antenna edge is an important parameter which affects the antenna performances. In this study, we propose a new edge curve, characterized by the binomial function, for designing ultrawideband antenna. The effect on the impedance bandwidth through the change with the different order of the binomial function and the gap width between the antenna and ground plane has been investigated and analyzed. The measurement result shows a good agreement with the simulation. Besides, the radiation patterns are omnidirectional in the H plane across the operating bandwidths.