Browsing by Author "Wu, Sung-Jung"

Now showing 1 - 14 of 14

A Capacitively-Loaded PIFA Based Reader Antenna for Portable RFID Application
(2010)
Wu, Sung-Jung
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Chao, Chi-Hung
;
Tarng, Jenn-Hwan
;
電信工程研究所
;
Institute of Communications Engineering
A capacitively loaded planar inverted F antenna (PIFA) for a portable RFID application is presented. The antenna consists of four parts: a ground plane, a rectangular radiator with cut slots, an excited stub, and a shorting pin on the right-hand side that connects the ground plane to the rectangular radiator. The excited stub and the rectangular radiator are forms capacitive coupling. The capacitive coupling and shorting pin are used to effectively reduce the antenna size. Parametric studies of the proposed antenna are discussed to understand the operating mechanism and to produce a brief design guideline. The proposed antenna is easy to integrate in radio frequency devices for low manufacturing costs.
A Compact Dual Notched Bands CPW-Fed Slot Antenna
(2018-01-01)
Lin, Chu-Huan
;
Cheng, Wen-Chi
;
Wu, Sung-Jung
;
Tarng, Jenn-Hwan
;
電信工程研究所
A compact dual notched bands CPW-fed slot antenna is presented. The antenna consists of a wideband CPW-fed slot antenna and four connected slots which can create the impedance mismatch in the unwanted bands. Furthermore, the evolution of the proposed antenna is used to illustrate the band notched operation. The measured results agreed with the simulated results confirm the good omnidirectional radiation patterns with flat gains in the wanted bands but strong gain suppression in the unwanted bands. The proposed antenna can be used in the 2G/5GHz WLAN operation with over 14 dB gain suppression in 2.78-3.36 GHz and 4.03-4.76 GHz bands. The proposed antenna can be easily integrated with other mobile communication devices for its small size, 27(L) X 21 (W) mm(2), and planar structure is suitable for multiband wireless applications.
A Frequency Reconfigurable Slot Antenna Using PIN Diodes
(2009)
Chen, Keng-Hsien
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Wu, Sung-Jung
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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 Low-Profile Dipole Type Passive UHF Band RFID Tag Antenna
(2010)
Wu, Sung-Jung
;
Tarng, Chi-Hung Chao Jenn-Hwan
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, a low-profile dipole type passive UHF radio frequency identification (RFID) tag antenna used in the UHF band is presented. The proposed antenna is anti-symmetrical about the origin and consists of meandered lines and two metal plates. The measured maximum read range of the proposed tag antenna is 6.5 meters at 915MHz. The proposed tag antenna size is 25 mm by 65 mm, and the operating bandwidth is from 902 to 928 MHz under 6dB power reflection coefficient condition. The performance analysis, Kurokawa's method and the Friis free-space formula, is presented along with the simulated and measured data.
A Multi-eared Antenna with Frequency and Polarization Reconfigurability
(2011)
Chen, Keng-Hsien
;
Chen, Jhao-Ru
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Wu, Sung-Jung
;
Tarng, Jenn-Hwan
;
電控工程研究所
With the rapid development of cognitive radio technology, reconfigurable antennas are getting more and more attention. In general, the design of reconfigurabilities and impedance matching of reconfigurable antennas is individually achieved by different parts of antenna structure. However, designs of this kind increases switching mechanism complexity and the cost of antennas. This paper presents an innovative multi-eared antenna with frequency and polarization reconfigurability. The proposed ear-like structures can concurrently control and influence the resonant frequency, phase, and antenna impedance to simultaneously achieve the design of frequency reconfigurability, polarization reconfigurability, and impedance matching. The proposed antenna demonstrates that it can switch its frequency to 3.2 GHz, 3.35 GHz, or 3.5 GHz with linear polarization (LP); or it can switch its polarization to linear, left hand, or right hand circular polarization (LHCP/RHCP) at 3.35 GHz. The simulated and measured results of the proposed antenna indicate that it possesses good impedance bandwidth and axial ratio (AR). Hence, the proposed reconfigurable antenna is well suited to wireless communication applications.
A Multiband Quasi-Yagi Type Antenna
(2010-02-01)
Wu, Sung-Jung
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Kang, Cheng-Hung
;
Chen, Keng-Hsien
;
Tarng, Jenn-Hwan
;
電信工程研究所
A new design of multiband quasi-Yagi type antenna for 700 MHz band, GSM900, DCS1800, GPS, and Bluetooth/WLAN applications is presented. In contrast to conventional quasi-Yagi antenna design, our proposed antenna realizes the multiband performance by interaction between the section extended ground and the derived driver element which is a branch of driver dipole element. The parametric studies of the proposed antenna are discussed to explore the antenna operating mechanism. The performances of the antenna are demonstrated along with measured and simulated results.
A Notched-Band UWB Planar Monopole Antenna using the Tapped-line Coupled Resonator
(2009)
Wu, Sung-Jung
;
Kang, Cheng-Hung
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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.
A Novel Folded UWB Antenna for Wireless Body Area Network
(2012-02-01)
Kang, Cheng-Hung
;
Wu, Sung-Jung
;
Tarng, Jenn-Hwan
;
交大名義發表
;
National Chiao Tung University
A novel folded ultrawideband antenna for Wireless Body Area Network (WBAN) is proposed, which can effectively reduce the backward radiation and proximity effects of human bodies. The proposed antenna has a low-profile 3D structure that consists of a bevel-edge feed structure and a metal plate with folded strip. The bevel edge feed structure achieves broadband impedance matching and the metal plate acts as the main radiator. Moreover, the folded strip not only extends the lower frequency band but also provides additional resonant frequency around 6 GHz. The final bandwidth covers from 3.1 GHz to 12 GHz. The proposed antenna shows the directional patterns with low backward radiation due to the patch-like structure and the ground plane also prevents from the proximity effects of human bodies. Furthermore, the simulated SAR values of the proposed antenna are lower than the values of omnidirectional disc planar monopole. These features demonstrate that the proposed antenna is suitable for WBAN application.
A Novel Three-Dimensional Hybrid Spatial Model for Wideband MIMO Channel in Indoor Environments
(2010)
Tarng, Jenn-Hwan
;
Chang, Wei-Ju
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Wu, Sung-Jung
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電機工程學系
;
Department of Electrical and Computer Engineering
Studies of the effects of three-dimensional (3D) propagations on MIMO channel correlation and capacity have been presented in some literatures based on given 3D stochastic models of angle spectrum. However, it is only for narrowband MIMO channels and can not properly include specular reflections due to walls and/or the ground. In this letter, a hybrid spatial channel model, which combines a 3D ray-tracing based model for deterministic rays with a new 3D model for single-bounce randomly scattering rays, is proposed to investigate wideband spatial/polarized MIMO channel correlation. Based on the proposed model, the per-tap correlation among MIMO sub-channels is formulated and is validated by indoor measurements. From the comparison between measured and computed sub-channel correlations, it is found that our 3D model is more accurate than the 2D model, which only considers the propagation path in the horizontal plane, for both the co-polarized and the cross-polarized antenna cases. It is noted that the concept of effective scattering region is introduced in our model, which can increase computation efficiency without sacrifice the prediction accuracy.
A wideband, slotted bow-tie antenna with reconfigurable CPW-to-slotline transition for pattern diversity
(2008-02-01)
Wu, Sung-Jung
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Ma, Tzyh-Ghuang
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交大名義發表
;
National Chiao Tung University
We propose a slotted bow-tie antenna with pattern reconfigurability. The antenna consists of a coplanar waveguide (CPW) input, a pair of reconfigurable CPW-to-slotline transitions, a pair of Vivaldi-shaped radiating tapered slots, and four PIN diodes for reconfigurability. With suitable arrangement of the bias network, the proposed antenna demonstrates reconfigurable radiation patterns in the frequency range from 3.5 to 6.5 GHz in three states: a broadside radiation with fairly omnidirectional pattern and two end-fire radiations whose mainbeams are directed to exactly opposite directions. The proposed antenna is investigated comprehensively with the help of the radiation patterns in the two principal cuts and Also the antenna gain responses versus frequencies. The simulation and measurement results reveal fairly good agreement and hence sustain the reconfigurability of the proposed design.
An Ultra-Wideband Millimeter Wave Aperture-coupled Patch Antenna Using a Comb-shaped Metasurface
(2019-01-01)
Hsu, Ching-Cheng
;
Liu, Nai-Chen
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Wu, Sung-Jung
;
Tarng, Jenn-Hwan
;
交大名義發表
In this study, a novel ultra-wideband aperture-coupled patch antenna using a comb-shaped metasurface (MS) was investigated for millimeter wave applications. The proposed antenna was fabricated with 4 layers of PCB and can be realized based on two parts, an aperture coupling feeding network, and a radiator. The coupling feeding network comprises a microstrip line with a radial stub and a coupling aperture (slot line). The radiator is a combination of a driven patch and a comb-shaped MS, which are made of uniform 4 x 4 metallic patch cells. The driven patch is used to provide good coupling performance that conveys the current to be distributed on the comb-shaped MS. The comb-shaped MS also functions as a wideband radiator that enhances the impedance bandwidth. To validate the design, a prototype operating on 28 GHz to 56 GHz was fabricated and measured. The simulated and measured results are in reasonable agreement. The prototype antenna with dimensions of 0.45 lambda(0) x lambda(0) x 0.45 lambda(0) x 0.16 lambda(0), has a 10 dB impedance bandwidth of 65%, and a gain range of 5-8 dBi.
Compact four bands hybrid filtering antenna using step impedance resonators and tuning stub transition structures
(2018-06-13)
Chen, Keng-Hsien
;
Lo, Yu-Chen
;
Lee, Yi-Shi
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Wu, Sung-Jung
;
Tarng, Jenn-Hwan
A novel compact four bands hybrid filtering antenna composed of a hybrid radiator and a four bands bandpass filter is presented. The hybrid radiator is constructed using the micro-strip line fed, the square-ring and the T-stub near the ground plane. The proposed four bands bandpass filter is composed of two parts, one is two-step impedance resonators (SIRs) and the other is the tuning stub transition structure. With tuning stub transition structure, two SIRs effectively match to 50 hybrid radiator. Furthermore, the geometry of the proposed filter is U-shaped with the micro-strip fed around the hybrid radiator. The evolution of the hybrid radiator and the construction of the four bands bandpass filter using the two SIRs and the transitions are discussed in detail. The proposed filtering antenna not only possesses numerous operation bands with good band edge gain selectivity but also reduces the occupied size in the modern communication device. The overall size of the proposed filtering antenna is 33mmx36.4mmx0.508mm, and the operation frequencies are 1.8/2.45/3.5/5.2GHz bands for GSM1800/WLAN/WiMAX applications. The measured results agree with simulated outcomes.
High Directional Compact PIFAs for the Indoor Position Searching Scheme
(2017-01-01)
Liao, Shao-Chun
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Wu, Sung-Jung
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Chen, Keng-Hsien
;
Tarng, Jenn-Hwan
;
電信工程研究所
High directional compact PIFAs for the indoor position searching scheme is presented. In this paper, each proposed PIFA uses parametric and optimized design to compact the size. And the size of each PIFA is 5.2 x 23.5 mm(2). Four proposed PIFAs are placed in the circular PCB in order to achieve the indoor position searching scheme by using RSSI method. An effective beam angle of each PIFA is 90 degrees. Therefore, four PIFAs have covered 360 degrees radiation in xy-plane. The peak gain of the proposed PIFA is 2.5 dBi and the front-to-back ratio is more than 18 dB. The measurement shows the proposed PIFAs and the searching scheme are suitable for indoor positioning applications.
Study of an Ultrawideband Monopole Antenna With a Band-Notched Open-Looped Resonator
(2010-06-01)
Wu, Sung-Jung
;
Kang, Cheng-Hung
;
Chen, Keng-Hsien
;
Tarng, Jenn-Hwan
;
交大名義發表
A novel band-notched planar monopole ultrawideband (UWB) antenna is proposed. A notched band, located in the 5 GHz WLAN band, is created using a resonator at the center of a fork-shaped antenna. The resonator is composed of an open-looped resonator and two tapped lines. With the open-looped resonator, the antenna has a good band-notched performance and bandstop-filter-like response in the target band. A parametric study of the notched bandwidth is described that explored the antenna operating mechanism. Then, an equivalent circuit model illustrates the band-notched behaviors more clearly. The antenna input admittance calculated with the equivalent circuit model reasonably agrees with the HFSS simulated result. The proposed antenna also features flat gain frequency responses, small varied group delay and 15 to 35 dB gain suppression at the notched band. Accordingly, the band-notched antenna can effectively select target bands by adjusting these antenna parameters.