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Now showing items 1 - 16 of 42

  • Triple-band MIMO Dipole Antenna for LTE Access Points

    Lu, Jui-Han   Hung, Ming-Tsung  

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  • Compact tag antenna for UHF active RFID applications

    Lu, Jui-Han   Liou, Zi-Hao  

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  • Broadband Design of Planar Circular Tag Antenna for UHF RFID System

    Lu, Jui-Han   Zheng, G. T.  

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  • Planar omnidirectional tag antenna for UHF RFID system

    Lu, Jui-Han   Siao, Bai-Fu  

    A novel design of planar omnidirectional tag antenna for ultra high frequency (UHF) radio frequency identification (RFID) is proposed. With the use of a square loop accompanying dual dipole strips, the measured half-power bandwidth of the proposed broadband tag antenna can reach 143MHz (8571000MHz), which includes the entire operating bandwidth for worldwide UHF RFID system. Meanwhile, with omnidirectional reading pattern, the measured reading distance is about 11.0m as it is mounted on the carton. Good tag sensitivity was obtained across the desired frequency band.
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  • Planar Compact LTE/WWAN Monopole Antenna for Tablet Computer Application

    Lu, Jui-Han   Lin, Zi-Wen  

    A novel design of a planar multiband monopole antenna with dual parasitic shorted strips for LTE/WWAN operation in the tablet computer is proposed. The obtained impedance bandwidth across the operating bands can reach about 255/980 MHz for the LTE/WWAN bands, respectively. Only with the antenna size of 45 x 15 x 0.8 mm(3), the proposed planar antenna has the compact operation with more than 25% antenna size reduction. The measured peak gains and antenna efficiencies are about 2.5/3.6 dBi and 85/84% for the LTE/WWAN bands, respectively.
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  • Planar Internal LTE/WWAN Monopole Antenna for Tablet Computer Application

    Lu, Jui-Han   Tsai, Feng-Chuan  

    By using a T-shaped parasitic shorted strip, this work presents a planar coupled-fed U-shaped monopole antenna with eight-band LTE/WWAN operation in tablet computers. The obtained impedance bandwidths across dual operating bands approach 281 MHz and 1088 MHz at the LTE and WWAN bands, respectively. The proposed uniplanar antenna reduces the antenna size by at least 20% since the overall antenna size is only 50 x 15 x 0.8 mm(3). The measured peak gains and antenna efficiencies are approximately 2.9/5.4 dBi and 72/80% for the LTE/WWAN bands, respectively. Moreover, with a compact structure, the proposed planar antenna can be deposited inside the tablet computer and complies with the body specific absorption rate (SAR) requirement (<1.6 W/kg for 1-g body tissue) for practical applications.
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  • Planar Small-Size Eight-Band LTE/WWAN Monopole Antenna for Tablet Computers

    Lu, Jui-Han   Wang, Yi-Shiang  

    This work describes a novel small-size monopole antenna with eight-band LTE/WWAN operation in tablet computers by introducing a G-shaped driven monopole strip. The subsequently obtained impedance bandwidths across dual operating bands approach 264/1046 MHz at the LTE and WWAN bands, respectively. Given that the overall antenna size is only 35 x 10 x 0.8 mm(3), the proposed planar monopole antenna provides more than 40% reduction in antenna size over that of the conventional ones. Additionally, the measured peak gains and antenna efficiencies are approximately 3.6/5.2 dBi and 67/70% for the LTE/WWAN bands, respectively. Moreover, the proposed planar compact antenna can be deposited inside the tablet computer and fulfills the body specific absorption rate (SAR) requirement (< 1.6 W/kg for 1-g body tissue) for mobile device applications.
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  • Internal Uniplanar Antenna for LTE/GSM/UMTS Operation in a Tablet Computer

    Lu, Jui-Han   Wang, Yi-Shiang  

    With the use of an internal printed loop matching circuit, a small-size uniplanar antenna with eight-band LTE/GSM/UMTS operation in the tablet computer is proposed. The obtained impedance bandwidth across the operating bands can reach about 262/1610 MHz for the LTE/GSM/UMTS bands, respectively. Only with the antenna size of 40 x 15 x 0.8 mm(3), the proposed planar antenna has the compact operation with more than 30% antenna size reduction. Furthermore, the measured peak gains and antenna efficiencies are about 2.81/4.97 dBi and 79/87% for the LTE/GSM/UMTS bands, respectively.
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  • Planar compact triple-band monopole antenna for IEEE 802.16m WiMAX application

    Lu, Jui-Han   Lee, Yu-Yi  

    Planar compact monopole antenna design with triple-band operation for the IEEE 802.16m worldwide interoperability for microwave access (WiMAX) system is proposed. By adding C- and L-shaped monopole strips to the antenna, excitation of multiresonant modes can approximate the 2.6, 3.5, and 5.5GHz bands required for WiMAX (IEEE 802.16m) operations. The obtained impedance bandwidths across the operating bands approach 168/325/1208MHz for the 2.6/3.5/5.5GHz bands, respectively. The proposed uniplanar antenna reduces the antenna size by at least 15%, since overall antenna volume is only 22x28x0.8mm(3) (0.19(o)x0.243(o)x0.007(o), at 2.6GHz). The measured peak gains and radiation efficiencies approximate 3.0/4.2/4.5dBi and 77/76/83% in the 2.6/3.5/5.5GHz band, respectively, and exhibit a nearly omni-directional pattern in the XY-plane.
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  • Small-size LTE/WWAN monopole antenna with octa-band operation for 4 G mobile phone

    Lu, Jui-Han   Fang, Ying-Sheng  

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  • Planar Broadband Circularly Polarized Antenna With Square Slot for UHF RFID Reader

    Lu, Jui-Han   Wang, Sang-Fei  

    Novel circular polarization (CP) design of planar broadband antenna with square slot for UHF RFID system is proposed and experimentally studied. By insetting the arc-shaped strip into the square slot, the proposed CP design can easily be achieved with the impedance bandwidth (RL >= 10 dB) of about 142 MHz (15.3% @ 931 MHz) and the 3 dB axial-ratio (AR) bandwidth of about 166 MHz (17.7% @ 940 MHz) for UHF RFID applications. The measured peak gain and radiation efficiency are about 6.8 dBic and 98% across the operating band, respectively, with nearly bidirectional pattern in the XZ- and YZ-plane.
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  • Planar Compact Slot Antenna With Multi-Band Operation for IEEE 802.16m Application

    Lu, Jui-Han   Huang, Bing-Jhang  

    A novel multi-band design of planar slot antenna with compact operation for IEEE 802.16m WiMAX system is proposed. With the use of C- and inverted L-shaped slots, multi resonant modes close to 2.6/3.5/5.5 GHz bands can be excited to meet the specifications of WiMAX system (IEEE 802.16m). The obtained impedance bandwidth across these operating bands can reach about 525/743/813 MHz for the 2.6/3.5/5.5 GHz bands, respectively. We derive more than 10% reduction in antenna size and gain compact operation only from 32 14 0.8 antenna dimension. The measured peak gains and total radiation efficiencies are about 3.0/4.3/5.2 dBi and 88/95/97% for the 2.6/3.5/5.5 GHz bands, respectively, with nearly omni-directional pattern in the -plane.
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  • Planar circularly polarized tag antenna with compact operation for UHF RFID application

    Lu, Jui-Han   Chang, Bo-Shen  

    A novel compact design of planar circularly polarized (CP) tag antenna for UHF RFID system is proposed. By introducing the Y-shaped slit as the feed structure, the measured half-power bandwidth of the proposed CP tag antenna can be more than 135MHz (860-1000MHz), which includes the entire operating bandwidth for worldwide UHF RFID system. The obtained 3dB axial-ratio (AR) bandwidth can be about 10MHz suitable for Taiwan UHF RFID applications. The proposed tag antenna reduces the antenna size by at least 30% since the antenna size is only 40x40xmm(2). The simulated peak gain and antenna efficiency are approximately 0.4dBic and 91% for Taiwan UHF RFID band. Meanwhile, with omnidirectional reading pattern, the measured reading distance is about 7.2m. Good tag sensitivity was obtained across the desired frequency band.
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  • Planar Dual-Band Circular Polarization Monopole Antenna for Wireless Local Area Networks

    Lu, Jui-Han   Liou, Chong-Wei  

    A novel planar dual-band circular polarization (CP) monopole antenna is proposed. By introducing an inverted L-shaped strip-sleeve shorted to the ground plane, the proposed dual-band CP antenna design easily achieves impedance bandwidths (RL >= dB) approximating 1932/339 MHz and 3-dB axial-ratio bandwidths approximating 250/360 MHz in 2.4/5.2-GHz wireless local area networks (WLANs), respectively. Across all bandwidths, the measured peak gain and radiation efficiency approximate 2.4/2.8 dBic and 97%/65% in 2.4/5.2-GHz WLANs, respectively, with highly bidirectional patterns in the xz- and yz-planes.
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  • Planar compact dual-band monopole antenna with circular polarization for WLAN applications

    Lu, Jui-Han   Huang, Hao-Shiang  

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  • Planar Compact Square-Ring Tag Antenna With Circular Polarization for UHF RFID Applications

    Lu, Jui-Han   Chang, Bo-Shen  

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