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We propose a self-restored ring-based TDM PONs to prevent fiber cut. By using our proposed Y-type passive component in each remote node (RN), the proposed ring-based PS-PON can be revived promptly under single fiber failure. The protection and restoration time of the proposed ring-type access network is depends on the switching time of switch of PRY layer. Moreover, the system performance is also...
A low-profile surface-mount metal chip antenna with a symmetric planar inverted-F structure suitable for 2.4 GHz WLAN operation is presented. The proposed antenna is obtained by folding a single metal plate which includes several periodic slots and two-pairs of symmetric soldering strips as the feed and short pins. Due to the two-pairs of symmetric feed and short pins, it is more flexible to be integrated...
Power quality issues have increasingly been given more and more attentions recently by power system and consumers. The begin-end time and disturbance amplitude are important properties of power quality disturbance. It is necessary to detect power quality in order to analyze and evaluate it. Because the calculation quantity and redundancy of continuous wavelet transform was big and multi-resolution...
A high gain low-profile antenna design using metamaterial technology operating at WiMAX 2.5-GHz band (2.50–2.69 GHz) is constructed and measured. A metamaterial superstrate, composed of stacked S-shaped split-ring resonators, can modify the radiation pattern and exhibit gain enhancement functionality. In addition, the proposed structure can be made in economic 4-layer via-less FR-4 printed circuit...
Diversity and multiplexing can relax the throughput limitations caused by the interference and the frequency-selective channel, respectively. An algorithm that uses the throughput as the selection criterion for switching between diversity and multiplexing is thus proposed in this paper. Owing to the throughput-based switching, the proposed algorithm can always get the largest throughput between diversity...
A printed wideband monopole antenna is proposed for dualband wireless communication. The antenna is a notched patch fed by a coplanar waveguide (CPW) and resembled in a fork shape. The effect of embedded notch on the impedance matching condition has been examined. The proposed antenna has been constructed and experimentally studied. The antenna explores good radiation characteristics including two...
To improve the electrical conductivity of ZnO nanorods, indium-doped ZnO (ZnO:In) is a promising structure. ZnO:In nanorods were grown using vapor cooling condensation method at low temperature through anodic alumina membranes (AAM) in a thermal coater. With assistance of liquid nitrogen cooling system to cool the substrate and vacuum pumping system to provide the molecular rising force, the uniform...
A novel printed ultra-wideband (UWB) Y-shaped antenna is presented in this article. Unlike the conventional Y-shaped antennas, the proposed antenna had a half of stacked Y-shaped antenna dipole that was printed on each side of a microwave substrate respectively. The proposed antenna, which was fed by a 50Ω microstrip line, generates the desired ultra-wideband operation. Prototype designed for UWB...
A printed reconfigurable monopole antenna with frequency diversity, which is suitable for WiFi (2400–2484 MHz) and WiMAX (2500–2690/3400–3600 MHz) band is presented. A SPST (single-pole, single-throw) designed switch using a single series connected PIN (positive intrinsic-negative) diode is attached to the radiating element for frequency diversity. By controlling the states of the PIN diode, the antenna...
A parallel strategy to reduce the heat problem using time-divided operation is presented herein. In addition, the transients during the period of handover are taken into account. Some experimental results are provided to demonstrate the effectiveness of the proposed scheme under given specifications.
The broadband slot antennas with various regular rhombus slots are proposed and studied. Impedance, radiation, and gain characteristics of this proposed antenna are presented and discussed. In this study, it is found that the impedance bandwidth of the proposed antenna can be larger if the size of regular rhombus slot becomes smaller. From experimental results, a slot antenna with a side of regular...
In this paper, we propose and demonstrate a novel type of PCF that has two cladding layers with Ge rods at the center core. The authors numerically show that it is possible to design a single mode PCF with large effective area greater than 200μm2 over the whole wavelength above 1.2μm, The proposed LMA-PCF exhibits a large negative dispersion coefficient from -186 [ps/nm-km] to -158 [ps/nm-km] in all...
Modern personal communication handsets are required to operate at multiple frequency bands for location independent operation and enhanced functionality. This poses an important challenge for antenna designers to build multiband antennas within the limited allowable space. In this paper, a compact PIFA based internal antenna is proposed for GPS, DCS, PCS, UNITS, WiBro, ISMBluetooth and WLAN standards...
A 3-8GHz wide-band low noise amplifier with novel input matching mechanism is presented in this letter. The proposed circuit uses transistor’s intrinsic capacitor Cgd and only one inductor as input matching network to achieve a measured -10 dB input reflection coefficient from 2.75 GHz to 12 GHz. The fabricated wideband LNA achieves a measured average power gain (S21) of about 10 dB and noise figure...
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