Po-Chun Cheng

Bio: Po-Chun Cheng is an academic researcher from National Changhua University of Education. The author has contributed to research in topics: Handset & GSM. The author has an hindex of 3, co-authored 4 publications receiving 26 citations.

Multi-Band Printed Internal Monopole Antenna for Mobile Handset Applications

Abstract: An internal multi-band CPW-fed monopole antenna designed for mobile handset applications is proposed. By embedding an open-ended slot and two parallel slits in the ground plane and radiating element, respectively, a triple-band operation measured along VSWR 3 : 1 that is able to cover the wireless applications such as GSM, DCS, PCS, UMTS, WLAN, and WiMAX can be achieved for this antenna. Furthermore, good radiation patterns and stable gain variation are measured over these bands of interest.

Multiband loop antenna design for mobile devices

Abstract: The design of a novel microstrip-fed planar antenna for mobile devices operating within the GSM/PCS/DCS/UMTS band is proposed. Besides covering the WLAN, WiBro, and WiMAX spectra, its multiband features are also capable of operating in the GPS/GLONASS and MSS bands if navigation and satellite telecommunication applications are required. Impedance matching for these cases are simply achieved by tuning the slit embedded in the ground plane directly beneath the microstrip feed line. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2242–2248, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24529

Low-profile multiband planar hybrid antenna design for mobile handset applications

Abstract: A compact size planar microstrip-fed monopole antenna designed for mobile handset applications is proposed. To operate at global system for mobile communication (GSM)/global positioning system/digital communication system/personal communication system/universal mobile telecommunications system and 2.4-GHz wireless local-area network bands, a hybrid technique of joining the horizontal section of a T-monopole to an open-loop back coupling strip and loading a pair of monopole slot into the ground plane is used. Two operating bands are observed (along 3:1 VSWR) with the lower band covering only the GSM application, while the wide upper operating band covers the remaining applications. The effects on the antenna performances by tuning the various vital parameters have also been studied. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:910–915, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25889

Carbon resistant Ni1-xCux-BCZY anode for methane-fed protonic ceramic fuel cell

Abstract: This research aims to develop a better carbon resistant anode compared to conventional Ni-BCZY anode for methane fueled protonic ceramic fuel cell (PCFC). Solid-state reaction process is used to prepare alloy Ni1-xCux-BCZY anode in PCFC. Ni is doped with Cu for better carbon resistance. Results show that, Ni0·9Cu0.1-BCZY anode calcined at 800 °C for 0.5 h exhibit an electrical conductivity of 2054 S/cm at 600 °C, which is 8.4% less than traditional Ni-BCZY anode. XPS, and Raman data show that Ni0·9Cu0.1-BCZY anode exhibit resistance to carbon deposition compared to traditional anode. The best carbon deposition resistance is observed for the Ni0·7Cu0.3-BCZY sample. This work demonstrates the suppression of carbon deposition and inhibition of anode deformation in methane fueled PCFC with Ni1-xCux-BCZY anode. This work is helpful for development of carbon-resistant materials for energy generation with solid oxide fuel cells.

Compact size planar folded pifa design for mobile handset

Abstract: A printed compact size folded inverted-F antenna with simple configuration for mobile handset operating within the global system for mobile communication/personal communication system/digital communication system bands is initially proposed.To additionally cover the wireless local-area network frequency spectrum at 2.4 GHz, a narrow stub is protruded from the printed shorting wall. The excitation of these operating bands with desirable bandwidth is achieved by feeding a 50-Ω microstrip line to the folded radiating element through a via hole. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1045–1050, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25919

A New Low SAR Antenna Structure for Wireless Handset Applications

Abstract: This paper proposes a new mobile handset antenna structure to reduce the value of the speciflc absorption rate (SAR). The antenna is based on the PIFA structure and operates at dual-bands of 0.9GHz and 1.8GHz. The chassis current is reduced using a metallic shim-layer inserted between the patch and chassis. This shim-layer is connected to the handset chassis through posts whose number and positions are determined using optimization techniques. Sidewalls are attached to increase the gain of the antenna and reduce the radiation towards human head. Simulations in the cheek mode show that the SAR reduction factor (SRF) of the proposed structure averaged over 10-g is more than 75% at 0.9GHz and 46% at 1.8GHz. The SRF values obtained using simulations and measurements are found to be better than 51% and 76% at 0.9GHz and 1.8GHz, respectively.

Multifrequency monopole antennas by loading metamaterial transmission lines with dual-shunt branch circuit

Abstract: The theory and design of a new family of multifrequency monopole antennas by smartly loading a set of complementary metamaterial transmission line (CMTL) unit cells are investigated The distributed CMTL elements, epsilon negative (ENG) or double negative (DNG) through incorporating additional capacitive gaps, contain a Koch-shaped extended complementary single split ring resonator pair (K-ECSSRRP) etched on the signal strip The K- ECSSRRP features dual-shunt branches in the equivalent circuit model, rendering a distinguished resonator with dual zeroth-order resonant (ZOR) modes By smartly controlling the element layout and loading difierent numbers of unit cells, ten antennas covering difierent communication standards (GSM1800, UMTS, Bluetooth, DMB and WIMAX) are designed and four of them are fabricated and measured At most of operating frequencies, the antennas exhibit impedance matching better than i10dB and normal monopolar radiation patterns Numerical and experimental results both conflrm that the single-cell or dual-cell ENG and DNG CMTL-loaded monopoles exhibit almost identical dual ZOR modes Moreover, the loaded elements also contribute to the radiation, which is the major advantage of this

Multiband fractal Zigbee/WLAN antenna for ubiquitous wireless environments

Abstract: In this paper, a multiband antenna based on a perturbed Sierpinski Gasket fractal for distributed systems in ubiquitous wireless environments is presented. The antenna enables communication services within the 868/915 MHz ZigBee bands and in the 2.4 GHz WLAN frequencies. The geometrical characteristics of the radiator are determined to fit the electrical and radiation requirements through an optimization approach based on a particle swarm strategy. The prototype performances are assessed through numerical and experimental validations.

A compact planar hexa-band internal antenna for mobile phone

Abstract: A planar hexa-band internal antenna designed for mobile phone applications is presented. The antenna occupying a small area of 45 £ 12mm 2 is placed on the top no-ground portion of the system circuit board with a ground-plane size of 45 £ 100mm 2 . The design begins with constructing a meandered monopole. With a parasitic and an impedance-adjustment structure subsequently added, the resulting antenna can be viewed as a printed planar inverted-F antenna with a parasitic resonant element. Two wide impedance bands can be generated by the designed antenna to support GSM 850, GSM 900, DCS, PCS, UMTS, and 2.4-GHz WLAN operations. The measurement was found to agree reasonably well with the simulation. Design procedures and rules along with the design concepts behind are all presented in detail.

Folded Dual-Loop Antenna for GSM/DCS/PCS/UMTS Mobile Handset Applications

Abstract: A folded dual-loop antenna suitable for GSM/DCS/ PCS/UMTS applications is proposed. It is fabricated using a pair of symmetric meander strips to form two loops. By properly bending the radiating strips, the antenna can achieve a compact size of 50 (L) × 9 (W) × 9 (H) mm3 to be integrated within a mobile handset device as an internal antenna. With 6 dB return loss, two operating frequency bands covering 847-971 and 1670-2230 MHz can be obtained with our design. Moreover, the resonant characteristics of the antenna can be tuned by using various strip lengths and also spaces between the radiator and the ground plane. Experimental results exhibit that the proposed folded dual-loop antenna features nearly good omnidirectional radiation patterns with proper gain, so it is well suitable to meet GSM/DCS/PCS/UMTS operations for mobile handset applications.