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Shah Alam, Malaysia

Ali M.T.,Antenna Research Group ARG | Awang Z.,Antenna Research Group ARG | Awang A.H.,Antenna Research Group ARG
Progress In Electromagnetics Research B | Year: 2014

The fabrication of single square patch antenna for proposed Leucaena Leucocephala ("Petai Belalang") Wood Plastic Composite (WPC) substrate board (PB Substrate board) and FR4 substrate board is presented in this paper. The experiment objective is to measure the performance of an antenna fabricated on the FR4 and PB substrate (proposed substrate) by comparing the performance in terms of material's dielectric constant and electron mobility and antennas' loss tangent, return loss (S11), radiation pattern and practical antenna transmitting performance. The new substrate compositions of Leucaena Leucocephala stem and polypropylene (PP) are 30% and 70% consecutively. The result for 150μm (sample B) indicates stability on most dielectric constant ("r = 3:02), loss tangent (tan±=0:029) and electron mobility (5:31£103 cm2/Vs), with the consistency of antenna result, between simulation and measurement. All results obtained will be analyzed and displayed in the form of data and graphs. Source


Azlan A.A.,Antenna Research Group ARG | Ali M.T.,Antenna Research Group ARG | Awang M.Z.,Antenna Research Group ARG | Ramli N.,Antenna Research Group ARG
RFM 2013 - 2013 IEEE International RF and Microwave Conference, Proceedings | Year: 2013

The fabrication of single patch antenna for proposed Leucaena Leucocephala ('Petai Belalang') Wood Plastic Composite (WPC) substrate board and FR4 substrate board is presented in this paper. The experiment objective was to measure the performance of an antenna fabricated on the proposed board by comparing the performance in term of Dielectric Constant value, Tangent Loss value, Return Loss, Radiation Pattern and Gain with antenna fabricated onto FR4 material substrate board. The idea is to find the potential alternative board replacing conventional printed circuit board (PCB) using commercial FR4 material. The dielectric constant and tangent loss value for both proposed and FR4 substrate board were analyzed with Agilent 85070E Dielectric Probe Kit method. The Fabricated proposed boards were studied in the frequency range of 2.2 to 3.3 GHz since this board will be used in ISM band application that occupied 2.45 GHz frequency spectrum. The parameter composition of proposed board on this paper was focused only on one density composition that is 70% of polypropylene and 30% of leucaena leucocephala filler wood with particle size maintained at 150 μM and moisture content of the filler is less than 5%. The indoor Practical Antenna Measurement method was used to prove the proposed antenna can be used as transmitting antenna and all result obtained were form as data and graph analysis. © 2013 IEEE. Source


Ramli N.,Antenna Research Group ARG | Ali M.T.,Antenna Research Group ARG | Yusof A.L.,Antenna Research Group ARG | Muhamud-Kayat S.,Antenna Research Group ARG
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2013

This paper presents a novel design of frequency-reconfigurable antenna by using an aperture-coupled technique as feeding technique and stacked patch technology. The proposed antenna generally consists of three substrate layers (RT-Rogers 5880) and air gap filled between feedline substrate and layer 2 substrates. Four PIN diode (BAP51-02) switches are implemented to configure the length of the feedline by configuring the switches to ON or OFF mode. A new approach of coupling methods is presented. When all the switches are in ON mode, the signal will be passed to the selective aperture slot and activate the particular radiating patch layer to achieve the frequency reconfigurability either at 2.6 GHz or 3.5 GHz. The prototype of the proposed antenna is tested/fabricated with the biasing circuit to validate the performance of the antenna. The simulated and measured results are presented to confirm the performance of the antenna. © 2013 IEEE. Source


Ramli N.,Antenna Research Group ARG | Ali M.T.,Antenna Research Group ARG | Yusof A.L.,Antenna Research Group ARG | Islam M.T.,National University of Malaysia | Muhamud-Kayat S.,Antenna Research Group ARG
Progress In Electromagnetics Research C | Year: 2014

This paper presents a frequency and pattern reconfigurable stacked patch microstrip array antenna fed by aperture-coupled technique. The antenna consists of three substrate layers with radiating elements sorted at substrate layer 1 (top patches) and substrate layer 2 (bottom patches). The layers have different sizes to indicate different operating frequencies. On the ground plane, the four sets of two different aperture slot shapes (I-shaped and H-shaped) are used to transfer the wave and signal to particular radiating elements during the PIN diode switches configurations. The I-shaped slots are used to activate the bottom patches while the H-shaped slots are used to activate the top patches. Four PIN diode switches are placed at the feed line, positioned between the I- and H-shaped slots. Next, by changing the PIN diode switches configuration to ten cases, the proposed antenna has capabilities to change the operating frequencies and the pattern characteristics itself. The measured results of return loss, gain and radiation patterns are slightly shift compared to the simulated results. Source


Kayat S.M.,Antenna Research Group ARG | Ali M.T.,Antenna Research Group ARG | Salleh M.K.M.,Antenna Research Group ARG | Rusli M.H.M.,University Technology of MARA | And 2 more authors.
RFM 2013 - 2013 IEEE International RF and Microwave Conference, Proceedings | Year: 2013

This paper presents a novel structure of frequency reconfigurable truncated rhombus-like slotted antenna (FRTRSA). The structure consists of a slotted ground plane with a thickness of ho sandwiched between two different substrates of different thicknesses, h1 and h2. The upper substrate has lower dielectric constant, erl than the bottom substrate, er2. Unlike a conventional antenna which provides only one frequency per antenna, the proposed antenna is focused to operate at two different frequencies in a single antenna by using corporate feed array configuration. A 'zig-zag' slot which is embedded at each radiating patch at two different orientations in x- and y-axis has significantly influenced the excitations of the resonant frequencies. Therefore, the uniqueness of the antenna is that it has the same patch size although two different frequencies are achieved. The antenna is integrated with the PIN diodes at its feed network to reconfigure the desired frequency. CST Microwave Studio has been used for design simulation and optimization. Simulated and measured results are presented and both results are in a good agreement. The results confirm that the antenna can be reconfigured at two frequency modes, F1=5.3GHz and F2=5.8GHz. The proposed antenna has given a great advantage on the lower frequency with patch size reduction of 37.09%. © 2013 IEEE. Source

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