Nordiana Mohamad Saaid
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Nordiana Mohamad Saaid
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Nordiana, Mohamad Saaid
Alternative Name
Saaid, Nordiana Mohamad
Saaid, N. M.
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36549058300

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Design and on-body evaluations of a low-cost wearable PIFA for on-body applications

2020 , Azadeh Ahmadihaji , Hadi Aliakbarian , Nordiana Mohamad Saaid , Ping Jack Soh

A flexible low profile textile antenna based on planar inverted-F antenna (PIFA) structure is presented in this paper. This topology has been chosen due to its design simplicity, relatively large bandwidth and the existence of a full rear ground plane, which shields against the effects of the body. The antenna topology which is designed on a 4 mm-thick felt substrate is presented. Conductive textile (Aaronia-shield) is applied as the antenna’s radiator and ground plane due to its light weight, low surface resistance and good conductivity. The antenna performance in free space and bent conditions in the proximity of human body are studied, followed by a numerical investigation on the influence of relative humidity on the textile antenna performance. The fabricated PIFA is assessed experimentally and is found to be in good agreements with the simulation results. Finally, the antenna is attached to a compact RF module and is evaluated on body in a practical environment. The wireless link quality is also evaluated in an indoor laboratory environment.

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Compact low pass filter with deep and wide stopband using H-shaped defected microstrip structure

2017-01-03 , Nur Baya Mohd Hashim , Mohammad Shahrazel Razalli , Siti Zuraidah Ibrahim , Farah Shazuani Mahmu , Nordiana Mohamad Saaid

A deep attenuation level and wide stopband bandwidth, sharp roll-off and low insertion loss in the passband using H-shaped defected microstrip structure (DMS) at open circuit stub resonator (OCSR) of the stepped-impedance low pass filter (SILPF) is presented in this paper. The proposed filter consists of H-shaped that is etching at the microstrip line of OCSR. The OCSR is embedded in the middle of high impedance line of the SILPF. The effect of the applying H-shaped DMS is investigated through parametric studies by comparing H-shaped with Y-shaped and U-shaped. It is observed that the comparison with conventional SILPF shows that the proposed modification filter exhibit a deep and large rejected band of 27 dB attenuation level from 8.21 GHz to 23.16 GHz up to 3 fc. The proposed filter also offers sharp roll-off at 7.31 GHz cut-off frequency and maximum ripple value in the range of DC to 6 GHz is less than 0.35 dB.

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Textile Bowtie patch antenna for potential RF energy harvesting application at GSM 1800

2020 , Nordiana Mohamad Saaid , Soh Ping Jack , S A Baharuddin , H M A Said , M K Abdi , A Hassan Hirey , M F Che Mansor

This paper presents the design and development of a textile bowtie patch antenna for potential RF energy harvesting application using the Global System for Mobile Communication (GSM 1800) band. The size of the antenna is 80 mm × 40 mm, and is designed on a 6 mm thick Felt textile as the substrate and 0.08 mm-thick ShieldIt as its conducting material. The simulated and measured reflection coefficients justified that the bowtie antenna can be used for RF energy harvesting application at 1.8 GHz. This antenna has realized gain ranging from 2.56 dB to 2.55 dB and a total antenna efficiency of -4.3 dB.

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