Azremi Abdullah Al Hadi, Assoc. Prof. Ts. Dr.Dean of Faculty of Electronic Engineering Technologyhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/657222024-03-28T13:58:21Z2024-03-28T13:58:21ZImpedance Analysis of Mobile Phone Antenna in the Presence of User's HandNur Basyirah, A RahmanAzremi Abdullah, Al HadiSaidatul Norlyana, Azemihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/692662021-01-07T09:28:45Z2017-01-01T00:00:00ZImpedance Analysis of Mobile Phone Antenna in the Presence of User's Hand
Nur Basyirah, A Rahman; Azremi Abdullah, Al Hadi; Saidatul Norlyana, Azemi
User interaction (UI) has been identified to degrade the performance of the antenna. A system that measures impedance characteristics of a planar inverted-F antenna (PIFA) when there are user interactions is designed using Keysight VEE Pro. The operational frequencies of the antenna are 900 MHz and 1800 MHz at low band and high band, respectively. The obtained results are compared and then a new impedance matching circuit is proposed and designed by using ADS (Advanced Design System). The proposed matching circuit at each operating frequency is a basic lumped circuit using the L network. Both simulation and experimental work have been done.
Link to publisher's homepage at https://www.matec-conferences.org/
2017-01-01T00:00:00ZHelical Antenna sensor for Different Liquid Type IdentificationWaleed Majdi Issa, IkhmisSaidatul Norlyana, AzemiAzremi Abdullah, Al-HadiPing Jack, SohMohd Faizal, Jamloshttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/692512021-01-06T01:00:42Z2017-01-01T00:00:00ZHelical Antenna sensor for Different Liquid Type Identification
Waleed Majdi Issa, Ikhmis; Saidatul Norlyana, Azemi; Azremi Abdullah, Al-Hadi; Ping Jack, Soh; Mohd Faizal, Jamlos
There are variety of lliquid sensor measurement systems that available in the market nowadays. It is used to measure various parameter for wide range application or to address a specific application. However, most of the existing monitoring system still involved bulky equipment and required a quite amount or liquid to be tested. The results obtained time consuming and take a long time to obtain the desired results. To solve the problems, we develop and design a small sensor using antenna that is small, robust as well as reliable and efficient to work as a sensor for liquid sensor detection. It is efficient and reliable to obtain in-situ result. The helical antenna is design using CST Software and the fabricated antenna is measured. The helical antenna works on 2 GHz frequency is tested with three different type of liquids and it is shows different liquid has their own frequency shift.
Link to publisher's homepage at https://www.matec-conferences.org/
2017-01-01T00:00:00ZDual Band Planar Inverted F Antenna (PIFA) with L-Shape ConfigurationMohamad Khlouf, MunzerSaidatul Norlyana, AzemiAzremi Abdullah, Al-HadiSoh, Ping JackMohd Faizal, Jamloshttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/692492021-01-06T00:55:28Z2017-01-01T00:00:00ZDual Band Planar Inverted F Antenna (PIFA) with L-Shape Configuration
Mohamad Khlouf, Munzer; Saidatul Norlyana, Azemi; Azremi Abdullah, Al-Hadi; Soh, Ping Jack; Mohd Faizal, Jamlos
One of the most used antennas in mobile devices is planar inverted F antenna (PIFA). PIFA can be design in dual band frequencies due to the coverage of the wireless service in a mobile device that requires a multiple frequencies. However, the consideration of technical operation has to be combined with an evaluation of the antenna radiation impact on the users. A procedure of PIFA work in GSM (867-960MHz) and GSM (1710-1899MHz) is done using CST Software. The dual band frequency response is obtained by means of an insertion of an L-shaped slot, which is use to tune the operation frequencies. The prototype of the antenna is fabricated as model by CST Software and evaluated. It is found out that the PIFA antenna has a good efficiency, bandwidth as well as produce a maximum gain for the antenna. A key and innovative research is still underway to broaden performance parameters of the antenna.
Link to publisher's homepage at https://www.matec-conferences.org/
2017-01-01T00:00:00ZA review of antennas for Picosatellite applicationsAbdul Halim, LokmanSoh, Ping JackSaidatul Norlyana, AzemiHerwansyah, LagoPodilchak, Symon K.Chalermwisutkul, SuramateMohd Faizal, JamlosAzremi Abdullah, Al-HadiAkkaraekthalin, PrayootGao, Stevenhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/686222020-11-05T04:00:32Z2017-01-01T00:00:00ZA review of antennas for Picosatellite applications
Abdul Halim, Lokman; Soh, Ping Jack; Saidatul Norlyana, Azemi; Herwansyah, Lago; Podilchak, Symon K.; Chalermwisutkul, Suramate; Mohd Faizal, Jamlos; Azremi Abdullah, Al-Hadi; Akkaraekthalin, Prayoot; Gao, Steven
Cube Satellite (CubeSat) technology is an attractive emerging alternative to conventional satellites in radio astronomy, earth observation, weather forecasting, space research, and communications. Its size, however, poses a more challenging restriction on the circuitry and components as they are expected to be closely spaced and very power efficient. One of the main components that will require careful design for CubeSats is their antennas, as they are needed to be lightweight, small in size, and compact or deployable for larger antennas. This paper presents a review of antennas suitable for picosatellite applications. An overview of the applications of picosatellites will first be explained, prior to a discussion on their antenna requirements. Material and antenna topologies which have been used will be subsequently discussed prior to the presentation of several deployable configurations. Finally, a perspective and future research work on CubeSat antennas will be discussed in the conclusion.
Link to publisher's homepage at https://www.hindawi.com/
2017-01-01T00:00:00Z