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Recent technology advance in wireless sensor networks (WSNs) has enabled the growth of various applications that can assist or enhance existing systems. For instance, the technology provided by IEEE 802.15.4 protocol that operates in 2.4GHz ISM band is suitable to be used in many applications since it is a low cost and low power wireless communication. In this paper, we present a performance study...
Malaysia is well known for its wet tropical climate and monsoon seasons which bring rainfall almost throughout the year. Therefore, designing wireless communication links above 10 GHz for Malaysian weather involves study of rainfall rate and its integration time. The knowledge of local 1-min rainfall rate statistic is the key input for the estimation of signal attenuation due to rain. Due to limitation...
The objective of this presentation is to illustrate that an electromagnetic macro modeling can properly predict the path loss exponent in a mobile cellular wireless communication. This represents the variation of the path loss with distance from the base station antenna. Specifically, we illustrate that the path loss exponent in a cellular wireless communication is three preceded by a slow fading...
This paper presents the design, measurement and results of a square-shaped microstrip antenna on wall for a passive RFID tag compliant to EPC Global Class 1-Gen2. The tag antenna operates at the European Ultra-High Frequency (UHF) band and is excited by a dual inset feed network to achieve Circular Polarization (CP). The antenna size is reduced as well as the CP bandwidth is extended by inserting...
An incredible working concept for a transparent communication technology has provided a glimpse into the future of consumer technology which is rapidly advent in communication systems. Widespread use of this technology, leads engineers to design cheaper and simpler communication equipments. A major hurdle in adapting the technology to smaller screens stems from physical constraints is realized through...
Antenna coupled Infrared (IR) detectors attracted many authors for its promising room temperature operation, high speed, CMOS compatibility and low design complexity. Due to many factors, however, sever losses are introduced limiting the detectivity of these devices. One of the major sources of these losses is the substrate modes. We present for the first time a design simulation for a spherical reflector...
In this paper, a circularly polarized, high gain, patch antenna with low axial ratio dedicated for S band nanosatellite communications is presented. Four asymmetric V-shaped slits in the diagonal directions on the square patches and a parasitic element are introduced to create circularly polarized (CP) radiation with a large axial ratio beamwidth. A prototype of the antenna was developed with a 1...
Ka-band is an emerging band for future satellite operators because of the increase in demand for capacity, availability as well as its applicability for broadband services. This submission attempts the implementation of the Ka-band (21.4 – 22.0) GHz Radial Line Slot Array (RLSA) antenna design using CST MWS 2013. Simulations results are presented and compared with the Ku-band DBS receive (12.25 –...
This paper analyzes the characteristics of two cylindrical posts placed in the cross section of a rectangular waveguide based on the mode matching technique. Three methods to approximate the posts are introduced: equal width method, arithmetic sequence thickness method and equal sector method. The scattering parameter convergence of these approximation methods is investigated. Meanwhile, through comparing...
This paper presents an analysis of electromagnetic flux capability on a new 12Slot-14Pole outer-rotor hybrid excitation flux switching machine (ORHEFSM). In this proposed machine, all the magnetic flux sources are placed on the stator resulting for robust machine and suitable for high speed application. Moreover, coil test analysis, permanent magnet (PM) and DC field excitation coil (FEC) flux characteristic,...
This paper presents the design of wideband antenna integrated with triple band artificial magnetic conductor (AMC) ground plane. The wideband antenna that acts as Reference Antenna (RA) operates from 2.69 GHz up to 6.27 GHz while the triple band AMC operates at 2.3 GHz, 5.8 GHz and 8.3 GHz. The investigation is carried out to observe the capability of triple band AMC to excite at least three new narrowband...
The potential application of Defected Ground Structure (DGS) for isolation improvement of series discrete PIN diode switch is proposed in this paper. A square dumbbell DGS was selected for this application where it was connected in parallel with a single series discrete PIN diode. By realizing the circuit using FR4 substrate, the simulated and measured result clearly show that the isolation of the...
In the recent years, many heuristic optimization algorithms derived from the behavior of biological or physical systems in nature have been developed. In this paper, we propose a new optimization algorithm based on competitive behavior of group animals. The competition gradually results in an increase in population of wealthy group which gives a fast convergence to the optimization algorithm. In the...
This paper present the investigation on wearable textile slot antenna under flat and curvature conditions in free space. The antenna can be used for smart clothing at 2.45 GHz Industrial, Scientific and Medical (ISM) band. A 0.78 mm denim fabric is used as the substrate. A monopole antenna is patented on the fabric with a ground plane at the other side. The monopole and the ground is made of a 0.17...
It has been discovered that the asymmetrical elements' length of upper and below truncated edges are the new parameter to fulfill the requirement of circular polarization (CP). The proposed antenna has a simple structure, consists of 2 × 2 patch antenna as its radiating elements and a single coaxial connector at the ground layer is used as a feed. The dimension of each patch antenna is 25.65 mm ×...
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