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A dual band coaxial fed slotted microstrip patch antenna for THz application on FR4_epoxy substrate using T shape patches is designed and analysed. Slots are made by symmetrically cutting a copper sheet. Implementation of this structure offers a better directivity and radiation efficiency. Full wave simulation results showed that the THz band slot antenna works at 0.6326 THz and 0.8702 THz. Maximum...
In this paper the presented research work analyzes the effects of electromagnetic (EM) radiation of mobile phone on human head. The EM radiation is measured based on Specific Absorption Rate (SAR). The human head is generally exposed to mobile phones operating at communication (GSM, CDMA etc) frequency bands. The radiation absorption analyzed through simulations by applying frequency domain using...
In this paper, a multi-band micro-strip patch antenna with uneven parallel slots and optimized gain is proposed. Two types of substrate such as air and FR4 are used in the design. A detail parametric study of the patch antenna are carried out with air substrate. Co-axial feeding is used for optimal antenna characteristics. Consequently air substrate is changed with FR4 substrate and microstrip line...
This report presented a beam steering dipole antenna on incorporate polymeric and High Impedance Surface (HIS). In order to achieve the reconfigurability, two radio frequency (RF) switches are implemented on the antenna. By manipulating the RF switch state, the antenna is capable of reconfiguring its beam into two different directions at 28° and −28°. The RF switch will affected the antenna gain due...
A rectangular shaped defective ground structure (DGS) is proposed to enhance the response of an existing design of a dual-band bandpass filter topology. In this paper, the filter design is based on parallel-coupled lines connected to transmission lines. The filter consists of characteristics impedances of the transmission line represented by Zr, even-mode, Zre and odd-mode, Zro. The variation of the...
A Wave Concept Iterative Procedure (WCIP) based on transverse waves formulation is presented. This method is applied to analyze annular microstrip patch antennas on anisotropic substrates. The use of FFT algorithm to define a fast modal Fourier transform results in accurate solutions with significant savings in computation time and memory requirements. WCIP results are compared with the HFSS simulation...
In this paper, a circularly polarized antenna is presented for small satellite communication. The proposed antenna is assimilated with an octagonal shape radiator with rectangular cut-outs on opposite edges. The proposed antenna is fed by a coaxial pin. The antenna shows measured −10dB impedance bandwidth of 610 MHz (7.07–7.68 GHz) with 3dB axial ratio (AR) bandwidth of 260 MHz (7.35–7.61 GHz).
Growth of titanium dioxide (TiO2) nanowires was studied on the seed layer of TiO2 through hydrothermal growth method. Here, the growth of nanowires TiO2 on Si (100) substrates by using the two steps method. Different seed layers of TiO2 were prepared by using sol-gel method, deposited by spin coating and annealing, followed by the growth of TiO2 nanowires by using the hydrothermal method. Acetic acid...
A novel micro tactile display device to display the elasticity of human soft tissues is presented in this paper. The device consists of 16 units in the form of a 4 × 4 units array. Each unit consists of two substrates separated by a 1.75 mm spacer. The first substrate holds a stiffness display pin (1 mm × 1 mm) which is supported by two Shape Memory Alloy (SMA) springs in parallel to provide tunable...
In this paper, the patch antenna with polarization reconfigurability feature is proposed. The antenna composed of circular patch on the top substrate embedded with four equal-length slits, and is fed at the diagonal of the structure using the coaxial fed technique. To obtain the reconfigurability feature, four switches (copper strips) are appropriately located at the specific position across the slit...
This paper presents an analysis of a Left-Handed Circular Polarization (LHCP) wearable antenna with different textile material (substrates) for Global Positioning System (GPS) application. The proposed antennas have achieved circular polarization (CP) by truncating two opposite edged of the square patch for all designed antennas with three different substrates. The analysis is focusing on using felt,...
Graphene on silicon with silicon dioxide quantum dots is a promising opto-electronic material. The optical band gap and the corresponding optical conductivity are estimated using the density functional approach with the combination of molecular dynamics. The regular repeating unit cell of graphene silicon nano-texture is identified using the classical molecular dynamics simulations. Electronic calculations...
In this paper, a new wideband Circular monopole antenna is proposed for Wireless communication. Commercially available finite difference time domain (FDTD) based software Computer Simulation Technology (CST) microwave studio has been adopted in this investigation. A wide frequency bandwidth of 3.25 GHz (1.65 GHz to 4.9 GHz.) has obtained in measurement. The operating frequencies of the proposed antenna...
In this paper we report an investigation on the possibility of using graphene nano-ribbon (GNR) as a conductive material in MMIC applications in the range of 2–20 GHz. GNRs provide an advantage to the applications of MMIC transmission lines, as the line impedance can be controlled by their dimensions. The structural characteristics of graphene films grown on Ni film deposited on Si/SiO2 wafers after...
NEGs(non evaporable getters) when coated as thin film on the inner wall of vacuum pipes or chamber play vital role in the evacuation of a sealed off system after heating it to activation temperature. It creates the uniformity of pressure between two long pipes where pumping is not possible at each and every part. Ternary coating of materials Ti, Zr and V has prepared on SS304L by DC-magnetron sputtering...
In this paper, a broadband single-layer microstrip reflectarray element composed of a split double ring patch printed on composite substrate of low-cost, lossy materials FR4 and foam is presented and compared with the double square ring patch. The analyses are performed using the CST Microwave Studio software package. The proposed structure offers a slope value of 60°/mm, while the phase range is...
A sensing circuit is presented for a portable/handheld semiconductor based radiation sensor, which senses low current changes without the inclusion of transistor noise issues. This circuit design block was implemented using supporting circuit architectures to enable sensing between 33pA to 1nA using low voltages. Additionally, a unique circuit topology is presented by which the effect of radiation...
The fabrication of precise hemispherical shape is challenging with standard planar lithography techniques. A suitable alternative is the fabrication by inkjet printing. This paper presents a method based on drop-on-demand inkjet printing on pre-patterned silicon substrates allowing the controlled fabrication of SU-8 hemispherical cup-like structures with inner cavities of sub-nano-liter volumes. Examples...
New developments in reflectarray research at the Communications Research Centre Canada will be presented. These developments focus on many areas such as: development of efficient methods for analysis and synthesis of reflectarrays, innovative cell elements, low cost, and wideband reflectarray. The paper gives a brief overview of these topics and a more detailed presentation will be given at the conference.
The structural and optical properties of annealed CdS are studied in this work. The CdS films are deposited on ITO coated glasses by sputtering at different substrate temperatures and subsequently annealed in an O2/N2 ambient. It has been observed from XRD diffraction that the films show a trend of conversion from poly crystalline to amorphous or mixed phases after annealing. The films fabricated...
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