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A compact dielectric resonator antenna for ultrawideband vehicular communication applications is proposed. Two cylindrical dielectric resonators are asymmetrically located with respect to the center of an offset rectangular coupling aperture, through which they are fed. Optimizing the design parameters results in an impedance bandwidth of 21%, covering the range from 5.9 to 7.32 GHz in the lower band...
An arc-shaped planar-monopole two antennas for WLAN and WiMAX application is proposed. The lengths of the two arcs are designed to meet the requirements for the WLAN and WiMAX standard sat 2.45GHz and 3.5GHz respectively. The separation between centers of the two feed lines is 14 mm (0.098 wavelengths at 2.45GHz).A new technique is proposed to reduce the mutual coupling between the two closely-spaced...
Two dielectric resonators antenna (DRA) fed through slotted microstrip line for a wideband application is proposed. The two cylindrical DRs are asymmetrically situated with respect to the rectangular coupling aperture center with a defected ground plane. By optimizing the design parameters, two antenna configurations have been achieved: the first covering an impedance bandwidth of about 57%, from...
A compact design of balanced antenna operates in the LTE bands of 700/2600MHz is presented. The present antenna is a type of zigzag printed shapes. These zigzag strips were printed over RF4 substrate permittivity of 4.4 and full dimensions of 50 × 11 × 0.8 mm3. The results were simulated, and the performance showed that the zigzag approach was able to enormously reduce the antenna size by a factor...
Evolutionary optimization techniques with multiple objectives are applied to the design of microstrip antennas. The biologically inspired algorithms, Particle Swarm Optimization, Genetic Algorithms and the Firefly Algorithm, are integrated in new software, Antenna Optimizer, which combines attributes of the electromagnetic design environment of CST Microwave Studio with those of the technical computing...
A new compact dual-band balanced antenna is proposed with meandered lines operating in the LTE bands of 700/2600MHz. It has a compact size with the overall dimensioning of 54×18× 8 mm3, in which can be simply concealed within mobile handsets. Techniques such as meandered lines are used in order to accomplish a well-matching and size reduction of antenna. The meander lines were printed on FR4 substrate...
A compact dielectric resonator antenna (DRA) for wideband applications is proposed with a slotted microstrip line antenna. Two cylindrical dielectric resonators, which are asymmetrically located with respect to the center of rectangular coupling aperture, are feds through the aperture of the ground plan. By optimizing the design parameters, an impedance bandwidth of about 46%, covering the frequency...
In this paper the I shape antenna considered as CPW-Fed antenna type is loaded with zero order resonator (ZOR) for miniaturization effect, the antenna contains one slot as monopole bar related to the I shape antenna, the antenna is loaded with zigzag resonator (ZR) inserted between the two parts of the I shape antenna, an inter-digital capacitor is incorporated inside the lower part of the antenna...
In this paper, long-term meteorological data are measured using six fixed surface weather stations and one radiosonde in the subtropical Arabian Gulf region, in particular United Arab Emirates (UAE). The surface refractivity profiles, Ns, and refractivity extrapolated to sea level, No, obtained from surface meteorological data using both fixed and radiosonde stations are investigated and compared...
A novel multi-standard dual-wide band filter with a compact size of only 8.8 mm by 16.8mm is designed and developed for transceiver devices. The proposed filter has a fundamental bandwidth of 1.6GHz with fractional bandwidth (FBW) of 29.7% centered at the 5.4GHz band, and second bandwidth of 300.0MHz with FBW of 3.6% centered at the 8.15GHz band. The basic dual-wide bandwidth is attributed to the...
Radio Frequency Identification (RFID) systems has gained increasing popularity with multiple deployments to existing wireless sensors in a view to achieve energy and overall operational efficiency at a much lower cost. This paper presents the design and analysis of a UHF (860–868MHZ) passive tag using HFSS (High Frequency Structural Simulator) platform. It explores specific tag geometry characteristics...
In this paper we review a class of the Continuous Phase modulation (CPM), namely, the Quaternary Frequency Shift Keying (CP-QFSK) signaling and investigate its suitability for the application in mobile radio systems. This type of modulation renders its self as a spectrally efficient scheme that is currently used in a wide variety of applications ranging from communications systems to sonar, geophysics,...
This paper addresses the design and optimisation of a physically small and cost effective printed antenna for full-band UWB radio applications. A genetic algorithm assisted optimisation is used to achieve the physical dimensioning and full-band operation. The antenna is realized as a printed slot cut radiator fixed over a trapezoidal ground plane, the antenna dimensions are 21.6mm × 18.8mm × 1.6mm...
In this paper, seventeen years of radiosonde meteorological data from 1997–2013 are analyzed for the subtropical Arabian Gulf region. The upper air refractivity, Nh, and vertical refractivity gradient, ΔN, are determined in the low troposphere using existing linear and exponential relationships in the literature. The study focusses on three layer heights at 65 m, 100 m and 1 km above ground level...
In this paper, class F power amplifier covering a wide dynamic range with a steady gain for non-constant envelope signal used in CDMA systems is designed and studied. The design principle is attempted to operate at high values of peak to average power ratio likely to be up to PAPR = 10dB in such systems. The design also takes care of improving the adjacent channels interference ratio (ACPR) of such...
This paper presents a novel design of microstrip-fed pentagon patch monopole antenna for ultra wideband (UWB) applications. This antenna consists of a pentagon patch with suitable dimensions on the upper side of a dielectric substrate; a 50-Ω microstrip feed line and a slotted ground plane. Numerical analysis for the antenna dimensional parameters using CST Microwave Studio is performed and presented...
Finite impulse response (FIR) digital filters are extensively used due to their key role in various digital signal processing (DSP) applications. Several attempts have been made to develop hardware realization of FIR filters characterized by implementation complexity, precision and high speed. Field Programmable Gate Array is a reconfigurable realization of FIR filters. Field-programmable gate arrays...
In this paper, low profile planar Metamaterial-Inspired coplanar fed waveguide antenna is presented for WLAN and Ultra-Wideband applications. The antenna is based on a simple strip loaded to a rectangular patch and zigzag E-shape metamaterial-inspired unit cell. The idea behind the proposed antenna is to enable miniaturization effect. The proposed antenna can provide dual band operation, the first...
In this paper a distributed authentication scheme based on independent session key per access network (HOISKA) is proposed for the decentralized multi-service group key management scheme in a wireless multicast environment. It enables a handover user Mi involved in multiple multicast service subscriptions to establish the long term credential from the trusted authentication server (As) during initial...
Dynamic Spectrum Access (DSA) for secondary usage of underutilized radio spectrum is currently of great interest for radio regulatory authorities and for cellular network operators. However, the co-existence of multiple devices operating in the same bands, such as wireless microphones which also operate in TV bands, poses a challenge to DSA. Efficient and proactive spectrum sensing could prevent harmful...
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