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A new formulation for the latency insertion method (LIM) by implicitly substituting the voltages in the currents is presented. LIM is a fast transient analysis technique for large networks. However, due to its explicit formulation, it has a limitation on the time step size to guarantee numerical stability, similar to the finite-difference time-domain technique. This limits the efficiency of the method...
Applications of Microwave Radar imaging based on UWB systems are increasing significantly and the need to design low-cost and efficient system components became vital. In this paper, a novel design for a low-cost baseband sub-nanosecond narrow pulse generator (NPG) is presented. This NPG suits microwave Radar imaging applications like object detection and through-the-wall detection. The design methodology...
Modular Hardware Accelerator (HA) is designed for acceleration purpose which assists CPU (Central Processing Unit) in handling specific task. Modular HA capable to manage multiple engine and communicate them with core processor and main memory through the standard system on-chip (SoC) fabric architecture. The modules of modular HA are Scheduler, Storage, Workload Generator, On-Chip Communication Adapter...
In this paper the tuning of the resonant frequency of a miniaturized cylindrical dielectric resonator antenna (CDRA) is presented. The aperture slot and the metallic top loaded techniques are applied to down shift the required resonant frequency without compromising the antenna performance. The effects of each method to the impedance matching characteristics are highlighted. From the later results,...
In contrast to the sophisticated implementation of binary phase shift keying (BPSK) transmitter using application specific integrated circuit (ASIC), mixer, and local oscillator (LO) for carrier signal; software defined radio (SDR) provides a high performance, efficient, and re-configurable platform to integrate all these individual functions of BPSK transmitter. This paper presents a tutorial exploitation...
This paper presents a simulation study for a new block transmission system that depends on sharing the equalization process between the receiver and the transmitter. The transmitter share will be 75% of the signal processing, while the rest will be done at the receiver. A real time simulation is performed using Simulink to prove the mathematical model. Detailed block diagrams are introduced with description...
In this paper we discuss the influence of thermally annealed Schottky metal contact on DC and RF characteristics of n-GaN Schottky diode. The fabrication of n-GaN Schottky diode started with mesa mask RIE etching and then lift off Al as an ohmic contact annealed at 400degC in N2 ambient for 10 min. For Schottky contact lift off Pt, Ni and Pd Schottky metal annealed from 400degC to 600degC for 10 min...
In this paper, dielectric resonator antenna operated at 3.5 GHz was design and simulated using CST Microwave Studio and subsequently fabricated. Direct microstrip line of 50 Omega was used as the feeder. In this design, rectangular shape was used as the dielectric resonator as it offers more option to control the resonant frequency. The position of rectangular DR was varied to determine the best coupling...
This paper presents Chebyshev three and four poles microstrip hairpin filter for radar applications. The filters are operated at K-band frequency segment of 20-20.3 GHz. The filters were designed using Genesys software and implemented on Roger 5870 substrate. The results from simulation and measurement show that both filters were operating at the desired specification. Based on the experimental analysis,...
This paper described the design, simulation and fabrication of a parallel-coupled band pass filter. The design was for K-band applications with bandwidth of 300 MHz. The filter was operated between 21 to 21.3 GHz. The circuit was designed and simulated using Genesys and the measurement was carried out after fabrication on RT Duroid 5870 with 0.508 mm thickess and the dielectric constant, epsivr of...
In this paper, small dielectric resonator antenna was design and developed by using high permittivity dielectric material of 55. The dimensions of the dielectric resonator were 5.4 mm (width), 9.3 mm (length), and 3.14 mm (height). This DRA operate at a frequency around 5 GHz. It was excited with microstrip line where the position of the DR on the microstrip was varied to get good coupling. CST Microwave...
This paper presents a simulation study for code-division multiplex system over time varying channels. The scheme investigated here uses a precoding technique in the transmitter depending on the channel information, so that no need for any signal processing in the receiver rather than testing against a certain threshold. This coding technique minimizes the effect of intersymbol interference (ISI)....
This paper provides suitable design method to achieve high efficiency of single balanced amplifier based on load pull technique. The device technology is using pseudomorphic High Mobility Electron Transistor (pHEMT) having gate-width of 6400-mum. Power-aided-efficiency (PAE) of 60-70 %, output power of 1 W and gain of 14 dB for the entire range 1-1.5 GHz is achieved at simulation level. Degradation...
This paper will discuss the design and implementation of the digital up converter (DUC) in Field Programmable Gate Array (FPGA). DUC is a digital circuit which generating digital intermediate frequency (IF) signal from low complex digital baseband signal. The DUC provides pulse shaping, interpolation and frequency translation where the up-sampled signal is shifted from centered frequency (0 Hz) to...
This paper presents a simulation study for code-division multiplex system, over time varying channels. The scheme investigated here uses a sharing technique for the signal processing unit between the transmitter and the receiver to improve the performance of the system. This technique minimizes the effect of inter-symbol interference (ISI). The data itself is transmitted in the form of blocks of data...
Two segment rectangular dielectric resonator antenna of high permittivity (epsivr = 30) ceramic material was design and fabricated at C-band. The antenna was fed with 50Omega microstrip transmission line. In this design, both dielectric resonators (DRs) are separated with metal plate which acting as shorting post. The length of the two DRs is 7.7 mm and 2.2 mm respectively. The optimum distance from...
4-stage distributed power amplifier (DPA) employing tapering the drain load networks to achieve high efficiency is reported. The active device with enhancement mode pHEMT (pseudomorphic High Electron Mobility Transistor) technology is used. Measurement results of 600 mW, 30 % of power-aided- efficiency (PAE) and gain of 10 dB is achieved within frequency range of 10-1800 MHz. Low supply voltage of...
Designing a high-linearity, high-efficiency RF power amplifier with wide bandwidth design is a real challenge. This article explores a technique to achieve 30 dBm output power with an adjacent channel power ratio (ACPR) of more than -65 dBc for frequency range of 800-900 MHz. A three-stage gallium arsenide heterojunction bipolar transistor (GaAs HBT) RF power amplifier with Cartesian feedback in closed-loop...
In this approach, the performance of CDMA system for transmission of digital data over time varying channels such as the HF mobile channels is improved. This approach is based on implementing considerations depends on block transmission techniques. The main idea presented here is to divide the equalization process between the transmitter and the receiver of the system with a certain ratio that maximize...
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