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This paper presents a design of microstrip directional coupler without the prior knowledge of the physical geometry. The design method requires only the information of the port impedances, coupling and operational frequency. The results are verified through simulation.
This paper proposes two new multi-section dumbbell-shaped defected ground plane structures (DGS). The defects are created in the ground plane of the conventional single-layer microstrip transmission line. The proposed DGSpsilas application in microwave filtering is investigated. It turns out that these new DGSpsilas can be used to realize notch filters (i.e. narrow-band band-stop filters) with steep...
Integrated mixed signal electronics combining analog, digital and radio frequency circuits is being used to realize beyond-leading-edge components and systems on a chip with revolutionary performance and high levels of functionality. This talk will provide an overview of integrated microsystem development and associated material and device technology. Specific examples will include reconfigurable...
In view of the trend in and requirement of microwave tubes, it is necessary to identify areas and involve academia in research and development with national laboratories and industries through sponsored projects. All concerned in the community established academic institutions, national laboratories, industries, and users must exploit the huge potential in large number of engineering college students...
A two stage high gain small signal amplifier for GPS based receiver application is designed and realised using SiGe heterojunction bipolar transistor (HBT). The measured gain and noise figure is 33.5 dB and 2.9 d B respectively at Vce of 2 V, and total current of 10 mA. The circuit is fabricated on microstrip configuration using RT duroid substrate of dielectric constant 10.5 and height 50 mils. This...
Volterra series is a powerful and accurate method, for weakly nonlinear circuit analysis. According to precision and efficiency of available methods, using this method, seems to be necessary in such circuits. Nonlinear current method, an approach in Volterra series method, is used to analyze an amplifier. An amplifier is designed and is analyzed through Volterra series method. Finally, the results...
Artificial neural networks (ANNs) have been promising tools for many applications. In recent years, a computer-aided design approach based on ANNs has been introduced to microwave modelling, simulation and optimization. In this work, the characteristics parameters of edge coupled coplanar waveguides (CPWs) have been determined with the use of models. These neural models were trained with LM, BR, QN,...
We present a model on the based of K.C. Gupta proposal for inductance and capacitance for epsivr = 9.6 epsivr = 4.0 respectively for single layer and compare the numerical calibration with de-embedding techniques used in the planar electromagnetic (EM) simulation (SONNET) for epsivr = 2.3, 4.0, 15.1, 20.0 & 40.0. We change the model for multilayer and compare with present model for epsivr = 12...
A variable high power microwave system, wherein output power can be varied from 0.6 kW to 5 kW at a nominal frequency of 2450 MHz has been designed and developed for processing of material in liquid form. Two applicators have been developed for the processing of material. One is a rectangular multimode cavity for batch processing. The second one is cylindrical cavity with tubes for continuous operation...
Summary form only given. Microwave technology was considered as a war time secrecy initially and it was just after the golden period (1935-1945) of Microwaves, its applications started encompassing the non-military fields as well. Since then, the entire Microwave field has undergone tremendous revolution and gone through a ses change. The first planar transmission line dasiaStrip transmission linepsila...
In most devices on printed circuit boards (PCBs), there are many types of micro strip transmission line and coplanar waveguide (CPW) discontinuities, such as steps, air gaps, bends, etc. These discontinuities have strong effects on the signal transmission and reflection. In certain cases, this disruption of the normal fields of the line result in current crowding leading to storage of magnetic energy,...
A new wide-band direct conversion receiver based on Five-port structure is presented that is very suitable for software radio applications. New five-port structure consists of five wideband power splitters and a 900 phase shifter, including a set of composite right/left-handed (CRLH) transmission line (TL) sections. As an example the transceiver is designed for covering three WiMAX frequency bands,...
In pulse shaping circuits, a transmission line having characteristics of higher impedance, fast transition, low insertion loss is needed. Elevated Coplanar Waveguide (ECPW) has been identified as the transmission line to achieve such characteristics. An equivalent circuit model for ECPW based on the S-Parameter approach is proposed and the RF performance is obtained. The proposed model reveals that...
A single diode mixer with ultra high LO/RF and LO/IF isolation and having good conversion loss has been designed. RF and LO signals are applied through BPF and LPF respectively. The mixer operates in C-band. It down converts the block of frequencies (5.925-6.425 GHz) to a block of frequencies (3.7-4.2 GHz) by local oscillator of signal frequency of 2.3 GHz. The proposed mixer achieves the double balanced...
A pulse power system (1 MV, 5 0kA, and 100 ns) based on dual polarity charged Marx generator and Blumlein pulse forming line (PFL) was built to generate high power microwaves. This paper describes the inherent prepulse present with the Blumlein configuration and the mitigation strategies adopted. Further, a qualitative attempt to verify the generation of high power microwave output on the system is...
A sub harmonically pumped (SHP) diode mixer suitable for direct conversion receiver based on WCDMA standard is presented. In this paper, first we presented a simultaneous signal and noise analysis to analyze a circuit consists of N anti-parallel diode pairs in self-biased structure. Then the results of this CAD routine are confirmed with other method. The mixer is optimized to obtain a maximally flat...
Polyaniline (PANI) thin film on alumina was prepared by the chemical oxidation of aniline with ammonium peroxydisulphate in acidic aqueous medium. DC conductivity, microwave transmission and reflection, shielding effectiveness of the conducting PANI films is reported. The microwave system used for the measurement of transmittance and reflectance was the X-band (8.2 to 12 GHz) waveguide reflectometer.
The present work describes the design and analysis of a four aperture and six aperture coupled multilayered microstrip directional coupler. The single layered four aperture and six aperture directional coupler consist of two microstrip layers one with ground plane. This comparison shows that the coupling of -10 dB was achieved with the four aperture directional coupler but the higher isolation has...
M type barium hexaferrite was prepared by chemical co precipitation method for the Fe/Ba molar ratios of 11:1 and 14:1. Microwave transmittance and reflectance of BaM was studied by overlay on microstrip technique. Microwave permittivity and permeability of BaM was calculated from the shift in resonant frequency of microstrip resonant circuit. The effect of molar ratio on the microwave properties...
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