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The simulation on propagation of microwave beam from one transverse plane to other transverse plane is useful for applications like phase retrieval of microwave beams propagating from one plane to another. The plane wave expansion method is used for paraxial beam propagation of a given field structure. This method decomposes the arbitrary field distribution in to infinite number of plane waves covering...
This paper reports the design methodology of wideband corrugated horn antenna (1.8:1) at C-Band (Tx: 3.7-4. 2 GHz, Rx: 5.9-6.7 GHz). This paper discusses in detail various sections of horn design. i. e. input taper, mode converter, transition section, and output flare. It brings the comparison of analyzed and measured results. The measured return loss is better than 22.9 dB over C-transmit band, better...
This paper describes the techniques for waveguide to suspended stripline transition as well as suspended stripline to waveguide transition. These transitions are used to realize crossbar mixers and band pass filters at 140 GHz. Back to back transitions with input/output waveguide WR-06 have been fabricated to measure insertion loss and return loss of the transition. Transitions have been simulated...
Real and imaginary parts of complex permittivity (epsiv' and epsiv") of soil of Alwar have been determined at a single microwave frequency 9.78 GHz. In view of passive microwave remote sensing horizontal components of emissivity for bare and smooth soil surfaces along with various rough surfaces are determined using the emissivity model. The radar backscattering coefficient of soil surfaces with...
The relative complex dielectric function epsiv*(omega)=epsiv' - jepsiv" of pulverized samples of different grade limestone (cement grade, chemical grade, steel melting soap (SMS) grade and dolomite), coal (lignite) and limestone-coal mixtures (65 wt% + 35 wt%) were measured at 10.1 GHz over a range of bulk densities from loosely to tightly packed. It is found that for these powdered samples,...
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...
Conventional methods of bagasse drying are using natural air convection or using forced air. The use of microwave energy to dry bagasse is not tried so far. It could be advantageous due to possibility of heating and drying bagasse at a much faster rate than conventional methods, thereby controlling calorific value accurately and improving boiler efficiency. Special setup is prepared to carryout experimental...
In this paper the analysis and design of compact CPW-fed slot antenna that operates in the IEEE 802.11a frequency band from 5.15 GHz to 5.35 GHz for wireless applications through a single grounded coplanar waveguide port for achieving sectorized radiation pattern is presented. The antenna is designed on a RT/duroid 5880 substrate with a permittivity 2.22 and with the size of 18.8 mm times 12.3 mm...
The advantages of microwave assisted synthesis over thermal method are enhanced reaction rates, less or no formation of side products short reaction time, higher yields of pure products and reaction can be carried on a preparative scale in open vessels. Thus we introduce here with an efficient, rapid reaction, with atom economy follows an ecofriendly protocol, a concept of ldquoGreen Chemistryrdquo...
This paper presents the basic terminology and concepts of patch antenna along with the description of various feeding techniques. A 2.4 GHz in-plane inset fed microstrip patch antenna has been designed. After describing various feeding techniques, the paper gives a better understanding of the design parameters of an antenna and their effect on bandwidth and efficiency. Finally, simulation is done...
This paper describes the effect of anisotropy on the pulse propagation in microstrip like structures for 0 Lt w/h les 10 anisotropic ratio 0.5 les n les 3 for both low and high permittivity substrates. The anisotropic substrate is transformed into an electrically equivalent isotropic substrate such that the line capacitance in both cases is identical. Using this dispersion model of anisotropy for...
This communication presents an overview of the research work carried out related to microstrip antenna technology and Computational Electromagnetics in the Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi over the last few years. The communication also presents the identified areas of the research in the related field and discusses the various computational,...
In recent past, there has been intense interest for the development of devices around 100 GHz using technologies of solid state devices as well as of vacuum tubes. In the present work we have synthesized serpentine folded waveguide structure based on an analytical approach. Beam parameter 10 kV beam voltage, 50 mA beam current and 200 micron beam diameter have been used for this synthesis. Synthesized...
There is a growing concern about the effect of man-made (anthropogenic) electromagnetic fields on the health of human beings. In particular, the voice has been raised about the possible health effects of fields in the microwave (GHz and shortwave) region. There are various so called epidemiological studies which, in general, lead to very uncertain or ill-defined conclusions. On the other hand, number...
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,...
There is a growing concern about the effect of electric and magnetic fields in the microwave range frequencies on human health. The common microwave oven emits radiation in the frequency region of 2.45 GHz. On the other hand RF radiation (~27 MHz to 1 GHz, microwave diathermy) is beneficially used in physiotherapy for muscular relaxation. There are weapons based on microwave beams and microwaves are...
Electromagnetic fields in the microwave frequency have been used to sort good seeds from the bad ones and the technique makes use of the absorptive component of the dielectric constant of the water molecules material in this frequency region. On the other hand, microwaves are also used for accelerating the culture growth of a bacterial medium. One theory holds that the beneficial effects of microwave...
The CAD oriented closed-form model is presented to compute frequency dependent effective relative permittivity and characteristic impedance of a slot-line with finite conductor thickness in the range 3 mum-50 mum. The model has average accuracy of about 2% against the fullwave results from different sources in the frequency range 2 GHz-60 GHz, 2.22lesepsivrles20, 0.02lesw/hles1.0, 0.01lesh/lambda0...
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