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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.
In this paper, electromagnetic bomb is discussed with main emphasis on maximizing the lethality of the bomb by suitably designing the antenna, which can couple the high power microwaves to the targets, efficiently. Some other methods for maximizing the lethality are also discussed.
We introduce here a Multimode Interference (MMI) based 2times2 switch that has substantially smaller device geometry than conventional Multimode Interference (MMI) structures. This multimode structure is based on special multimode region shape and refractive index. Further we used it in to design of 4times4 optical switch based on banyan architecture. This 4times4 optical switch features small size,...
This paper deals with design and development of waveguide type dual directional coupler for S-band linear accelerator at spot frequency 2.998 GHz with VSWR, coupling factor, and return loss of f 1.1, 60 dB, and 20 dB, respectively. The HFSS software is used for computation of diameter of holes and positions. Based on design, all parts of coupler are fabricated and finally the coupler is developed...
Mutual coupling is an important factor for the study of multiple-input multiple-output antenna system. A study of the effect of mutual coupling between the antenna elements of MIMO system has been performed. We focus on the userpsilas spectral efficiency and data throughput where coupling environment is present. A key contribution of this paper is a simple MIMO structure that offers higher spectral...
Directional couplers are used to monitor forward and reflected high RF powers. At Mega Hertz range of frequencies, normally loop type directional couplers are used. The loop samples electric or magnetic fields. The penetration and orientation of the loops are adjusted in such a way that the magnitude of electric and magnetic current is same in the two arms of the loop. In this configuration one arm...
In this paper a computationally efficient Method of Moments (MoM) formulation for the analysis and evaluation of resonance characteristics of transverse wall round end slot coupled junction between two similar waveguides is presented. The junction has been analyzed for the three types of slots, namely the basic rectangular slot, rectangular slot with semicircular ends and rectangular slot with slightly...
Gyrotron is a high power microwave device intensively developed for heating of plasma in thermonuclear fusion research. The relativistic gyrating electron beam interacts with transverse electric (TE) wave near cutoff in a uniform section of tapered cavity resonator at a DC magnetic field helps to excite several modes simultaneously. The efficient operation of the gyrotron requires excitation of desired...
A rectangular patch coupler has been designed and developed using electromagnetic band gap on the ground plane of the microstrip configuration. This coupler suppresses the higher order harmonics, especially the third harmonic. The simulated response of the coupler has been verified experimentally.
Coupled transmission lines in inhomogeneous media essentially offer wide bandwidth, tight coupling (3 dB) and low attenuation. This type of structure is very useful for microwave & millimeterwave integrated circuits using planar circuit technologies like Mixers, Oscillators, Multipliers, Filters and Couplers etc. Here a computational method, based on quasi-static spectral domain technique, has...
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...
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