A5101933464- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Radio Astronomy Observations and Technology
- Antenna Design and Analysis
- Superconducting and THz Device Technology
- Advanced Antenna and Metasurface Technologies
- Wireless Body Area Networks
- Microwave Imaging and Scattering Analysis
- Physics of Superconductivity and Magnetism
- Ultrasound and Hyperthermia Applications
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Microfluidic and Bio-sensing Technologies
- Particle Detector Development and Performance
- Thermochemical Biomass Conversion Processes
- Lignin and Wood Chemistry
- Electromagnetic Compatibility and Measurements
- Satellite Communication Systems
- Metallurgical Processes and Thermodynamics
- Electric Motor Design and Analysis
- Astrophysics and Cosmic Phenomena
- Magnetic Properties of Alloys
Indian Space Research Organisation
2008-2024
Brookhaven National Laboratory
1992-2014
Brookhaven College
2002
University of Rajasthan
1996
Banaras Hindu University
1994
Associated Universities, Inc.
1992
A new type of antenna named as compound box-horn is designed and analyzed for its radiation pattern.The present analysis based on plane wave spectra three-dimensional fields.The obtained by combining modified pyramidal horn antennas, in which coupled to excite TE 10 -and 30modes at the input horn.Thus, boxhorn has properties advantages both antennas.The patterns corresponding half-power beam widths (HPBWs) free-space are computed GHz compared different flare angles E-and H-planes larger size...
This letter is concerned with the design and analysis of a dual-polarized center-fed-shaped reflector antenna presently implemented for satellite communication. Design challenges such an have been outlined herein. A novel hybrid surface shaping technique devised that employs both global local profile variables using blend Zernike polynomials (for globalized shaping) spline functions localized shaping). TICRA POS software, physical optics (PO)-based optimizer, employed synthesis. approach...
Muon Colliders have unique technical and physics advantages disadvantages when compared with both hadron electron machines. They should thus be regarded as complementary. Parameters are given of 4 TeV 0.5 high luminosity \mu^+ \mu^- colliders, a lower demonstration machine. We discuss the various systems in such muon starting from proton accelerator needed to generate muons proceeding through cooling, acceleration storage collider ring. Detector background, polarization, nonstandard...
In present paper, a novel and effective hyperthermia applicator utilizing an elliptically bent conformal array of longitudinal slots in narrow wall rectangular waveguide is analyzed by two different approaches, viz., the vector potential method Fresnel- Kirchhoff scalar diffraction field theory. The agreement between theories reasonably very good. This configuration mainly intended as specialized for treatment tumor within curved portions human body such abdomen, neck, chest etc. Each slot...
This letter is concerned with design and development of a new dual-band multimode profiled smooth-walled horn (DBPH) at Ku-band (uplink downlink frequency bands). The analyzed optimized using mode-matching-technique-based software (Mician ¿ Wave wizard). Predicted radiation patterns properties the DBPH are compared to corresponding measured results showing good agreement. Relatively higher edge coverage (EOC) gain low cross-polar level EOC achieved by synthesizing order modes TE <sub...
The properties of the neutrino provide a unique window on physics beyond that described by standard model. study subleading effects in oscillations, and race to discover CP-invariance violation lepton sector, has begun with recent discovery ${\ensuremath{\theta}}_{13}>0$. measured value ${\ensuremath{\theta}}_{13}$ is large, emphasizing need for facility at which systematic uncertainties can be reduced percent level. factory, intense beams are produced from decay muons, been shown outperform...
This paper reports design and development of an innovative compact Stepped Truncated-Circular Waveguide Branching Ortho-Mode Transducer (STCWB-OMT) operating at 4.5{4.8GHz for horizontal vertical polarizations. STCWB-OMT is derived by introducing branch waveguide via coupling slot on a stepped truncated- circular waveguide. conflguration possesses inbuilt rectangular- to-circular transition; therefore it does not require any additional square-to-circular transition to combine with horn...
This article reports on the design and development of a novel sharedaperture antenna that is set at widely separated L5 S bands for navigation satellite systems with its concentric phase centers located two bands. The radiating element performance also detailed as well critical sections, namely, square-coaxialline waveguide feed networks, in view multipaction average power handling capability. An innovative method implementing sequential rotation scheme improving array cross-polarization...
Abstract This article presents theoretical and/or experimental study of the propagation and radiation characteristics dielectric‐loaded axial‐mode helical antenna at 8.985 10.0 GHz. Characteristic equations for sheath helix model are derived three different dielectric loadings viz. loading with two coaxial layers, single layer, air. These solved constant hence phase velocity n = 1 higher order spatial harmonic mode. The variation in wavelength normalized circumference is studied ratio outer...
This article outlines impact of various factors on cross-polarization characteristics offset reflector antenna for communication spacecraft with smaller sized bus at C band. Effects different parameters are considered in rigorous analysis the antenna. Measured and predicted performances found agreement. To fulfill specific requirement higher edge-of-coverage gain (>26 dBi) discrimination (XPD > 30 dB) over a wider coverage dual linear polarization under imposed constraints, novel...
This paper reports a new compact dual-band axially corrugated profiled horn feed (DBCPH) for prime-focus reflector antenna at C-band (uplink and downlink frequency bands with bandwidth ratio of 1.6). DBPCH consists one sinusoid section two internal axial corrugations (internal short-circuited ring slots), obtaining multimode feed. Such blended structure is optimized over the specified (3.68–3.70 5.865–5.915 GHz) to achieve various performance objectives (such as compactness, return loss,...
This paper discusses the advanced Space Based Network (SBN) built by Boeing for LightSquared, Virginia, USA. The first SBN has been accepted LightSquared in early 2011, and is getting ready to begin 4G broadband network services mobile applications North America. hybrid several elements; like, patented Ancillary Terrestrial Component (ATC) technology, geo-mobile satellite with 22m L-band reflector an on-board channelizer, feederlink gateways Ground Beam Former (GBBF) that interfaces...
A novel compact dual-profiled corrugated hybrid horn antenna (DPCHHA) feed for a shaped reflector is presented in this abstract. Presently employed at Ku-band (10.95–11.7 GHz), the DPCHHA consists of four sections, viz. stepped section throat, axial followed by radial sections aperture side. The optimised using software TICRA CHAMP and fabricated aluminium alloy 6061T6. measured results agree well with predicted one. has demonstrated return loss>20 dB, cross-polarisation (<−40 dB) adequate...
This paper reports a most complex shaping of dual gridded reflector (DGR) antenna for stringent requirement. There is requirement service area (India with islands) and 10 spatial isolation zones. RF requirements awake severe design complexity challenges, which addressed here. A physical optics-based optimiser employed the surface synthesis. The cross-pol degradation due to nearby identified counter-balanced. Scattering component between two shells reduced sufficiently lessen impact...
The growing interest in higher capacity communications satellite necessitates the development of compact and lightweight other antennas (such as beacon horn antenna) at Earth-viewing deck due to crowded accommodation weight limitation. In this article, we describe an innovative high-gain composite antenna for space-borne application. We have designed, manufactured measured operating from 10.7 GHz 12.5 GHz. is devised by combining stepped section input, axial corrugated mid finally radial...