A5054071021- Antenna Design and Optimization
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Satellite Communication Systems
- Radio Astronomy Observations and Technology
- Electromagnetic Compatibility and Measurements
- Nursing Roles and Practices
- Superconducting and THz Device Technology
- Structural Analysis and Optimization
- Spacecraft Design and Technology
- Full-Duplex Wireless Communications
- GNSS positioning and interference
- Modular Robots and Swarm Intelligence
- Energy Harvesting in Wireless Networks
- Advanced Control and Stabilization in Aerospace Systems
- Superconducting Materials and Applications
- Biomedical and Engineering Education
- Advanced MIMO Systems Optimization
- Wireless Body Area Networks
- Radio Frequency Integrated Circuit Design
- Millimeter-Wave Propagation and Modeling
- Terahertz technology and applications
- Wireless Communication Networks Research
- Parallel Computing and Optimization Techniques
University of Illinois Chicago
2017-2022
Northrop Grumman (United States)
2010-2022
National Technical University of Athens
2022
University of Calcutta
2020
Third World Newsreel
2020
Chapter Arts Centre
2020
University of Genoa
2019
Institute of Electrical and Electronics Engineers
2018
Gorgias Press (United States)
2018
University of Arizona
2013
Wireless body-centric sensing systems have an important role in the fields of biomedicine, personal healthcare, safety, and security. Body-centric radio-frequency identification (RFID) technology provides a wireless maintenance-free communication link between human body surroundings through wearable implanted antennas. This enables real-time monitoring vital signs everywhere. Seamlessly integrated miniaturized antennas thus potential to revolutionize everyday life people, contribute...
A review of various antenna technologies suitable for satellite communications and applicable to fixed satellite, broadcast mobile communications, personal services is presented. Antenna generating contoured beam multiple-beam antennas are reviewed. Design considerations reflector feed assemblies performance in terms coverage gain, sidelobe isolation, cross-polar isolation discussed. Current future technological trends presented the above areas.
This paper presents the parametric design and analysis of multiple-beam reflector-antenna systems employed for satellite communications. It is based on extending earlier work Rao (see IEEE Antennas Propagation Magazine, vol.41, no.4, p.53-59,1999) by taking into account efficiency horn pointing error in antennas (MBAs), analyzing edge-of-coverage directivity co-polar isolation (C/I) performance. Design equations are developed using offset parabolic-reflector including various parameters such...
Design aspects of high efficiency profiled circular horns with thin walls as feeds for multibeam reflector antennas satellite applications are presented in this paper. The modal content at the aperture horn necessary to closely approximate a unipolarized uniform distribution is first established. Slope discontinuities along length then used generate modes appropriate amplitudes and phases. performance calculated using mode matching technique. Significant improvement reduction cross-polar...
Simplified design and analysis equations are presented for multiple-beam reflector antennas based on the Gaussian-beam of primary secondary patterns. The derived useful quick performance in terms coverage-area directivity inter-beam isolation antenna systems. Results given this paper agree well with rigorous computations physical-optics reflector-antenna radiation Extension to lens antennas, shaped/contoured-beam is also presented.
A novel stepped-reflector antenna (SRA) suitable for dual-band multiple beam satellite payloads is introduced in this paper. The SRA system produces "flat-top" radiation patterns receive beams and highly efficient Gaussian transmit over a geographic coverage region as seen by the geo-synchronous satellite. It combines reflector improvements through use of with feed horn advancements "high-efficiency horns" order to realize an (MBA) supporting both downlink uplink signals communication...
This article presents a design of an origami reconfigurable circularly polarized quadrifilar helical antenna (QHA) with foldable reflector that can operate in K, Ka, and extremely high-frequency (EHF) bands. A 10:1 scale prototype the proposed is built validated through measurements simulations.
The design of a rectangular lattice with identical row and column boards Rotman lenses to feed hexagonal array radiating elements is described in this paper. resultant beams high directivity good isolation are arranged that rotated 90/spl deg/ from the element lattice. A prototype network was built excite conical horns. measured patterns planar as well characteristics individual agree very predictions.
Phased array (PA) and reflector antennas are widely used in spacecraft, aircraft, ground communications applications. This article provides design equations guidelines that engineering professsionals can use for the quick reasonably accurate of these without resorting to time-consuming simulations. It also insight into various parameters their impact on radio-frequency (RF) performance antenna designs.
The ionosphere, a major source of GPS pseudorange errors, can now be used to monitor and control other errors in two-frequency systems. These which may originate the receiver, pre-amp, satellite, or elsewhere, have been continuing correction issue for precise measurement. Ionosphere-based is possible through use self-calibration (SCORE) algorithms, apply consistency constraints on ionospheric measurements calibrate an installed receiver system non-ionospheric error. SCORE delivers sum, each...
A multiband antenna system supporting multiple communication services and beams is presented. Key component of the smooth-walled horn that has efficient radiation patterns over three frequency bands are spread an octave bandwidth provides optimal illumination on reflector at all bands. Results feed discussed.
This paper presents a novel antenna system that employs "non- focused reflector" (NFR) to reconfigure the beams of communications payloads HIEO (highly inclined elliptical orbit) and GEO (geo-stationary) satellites. The key advantages NFR are it minimizes number feed array elements for given coverage, has better scan performance, reduced complexity. Design examples both HlEO satellites shown indicating fully reconfigurable on-orbit using with small active feed.
Design of a novel aircraft antenna for Ku-band communications with other and ground terminals is presented in this paper. In particular, compact full-duplex multi-beam phased array wide scan capability (serving multiple users simultaneously) discussed. Generic parametric curves design such antennas are also presented. Performance the characterized as function challenges achieving
This paper presents a dual-band antenna system that is suitable for satellite communications at K/Ka-band frequencies. It employs minimum number of reflectors, each being fed with multiple feed horns. shown the MBA performance in terms coverage gain and co-polar isolation can be significantly improved by using optimal designs horn reflector. The results this are compared conventional trade-offs discussed.
This paper presents an advanced dual-band antenna system suitable for broadband satellites that is capable of providing higher EIRP, G/T, and improved copolar isolation among frequency reuse beams. The employs a hybrid-cell scheme instead conventional fixed cell (4-cell or 7-cell) in order to efficiently use spectrum based on traffic demands. It shown the employing high-efficiency horns shaped reflectors provide about 1.0 dB EIRP improvement, 2.0 G/T 3.0 improvement C/I when compared antennas.
Car radios were introduced for commercial (broadcast) and professional (communications) purposes in the 1920s [1]. This novelty was just one of many innovative technologies products that taken into mass production passenger cars, vehicles general, since then [2, 3]. Wireless communications particular nowadays represent an important business area automotive market, "infotainment" (information entertainment), comfort, environ mental, safety-related services. In field connectivity -...
On-orbit beam reconfiguration and scanning are the two most important features for future satellite antenna payloads. There several ways of achieving desired flexibility using different types antennas methods. This article presents single- dual-reflector systems where is achieved high-gain multiple beams (HGMBs) employing imaging reflector configurations. Beam over global coverage a combination precise electronic small region coarse mechanical wide coverage. method results in significant...