In this paper, a printed hexagonal wide slot antenna, fed by a microstrip line with fork like tuning stub for bandwidth enhancement is proposed and experimentally investigated. The impedance, radiation and gain characteristics of this antenna are studied. Simulation and experimental results indicate that a 1.5:1 VSWR bandwidth, of about 1 GHz and 2:1 VSWR bandwidth of 1.34 GHz is achieved at op...

This paper presents a printed dual band monopole antenna working below 250 MHz using meander line and an added stub. Meander approach is used to reduce the size of low frequency monopole. The proposed fed by microstrip on FR-4 substrate with overall 290 x 83 mm 2 . stub tuned operation at 114 221 measured reflection coefficient -19 dB both bands. has omni-directional characteristics efficiency ...

[1] A study of the retrieval of sea surface roughness using Global Navigation Satellite System-Reflectometry (GNSSR) from satellite is presented. Delay-Doppler Maps (DDMs) from the SSTL UK-DMC satellite are analyzed to retrieve directional Mean Square Slopes (MSSs). Results are compared to theoretically-derived MSSs and in situ measurements from co-located buoys of the National Data Buoy Center...

In this paper LVCMOS, HSLVDCI, HSTL, LVDCI_DV2 and SSTL Input/output standard is used for the design of Green Fibonacci generator on 40nm FGPA to generate key for Wi-Fi Protected Access in order to make energy efficient communication. In naming convention of I/O standard, LV is low voltage, HS is high speed, DV2 is half impedance, CMOS is Complementary metal Oxide Semiconductor, DCI is digitall...

A novel wide band matching circuit for the series fed patch array antenna at 80 GHz is proposed in this paper. The designed with amplitude tapered configuration. First, matched using stub loaded transmission line (TL) narrow band. Later, it converted to three quarter wave transformers and two half wavelength stubs. sizes of these stubs are reduced step impedance TLs. simulated results without c...

AlSat-1, the First Algerian National Satellite, and the first of five microsatellites in the Disaster Monitoring Constellation (DMC), was launched on the 28 November 2002 from Plesetsk. AlSat-1 was joined by SSTL built Microsatellites for Nigeria, the United Kingdom and Turkey with the second DMC launch on the 23 September 2003 and the fifth microsatellite for China was launched into the same o...

We introduce Partial Signatures, where a signer, given a message, can compute a “stub” whichpreserves her anonymity, yet later she, but nobody else, can complete the stub to a full and verifiablesignature under her public key. We provide a formal definition requiring three properties, namelyanonymity, unambiguity and unforgeability. We provide schemes meeting our definition both...

The electron flow through quantum waveguides is modeled by the time-dependent Schrödinger equation with absorbing boundary conditions, which are realized by a negative imaginary potential. The Schrödinger equation is discretized by a time-splitting spectral method, and the quantum waveguides are fed by a mono-energetic incoming plane wave pulse. The resulting algorithm is extremely efficient du...

In this paper, firstly the time-constant of an integrator is described in continuous as well as in the discrete-time domains. Further, a simple relation is expressed to find the time-constant of an integrator from continuous-time domain to discrete-time domain or vice-versa. Thereafter, the microwave integrators of different time-constants are obtained by optimizing the characteristic impedance...