We confront a very wide body of HERA diffractive electroproduction data with the predictions of the colour dipole model. We focus upon three different parameterisations of the dipole scattering cross-section and find good agreement for all observables. There can be no doubting the success of the dipole scattering approach and more precise observations are needed in order to expose its limitations.

The small P wave compoment of B → J/ψK * measured by CLEO makes it practical to measure sin 2β using B 0 → J/ψK * 0 → J/ψK S π 0 , independent from B 0 → J/ψK S. Because these modes are color suppressed, new physics enhanced color dipole bsg coupling, as hinted from the persistent B s.l. and n C problems as well as the newly observed large semi-inclusive B → η ′ + X s decay, may have significan...

The design of a 400 M H z directional antenna for a space vehicle is presented. The design utilizes the spacecraft itself as an integral part of the antenna. The antenna has a gain of 4 dB over a dipole, a front to back ratio of 8 dB, and a -6 dB beam angle of 34“. Design equations and experimental data are presented.

In this note we consider some of radiating dipole antenna as related to content of the radiated waveform. For the design-parameters for a pulsethe high-frequency and low-frequency the high-frequency portion the use of a biconfcal wave launcher is discussed, The low-frequency content depends on such parameters as generator voltage and capacitance and the capacitance and mean charge separation di...

Abstract. In order to reduce the size of a wireless system, we have proposed the design formulas for an electrically small antenna (ESA), i.e. an antenna whose dimension is much smaller than a wavelength, with a miniaturized matching circuit which connects to a 50ohm external circuit. We designed a slot dipole antenna with the aid of the simulations using the electrical circuits as well as the ...

A novel uniplanar slot dipole antenna fed by a coplanar waveguide (CPW) is proposed for dual-band operation. The frequency ratio between the first spurious and fundamental modes of the slot dipole antenna can be conveniently adjusted with the use of four slot stubs introduced on its two arms. Furthermore, the radiation patterns at the first spurious mode are modified by adding four parasitic sl...

This paper reports a new method for reducing the Radar Cross-Section (RCS) of a metal backed dipole antenna. Numerical simulations are used to show that when the Perfect Electrical Conductor (PEC) is replaced by a carefully designed Frequency Selective Surface (FSS), the electromagnetic performance of the antenna is similar in band, but the RCS of the structure is significantly lower out of ban...

In the present paper, design and analysis of a 2.4 GHz printed dipole antenna for wireless communication applications are presented. Measurements on return loss and radiation pattern of this antenna configuration are included in this investigation. The printed dipole is combined with the feeding structure of a microstrip via-hole balun and is fabricated on an FR-4 printed-circuit-board substrat...

This paper presents the design procedure of a printed dipole antenna and 1D array configurations of the single dipole element in the Ku-Band with its metallic reflector plane parallel to the array plane. The proposed antenna has a natural beam tilt which is useful for some specific applications. Several array configurations in 1D are simulated and tested. The effect of mutual coupling among eac...