In this paper, a theoretical model based on the electric field integration method is proposed to analyse radiation properties of slotted annular Leaky-Wave Antenna (LWA), which can generate Circularly Polarized (CP) conical beam or broadside beam. The LWA contains radiating elements arranged along circular travelling-wave structure with equal intervals. By combining and theory, design procedure...

Cascade conical refraction occurs when a beam of light travels through two or more biaxial crystals arranged in series. The output beam can be altered by varying the relative azimuthal orientation of the two biaxial crystals. For two identical crystals, in general the output beam comprises a ring beam with a spot at its centre. The relative intensities of the spot and ring can be controlled by ...

A beam-changeable concentric annular Leaky-Wave Antenna (LWA) array is proposed, which contains two LWAs with constant-interval slots. By changing the excitations of LWAs, radiation beam can be changed to different shapes and in directions i.e. single normal direction, conical 40° a synthetic beam. theoretical model for analyzing properties LWA put forward, prototype radius 42.6 mm heigh...

a finite element analysis is presented for sloshing and impulsive motion of liquid-filled conical tanks during lateral anti-symmetric excitation. the performed analyses led to the development of a number of charts which can be used to identify the natural frequency, the mode shapes of conical tanks for both fundamental and the cos(θ)-modes of vibration. conical tank geometry was described with ...

The reflection of light is governed by the laws first described by Augustin-Jean Fresnel: on internal reflection, light acquires a phase shift, which depends on its polarization direction with respect to the plane of incidence. For a conical reflector, the cylindrical symmetry is echoed in an angular variation of this phase shift, allowing us to create light modes with phase and polarization si...

A new single-pulse behaviour has been identified in two pulsars, B0919+06 and B1859+07. Normally both stars emit bright subpulses in a region near the trailing edge of their profile. However, occasionally these stars exhibit “events” wherein the emission longitude gradually decreases, by about their profile width, remains in this position for typically several tens of pulses, and then gradually...