γ-Rays from pair recombination in a travelling wave structure

1978 ◽  
Vol 21 (7) ◽  
pp. 261-264 ◽  
Author(s):  
M. Bertolotti ◽  
C. Sibilia
Keyword(s):  
Wave Structure ◽  
Travelling Wave ◽  
Γ Rays

Boeing travelling wave structure electrical performance

2003 ◽  
Author(s):  
T. Buller ◽  
W. Gallagher ◽  
R. Friedman ◽  
A. Vetter
Keyword(s):  
Wave Structure ◽  
Travelling Wave ◽  
Electrical Performance

A Review of Slow Wave Structure of Travelling Wave Antenna using Waveguide

2016 ◽  
Vol 3 (1) ◽  
pp. 1-5
Author(s):  
Sakshi Jindal ◽  
◽  
Kritika Khanna ◽  
Brajlata Chauhan ◽  
Rashmi Choudhary ◽  
...  
Keyword(s):  
Slow Wave ◽  
Wave Structure ◽  
Travelling Wave ◽  
Slow Wave Structure ◽  
Wave Antenna

Microstrip Line Fed Leaky Wave Antenna with Shorting Vias for Wideband Systems

2016 ◽  
Vol 6 (4) ◽  
pp. 1725 ◽  
Author(s):  
T V Rama Krishna ◽  
B T P Madhav ◽  
G Monica ◽  
V Janakiram ◽  
S Md Abid Basha
Keyword(s):  
Propagation Constant ◽  
Stop Band ◽  
Wave Structure ◽  
Travelling Wave ◽  
Strip Line ◽  
Defected Ground Structure ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Conducting Path

In this work a complex structured shorted vias microstrip leaky wave antenna is designed and analysed. A Leaky wave antenna is a travelling wave structure with complex propagation constant. When shorting vias are loaded in a periodic structure the fundamental resonant mode shows some stop band characteristics and some of the modes will strongly attenuated. Three different types of iterations are examined in this work with and without defected ground structures. The defected ground structure based leaky wave antennas are showing better performance characteristics with respect to efficiency and phase. A micro strip line feeding with impedance of 50 ohms at both ports are providing excellent impedance matching to the conducting path on the microstrip surface. The shorting vias are suppressing certain higher order frequency bands and providing excellent wide band characteristics with low loss.

scholarly journals Streamwise and doubly-localised periodic orbits in plane Poiseuille flow

2014 ◽  
Vol 761 ◽  
pp. 348-359 ◽  
Author(s):  
Stefan Zammert ◽  
Bruno Eckhardt
Keyword(s):  
Periodic Orbits ◽  
Poiseuille Flow ◽  
Coherent Structures ◽  
Wave Structure ◽  
Edge State ◽  
Travelling Wave ◽  
Spanwise Direction ◽  
Plane Poiseuille Flow ◽  
Streamwise Direction ◽  
Extended States

AbstractWe study localised exact coherent structures in plane Poiseuille flow that are relative periodic orbits. They are obtained from extended states in smaller periodically continued domains, by increasing the length to obtain streamwise localisation and then by increasing the width to achieve spanwise localisation. The states maintain the travelling wave structure of the extended states, which is then modulated by a localised envelope on larger scales. In the streamwise direction, the envelope shows exponential localisation, with different exponents on the upstream and downstream sides. The upstream exponent increases linearly with Reynolds number $\mathit{Re}$, but the downstream exponent is essentially independent of $\mathit{Re}$. In the spanwise direction the decay is compatible with a power-law localisation. As the width increases the localised state undergoes further bifurcations which add additional unstable directions, so that the edge state, the relative attractor on the boundary between the laminar and turbulent motions, in the system becomes chaotic.

scholarly journals Microstrip Line Fed Leaky Wave Antenna with Shorting Vias for Wideband Systems

2016 ◽  
Vol 6 (4) ◽  
pp. 1725
Author(s):  
T V Rama Krishna ◽  
B T P Madhav ◽  
G Monica ◽  
V Janakiram ◽  
S Md Abid Basha
Keyword(s):  
Propagation Constant ◽  
Stop Band ◽  
Wave Structure ◽  
Travelling Wave ◽  
Strip Line ◽  
Defected Ground Structure ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Conducting Path

In this work a complex structured shorted vias microstrip leaky wave antenna is designed and analysed. A Leaky wave antenna is a travelling wave structure with complex propagation constant. When shorting vias are loaded in a periodic structure the fundamental resonant mode shows some stop band characteristics and some of the modes will strongly attenuated. Three different types of iterations are examined in this work with and without defected ground structures. The defected ground structure based leaky wave antennas are showing better performance characteristics with respect to efficiency and phase. A micro strip line feeding with impedance of 50 ohms at both ports are providing excellent impedance matching to the conducting path on the microstrip surface. The shorting vias are suppressing certain higher order frequency bands and providing excellent wide band characteristics with low loss.

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