Theoretical study of angular distribution of plane waves in a small reverberation chamber for simulating multipath environment and testing mobile phones

2002 ◽  
Author(s):  
K. Rosengren ◽  
P.-S. Kildal
Keyword(s):  
Angular Distribution ◽  
Mobile Phones ◽  
Theoretical Study ◽  
Plane Waves ◽  
Reverberation Chamber ◽  
Multipath Environment

THEORETICAL STUDY OF STEREODYNAMICS AND ISOTOPIC EFFECTS FOR THE REACTION C(3P) + OD(X2Π) → CO(X1Σ+) + D(2S)

2011 ◽  
Vol 10 (04) ◽  
pp. 447-469 ◽  
Author(s):  
RUNZE LIU ◽  
YIJUE DING ◽  
CHENGYUAN WEN ◽  
JINFENG LI ◽  
MINGWANG ZHONG ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Collision Energy ◽  
Theoretical Study ◽  
Zero Point ◽  
Point Energy ◽  
Mass Factor ◽  
Generalized Differential ◽  
Paper Product ◽  
Isotopic Effects

Theoretical study on stereodynamics for the title reaction as well as its isotopic effects has been studied via QCT calculations on the ground X2A′ state of ab initio potential energy surface according to the study by Zanchet et al. Four polarization-dependent generalized differential cross-sections PDDCSs ((2π/σ) (dσ00/dωt), (2π/σ)(dσ20/dωt)), (2π/σ)(dσ22+/dωt), (2π/σ)(dσ21-/dωt), and the distributions of P(θr) and P(φr) that denotes the correlations of k-j′ and k-k′-j′ are presented in this work. Product angular distribution and rotational polarization have been analyzed at different collision energies and compared with C+OH reaction. Product angular distribution shows strong forward scattering at low collision energy and becomes more symmetric with forward and backward scattering with the increasing collision energy. The alignment and orientation of product angular momentum presents a different behavior with collision energy, the former one increases monotonically with collision energy, whereas the latter one shows first decreasing and then increasing behavior, which have been analyzed in the present paper. Product rotational polarization for C+OD is weaker than that for C+OH , which is mainly due to the mass factor and zero point energy of C+OD .

Angular distribution of the Ne autoionization resonances: experimental and theoretical study

1997 ◽  
Vol 30 (3) ◽  
pp. 593-607 ◽  
Author(s):  
B Langer ◽  
N Berrah ◽  
R Wehlitz ◽  
T W Gorczyca ◽  
J Bozek ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Theoretical Study

X-ray intensity patterns from finite perfect crystals

1999 ◽  
Vol 55 (6) ◽  
pp. 1000-1013
Author(s):  
Gunnar Thorkildsen ◽  
Helge B. Larsen
Keyword(s):  
Theoretical Study ◽  
Plane Waves ◽  
X Ray ◽  
Characteristic Lines ◽  
Different Types ◽  
Infinite Crystal ◽  
Lateral Crystal ◽  
Slit System ◽  
Green Technique ◽  
The Waves

A theoretical study dealing with intensity interference patterns from the exit surfaces of finite perfect t\times l crystals has been undertaken using the Takagi–Taupin equations and the Riemann–Green technique. Numerical simulations have been performed for the 220 reflection in diamond allowing for different types of amplitude-modulated incoming plane waves. The effects caused by limiting the waves by a slit system are also discussed. The results show strong influence of the lateral crystal boundaries and are closely related to the geometrical region structures formed by the characteristic lines associated with the equations. In the limit of a semi-infinite crystal, the Borrmann–Lehmann interference patterns are retrieved.

scholarly journals Correlation and Capacity Calculations with Reference Antennas in an Isotropic Environment

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Thorkild B. Hansen
Keyword(s):  
Plane Wave ◽  
Plane Waves ◽  
Sampling Rate ◽  
Base Station ◽  
Mimo Channel ◽  
Reverberation Chamber ◽  
Capacity Curves ◽  
Standard Base ◽  
Chamber Model ◽  
Antenna Correlation

A reverberation chamber is a convenient tool for over-the-air testing of MIMO devices in isotropic environments. Isotropy is typically achieved in the chamber through the use of a mode stirrer and a turntable on which the device under test (DUT) rides. The quality of the isotropic environment depends on the number of plane waves produced by the chamber and on their spatial distribution. This paper investigates how the required sampling rate for the DUT pattern is related to the plane-wave density threshold in the isotropic environment required to accurately compute antenna correlations. Once the plane-wave density is above the threshold, the antenna correlation obtained through isotropic experiments agrees with the antenna correlation obtained from the classical definition, as has been proven theoretically. This fact is verified for the good, nominal, and bad reference antennas produced by CTIA. MIMO channel capacity simulations are performed with a standard base station model and the DUT placed in a single-tap plane-wave reverberation chamber model. The capacity curves obtained with the good, nominal, and bad reference antennas are clearly distinguishable.

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