Rigorous computation of a compact square patch antenna with notches using the moment method

2018 ◽  
Vol 18 (1) ◽  
pp. 197-204
Author(s):  
Amel Boufrioua
Keyword(s):  
Patch Antenna ◽  
Moment Method ◽  
Rigorous Computation ◽  
The Moment

scholarly journals TRAPEZOIDAL CURVES IN WIDEBAND PATCH ANTENNA DESIGN

2021 ◽  
Vol 7 (3) ◽  
pp. 17-21
Author(s):  
H. Gaha ◽  
◽  
F. Choubani ◽  
A. Bouallegue ◽  
◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Patch Antenna ◽  
Moment Method ◽  
Antenna Design ◽  
Wideband Antennas ◽  
Trapezoidal Shape ◽  
Electric And Magnetic Fields ◽  
Electromagnetic Characteristics ◽  
The Moment

This paper opens investigations on patch antenna and simple and deformed trapezoidal shape invariants. The simplest and the most compact the antenna is, the most efficient it is and the less it costs. When we aim for a wideband communication, we should design our antennas while taking into account many essential electromagnetic characteristics. This paper studies different patch antenna shapes based on trapezoids. Curves are explored to modify these shapes and to ameliorate the quality of wideband antennas. The moment method is used here as a technique of analyzing (MOM) electric and magnetic fields. Actually, novel invariants in the explored shapes, were underlined in this paper and orient the antenna designer to take care of their dimensions as well as these variables affects closely the bandwidth offered consequently by the designed antenna.

scholarly journals Spectral gap in random bipartite biregular graphs and applications

2021 ◽  
pp. 1-39
Author(s):  
Gerandy Brito ◽  
Ioana Dumitriu ◽  
Kameron Decker Harris
Keyword(s):  
Community Detection ◽  
Adjacency Matrix ◽  
Moment Method ◽  
Coding Theory ◽  
High Probability ◽  
Spectral Gap ◽  
Matrix Completion ◽  
Full Rank ◽  
The Moment ◽  
Deterministic Matrix

Abstract We prove an analogue of Alon’s spectral gap conjecture for random bipartite, biregular graphs. We use the Ihara–Bass formula to connect the non-backtracking spectrum to that of the adjacency matrix, employing the moment method to show there exists a spectral gap for the non-backtracking matrix. A by-product of our main theorem is that random rectangular zero-one matrices with fixed row and column sums are full rank with high probability. Finally, we illustrate applications to community detection, coding theory, and deterministic matrix completion.

Investigation of the Thermodynamic Properties of Anharmonic Crystals with Defects and Influence of Anharmonicity in Exafs by the Moment Method

1998 ◽  
Vol 12 (02) ◽  
pp. 191-205 ◽  
Author(s):  
Vu Van Hung ◽  
Nguyen Thanh Hai
Keyword(s):  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Phase Change ◽  
Specific Heat ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Moment Method ◽  
Adiabatic Compressibility ◽  
Relative Displacement ◽  
The Moment

By the moment method established previously on the basis of the statistical mechanics, the thermodynamic properties of a strongly anharmonic face-centered and body-centered cubic crystal with point defect are considered. The thermal expansion coefficient, the specific heat Cv and Cp, the isothermal and adiabatic compressibility, etc. are calculated. Our calculated results of the thermal expansion coefficient, the specific heat Cv and Cp… of W, Nb, Au and Ag metals at various temperatures agrees well with the measured values. The anharmonic effects in extended X-ray absorption fine structure (EXAFS) in the single-shell model are considered. We have obtained a new formula for anharmonic contribution to the mean square relative displacement. The anharmonicity is proportional to the temperature and enters the phase change of EXAFS. Our calculated results of Debye–Waller factor and phase change in EXAFS of Cu at various temperatures agrees well with the measured values.

scholarly journals The Slowly Pulsating B Star HD 147394

2002 ◽  
Vol 185 ◽  
pp. 234-235
Author(s):  
M. Briquet ◽  
A. Noels ◽  
C. Aerts ◽  
P. Mathias
Keyword(s):  
Moment Method ◽  
Mode Identification ◽  
The Moment

AbstractHD 147394 is a Slowly Pulsating B star for which we found three periods in the moments of the Si II 4128-4130 lines: f1 = 0.8008 c/d, f2 = 0.7813 c/d and f3 = 0.6710 c/d. A mode identification is perform ed by using the moment method.

Numerical instabilities of the moment method in waveguide calculations

1977 ◽  
Vol 13 (23) ◽  
pp. 694
Author(s):  
F.E. Gardiol ◽  
P. Haldemann
Keyword(s):  
Moment Method ◽  
Numerical Instabilities ◽  
The Moment
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