Elliptical beam closed-form dual-reflector antenna efficiently illuminated by a feed with an axially-symmetric radiation pattern

2002 ◽  
Author(s):  
K.W. Brown ◽  
A. Prata
Keyword(s):  
Closed Form ◽  
Radiation Pattern ◽  
Reflector Antenna ◽  
Axially Symmetric ◽  
Dual Reflector Antenna

scholarly journals Omnidirectional Dual-Reflector Antenna with GO Shaped Main Reflector for Pattern Control in the Elevation Plane: OADC Case

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
José R. Bergmann ◽  
Fernando J. S. Moreira
Keyword(s):  
Radiation Pattern ◽  
Method Of Moments ◽  
Vertical Plane ◽  
Accurate Method ◽  
Reflector Antenna ◽  
Far Field ◽  
Pattern Control ◽  
Field Radiation ◽  
Main Reflector ◽  
Dual Reflector Antenna

This paper presents a formulation for shaping the main reflector of an axis-symmetric dual-reflector antenna designed to offer an omnidirectional coverage with an arbitrary radiation pattern in the vertical plane. The subreflector is generated by an axis-displaced conic, and the main reflector is shaped to achieve a prescribed far-field radiation pattern. The procedure is based on geometrical optics (GO) principles. Two distinct far-field ray structures are explored and their limitations are identified. The GO shaping results are validated by analysis provided by the accurate method of moments technique.

Near-Tip Fields for Penny-Shaped Cracks in Magnetoelectroelastic Media

2006 ◽  
Vol 312 ◽  
pp. 41-46 ◽  
Author(s):  
Bao Lin Wang ◽  
Yiu Wing Mai
Keyword(s):  
Closed Form ◽  
Transversely Isotropic ◽  
Crack Plane ◽  
Axially Symmetric ◽  
Crack Configuration ◽  
Penny Shaped Crack ◽  
Electric And Magnetic Fields ◽  
Shaped Crack ◽  
Transversely Isotropic Solids ◽  
Isotropic Solids

This paper solves the penny-shaped crack configuration in transversely isotropic solids with coupled magneto-electro-elastic properties. The crack plane is coincident with the plane of symmetry such that the resulting elastic, electric and magnetic fields are axially symmetric. The mechanical, electrical and magnetical loads are considered separately. Closed-form expressions for the stresses, electric displacements, and magnetic inductions near the crack frontier are given.

Offset spherical dual-reflector antenna

1983 ◽  
Vol 19 (22) ◽  
pp. 912 ◽  
Author(s):  
R.C. Brown ◽  
P.J.B. Clarricoats ◽  
P. Ramanujam
Keyword(s):  
Reflector Antenna ◽  
Dual Reflector Antenna
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