Radiation Characteristics of an Electric Dipole of Arbitrary Orientation Placed Above a Plane Screen

2003 ◽  
Vol 60 (3-4) ◽  
pp. 30-47 ◽  
Author(s):  
N. N. Gorobets ◽  
N.P. Yeliseyeva
Keyword(s):  
Electric Dipole ◽  
Arbitrary Orientation ◽  
Radiation Characteristics

RADIATION FROM AN ELECTRIC DIPOLE IN AN AXIALLY MAGNETIZED PLASMA COLUMN—DIPOLAR MODES

1967 ◽  
Vol 45 (11) ◽  
pp. 3627-3648 ◽  
Author(s):  
G. L. Yip ◽  
S. R. Seshadri
Keyword(s):  
Electric Dipole ◽  
Radiation Resistance ◽  
Guided Waves ◽  
Plasma Frequency ◽  
Axial Magnetic Field ◽  
Radiation Power ◽  
Magnetized Plasma ◽  
Signal Frequency ◽  
Radiation Characteristics ◽  
Power Pattern

The radiation characteristics of an electric dipole are investigated for the case in which it is situated on, and oriented perpendicular to, the axis of an infinitely long and axially magnetized column of uniform, lossless, and cold plasma. In general, the electric dipole will excite space waves as well as guided waves, both of which are dipolar in nature. The radiation power pattern and the radiation resistance, resulting from the space waves, are investigated as a function of the column radius, the signal frequency, and the strength of magnetization. For thin and isotropic plasma columns, the radiation resistance has a maximum, which is due to the dipolar resonance. This resonance occurs at 1/√2 times the plasma frequency. The introduction of anisotropy by the application of an axial magnetic field results in the splitting of the single dipolar resonance into two, occurring at frequencies below and above 1/√2 times the plasma frequency. Finally, a comparison is made between the radiation characteristics in the present problem and those due to an axially oriented dipole.

scholarly journals Fence Shaping of Substrate Integrated Fan-Beam Electric Dipole for High-Band 5G

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 545 ◽  
Author(s):  
Waleed El-Halwagy ◽  
Rashid Mirzavand ◽  
Jordan Melzer ◽  
Masum Hossain ◽  
Pedram Mousavi
Keyword(s):  
Electric Dipole ◽  
Dipole Antenna ◽  
Geometric Shape ◽  
Degree Of Freedom ◽  
Radiation Characteristics ◽  
Wide Bandwidth ◽  
Frequency Bands ◽  
Additional Degree ◽  
High Band ◽  
24 Ghz

This work presents fence shaping for dipole antenna operating at 5G high-band frequencies. A via fence is employed around the dipole to suppress back radiation. By varying the geometric shape of the fence, the dipole’s radiation characteristics can be controlled, which adds an additional degree of freedom to the design. This was investigated by studying different fence shapes, namely rectangular-, U-, and V-shaped fences. The wide bandwidth (higher than 6.5 GHz) centered around 28 GHz, and the stable radiation performance from 24 GHz to 32 GHz made the proposed structure capable of supporting multiple 5G frequency bands and the fence shaping help modulate the gain and HPBW of the dipole. All fabricated prototypes attained front-to-back radiation ratio (F/B) higher than 36 dB, with good gain/HPBW performances of 14.1 dBi/103.7°, 13.5dBi/118°, and 12.6 dBi/133° from the V-fence, U-fence, and rectangular fence 4 × 1 arrays, respectively.

Hydromagnetic radiation from electric and magnetic dipoles in the magnetosphere

1969 ◽  
Vol 47 (16) ◽  
pp. 1643-1656 ◽  
Author(s):  
A. K. Sundaram
Keyword(s):  
Magnetic Field ◽  
Magnetic Dipole ◽  
Electric Dipole ◽  
Static Field ◽  
Radiation Characteristics ◽  
Magnetostatic Field ◽  
Magnetic Dipoles ◽  
The Waves ◽  
Dipole Sources ◽  
The Magnetic Field

This paper deals with the radiation characteristics of elementary electric and magnetic dipoles in a homogeneous, anisotropic, cold plasma of infinite extent with a uniform magnetostatic field. The cases treated include the electromagnetic sources taken parallel and perpendicular to the magnetostatic field. In all cases expressions for the field components are obtained which are valid at frequencies well below the ion cyclotron frequency. It is found that electric and magnetic dipole sources when oriented perpendicular to the magnetic field excite both ordinary and extraordinary modes. For the ordinary mode, the waves are guided in both directions within cones of small apex angle aligned with the static field. When the dipole sources are aligned with the magnetic field, it is found that the electric dipole excites only the ordinary mode leading to guided wave propagation, while the magnetic dipole excites only the extraordinary mode. In all cases the waves propagate at Alfvén speed. The radiation characteristics are isotropic for the extraordinary mode excited by the perpendicular electric dipole and are nearly isotropic for the aligned magnetic dipole. For other cases the radiated power is concentrated in opposite directions along the static field.

Electric dipole and quadrupole moment and dipole polarizability of CS, SiO and SiS

2000 ◽  
Vol 98 (8) ◽  
pp. 481-491 ◽  
Author(s):  
George Maroulis, Constantinos Makris, Deme
Keyword(s):  
Quadrupole Moment ◽  
Electric Dipole ◽  
Dipole Polarizability
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