parasitic element

parasitic element

[¦par·ə¦sid·ik ′el·ə·mənt]
(electromagnetism)
An antenna element that serves as part of a directional antenna array but has no direct connection to the receiver or transmitter and reflects or reradiates the energy that reaches it, in a phase relationship such as to give the desired radiation pattern. Also known as parasitic antenna; parasitic reflector; passive element.
References in periodicals archive ?
The distance between the parasitic element and the driven element can also contribute to size reduction.
Meanwhile, it has been demonstrated in [11] that a crossed dipole antenna with parasitic element could achieve a wide 3 dB ARBW of 63.4%.
Practically, the influence of nonideal current/voltage gain and parasitic element in VDCC will affect the performances of the proposed oscillator.
When the length of the parasitic element is shorter than that of the active element, a pulling pattern is obtained.
A move to the double-trench architecture, which places the gate and source in their own trenches, eliminates the parasitic element. The structure further reduces on-resistance compared to the single-trench design and, thanks to reductions in the electric field strength around the gate, should deliver even higher reliability.
The most famous one called "EZ" small antenna [9] [12] [16] [17] generally employs electric monopole or semi loop as driven element and epsilon negative (ENG) metamaterial or capacitively loaded loop (CLL) as parasitic element, but it always seem to be too cumbersome to assemble on aircraft and other unmanned vehicle.
In 3 of these cases, a histopathological correlation was available, which revealed definite parasitic element of cysticercosis in 2 cases and the remaining case was reported as suggestive of parasitic lesion in view of absence of any parasitic element.
The outer microstrip patch with length "a" does not have significant current passing inside of it compared to others, because it is the second parasitic element and stays further from the feed line compared to the parasitic circle.
In addition, the performance of a patch antenna can be altered by introducing a parasitic element. The parasitic element can either be placed in the plane of the patch antenna on the same substrate or placed above it in a stacked arrangement.
Q3D Extractor uses the Method of Moments (MoM) (8) and Finite Element Method (FEM) to solve Maxwell equations and compute parasitic element matrices.
In conventional CRLH unit cell the parallel capacitor (and also series inductor) acts as a parasitic element. However, in our modified unit cell it is created by a separate IDC, therefore we can have tuned elements in both series and parallel branches which leads to maintaining the characteristic impedance almost constant by varying tuned capacitors.
Rogue salesmen and workers are a parasitic element of society.