active element

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In order to obtain reconfigurable directive patterns parasitic elements are placed in vicinity of the driven element (see Fig.
In planar version, the most adopted driven element was often selected to be electric dipole because it would bring the NFRP antenna a broad bandwidth characteristic [22], but it has a relative large back lobe and needs some special technique for feeding, thus restricts ESA's application.
The lengths of the directors are smaller than that of the driven element. The elements of Yagi-Uda antenna which are driven director and reflector are parallel in one plane assist on a single crossbar.
A set of microstrip lines are introduced between the driven element and the first director element to enhance the coupling between them, and therefore the bandwidth could be increased and the back lobes could be suppressed.
For compact fabrication and bidirectional applications, we improve the traditional Yagi-Uda antenna by removing the reflector and arranging the directors along both sides of the driven element, as shown in Figure 2.
Then the designed coupler is integrated into the driven element without increasing the antenna size [9].
The standardized, high-precision piezoelectric motor, on the other hand, is operated on the base of a micro-subtle driving movement, whereas the driven element is moved in thousands of small steps.
NHC's ControlPoint(TM) solutions utilize a high- performance software driven Element Management System (EMS) controlling an automated, true any-to-any copper cross-connect switch to enable incumbent local exchange carriers (ILECs) and enterprises to remotely perform the four key tasks that historically have required manual on-site management.
NHC's ControlPoint(TM) solutions utilize a high-performance software driven Element Management System (EMS) controlling an automated, true any-to-any copper cross-connect switch to enable incumbent local exchange carriers (ILECs) and enterprises to remotely perform the four key tasks that historically have required manual on-site management.
The male segment is generally mounted onto the motor and the other half Onto the driven element. When maintenance is required the motor is simply unbolted and the coupling pulls effortlessly apart.
The antenna consists of a director, driven element and reflector.