REV 4- Antenna Systems Part 2

refers to an element of antenna array directly connected to the transmission line.

• a. Driven Elements

• b. Parasitic Element

• c. Driven Array

• d. Parasitic Array

refers to an element of antenna array that is not directly connected to the transmission line and only receive energy via coupling.

• a. Driven Elements

• b. Parasitic Element

• c. Driven Array

• d. Parasitic Array

An array in which all elements are supplied with power or fed directly from the transmission line. All elements are driven elements.

• a. Driven Elements

• b. Parasitic Element

• c. Driven Array

• d. Parasitic Array

An array in which one or more elements are parasitic.

• a. Driven Element

• b. Parasitic Element

• c. Driven Array

• d. Parasitic Array

A parasitic element longer than the driven element and close to it reduces signal strength in its own direction and increases it in the opposite direction.

• a. Reflector

• b. Deflector

• c. Yagi-Uda Antenna Array

• d. Log Periodic Dipole Antenna Array

A parasitic element shorter than the driven one from which it receives energy; tends to increase radiation in its own direction.

• a. Reflector

• b. Director

• c. Yagi-Uda Antenna Array

• d. Log Periodic Dipole Antenna Array

This refers to a linear antenna array consisting of one driven element which is essentially a dipole and two or more parasitic elements called director and reflector.

• a. Reflector

• b. Director

• c. Yagi-Uda Antenna Array

• d. Log Periodic Dipole Antenna Array

A special version of the driven array and is a wide bandwidth antenna. The lengths of the driven elements vary from long to short and are related logarithmically. Bandwidths of 10:1 are achievable with ease. Main feature is frequency independence for both radiation resistance and pattern

• a. Reflector

• b. Director

• c. Yagi-Uda Antenna Array

• d. Log Periodic Dipole Antenna Array

Simplest array which consists of a number of dipoles of equal size, equally spaced along a straight line with all dipoles fed in the same phase from the same source.

• a. Broadside Array

• b. Endfire Array

• c. Log Periodic Dipole Antenna Array

• d. Yagi-Uda Antenna Array

Physical arrangement is the same as that of the broadside array. The magnitude of the current in each element is still the same as in every other element, there is now a phase difference between these currents.

• a. Broadside Array

• b. Endfire Array

• c. Yagi-Uda Antenna Array

• d. Log Periodic Dipole Antenna Array