Sage-Tips

What is end fire antenna?

Definition of end-fire array : a radio antenna with strong directional properties consisting of a number of antenna elements arranged in a line.

What is end fire radiation pattern?

The Radiation pattern of end-fire array is uni-directional. A major lobe occurs at one end, where maximum radiation is present, while the minor lobes represent the losses.

What is unique about an end fire antenna?

The end-fire array consists of a number of identical equally spaced antennae arranged along a line and carrying current of equal amplitude. The individual antennae are so excited that there is a progressive phase difference between adjacent antennae expressed in wavelengths.

What is the condition for an end fire array?

Explanation: In an End-fire array the maximum radiation is along the axis of the array. So it is at either 0° or 180°. In broad-side array the maximum radiation is perpendicular to the axis of array that is at 90°.

What is the difference between a broad side and end fire array antenna?

In broadside array, the direction of the maximum radiation is perpendicular to the axis of array; while in the end fire array, the direction of the maximum radiation is along the axis of array. Thus in the end fire array number of identical antennas are spaced equally along a line.

What is retro array?

A retro-directive array is capable of re-transmitting an interrogating signal back to its source without requiring a priori knowledge of its direction of arrival (DoA) or any signal processing. Learn more in: Novel Multi-Antenna and Smart Antenna Techniques for Next Generation Wireless Communication Networks.

What is an antenna array write difference between broadside and end fire array?

The direction of the main beam can be changed from 0 to by changing the progressive phase shift from . An array is said to be End-fire array if the main beam is along the axis of the array. An array is said to be Broadside array if the main beam is perpendicular to the axis of the array.

What is binomial array?

A binomial array is a non-uniform antenna array for which the elements are equally spaced with unequal amplitude excitation using a specified current excitation known as binomial excitation.

What is progressive phase shift of end-fire array?

What is the progressive phase shift of the end-fire array? Explanation: The progressive phase shift of the end-fire array is 180°. It is a linear array whose direction of radiation is along the axis of the array. For a broadside array it is 0°.

What is the difference between broadside and end fire antenna?

End-Fire Antenna Array An end-fire array has a similar arrangement of elements as the broadside arrangement but the crucial difference between the two configurations lies on the way of excitation. In end-fire array, the elements are fed out of phase generally 180°, while in case of broadside each element is fed with the current of the same phase.

How are the end-fire antennas fixed to the radome?

The end-fire antennas are held in slots along the exterior of the radome (our current method of fixing the antennas is described in further detail in Subsection 4.1). [2] The transmitter power is fed to an array of end-fire antennas in the rotodome via a duplexer.

What is the difference between end-fire array and broadside array?

An end-fire array has a similar arrangement of elements as the broadside arrangement but the crucial difference between the two configurations lies on the way of excitation. In end-fire array, the elements are fed out of phase generally 180°, while in case of broadside each element is fed with the current of the same phase.

How to enhance the gain of a printed end-fire antenna?

For the purpose of enhancing the gain of a printed end-fire antenna with broad bandwidth, we propose the non-resonant meander-line (ML) based artificial material and place it in front of the antenna.