Return Loss:	--
Applications:	--
Height (Max):	4.200" (106.68mm)
Mounting Type:	Connector Mount
Ingress Protection:	--
Termination:	Connector, SFU
Features:	--
Power - Max:	50W
Gain:	--
Series:	EXS
VSWR:	1.5
Number of Bands:	1
Antenna Type:	Whip, Straight
Frequency Range:	155MHz ~ 164MHz
Frequency (Center/Band):	159MHz
Frequency Group:	VHF (f
Part Status:	Active
Packaging:	Bulk

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RF Antennas Monopole Antennas

A monopole antenna is the basic form of a long wire antenna, where one terminal is connected to the ground and the other acts as the radiating element that is connected to the central feed point. It is also known as half-wave dipole antenna, which are fundamentally half-wave radiators with a single-terminal actively radiating antenna as compared to the traditional dipole antenna where there are two active terminals. The monopole antenna is usually designed by manufacturing two quarter-wave sections as vertical stubs below the feed point, and in some cases, a top-hat capacitive loading is also added.

Working Principle of EXS155SFU

The EXS155SFU is a small NFC monopole antenna operating in the 13.56 MHz band. Its fundamental working principle is based on the theory of electromagnetism and the Faraday effect, where the antenna is used to broadcast electromagnetic radiation in the form of an oscillating electric field. This oscillation in turn generates a directional wave that propagates from the antenna and is radiated to its surroundings. The frequency or the amount of oscillation that can be achieved is known as the radiation strength of the antenna, which is usually controlled through the tuning of the antenna impedance. The antenna is basically tuned to resonance in order to achieve maximum radiation strength and efficiency. For the EXS155SFU, it is tuned to the 13.56 MHz frequency in conjunction with proper match of the input impedance of the antenna which helps in achieving maximum radiation strength. As the frequency is increased, the antenna impedance changes and this results in the need to readjust the settings to ensure maximum radiation strength.

Application Field

Due to its small size and low power input, the EXS155SFU is mainly deployed in near field communication (NFC) applications. This type of antenna is typically used in NFC tags and smart cards for applications such as e-ticketing, access control, payment processing, etc. It is also used in handheld devices such as mobile phones and tablets. Apart from this, it can also be used in systems such as RFID and short range wireless communications. Due to its compact size, it is also suited for applications such us automotive, medical and consumer electronics. In conclusion, the EXS155SFU is a small, low power NFC monopole antenna operating in the 13.56 MHz band. It is used in applications such as e-ticketing, access control, payment processing, RFID and short range wireless communication applications. It is tuned for maximum radiation strength by adjusting the resonance frequency and impedance match.

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