1748CF15A075E RF/IF and RFID

Series:	--
Packaging:	Cut Tape (CT)
Part Status:	Obsolete
Coupler Type:	Standard
Frequency:	1.71GHz ~ 1.785GHz
Coupling Factor:	20 ± 1dB
Applications:	--
Insertion Loss:	0.5dB
Power - Max:	3W
Isolation:	25dB
Return Loss:	14dB
Package / Case:	0805 (2012 Metric)
Supplier Device Package:	0805

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RF Directional Coupler (1748CF15A075E) is a small device which is used in the field of radio frequency (RF) to measure power, switch power, or provide impedance matching between two ports. It works by coupling a preset amount of energy from one port to another, and it is possible to use the device to measure the electric field in a radio transmitter. It has a wide range of applications, such as in radio transmissions, microwave engineering, cellular/mobile phone communications and cable television systems.The operation of the RF directional coupler has a direct connection to the underlying physics of radiowaves. A directional coupler works by creating an isolation between two ports, allowing for the transfer of a given amount of power to a separate port. The coupler is composed of two different kinds of circuits: a transmission line to separate the ports and several coupling elements which measure the power and adjust the load impedance (which is necessary to achieve a good coupling ratio). In a basic configuration, two ports are connected by a two-port network where one port is a source and the other is a load. The directional coupler is then connected in between these two ports to measure the power or balance out the load impedance. To measure the power, the coupler has two types of measurement ports. The first is called the unreferenced or direct port, while the other is referred to as the coupled port. With the unreferenced port, the coupler measures the total power delivered, and it is commonly used in radio frequency test instruments. The coupled port, meanwhile, measures the difference in the power between the two ports. This type of measurement is usually used to measure the load impedance of both ports. In addition to measuring power and balancing loads, the RF directional coupler also provides the ability to switch power from one port to the other. This is because the coupling cells can vary the directivity of the coupler from a one-to-one ratio (in which the same amount of power is delivered to both ports), to a one-way ratio (in which the power is delivered from one port to the other). This allows the user to switch the signal flow from one port to the other. The working principle of the RF directional coupler is based on the wave theory of radio transmission. The coupler is composed of several elements including a transmission line, a pair of coupled transmission lines, and several coupling cells which measure the power transferred between the two ports. The transmission line forms the central path, while the coupled transmission lines are responsible for coupling power from one port to the other. The coupling cells are then used to measure the power and balance out the impedance of the transmission lines. In conclusion, the RF directional coupler is an essential component in radio frequency applications, allowing for power measurement, switching, and impedance matching between two ports. While the working principle behind the device is based on the wave theory of radio transmission, the coupler is composed of several elements including a transmission line, a pair of coupled transmission lines, and coupling cells. This enables the device to effectively measure power, balance out the load impedance, and switch the power to either port.

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