FI212C249566-T Filters

Series:	FI
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Frequency:	2.495GHz Center
Bandwidth:	390MHz
Filter Type:	Balance
Ripple:	1.2dB
Insertion Loss:	2.9dB
Mounting Type:	Surface Mount
Package / Case:	0805 (2012 Metric), 6 PC Pad
Size / Dimension:	0.079" L x 0.049" W (2.00mm x 1.25mm)
Height (Max):	0.039" (1.00mm)

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FI212C249566-T Application Field and Working Principle

RF Filters are an essential component of high frequency or radio frequency communication devices. The FI212C249566-T is a wide band, high frequency filter which is especially designed for applications requiring an exact tuning capability over a wide frequency range. Its wide transmission bandwidth, small size, inexpensive cost and low power consumption make it an ideal choice for a wide variety of applications.

Application Field

The FI212C249566-T is widely used in communication devices based on World Wide Interoperability for Microwave Access (WiMAX), ZigBee, Wi-Fi, and other wireless communication technologies. It can also be used in cellular base stations, GPS navigators, RF identification (RFID) systems, and radar receivers. In addition, it finds application in low noise amplifiers, filters for FM radio and microwave radio communication, and transceiver designs.

Working Principle

The FI212C249566-T is an inductive-capacitive (LC) filter which consists of two vials filled with oil, a tuning coil, two capacitors, and a center conductor. The filter is designed to pass only frequencies within a specific band while rejecting all frequencies outside this band. Tuning the coil adjusts the cutoff frequencies of the filter so that the desired frequency band can be selected.The main working principle of the filter is to cause resonance within the capacitor-coil-capacitor (CCC) circuit. When the oscillatory capacitor-coil circuit is of similar frequency as the input signal wavelength, resonance is created in the CCC circuit which strengthens the input signal as it passes through the coil. With further tuning, the resonance is maintained and only those signals within the specific frequency range pass through.In order to optimize the performance of the device, the capacitors within the filter are specially designed to have low reactance, thus allowing the filter to respond quickly when the cutoff frequency is adjusted. Additionally, the oil inside the filter helps to reduce losses and extend the lifetime of the device by providing a more balanced inductance at high frequency ranges.

Conclusion

The FI212C249566-T is a wide band, high frequency filter that has many applications in communication and navigation systems. Its wide transmission bandwidth, small size, inexpensive cost and low power consumption make it attractive for many designs. The working principle of the filter is based on the LC filter design, which uses resonance within the capacitor-coil-capacitor (CCC) circuit to adjust the cutoff frequencies of the filter so that the desired frequency band can be selected. Special capacitors and oil within the filter are used to further optimize the performance and lifetime of the device.

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