KNH21220-3AA

Current:	1A
Height:	0.037" (0.95mm)
Size / Dimension:	0.079" L x 0.049" W (2.00mm x 1.25mm)
Package / Case:	0805 (2012 Metric)
Mounting Type:	Surface Mount
Voltage - Rated:	50V
Applications:	General Purpose
Operating Temperature:	-25°C ~ 85°C
ESD Protection:	No
Values:	C = 22pF
Series:	KNH, Kyocera
Resistance - Channel (Ohms):	0.08
Attenuation Value:	--
Center / Cutoff Frequency:	--
Technology:	LC
Filter Order:	--
Type:	Low Pass
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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EMI/RFI Filters (LC, RC Networks) are essential components for electrical circuits, and the design of such components is very important for ensuring signal quality and noise immunity. The KNH21220-3AA is an EMI/RFI filter developed by Kantatsu Electronics Inc. which is a Chinese-based manufacturer of EMI/RFI filters. This double-sided filter consists of two capacitors and two inductors in an LC RC network configuration.
The KNH21220-3AA has an application field of high-frequency radio communications and information equipment. It is designed to reduce unwanted electromagnetic interference and thus improve signal reliability by suppressing both high frequency and low frequency noise signals. The filter limits the amplitude of electric field disturbance to comply with the requirements of the applicable electromagnetic compatibility standards.
The working principle of the KNH212 20-3AA is as follows. First, the filter comprises two series capacitors and two series inductors, all of which are interconnected to form an LC RC network. The capacitors react to high frequency noise signals and attenuate them while the inductors react to low frequency noise signals and suppress them. This combination of capacitors and inductors ensures that both high frequency and low frequency noise signals are efficiently reduced.
The KNH21220-3AA is performable due to its unidirectional low pass filter, which allows it to filter electromagnetic interference from a high frequency signal while passing the desired low frequency signal. First, the high frequency radio signal is connected to the circuit, and then it is split into two signals at the input terminal. The two signals pass through two series capacitors in the LC network, which reduce the high frequency signals to a low frequency level. At the output terminal, the two signals are recombined into a single low frequency signal.
In addition, the filter is also designed with an impedance control system that maintains the balance and impedance levels across the entire passband. This is crucial for ensuring that the desired signals are not affected by electromagnetic interference and that no oscillations can be present. Furthermore, the filter is also designed with an isolation system that isolates the filter from the impact of external electromagnetic fields. Through this, the KNH21220-3AA can provide reliable and efficient noise suppression.
All in all, the KNH21220-3AA is an effective EMI/RFI filter designed to reduce unwanted electromagnetic interference and improve signal reliability in radio communications and information equipment. Its combination of two series capacitors and two series inductors, together with its impedance control and isolation systems, ensure that both high and low frequency noise signals are efficiently reduced while the desired signals remain undistorted.

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