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EMI/RFI Electronic Filters

Integrated circuits are often a source of EMI, but they must usually couple their energy to larger objects such as heatsinks, circuit board planes and cables to radiate significantly. On integrated circuits, important means of reducing EMI are: the use of bypass or decoupling capacitors on each active device (connected across the power supply, as close to the device as possible), rise time control of high-speed signals using series resistors, and VCC filtering. Shielding is usually a last resort after other techniques have failed, because of the added expense of shielding components such as conductive gaskets. Interference in radio astronomy, where it is commonly referred to as radio-frequency interference (RFI), is any source of transmission that is within the observed frequency band other than the celestial sources themselves. Because transmitters on and around the Earth can be many times stronger than the astronomical signal of interest, RFI is a major concern for performing radio astronomy. Natural sources of interference, such as lightning and the sun, are also often referred to as RFI. Some of the frequency bands that are very important for radio astronomy, such as the 21-cm HI line at 1420 MHz, are protected by regulation due to spectrum management. However, modern radio-astronomical observatories such as VLA, LOFAR and ALMA have a very large bandwidth over which they can observe. Because of the limited spectral space at radio frequencies, these frequency bands can not be completely allocated to radio astronomy. Therefore, observatories need to deal with RFI in their observations.

EMI/RFI Electronic Filters > EMI Filter

型号	DS	厂牌	批号	数量	地区	采购
EXCCET103U		Panasonic	-	3000	中国	要求报价
EXCCET103U		Panasonic	2014+	12115	新加坡	要求报价
EXCCET103U		Panasonic	2010+	774	中国	要求报价
EXCCET103U		Panasonic	2014+	32	日本	要求报价
EXCCET103U		Panasonic	2014+	32	日本	要求报价
EXCCET103U		Panasonic	2013+	10000	中国	要求报价
EXCCET103U		Panasonic	2021+	20000	中国	要求报价
EXC-CET103U		Panasonic	-	63000	香港	要求报价
EXCCET103U		Panasonic	-	1400	印度	要求报价
EXCCET103U		Panasonic	2014+	4773	中国	要求报价
EXCCET103U		Panasonic	-	12721	中国	要求报价
EXCCET103U		Panasonic	-	15133	中国	要求报价
EXCCET103U		Panasonic	2008+	1000	中国	要求报价
EXCCET103U		Panasonic	-	3000	中国	要求报价
EXCCET103U		Panasonic	-	100	中国	要求报价
EXCCET103U		Panasonic	2013+	2000	中国	要求报价
EXCCET103U		Panasonic	2013+	21000	中国	要求报价
EXCCET103U		Panasonic	-	6000	中国	要求报价
EXCCET103U		Panasonic	2008+	1000	中国	要求报价
EXCCET103U		Panasonic	2011+	2733	中国	要求报价
EXCCET103U		Panasonic	2013+	467	中国	要求报价
EXCCET103U		Panasonic	2024+	11669	中国	要求报价
EXC-CET103U		Panasonic	-	105	中国	要求报价
EXCCET103U		Panasonic	-	3000	香港	要求报价

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