Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Frequency - Center:	1.575GHz
Bandwidth:	2MHz
Insertion Loss:	1.15dB
Ratings:	--
Applications:	General Purpose
Mounting Type:	Surface Mount
Package / Case:	4-SMD, No Lead
Height (Max):	0.035" (0.90mm)
Size / Dimension:	0.079" L x 0.063" W (2.00mm x 1.60mm)

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AFS20A02-1575.42-T2 application field and working principle

Surface acoustic wave (SAW) filters are used in many electronic devices for front-end signal conditioning and controlling so they play an important role in modern communication systems. Due to their wide range of characteristics and features, they are commonly used in a variety of electrical and electronic fields. A typical SAW filter is the AFS20A02-1575.42-T2, which can be used in numerous application fields (such as automotive, medical, consumer, industrial and so on), and its working principles and characteristics are discussed in detail below.The AFS20A02-1575.42-T2 is a two-port SAW band-stop filter with a center frequency of 1575.42 MHz and a center frequency variation of within ±3 MHz. It has a high rejection level (attenuation >=30 dB) of the stop-band frequency range of 1500 to 1660 MHz, an insertion loss of less than 0.9 dB (typical) and a maximum response ripple of does not exceed 0.4 dB in the pass-band. As for the input and output impedance, the AFS20A02-1575.42-T2 has input/output impedances of each port of 50 ohms, a VSWRstanding wave ratio less than 1.4 and an isolation of greater than 14 dB. The filter is typically used as a receive pass-band filter in cellular and ISM (Industrial, Scientific and Medical Appliance) application. In addition, it can be used in time division multiple access (TDMA) cellular systems with a 14 dB tracking characteristic.SAW filters are widely used because of their small size, low power consumption, high stability and reliability, and superior performance when compared to traditional LC (Inductor/Capacitor circuits). AFS20A02-1575.42-T2 works in the same way, applying SAW technology to increase the effectiveness of communication and signal performance. In general, a SAW filter consists of an interdigited transducer (IDT) and a reflecting surface. An IDT consists of two electrodes that interpenetrate each other, and it is formed by etching an aluminum electroplated film onto a piezoelectric substrate, usually a lithium tantalate or quartz. The IDT acts as a transducer converting electrical energy into acoustic energy and vice versa. When an alternating signal is applied, the IDT vibrates along its length at a frequency determined by its design, thus creating an acoustic wave in the form of a symmetrical sinusoidal vibration.This wave is then transferred to the reflecting surface that is usually placed on the other side of the substrate. This reflecting surface acts as a mirror by reflecting the wave towards the emitter, where the wave is then diffracted slightly due to the unevenness of the substrate surface and its own reflection. This diffraction has two effects – firstly, it creates a narrow bandpass filter that is used to select a frequency range, and secondly, it has an increase in the gain or selectivity of the filter.In conclusion, the AFS20A02-1575.42-T2 is a two-port SAW filter used for signal conditioning and controlling, offering excellent characteristics and features, such as its high rejection level of the stop-band frequency range, its insertion loss, input/output impedances, and VSWR standing wave ratio. This filter is used in various applications such as automotive, medical, consumer, and industrial due to its small size, low power consumption, and high stability and reliability. The AFS20A02-1575.42-T2 is a great SAW filter option for those looking for front-end signal conditioning and control.

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