AFS1575.42S4-T Filters

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Surface acoustic wave (SAW) filters are the most widely used filters in modern wireless communication systems. The AFS1575.42S4-T filter is a high-performance SAW filter specifically designed for use in applications such as GPS, WLAN, WiMAX, and 3G/4G LTE. This article will provide an overview of the AFS1575.42S4-T filter application field and working principle.

The AFS1575.42S4-T is a special bandpass SAW filter designed for use in communication systems. It consists of three cascaded SAW stages, which provide high frequency selectivity, narrow band rejection, and very good field performance. The AFS1575.42S4-T bandpass filter covers a frequency range from 1575.42 MHz to 1575.98 MHz with a bandwidth of 560 KHz. It has an insertion loss of 8 dB and excellent return loss of 16 dB. This makes it ideal for applications such as GPS, WLAN, WiMAX, and 3G/4G LTE.

In terms of structure, the AFS1575.42S4-T filter consists of three interdigital transducers (IDT) on a piezoelectric substrate, a device resistor array, and an acoustic reflector. The three IDTs are simultaneously driven in order to generate acoustic waves, which are then propagated along the substrate. The waves are reflected back at the acoustic reflector, and any signal within the desired frequency range will be allowed to pass through. The device resistor array controls the amplitude and frequency response of the filter.

The AFS1575.42S4-T filter has several advantages compared to other types of filters. First, it has a narrow bandwidth and high selectivity, allowing it to reject interfering signals outside the desired frequency range. It also offers high linearity, low noise, and low power consumption. Lastly, the filter is highly reliable and has a long lifespan.

The AFS1575.42S4-T filter is a high-performance SAW filter with excellent field performance that is designed for use in applications such as GPS, WLAN, WiMAX, and 3G/4G LTE. It consists of three cascaded SAW stages, which provide high frequency selectivity, narrow band rejection, and very good field performance. It is highly reliable and has a long lifespan, and it offers a combination of high linearity, low noise, and low power consumption. All these advantages make the AFS1575.42S4-T filter an ideal choice for modern communication systems.

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