RF3404E Filters

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Surface Acoustic Wave (SAW) Filters are filtering components used to select one signal frequency from a wide variety of very different frequencies. The RF3404E is one such component, capable of rejecting undesired frequencies while allowing desired frequencies to pass with minimal distortion. This article will discuss the application field and working principle of the RF3404E in detail.

In applications such as mobile communication systems, radio base stations, cellular phones, GPS receivers, satellite radio receivers, digital still cameras, and wireless LANs, the strong frequency filters provided by the RF3404E certainly come in handy. The 4GHz to 4.8GHz RF3404E filter is a notch filter with four stages of Chebyshev response; it has excellent out-of-band attenuation and good in-band return loss. The RF3404E is an ideal Frequency Selective Surface (FSS) solution, designed and tested to provide customized designs with excellent performance.

The working principle of the RF3404E filter is relatively simple: it is designed to select a frequency signal of 4GHz~4.8GHz. The RF3404E is a SAW filter consisting of two pieces of piezoelectric substrate on either side of a patterned metallic interdigital transducer or IDT. The input and output ports of the filter are connected to the IDT, allowing the input RF signals to enter the filter through the input port, where it is converted into an acoustic wave by the IDT. The wave then propagates in both directions, with the undesired frequencies being filtered out and reflected from the substrate. The output port will collect the reflected signal and the desired frequencies are thus separated from the other frequencies and output through the filter.

The acoustic filter offers good wideband harmonic distortion rejection, as well as excellent surface flatness and temperature stability. The SAW filter\'s low-cost and high performance characteristics make it suitable for various applications, including consumer goods, medical devices, RF communications equipment, GPS receivers, and autonomous vehicles. In addition, the filter also features high-frequency and tight-tolerance passband attuned with the performance of the IDT, providing extremely high output power.

The RF3404E offers excellent harmonic rejection over a wide range of frequencies, and its intuitive design and reliable components make it an ideal filter solution for any application. Overall, the RF3404E is a high-performance, cost-effective SAW filter solution that offers superior performance, stability, and reliable results.

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