AFS390E Filters

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AFS390E Application Field and Working Principle

SAW (Surface Acoustic Wave) Filters are an integral part of communication systems, finding applications where low energy signals need to be transmitted and received with minimal loss and interference. The AFS390E is a SAW bandpass filter which operates at frequencies up to 20GHz and offers up to 60dB of attenuation at extremely high stop band frequencies. This makes it ideal for applications where a considerable amount of insertion loss is required.

The AFS390E filter utilizes SAW technology to achieve its extremely high specifications. SAW filters are comprised of a resonating device, usually in the form of an interdigital transducer (IDT), which is an array of fingers that has an acoustic wave resonating within it. On each side of the IDT is a reflector, which is then followed by one or more dampers, and a spacer plate. The resonance frequencies of an IDT can be controlled by changing the thickness of the reflectors, the spacing between the fingers, and the total size of the transducer. This effect is used in the AFS390E to achieve the narrow passband with extremely high attenuation.

The main differences between the AFS390E and other SAW filters are the construction materials and design. Instead of the standard buried IDT design, the AFS390E utilizes an all-glass construction, which not only reduces the cost of the filter but also improves its form factor. The filter is also designed to be low profile, which makes it ideal for use in ultra-thin devices. The AFS390E also utilizes a low insertion loss design, which improves the overall efficiency of the filter and allows the user to benefit from increased performance.

The AFS390E filter can be found in a variety of applications, ranging from broadband communication systems to radar and satellite systems. It can be used to increase signal integrity, reduce interference and filter unwanted signals. The filter is also capable of providing precision bandpass characteristics, making it ideal for applications where high image rejection is desired. In addition, the AFS390E is designed to operate over a wide temperature range and with very low power requirements.

Overall, the AFS390E is an excellent example of SAW filter technology, offering excellent performance and low cost due to its all-glass construction. Its low profile design and low insertion loss make it perfect for space-constrained applications. Its wide bandpass and excellent attenuation characteristics make it a reliable choice for high performance applications, such as broadband communication systems, satellite systems and radar systems.

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