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Ceramic Filters

Ceramic filters, such as the CER0459A, offer excellent performance in radio-frequency and other wide-frequency electronic applications. Their design is based on a simple principle of ceramic dielectric property.

CER0459A Application Field and Working Principle

Ceramic filters, such as the CER0459A, are designed to pass and reject frequencies at a preset level. They are designed to operate in an environment where very narrow frequency bands are required, such as in wireless communication systems, or in medical imaging systems. The design of the CER0459A ceramic filter is based on a simple principle of ceramic dielectric property. The ceramic consists of a dielectric material that has a predictable frequency dependent response. This response is then used to create an attenuation curve that passes desired frequencies and rejects undesired frequencies.

The CER0459A is a high-frequency ceramic filter that can be used in a range of applications including direct pick-up, broadcast, cellular phones, and mobile radio. The filter has a passband of 2-10 MHz, with a passband insertion loss of 2 dB. It has a high-side rejection of 60 dB, and a low-side rejection of 40 dB. The insertion loss is the measure of the filter’s ability to reject unwanted frequencies while allowing desired frequencies to pass through. The filter is designed for use in noise-critical applications such as in receivers, transmitters, or in systems that require immunity to broadband jamming.

The CER0459A is constructed of two piezoelectric ceramic disks, one for the passband and one for the reject band, placed in a plastic or machined aluminum case. The passband ceramic disk is designed to resonate at a frequency that is determined by the thickness of the ceramic material. The reject band ceramic disk is designed to reject all signals at a frequency greater than its resonance frequency. The overall performance of the filter is determined by the degree of attenuation at the cutting points of the passband and the reject band. The filter can be designed to pass signals from 2-10 MHz and reject any signals above or below this range.

The CER0459A is a high-performance ceramic filter designed for use in wide-frequency applications. It provides superior noise suppression over a wide frequency range, and has high-side and low-side rejection of up to 60 dB. The filter is a cost-effective solution for applications requiring wide-frequency selectivity, and can be used in a variety of applications including direct pick-up, broadcast, cellular phones, and mobile radio.

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