CER0325E

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Ceramic filters are a broadly-used type of bandpass filter, commonly used in wireless telecommunication systems for both receiver and transmitter channels. It is also used in signal processing applications such as for digital audio and for military radio systems due to its wide bandwidth and small size. CER0325E is an easily realized, cost-effective ceramic filter that meets the needs of many applications.

Ceramic filters typically employ a combination of capacitance, inductance, and resistance to create a balanced assembly of frequency responses and signals at specific frequencies are known to pass through with minimal attenuation. The CER0325E utilizes this same technology, but with three capacitors and two inductors for additional performance benefits.

Application Field

The CER0325E is particularly suitable for medium and high frequency wireless communication applications that require a wide bandwidth and good selectivity, such as 2-way radio communications, cell phone base stations, digital communication systems, wireless local area networks (WLANs), VHF/UHF television broadcast, and satellite communication systems.

In comparison, the CER0325E is more suited to medium- and high-frequency communication systems than the regular CER series due to its wider bandwidth and higher selectivity. It is also capable of maintaining the broadband characteristics of the signal even when transmit power is increased, thereby providing more reliable coverage for base station communication systems.

Working Principle

The CER0325E is an integrated filter featuring three capacitors and two inductors. It is built for precision and stability over a wide temperature range. It has a wide passband and a narrow insertion loss, as low as 0.53dB in the center frequency.

At the heart of the filter’s design are the three capacitors, each of which contributes differently to the overall frequency response. The first two capacitors are constructed with the same dielectric material and arranged in series. This combination enables the capacitor to achieve a wide passband but also helps to reduce the insertion loss, the amount of signal attenuated when passing through the filter. The third capacitor is arranged in parallel and used to reduce the passband shape distortion when compared to a similar non-milky layer device. Together, these three capacitors, as well as two inductors, result in a frequency response that is ideally tailored for its intended application.

In addition to its impressive passband performance, the CER0325E is extremely stable over temperature, with a temperature coefficient of 2.5ppm/°C. This means that the passband of the filter will not shift significantly as environmental conditions vary. This makes the CER0325E a viable option for applications where a wide temperature range is expected, such as those found in automotive and aerospace applications.

Finally, the CER0325E features a high input impedance, making it suitable for direct connection to antenna systems. This eliminates the need for costly impedance matching components, offering designers more flexibility in their system layout.

In summary, the CER0325E is an ideal ceramic filter solution for medium and high frequency wireless communication applications, offering designers a wide passband, low insertion loss, wide temperature range operation, and direct connection to antenna systems. This makes the CER0325E a robust, cost-effective filter choice for many applications.

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