DEA212495BT-7055A2

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RF filters are passive components used to separate wanted signals from the unwanted signals in a Radio Frequency (RF) stage. The filtering-type, technology and topology of the RF filters are determined by the desired application of the filter. The DEA212495BT-7055A2 is an example of a RF filter, specifically a high-order Microwave band pass filter with an insertion loss of less than 1 dB within the total bandwidth of 5.5GHz. Below are the main application field and working principles of the DEA212495BT-7055A2 filter.

Application Field

DEA212495BT-7055A2 is mainly applied in Wireless Local Area Network (WLAN) and Global System for Mobile communication (GSM) applications. The device has a total operating frequency range of 5100MHz to 5600MHz, with two adjacent passbands separated by two stop bands. This type of configuration offers a high degree of confidence that the wanted signals will be passed while weaker RF signals around the wanted channels will be attenuated. It is mainly used to reject interference within the WLAN and GSM frequency ranges while passing through the wanted frequency to the receiver.

Working Principle

The DEA212495BT-7055A2 filter is a bandpass filter with SMA female connectors. It is constructed using advanced hybrid, multi-metal microwave technology, which allows for a reduced total size while achieving high attenuation in the stop bands. The filter operates by passing only signals in the passbands while attenuating the wanted signals in the stop bands. The device utilizes a multiplexer to reduce the insertion loss of the filter, thus reducing the noise floor of the receiver while correspondingly increasing its gain. The multiplexer is essentially a switch which alternates between two input signals, allowing the signal path to be switched between the passband and the stop band depending upon the signal which is being received.

The device also features a 50 ohm input matching network which matches the input of the filter to the output power of the WLAN and GSM signals passing through it. The filter is designed to reject interfering signals which may be radiated from other Wireless Local Area Network (WLAN) and Global System for Mobile communication (GSM) systems. The device boasts excellent filter characteristics with low insertion loss, high rejection level, very low passband ripple and high return loss.

Conclusion

In conclusion, the DEA212495BT-7055A2 is a high-order Microwave band pass filter which has a total operating frequency range of 5.5GHz. It is mainly used in applications for WLAN and GSM applications as it is capable of rejecting interference while passing the wanted frequencies to the receiver. The filter provides excellent filter characteristics such as low insertion loss, high rejection level, very low passband ripple and high return loss.

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