RF Front-end Filters
1. Low-pass filter: Used at the input of UAV receiver, with cut-off frequency about 1.5 times of the maximum operation frequency, to block high-frequency noise and overload/intermodulation.
2. High-pass filter: Used at the output of UAV transmitter, with cut-off frequency slightly lower than the minimum operation frequency, to suppress low-frequency spurious emission interference.
3. Bandpass filter: With center frequency being the UAV operation band and bandwidth covering the entire operation bandwidth, to select the desired signal band.
Intermediate Frequency Filters
4. Wide bandpass filter: With center frequency being the IF and bandwidth covering the signal bandwidth, to select the IF signal after frequency conversion.
Narrow bandpass filter: For IF signal equalization and noise suppression.
5. Harmonic Filters
Low-pass filter: At transmitter output to suppress harmonic emissions above operation frequency.
Notch filter: To selectively and significantly attenuate known harmonic frequencies of the transmitter.
6. Filter Banks: Combining multiple filters to achieve better selectivity and suppression of unwanted frequency bands and spurious emissions.
The above are some typical applications of filters in RF front-end and IF processing of UAV communications, to improve signal quality and selectivity. There are also phase filters, programmable filters used in Beamforming networks.
Concept Microwave is a worldwide supplier of the customized filters , including the lowpass filter , highpass filter , notch/band stop filter , bandpass filter and filter banks. For more details , please visit our web: www.concept-mw.com or reach us at: sales@concept-mw.com .
Post time: Sep-27-2023