![]() The notch filter is used in the test laboratory to filter out interference from other equipment. The notch filter is usually used in protecting an electronic circuit from damaging radio-frequency radiation. The filters are typically used to reduce the noise generated by the transmitter.Ī radio-frequency notch filter is a device that blocks radio waves, preventing them from entering or exiting a certain area of an electronic circuit. Notch filters are also used in radio frequency interference suppression. It can be placed in the front end of the receiver as well. The notch filter is usually placed between the antenna and the receiver so that it can help reduce the noise. What are the applications of Notch filters? In radio frequency communicationĪ notch filter can be used in RF modules to reduce the amount of noise that is picked up by the receiver. In some cases, notch filters are also used to limit the bandwidth of the signal, which can be used to reduce the frequency of the signal. This can be used to reduce noise in a signal or to reduce a signal’s bandwidth without changing the frequency. Notch filters are used in a variety of applications including signal processing, signal detection, and signal filtering. These filters are specifically used in test environments where fine-tuning is necessary to avoid a certain frequency range. Tunable notch filters are band-reject filters with tunable knobs or controls to shift the frequency high or low. At 750Mhz, it has the highest attenuation and minimum attenuation for lower and higher frequency ranges. The above image shows the frequency response of the 750MHz notch filter. Frequency Response of Notch filter Frequency response of a 750MHz notch filter Package type: notch filters are available from millimeter size (used in RF modules) to a few inches long (used in high power applications). Miniaturized notch filters and SMD-sized filters are also available for various applications. Other specificationsĬonnector type: notch filters for RF test applications usually comes with an RF connector (SMA, N-type, etc.…). Operating temperature: notch filters are designed to operate accurately within a temperature range. The power level of the notch filter can vary depending on the applications and physical size of the filters. Power: the highest power level filter can handle. Insertion Loss: is the loss of the pass band region (typically very low IL for pass band frequency) and maximum attenuation level at the stop band. Passband range: the range of frequency it allows to pass through. Stop band (bandwidth): the range of frequency it blocks/attenuates. Source: electricalacademia What are the specifications of a notch filter? Below image shows electrical representation of notch filters in both configuration. In electronic circuits, notch filters can be constructed using LC (Inductor and Capacitor) combination in Series and Shunt configuration. It is one of the specifications of the filter. Stop band region: frequency range with a maximum attenuation level. Passband region: frequency range with minimum attenuation level (typically close to 0 dB). A band-reject filter with a narrow stop band is usually known as a notch filter. Notch filters are band-reject filters or stop band filters designed to provide maximum attenuation or rejection to a particular range of frequency.
0 Comments
Leave a Reply. |