Bandpass Filters
| Price: |
US $ 1.00/Piece |
| Trade Terms: |
FOB,CIF,FCA |
| Min Order: |
1/Piece |
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T/T,Paypal,Western Union |
An example of an analogue electronic band-pass filter is an RLC circuit (a resistor-inductor-capacitor circuit). These filters can also be created by combining a low-pass filter with a high-pass filter.
Bandpass is an adjective that describes a type of filter or filtering process; it is to be distinguished from passband, which refers to the actual portion of affected spectrum. Hence, one might say "A dual bandpass filter has two passbands." A bandpass signal is a signal containing a band of frequencies not adjacent to zero frequency, such as a signal that comes out of a bandpass filter.
An ideal bandpass filter would have a completely flat passband (e.g. with no gain/attenuation throughout) and would completely attenuate all frequencies outside the passband. Additionally, the transition out of the passband would be instantaneous in frequency. In practice, no bandpass filter is ideal. The filter does not attenuate all frequencies outside the desired frequency range completely; in particular, there is a region just outside the intended passband where frequencies are attenuated, but not rejected. This is known as the filter roll-off, and it is usually expressed in dB of attenuation per octave or decade of frequency. Generally, the design of a filter seeks to make the roll-off as narrow as possible, thus allowing the filter to perform as close as possible to its intended design. Often, this is achieved at the expense of pass-band or stop-band ripple.
The bandwidth of the filter is simply the difference between the upper and lower cutoff frequencies. The shape factor is the ratio of bandwidths measured using two different attenuation values to determine the cutoff frequency, e.g., a shape factor of 2:1 at 30/3 dB means the bandwidth measured between frequencies at 30 dB attenuation is twice that measured between frequencies at 3 dB attenuation.
Optical band-pass filters are common in photography and theatre lighting work. These filters take the form of a transparent coloured film or sheet.
| Prod Model: |
Custom-made |
| Markets: |
North America,South America,Eastern Europe,Southeast Asia,Africa,Oceania,Mid East,Eastern Asia,Western Europe |
| Principle: |
Cut-off Filter |
| Material: |
Glass |
| Type: |
Bandpass Filters |
| Shape: |
Custom-Made |
| Certification: |
SGS |
Nanjing Co-Energy Optical Crystal Co., Ltd. is a professional customized crystal & optics manufacturer in China. We provide laser crystals made from YAG series, with different doped concentration, KTP, BBO & optical components from sapphire, optical glasses, fused silica, quartz, color glass and IR materials.
Our laser rods, optical lenses, prisms, windows, lightguides, mirrors, filters, and coating products etc are widely used in laser industry, science, education, Aesthetic, medicine, communication and defense etc.
