Bandpass Filters
| Price: |
US $ 1/Piece |
| Trade Terms: |
FOB,CIF,FCA |
| Min Order: |
1/Piece |
| Pay Type: |
T/T,Western Union,Paypal |
Product Specifications
| 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 |
Product Description
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.
Nanjing Co-Energy Optical Crystal Co., Ltd. is one of the most professional suppliers of optics and optical components in China and our products range from different windows, lenses, prisms, mirrors, filters, beamsplitters, IPL Light guides and filters, tips and rods and so on. Our processing material varies a lot, from different optical glass, fused silica to crystal, i. e, Sapphire, CaF2, BaF2 and Germanium and Silica and more.
Pur products, which are strictly produced according to USA military specification MIL-O-13830A and ISO 10110 with advanced inspection devices, well quality control systems, ensuring our products in good quality and best performance in their own applications.
Most of our products are exported to USA and European companies, which are widely used in laser industry, biotechnology industy, communication and defense. Co-Energy makes every effort to provide high qualified components and devices at lower price. We have developed a series of specialized optical fabrication techniques for polishing in line with the highest international standards.
Co-Energy sales team is a group of energetic young people who have rich experiences of working. Our sincere attitude for quality and service prepared ourselves very well serving for the internation markets.
