C-Band Bandstop Filter

C-Band Cavity band stop filter

C-Band Bandstop Filter definition

A C-Band bandstop filter is a special type of filter that rejects a band of frequencies but allows signals with frequencies that are lower and higher than this stopband to pass through. A band stop filter can also be called by other names like band reject filter or notch filter. You can think of it as the inverse of a bandpass filter or a combination of a low pass filter and a high pass filter. A typical band stop filter has a frequency characteristics that look something like this:

Band stop Filter Frequency response

Hence a typical C-Band bandstop filter rejects a narrowband of frequencies in the C-band (4-8GHz). Due to the high frequency of C-Band, a C-Band band reject filter is usually constructed using cavity filters.

5.725-5.85 GHz Band Reject Filter: ABSF-5787M5BW125-01

ABSF-5787M5BW125-01 is a C-Band cavity band reject filter that is designed to reject signal components in the 5.8GHz ISM (Industrial, Scientific and Medical) band. It has two pass bands, a lower passband from dc – 5.695 GHz and an upper passband from 5.88-8GHz. The insertion loss in the passband is less than 2 dB. The filter has a 45 dB stopband rejection from 5725-5850MHz.

The table below is a summary of some of our C-Band bandstop filters. For other stopband and passband characteristics, enquire here.

For information regarding other RF components like directional couplers, power dividers, amplifiers or customized assemblies, click here.

Part NumberStopbandStopband rejectionPassbandInsertion LossDescription
ABSF-5787M5BW125-015725 – 5850 MHz45 dB mindc -5695 MHz
& 5880~8000MHz
2.5 dB max5725 – 5850 MHz C-Band Cavity band reject filter
ABSF-5592M5BW265-015460 – 5725MHz45 dB minDC~5400MHz
& 5785~8000MHz
2 dB max5460 – 5725 MHz C-Band Cavity band reject filter
ABSF-5200MBW100-015150~5250MHz45 dB minDC~5125MHz
& 5275~8000MHz
2.5 dB maxMHz C-Band Cavity band reject filter

For more information regarding our products or to get a customized filter designed specially for your applications at no extra cost, click on the blue button now.

The Strengths & Capacities Of C-Band Band Stop Filters

The electromagnetic, or radiofrequency band is a busy, yet unseen, highway in the sky, where communication and data transmissions zoom as fast as the speed of light, and crisscross each other. But in each of the radio bands where transmissions come and go, who acts like a traffic policeman, and ensures that the various signals don’t bump or step on each other, or distort each other? That’s the job of electronic filters. And as there are different types of electronic filters working in various bands, among these include “band stop” filters for the C-band spectrum. Let’s take a brief look at how this filter type operates.

The C-Band was First Used For Satellite Communications

The C-band, according to electronics and communications experts, is actually the first band used for satellite communications, and has remained steadfast and reliable through the decades. And in this complex and highly-technical realm, C-band band stop filters do their jobs efficiently, allowing certain signals to pass, while attenuating others.

The C-band is truly reliable frequency range because it allows for wide area coverage, and it’s also extremely resilient to severe weather conditions like heavy rain, fog, and strong winds. And since the C-band is resilient to the elements, it’s used for sending TV program transmissions anywhere in the world, from Latin America to Africa and Asia, as well as in the US.

Out of the 145 existing C-band satellites, 115 are utilized for broadcasting, whether it’s news, public events, sports, or popular soap operas and comedies. The band also feeds terrestrial transmission networks, and provides direct-to-home services in certain remote areas.

And thanks to this very useful band, weather forecasters now have an easier time predicting if a hurricane or typhoon is forming somewhere in the Atlantic or Pacific oceans, or if a tornado is forming somewhere in the vastness of the southern plains in the United States.

Band-Stop Filters, And Why They Are Called Many Names

Of the different types of RF filters, band stop filters are unique devices, as these are called different names. As they are filtering devices, their main task is to permit or allow only those components on the frequency domain whose frequencies lie below one critical value, or above another critical value, to pass through with little or minimal “attenuation” or loss. Any frequency that lies between the critical values or levels are then attenuated.

Band stop filters are used in many fronts. They’re currently used to filter noise or distortions, especially with DSL internet service. They’re also used in a lot of household appliances, particularly to considerably reduce the 60 hertz (Hz) interference coming from the walls of houses.

This device is also widely utilized for wireless communication and satellite communication, as it has two distinct cut-off frequencies which provide the high and low ends of the range, and any frequency that falls out of this range will be attenuated.

Today’s crop of C-band band stop filters are a tough, hardworking bunch. Most filter variants provide low insertion loss, sharp out-of-band rejection, and effective muting of the channels of a specific service provider, while allowing other frequencies to pass trouble-free.

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