S-Band Cavity Filter
S-Band Cavity Filter can have a passband frequency anywhere between 2 GHz to 4 GHz. This frequency band is used mainly for satellite communications system. For example, Digital Audio Radio Service (DARS) broadcasting operate in a portion of the S-Band frequency spectrum from 2.31 GHz to 2.36 GHz. This region is currently used by Sirius XM Radio.
S-Band Cavity filters also find many applications in military systems from 2.2-2.3 GHz.
Perhaps the most common and probably most crowded part of the S-Band is in the ISM Band of 2.4GHz band where you can find tons of wireless devices. These include Bluetooth, WiMAX, cordless phones just to name a few.
AWG Tech supplies many kinds of S-Band Cavity filter. One of them is ABPF-2290MBW20-01.
ABPF-2290MBW20-01: An S-Band Cavity Filter
ABPF-2290MBW20-01 is an S-Band Cavity filter having a center frequency of 2290MHz and a 1-dB passband bandwidth of 20MHz. The group delay variation from 2285 MHz to 2295 MHz is less than 3nS. Like all cavity filters, ABPF-2290MBW20-01 has low insertion loss and its insertion loss is less than 1 dB. The filter can provide more than 70 dB rejection at frequencies below 2.245GHz and at frequencies from 2.335-5 GHz.
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S-band Cavity Filters by AWG Tech
The table below lists a few of our S-Band Cavity Filters and their specifications. If you need something that is not in the table, please contact us with your requirements.
| Part Number | Center Frequency | Passband | Insertion Loss | Rejection |
|---|---|---|---|---|
| ABPF-2033BW10-01 | 2033 MHz | 2028 – 2038 MHz | 1 dB max | > 60dBc @ dc – 1973 MHz > 60 dBc @ 2093 – 4000 MHz |
| ABPF-2278BW20-01 | 2278 MHz | 2268 – 2288 MHz | 2 dB max | > 60dBc @ dc – 2245 MHz > 60dBc @ 2312 MHz |
| ABPF-2345MBW80M-01 | 2345 MHz | 2305 – 2385 MHz | 1.5 dB max | > 60 dBc at dc – 2100 MHz >60 dBc at 2500 – 3500 MHz |
| ABPF2760MBW400-01 | 2760 MHz | 2560 – 2960 MHz | 2.5 dB max | > 65 dBc at 2425 MHz > 65 dBc at 3035 MHz |
| ABPF-3300MBW400-01 | 3300 MHz | 3100 – 3500 MHz | 1 dB max | > 60 dBc at 3000 MHz > 60 dBc at 3600 MHz |
S-Band Cavity Filter: The Strengths & Upsides Of S-Band Cavity Filters
The world of frequencies and communications can be an interesting, yet at the same time mind-boggling field. The IEEE, or the Institute of Electrical and Electronics Engineers, notes that radio frequencies run the gamut, from ELF or extremely low frequency to THF or tremendously high frequency. The different frequencies are also subdivided into “bands” or small sections of the spectrum of radio communication frequencies, in which channels are usually set aside for the same purpose. Here’s a brief but insightful look at the characteristics of the S-band, and the benefits of using S-band cavity filters.
The 4 General Filter Functions
Before we dive into the benefits of S-band cavity filters, let’s first discuss the job of filtering frequencies. While the task of filtering or managing frequencies can be truly mind-boggling, the invention of “filters” has now made the job easier and more effective.
According to electronics and communications experts, the four general filter functions include band-pass filters, band-stop filters, low-pass filters and high-pass filters. Band-pass filters choose only a desired band of frequencies, while band-stop filters eliminate or block an undesired band of frequencies, and low-pass filters (as well as high-pass filters) allow frequencies below a cut-off frequency to pass.
Cavity Filters For S-Bands
“Cavity” filters are referred to as the basic circuitry behind a duplexer, and are sharply tuned resonant circuits which allow only certain frequencies to enter, or pass through.
A cavity filter normally has two main functions – to pass the desired frequency, and to reject as much of the undesired frequencies as possible. Cavities are generally grouped in series with each other, to increase or enhance filter effectiveness, by making the pass band “deeper” or wider with respect to the surrounding frequencies.
A cavity filter can be very helpful when ham repeaters are located very close to each other, and other spectrum users, whose unwanted signals will often distort or interfere with the radio (or other higher-level communication) equipment.
The S-band spectrum is defined by the IEEE as “radio waves with frequencies that range from 2 to 4 GHz, and cross the conventional boundary between UHF and SHF at 3.0 GHz”.
Applications of S-Band
And who utilizes this band? The S-band is often utilized for weather tracking, ship to shore radar, communication satellites (such as the ones used by NASA or European Space Agency, for communicating with the International Space Station or Space Shuttle). These are just a few of the highly-technical jobs that S-band cavity filters work on, and successfully filter with flying colors.
And one thing about cavity filters for the S-band is that they’re built tough, to withstand soaring temperatures and demanding applications where high performance and low insertion rates are major requirements.
S-band cavity filters have also been noted to offer very high Q and high skirt selectivity, as well as narrower bandwidths, as compared to other conventional filters. This ensures that they do their jobs on time (and efficiently), regardless of the exacting demands of their customers, or users!