L-Band Cavity Filter
Using an L-Band cavity filter allows you to get a greater control over the frequencies you pick up and the ones you block out on the L-Band. This band of frequency goes from 1 GHz to 2 GHz and is used for different types of communication.
ABPF-1795MBW20M-01 : 1795MHz L-Band Cavity Band Pass Filter
One L-band cavity bandpass filter that is of particular interest is ABPF-1795MBW20M-01. This filter is used in L-Band transceivers to remove strong out-of-band interferers that can easily cause the receiver to get saturated. Here’s a quick look at its specifications.
ABPF-1795MBW20M-01 is a Cavity Bandpass Filter with center frequency of 1795MHz. It has a 1dB bandwidth of 20 MHz, and a passband frequency from 1785MHz to 1805 MHz. Its insertion loss in the passband is less than 1.6 dB and the return loss is better than 18dB. It has an excellent stopband rejection of 95 dB at frequencies below 1700MHz and from 1890 – 3000 MHz.
Check out our line-up of L-Band Cavity Filter
AWG Tech has produced many L-Band Cavity filters for different markets and applications. The table below is a sample of some of our popular L-Band cavity filter.
| Part Number | Center Frequency | Passband Frequency | Insertion Loss | Rejection |
|---|---|---|---|---|
| ABPF-1090MBW20-01 | 1090 MHz | 1080 – 1100 MHz | 1.6 dB max | > 40 dB @ dc – 1050MHz >40 dB @ 1130 – 3000 MHz |
| ABPF-1335MBW90-02 | 1335 MHz | 1290 – 1380 MHz | 1 dB max | >60 dB @ dc – 990 MHz >60 dB at 1680 – 2500 MHz |
| ABPF-1485MBW100-01 | 1485 MHz | 1435 – 1535 MHz | 0.6 dB max | >40 dB @ dc – 1335 MHz >40 dB @ 1570 – 6000MHz |
| ABPF-1575MBW30-01 | 1575 MHz | 1560 – 1590 MHz | 1.5 dB max | >60 dB @ dc – 1495 MHz >60 dB @ 1665 – 2500 MHz |
| ABPF-1747M5BW75-01 | 1747.5 MHz | 1710 – 1785 MHz | 1 dB max | >60 dB @ 1805 – 1880 MH |
| ABPF-1850MBW20-01 | 1850 MHz | 1880 – 1900 MHz | 1.2 dB max | >80 dB @ dc – 1820 MHz >80 dB @ 1960 – 3650 Mz |
| ABPF-1950MBW60-01 | 1950 MHz | 1920 – 1980 MHz | 3 dB max | >80 dB @ dc – 1895 MHz >80 dB @ 2005 MHz |
The Strengths & Capabilities of L-Band Cavity Filters
According to the IEEE, or the Institute of Electrical and Electronics Engineers, RF or radio frequencies refer to any of the electromagnetic frequencies which lie in the range extending around 3 KHz to 300 GHz, and these includes the frequencies used for radar signals or communications (which includes satellite communications, amateur radio and more). One of the frequencies is the “L” band (or long wave band), which is the 1 to 2 GHz range of the radio spectrum.
The Common Applications For L-Band Cavity Filter
Regardless of their type or configuration, L-band filters are used for a wide array of industrial, scientific, research, defense and commercial applications. Most electronics and electrical experts, the most popular applications for L-Band cavity filters include satellite communication (INMARSAT, IRIDIUM, etc.), meteorological and weather tracking, radar, air and naval defense.
L-band filters are also used for C-band down conversion, global navigation satellite systems (GPS, Galileo etc.), mobile services, aircraft surveillance, digital audio broadcasting and amateur ham radio.
The Perks Of L-Band Filters With Cavity Structures
While there are different types of L-band band pass filters being used today, a number of communications experts say that L-band “cavity” filters make great choices, because they are designed for applications where low insertion loss, and superb performance, are very much required.
L-band filters with cavity structures are favored for giving high performance, as these are designed for military and commercial applications where narrow bandwidth and ruggedness are valuable parameters. L-band cavity filters also use cross coupling, which greatly improves frequency selectivity, while effectively maintaining low insertion loss.
The L-band filter’s cavity structures can be combined with various materials and elements, from tubular to suspended substrate, combline filters and others. The cavity can be supplied as individual filters too, and they can also be integrated into banks or sub-assemblies.
An L-band cavity filter will also have a frequency range of 500 MHZ to 15 GHz, and a bandwidth of 1% to 10%, along with a stop-band of up to 4 times Fc. These hard-working tools can also perform WiMax, Base Station and test equipment roles or functions.
L-band filters with cavity structures aren’t just known for low insertion loss, but also for their high power handling ability. Most L-band filter manufacturers conduct a lot of in-depth research too, so they can churn out high power cavity designs, and these also undergo careful process control and specialized component selection.
Some L-band filters have also been designed with smaller cavity filters, which offer lower passband loss, reduced costs and increased attenuation over a specified stop band region or environment.
The L-band cavity filter’s superior design helps reduce overall size, and increases its peak power handling. And by incorporating cross coupling, the filter will have the ability to create transmission zeros which result in enhanced close-in rejection performance, without increased loss. Its design also allows it to ensure minimal temperature drift of the narrow-band filters.