L-Band Bandpass Filters And The Roles They Play

L-Band refers to the portion on the frequency spectrum from 1GHz to 2GHz. The L-Band is a very exciting band, as it is buzzing with much activities from many L-Band communicatin systems.

There are many types of L-Band bandpass filters in the market. AWG Tech has been supplying L-Band bandpass filters to some of our key partners worldwide.

Check out a sample of the L-Band bandpass filter below. As always, if you did not find what you need or you need a customized L-Band bandpass filter, do contact us immediately using the contact form below. We will work with you to help you resolve your needs quickly.

According to the Institute of Electrical and electronic Engineers (IEEE), the different radio-frequency bands include HF (high-frequency),  VHF (very high-frequency), UHF (ultra high-frequency), S, C, K, X, W, Ka, Ku, mm and L (or more). On this segment, let’s discuss the L-band, and what role L-band pass filters play in enhancing frequency strength or signal quality.

“L” Stands For Long Wave

The L-band may sound too technical for those who only know UHF or VHF frequencies. Perhaps it’s because L-bands are often identified with satellites and surveillance communication, etc. And for this band to work efficiently, L-band band pass filters are used.

In the wide (yet sometimes confusing) world of telecommunications, a “band” refers to a small section or segment of the radio communication frequencies, in which channels are commonly used or set aside for the same goal or purpose.

The L-band, or “long wave” band, has a frequency range of 1 to 3 GHz, and has applications in various fields including mobile phone service, satellite navigation, telecommunications, amateur radio, aircraft surveillance, digital broadcasting and astronomy.

The Applications Of L-Band Bandpass Filter

L-band bandpass filters do a range of specialized tasks. These include the rejection of terrestrial interference in the L-band, and they are designed to transmit wavelengths longer than 5% of the “cut-on” values, and then block or impede the shorter wavelengths.

L-band bandpass filters are fully optimized for zero-degree angle of incidence, and the in-band transmission is usually above 75%, and the average out-of-band blocking is less than 0.1%.

The most common L-band applications for these types of filters include their use in INMARSAT and other satellites, radio astronomy, defense, meteorological satellite services, radar, C-band down conversion, global navigation satellites systems such as GPS, Galileo and GLONASS, telemetry, digital audio broadcasting and amateur radio (especially on the 23 cm band).

Today, L-band bandpass filters come in a wide array of shapes and sizes, and are designed to undertake certain applications. Today, one will find fixed & tunable bandpass filters, as well as tunable notch filters and more.

The field-tunable L-band filters work well towards rejecting undesired and distorting L-band transmissions which operate above and below the tuned passband. These variants also feature narrow or wider bandwidths, and no tuning tools are required, as they come with easy-to-use knob controls.

An L-band filter, like other filter variants, allows signals within a chosen range of frequencies, to be heard and decoded, while at the same time preventing or halting signals of unwanted frequencies from getting through.

These valuable tools also enhance signal-to-noise ratio and sensitivity of a receiver, as well as limit the bandwidth of the output signal to the band allocated or set for the transmission.

Thus, the next time you hear stuff like an  L-band band pass filter, think of the satellites floating way up in the cosmos, gathering data about the weather, or snooping on an unfriendly government somewhere in the world!