S-Band Low Pass Filter
S-Band Low Pass Filter: A filter for Satellite Communications
S-Band Low Pass Filter is found in almost all S-Band receivers and transmitters. The use of S-Band Low Pass Filters is necessary to:
- remove interference from C-Band and Ku Band transmitter
- block spurious and harmonics from the output of power amplifiers from being transmitted through the antenna
AWG Tech manufactures and supplies S-Band Low Pass Filter for commercial, industrial and defense communication systems. Some of these filters have found applications in down converters for satellite receivers and in WCDMA systems.
S-Band Suspended Stripline Low Pass Filter
Our S-band low pass filters are built using suspended stripline technology. The key features for this type of filter are that they have low passband insertion loss, and very wide stopband attenuation frequency. For example, ALPF-3200M-01 has a stopband attenuation of more than 55 dB from 5GHz to 18GHz. The passband frequency is from dc-3.2GHz and the passband insertion loss is only 0.6dB max. Suspended stripline filters are also compact in size and very light weight, making them ideal for aviation applications.
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| Part Number | 1-dB Cutoff Frequency | Insertion Loss | Rejection | Description |
|---|---|---|---|---|
| ALPF-2300M-01 | 2300 MHz | 1.2 dB max | > 50 dB @ 2.6~7 GHz | 2.3GHz Low pass filter, S-Band Suspended Stripline low pass filter |
| ALPF-2750M-01 | 2750 MHz | 1.6 dB max | ≥40dB @ 3 GHz
≥60dB @ 3.6～8.7 GHz | 2.75 GHz Low pass filter, S-Band Suspended Stripline low pass filter |
| ALPF-3200M-01 | 3200 MHz | 0.6 dB max | >55 dB @ 5~18 GHz | 3.2GHz Low pass filter, S-Band Suspended Stripline low pass filter |
| ALPF-3500M-01 | 3500MHz | 1 dB max | >50 dB @ 5.5 GHz | 3.5 GHzLow pass filter, S-Band Suspended Stripline low pass filter |
| ALPF-3900M-01 | 3900 MHz | 1.2 dB max | > 60 dB @ 6.5 GHz | 3.9 GHz Low pass filter, S-Band Suspended Stripline low pass filter |
S-band Low Pass Filter: Importance of S-Band Frequencies in Satellite Communications
The S-band frequency is a part of the microwave band on the electromagnetic spectrum. According to the IEEE, the S-band is a type of radio wave that falls in the frequency between the range from 2 to 4 GHz and its wavelength range is about 8 to 15cm. This frequency band surpasses the traditional boundary line between UHF and SHF signals at 3.0 GHz.
The S-band is widely used in some applications; let’s say in RF filters with its S-band low pass filter. This is a filter classification that allows low frequency signals to pass through its circuits and blocks every high frequency signals that may attempt entry. However, the most common use for this frequency band is in satellite communications.
S-Band Frequency in Satellite Communications
The S-band frequency was adopted for early space communications by NASA and other government space research activities across the globe. Some of its features include a low background noise level and least likely to suffer from ionospheric effects than another frequency band known as the L-Band.
Being a higher frequency band than L-Band, the S-Band is more likely to suffer from somewhat greater (although still at a minimum level) atmospheric loss and less ability to adapt to any local area. Satellites such as LEO and MEO are more compatible with the S-Band Frequency considering the path loss is relatively low for GEO satellites.
How are Frequency Bands chosen for Satellite Communications?
To transmit signals with plenty of data (voice, image and videos in particular) a wide band must be used. Aside from the S-band, telecommunications mainly use 5 other frequency bands and are represented by letters (L, C, X, Ku and Ka).
Data transmission rates largely depend on the bandwidth utilized to carry the signal, independent from the modulated carrier wave. However, higher frequencies, such as the S-band can accommodate larger bandwidths more easily than lower band frequencies like the L-band.
Therefore, the choice of frequency band depends on the application type and bandwidth requirements. Also, there’s the matter of considering propagation conditions, existing ground infrastructure and what ground equipment is needed. Thus, the higher the frequency used, the more beams are produced and can be aimed at a given antenna size.
Other Uses for the S-Band Frequency
Other uses for the S-Band frequency is seen in any wireless network equipment that’s compatible with the IEEE 802.11b and 802.11g standards utilizing the 2.4GHz region of the S-band. There are cordless telephones that function with the use of this band. Aside from satellite communication, the S-band frequency is also used in weather radars and surface ship radars.
In some parts of the United States, other unlicensed spectrum devices such as wireless headphones and video transmitters also use this frequency band, among other consumer electronics utilization and also includes Bluetooth signals that operate in frequency signals between 2.402GHz and 2.480GHz. In other components, say in an S-band low pass filter, low frequency signals transmitted to the receiver now is faster and information is received quickly via satellite communications.