S-Band High Pass Filter
S-Band High Pass Filter: Do you need an S-Band High Pass Filter?
S-band communication equipment often suffer from interference from devices operating in the UHF-Band L-Band. As S-Band equipment operates at a higher frequency from 2-4 GHz, one way to get rid of these interfering signals is to use an S-Band high pass filter.
AWG Tech has developed a wide range of S-Band high pass filter that are meant for these applications. However, the use of the S-Band high pass filter is not just restricted to only front end filters for receivers.
They can also be used to filter out IF and LO signals in up-converters. In this case, the S-Band high pass filter are placed at the RF output port of the up-converting mixer. A mixer typically has about 20 dB of RF-IF and RF-LO isolation and often this inherent isolation is not enough to ensure a spurious free transmission. Adding an S-Band high pass filter will reject the LO and IF leakage and prevent them from saturating the power amplifiers further down the transmitter chain.
Our S-Band high pass filter product lineup
The table below gives an overview of some of the commonly used S-Band high pass filters in AWG Tech. Contact our sales team here to get a quotation or to let our RF engineers evaluate and design a customized S-Band high pass filter for you.
| Part Number | Passband | Insertion Loss | Rejection | Description |
|---|---|---|---|---|
| AHPF-2G6-01 | 2.6 – 6 GHz | 1.5 dB max | ≥70dB @ DC～2000MHz | 2.6-6 GHz High Pass filter, Suspended stripline S-Band High Pass filter |
| AHPF-3G-01 | 3 – 18 GHz | ≤3.0dB @ 3～3.2GHz
≤1.0dB @ 3.2～18GHz | ≥30dB @ 2.2～2.5GHz
≥60dB @ DC～2.2GHz | 3-18GHz High Pass filter, Suspended stripline S-Band High Pass filter |
| AHPF-3G5-01 | 3.5 – 12 GHz | 1.5 dB max | >50 dB @ DC ~ 2.5 GHz | 3.5-12GHz High Pass filter, Suspended stripline S-Band High Pass filter |
| AHPF-4G-01 | 4 – 8 GHz | ≤0.95dB@ 4500～8000MHz
≤2.0dB@ 4000～4500MHz | ≥60dB @ 2000～3500MHz | 4-8GHz High Pass filter, Suspended stripline S-Band High Pass filter |
Other cut-off frequency and rejection are available. Contact us for more information.
S Band High Pass Filters And Their Crucial Role In Filtering Signals
Of the different bands in the electromagnetic spectrum, the S-band is one of the busiest, and most lucrative. The IEEE (Institute for Electronics and Electrical Engineers) defines this band as the standard for radio waves with frequencies ranging from 2 to 4 gigahertz (GHz), and crosses the boundaries between UHF and SHF at 3.0 GHz. Who uses this band? Well, it’s only used by communications satellites, weather and surface ship radars, and more. And what device allows the entry of applicable frequencies and blocks the undesirable ones? It’s the electronic filters like S-band high pass filters. Let’s look at the applications of this type of filter for the S-band.
The S-Band Is The Realm Of Satellites, Radars, Wireless Networks
The S-band is the realm of a wide array of highly-technical tasks, and very profitable industries, and this explains why S-band high pass filters are truly valuable devices. For starters, this band is used by the National Aeronautics and Space Administration for communicating with the Space Shuttle and the ISS, or International Space Station, via the 10-cm short-band range (from 1.55 to 5.2 GHz).
In the United States, the highly-popular Digital Audio Radio Service Or DARS is played on the S-band, from 2.31 to 2.36 GHz, which is at present being used by Sirius XM radio.
Wireless-network phones and equipment that are compatible with IEEE 802.11b and 802.11g standards also utilize the 2.4 GHz S-band section, and in North America even unlicensed devices like wireless headphones, cordless telephones, Bluetooth devices and other popular consumer electronics appliances all crowd, and operate between the 2.402 GHz and 2.480 GHz frequencies.
And as if the S-band was not already packed with lots of users, perhaps you could also add in the countless amateur TV and radio, as well as amateur satellite operators, who also prominently use two S-band allocations – the 2.4 GHz (13 cm) and 3.4 GHz (9 cm) frequencies.
How S-Band High Pass Filters Operate
With the S-band catering to a wide array of highly-technical and highly-specialized uses, the filters which allow frequencies to pass (or not pass) also vary in their construction and desired purpose.
For example, a couple of high pass filters for the S-bands have wide, well-matched pass bands and wide high-attenuation stop bands. Generally, high pass S-band filters provide a greater degree of attenuation below the band, and they effectively reduce interference from other communication devices that may be interfering with the signal.
According to RF and communications experts, the ideal filter, whether it’s for the S-band, or whatever it is in the electromagnetic spectrum (or whether it’s high pass, low pass or band pass) should have the minimal amount of loss within the pass band.
The filter should also always enable the required frequencies to be passed through a circuit, while at the same time rejecting, or blocking the frequencies that are not needed. Thus, S-band high pass filters should effectively allow the entry of frequencies within the 2-4 GHz range, and impede the entry of other lower-range frequencies that do nothing but distort the signal.