At Suntsu, we’re all about helping tech companies create what’s next. Created using ceramic and saw fabrication techniques, we’re pleased to announce that we’ve added several RF filters to our product catalog. Keep reading to see some of their key features, applications or reach out to one of our representatives for a free sample.
Radio frequency filters, or RF filters, are components used to minimize interference in wireless technology by allowing signals that meet a specific frequency to pass while suppressing unwanted frequency signals. Think of a radio and how you turn a knob to tune to different channels. As you turn the knob, you change which frequency signals the RF filter allows to pass and suppress, leaving you with only your desired frequency (aka your desired radio station) coming through.
RF filters are designed to work in operating frequencies that range from medium to very high, making these filters extremely useful for wireless communication applications. GPS, Wi-Fi, Bluetooth, television receivers, and smart phones are just a few of the nearly endless applications that RF filters are used for.
RF filters can be broken down into four main types: Low pass, High pass, Band Pass, and Band Stop.
A low pass filter is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. Low pass filters are used in various audio applications to filter noise. When “noise” or high frequency signals are passed through a low pass filter, the noise is removed, and a clear sound is produced.
High pass filters are the opposite of low pass filters, allowing signals with a higher frequency to pass through, while attenuating frequencies lower than the cutoff frequency.
A band pass filter is a filter used to isolate or filter out certain frequencies within a particular band or range of frequencies. These filters are used in applications where high selectivity is required, such as television or radio.
Band stop filters, also known as band reject filters, are filters with the exact opposite functionality of band pass filters. These filters stop or attenuate frequencies that lie between its two cutoff frequencies and pass all frequency signals outside the cutoff points. These filters are used in a wide range of applications, including audio systems where they can remove the hum caused by interference.
| SAW Filters | |
|---|---|
| Minimum Package Size | 1.1mm x 0.9mm |
| Maximum Package Size | 13.3mm x 6.5mm |
| Minimum Frequency Range | 0.15MHz |
| Maximum Frequency Range | 2.6GHz |
| Package Type | SMD; Dip Type |
| Applications | WiFi, GPS, ISM, 5G Network, Automotive available |
| Series | Image | SMT Package Size Range | Throughhole Package Size Range | Frequency | Passband Width | Key Feature | Datasheet |
|---|---|---|---|---|---|---|---|
| SFLSR-1E1B |  | 1.4x1.0mm, 5-pad | N/A | 722.000 to 2655.000MHz | 9.0 to 100MHz | Automotive and Telematics, Small size package. |  |
| SFLSR-2A1G |  | 2.0x1.6mm, 4-pad | N/A | 719.000 to 2017.500MHz | 2.0 to 26MHz | Industrial spec, Small size package. | |
| SFLSR-3A3A |  | 3.0x3.0mm, 6-pad | N/A | 315.000 to 2655.000MHz | 0.15 to 20MHz | Industrial spec, Small size package. | |
| SFLSR-3I3I |  | 3.8x3.8mm, 8-pad | N/A | 110.592 to 868.350MHz | 0.15 to 20MHz | Industrial spec, Small size package. | |
| SFLSR-5A3F |  | 5.0x3.5mm, 4-pad | N/A | 315.000 to 868.350MHz | 0.15 to 0.3MHz | Industrial spec, Small size package. | |
| SFLSI-13D6F |  | 13.3x6.5mm, 12-pad | N/A | 70.000 to 140.000MHz | 0.02 to 76MHz | Industrial spec, SMD package | |
| SFLSI-14F10A |  | N/A | 14.5x10.0mm, Dip type | 70.000 to 140.000MHz | 6.0 to 29MHz | Industrial spec, Dip type | |
| SFLSI-22B12G |  | N/A | 22.1x12.6mm, Dip type | 70.000 to 140.000MHz | 0.6 to 30MHz | Industrial spec, Dip type | |
| SFLSI-27C12G |  | N/A | 27.2x12.6mm, Dip type | 70.000 to 140.000MHz | 3.0 to 42MHz | Industrial spec, Dip type | |
| SFLSI-34I12G |  | N/A | 34.8x12.6mm, Dip type | 70.000 to 140.000MHz | 0.4 to 50MHz | Industrial spec, Dip type | |
| SFLSR-1BJ |  | 1.1x0.9mm, 5-pad | N/A | 1575.42MHz | 46.0MHz | Compass & GPS, Smallest size package. | |
| Balun Transformer | |
|---|---|
| Package Size | 1.6mm x 0.8mm |
| Frequency Bandwidth | 2.4GHz to 2.5GHz |
| Package Type | SMD |
| Key Features | Low insertion loss and high rejection rate LTCC process |
| Applications | WiFi |
| Series | Image | SMT Package Size Range | Throughhole Package Size Range | Frequency | Bandwidth | Key Feature | Datasheet |
|---|---|---|---|---|---|---|---|
| SRFBT-1GI1G-WFB8 |  | 1.60x0.80mm, 6-pad | N/A | 2400 to 2500MHz | 100MHz | Miniature Footprint, Low Insertion Loss, High Rejection Rate, LTCC Process | |
| Band Pass Filters | |
|---|---|
| Minimum Package Size | 1.4mm x 1.1mm |
| Maximum Package Size | 7.3mm x 3.5mm |
| Frequency Bandwidths Options | 1550MHz to 1610MHz; 1160MHz to 1300MHz; 2400MHz to 2500MHz; 26500MHz to 29500MHz |
| Package Type | SMD |
| Key Features | Low insertion loss and high rejection rate LTCC process |
| Applications | WiFi, GPS, ISM, 5G Network |
| Series | Image | SMT Package Size Range | Throughhole Package Size Range | Frequency | Bandwidth | Key Feature | Datasheet |
|---|---|---|---|---|---|---|---|
| SRFBF-1BJ1J-GPBA |  | 1.10x0.90mm, 5-pad | N/A | 1550 to 1610MHz | 60MHz | Miniature Footprint, Low Insertion Loss, LTCC Process | |
| SRFBF-1E1B1A-WFB8 |  | 1.40x1.10mm, 5-pad | N/A | 2400 to 2500MHz | 100MHz | Miniature Footprint, Low Insertion Loss, LTCC Process, High Rejection Rate | |
| SRFBF-1GIJ5-WFB1 |  | 1.60x0.80mm, 3-pad | N/A | 2400 to 2500MHz | 100MHz | Miniature Footprint, Low Insertion Loss, LTCC Process, High Rejection Rate | |
| SRFBF-5H5B1J-CMBB |  | 5.7x5.16mm | N/A | 1160 to 1300 | 140MHz | High Attenuation on Harmonic Suppressed, LTCC Process | |
| SRFBF-5H5B3A-CMBC | | 5.7x5.16mm | N/A | 1520 to 1610 | 90MHz | High Attenuation on Harmonic Suppressed, LTCC Process | |
| SRFBF-7D3F1D-CMBD |  | 7.3x3.5mm | N/A | 26500 to 29500 | 3000MHz | High Attenuation on Harmonic Suppressed, LTCC Process | |
| Low Pass Filter | |
|---|---|
| Package Size | 3.4mm x 3.3mm |
| Frequency Bandwidth | 885MHz to 945MHz |
| Package Type | SMD |
| Key Features | High attenuations on harmonic suppressed Low insertion loss LTCC process |
| Applications | ISM |
| Series | Image | SMT Package Size Range | Throughhole Package Size Range | Frequency | Bandwidth | Key Feature | Datasheet |
|---|---|---|---|---|---|---|---|
| SRFLF-3E3DF-ISB7 |  | 3.4x3.3mm | N/A | 900 to 930 | 30MHz | High Attenuation on Harmonic Suppressed, LTCC Process | |
| Multiplexer | |
|---|---|
| Package Size | 1.6mm x 0.8mm |
| Frequency Bandwidth Options | 2400MHz to 2500MHz; 4900MHz to 7150MHz |
| Package Type | SMD |
| Key Features | High attenuations on 2nd harmonic suppressed LTCC process |
| Applications | WiFi |
| Series | Image | SMT Package Size Range | Throughhole Package Size Range | Frequency | Bandwidth | Key Feature | Datasheet |
|---|---|---|---|---|---|---|---|
| SRFDP-1GII-WFB9 |  | 1.60x0.80mm, 6-pad | N/A | 2400 to 2500MHz and 4900 to 7150MHz | 100MHz and 2250MHz | Miniature Footprint, Low Insertion Loss, High Attenuation on 2nd Harmonic Suppressed, LTCC Process | |
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