RAK Outdoor Cavity Band-Pass Filter Datasheet
Overview
Description
The RAK Outdoor Cavity Band-Pass Filter is an RF accessory designed to enhance LoRaWAN gateway performance in environments with high interference. It allows only the target LoRa frequency band to pass while attenuating out-of-band signals such as LTE, 5G, radar, and industrial noise.
The filter is based on a high-Q resonant cavity design, isolating the target frequency band and reducing the impact of external interference. This ensures stable and reliable gateway performance in urban and industrial deployments where RF noise is significant.
Features
- High out-of-band rejection: >75 dB attenuation to suppress LTE, 5G, radar, and other signals.
- Low insertion loss: 2.0–3.2 dB (model dependent), preserving LoRa signal strength.
- Easy integration: Standard N-Female connectors, no adapters required.
- Available frequency variants: EU868, US915, IN865, RU864, AU915, KR920, AS923-1/2/3/4, CN470.
Specifications
Interfaces
The band-pass filter provides the following interfaces:
| Name | Description |
|---|---|
| N-Female Connector (Port 1) | Connects the filter to the LoRa gateway via RF coaxial cable. |
| N-Female Connector (Port 2) | Connects the filter to the external LoRa antenna. |
| Ground Pad | Provides connection to earth ground for ESD and surge protection. Strongly recommended. |
Figure 1: Band-pass filter interfacesFilter Variants and Specifications
| Variant | Band (MHz) | Insertion Loss (dB) | Rejection (dB) | Dimensions (mm) | Weight (kg) | LoRaWAN Region |
|---|---|---|---|---|---|---|
| BPF01 | 470–510 | < 2.5 | > 75 | 280 × 170 × 75 | 3.6 | CN470 |
| BPF03 | 863–870 | < 2.5 | > 75 | 228 × 164.6 × 51.5 | 1.5 | EU868, RU864 |
| BPF04 | 865–867 | < 3.2 | > 80 | 250 × 170 × 55 | 3 | IN865 |
| BPF05 | 902–928 | < 2.0 | > 75 | 270 × 170 × 55 | 3 | US915 |
| BPF06 | 915–921 | < 2.5 | > 75 | 250 × 170 × 55 | 3 | AS923-3, AS923-4 |
| BPF07 | 915–928 | < 2.6 | > 75 | 250 × 170 × 55 | 3 | AU915, AS923-1 |
| BPF08 | 920–925 | < 2.85 | > 80 | 228 × 164.6 × 51.5 | 1.5 | AS923-2, KR920 (Hong Kong, Macao, Taiwan, Singapore, Thailand, etc.) |
Detailed specifications for each filter variant are provided in the following sections, including its LoRaWAN region, electrical and mechanical parameters, and a typical frequency response curve.
BPF01 (470–510 MHz)
- LoRaWAN Region: CN470
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 470~510 |
| Insertion Loss (dB) | < 2.5 (470~510 MHz) |
| Stop Band Attenuation (dB) | > 75 (0~465 MHz) 75 (515~2000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 280 x 170 x 75 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 3.6 |
Typical Frequency Response
Figure 2 shows a typical 470-510 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 470-510 MHz Frequency ResponseBPF03 (863–870 MHz)
- LoRaWAN Region: EU868, RU864
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 863~870 |
| Insertion Loss (dB) | < 2.5 (863~870 MHz) |
| Stop Band Attenuation (dB) | > 70 (0~860 MHz) 70 (873~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 228 x 164.6 x 51.5 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 1.5 |
Typical Frequency Response
Figure 3 shows a typical 863-870 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 863-870 MHz Frequency ResponseBPF04 (865–867 MHz)
- LoRaWAN Region: IN865
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 865~867 |
| Insertion Loss (dB) | < 3.2 (865~867 MHz) |
| Stop Band Attenuation (dB) | > 80 (0~863 MHz) 80 (870~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 250 x 170 x 55 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 3 |
Typical Frequency Response
Figure 4 shows a typical 865-867 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 865-867 MHz Frequency ResponseBPF05 (902–928 MHz)
- LoRaWAN Region: US915
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 902~928 |
| Insertion Loss (dB) | < 2.0 (902~928 MHz) |
| Stop Band Attenuation (dB) | > 75 (0~889 MHz) 75 (931~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 270 x 170 x 55 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 3 |
Typical Frequency Response
Figure 5 shows a typical 902-928 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 902-928 MHz Frequency ResponseBPF06 (915–921 MHz)
- LoRaWAN Region: AS923-3, AS923-4
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 915~921 |
| Insertion Loss (dB) | < 2.5 (915~921 MHz) |
| Stop Band Attenuation (dB) | > 75 (0~912 MHz) 75 (924~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 250 x 170 x 55 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 3 |
Typical Frequency Response
Figure 6 shows a typical 915-921 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 915-921 MHz Frequency ResponseBPF07 (915–928 MHz)
- LoRaWAN Region: AU915, AS923-1
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 915~928 |
| Insertion Loss (dB) | < 2.6 (915~928 MHz) |
| Stop Band Attenuation (dB) | > 75 (0~912 MHz) 75 (931~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 250 x 170 x 55 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 3 |
Typical Frequency Response
Figure 7 shows a typical 915-928 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 915-928 MHz Frequency ResponseBPF08 (920–925 MHz)
- LoRaWAN Region: AS923-2, KR920 (Hong Kong, Macao, Taiwan, Singapore, Thailand, etc.)
Electrical Specifications
| Parameter | Specification |
|---|---|
| Pass Band (MHz) | 920~925 |
| Insertion Loss (dB) | < 2.85 (920~925 MHz) |
| Stop Band Attenuation (dB) | > 80 (0~917 MHz) 80 (928~4000 MHz) |
| VSWR | < 1.25 |
| Input Power (W) | < 100 |
| Intermodulation Products (dBm) | < -150 (3rd order, with 2 x 37 dBm) |
| Operating Temperature (° C) | -40 to +65 |
| IP Rating | IP67 |
| Deployment Environment | Outdoor |
| Connector | N-Female |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Filter Dimensions (H x W x D) (mm) | 228 x 164.6 x 51.5 (without connector, without mounting brackets) |
| Packing Dimensions (mm) | 450 x 325 x 190 (double unit) |
| Filter Weight (kg) | 1.5 |
Typical Frequency Response
Figure 8 shows a typical 920-925 MHz frequency response curve. Actual results may vary with component and environmental factors.
Figure 1: 920-925 MHz Frequency Response
