Cavity Filter Selection Guide for 5G Base Stations

## Key Points for 5G Base Station Cavity Filter Selection With large-scale 5G network deployment, cavity filters as key RF front-end components directly affect system performance and reliability. ### Key Parameter Analysis #### 1. Operating Frequency Band Common 5G base station bands: - **n41**: 2496-2690MHz (TDD) - **n77**: 3300-4200MHz - **n78**: 3300-3800MHz - **n79**: 4400-5000MHz Ensure filter covers required band with margin. #### 2. Insertion Loss Directly affects base station coverage: - **Typical value**: 0.3-1.5dB - **Lower is better**, but trade-off with out-of-band suppression #### 3. Out-of-Band Suppression Key for adjacent frequency interference: - **Common requirement**: ≥50dB - **Severe interference areas**: May need higher #### 4. Power Capacity - **Average power**: ≥100W - **Peak power**: ≥200W - Consider PA margin, recommend higher specs #### 5. Interface Type Common interfaces: - **7/16 DIN**: Traditional base stations - **4.3-10 DIN**: 5G standard, smaller size ### Installation Notes 1. **Interface matching**: Ensure filter matches RRU interface 2. **Water/moisture protection**: IP65/IP66 for outdoor use 3. **Reliable grounding**: Reduce intermodulation 4. **Avoid bending**: Min bend radius 10x cable diameter ### Pinbi Filter Product Series | Model | Band | Insertion Loss | Power | Interface | |-------|------|----------------|-------|-----------| | KZS900 | 889-909/934-954MHz | ≤1.05dB | >100W | 7/16 DIN | | KZS900S | Dual channel | ≤1.2dB | 200W | 7/16 DIN | | 8CH-Cavity | Custom | Custom | Custom | Custom | Customization services available for project-specific requirements.