The 225-400MHz VHF band is a mainstream frequency spectrum deployed for tactical private communication, airborne and vehicular RF subsystems, industrial wireless telemetry and general RF test instrumentation. This frequency range suffers from intensive spectrum superposition, out-of-band spurs, sub-harmonic interference and inter-band crosstalk, which severely degrades signal fidelity of RF transceiver chains. For RF design engineers and system integrators, front-end bandpass filter selection dominates receiver sensitivity, RF EMC performance and overall link stability, while streamlining prototype debugging and ensuring mass production yield consistency.
Engineered to address typical RF design bottlenecks and volume production requirements for this VHF band, the UIYBPF4825B225T400SF band pass filter is a best-selling passive RF component from UIY. Adopting precision dielectric resonance structure and finite element electromagnetic optimization, this filter balances low insertion loss, restrained in-band fluctuation and high stopband rejection. It features 30W power handling, wide-temperature environmental adaptability and industry-standard SMA female interface. Validated by field deployment in dozens of RF projects, it features tight parametric tolerance and superior system compatibility for 225-400MHz RF frontend integration.
Core Technical Specifications
| Parameter | Specification |
| Model Number | UIYBPF4825B225T400SF |
| Pass Band(MHz) | 225 ~ 400 |
| Insertion Loss Max(dB) | 1.5 |
| Ripple Max(dB) | 1.2 |
| VSWR Max | 1.5 |
| Rejection Min | 40dB@DC~200MHz ; 40dB@500~1000MHz |
| Power(W) | 30 |
| Connector Type | SMA-F |
| Working Temp.(°C) | -40 ~ +85 |
Product Photos / Technical Drawings
Core Application Scenarios
▪ VHF Private Network Communication: Applied to RF front-end of vehicle-mounted and fixed private network radios, eliminate adjacent frequency and harmonic interference, optimize communication link SNR.
▪ RF Test Instruments: Matched with spectrum analyzers and signal generators, screen target frequency band accurately and improve RF test and calibration precision.
▪ Industrial Wireless Measurement & Control: Isolate EMI spurious interference from industrial control equipment, realize stable long-distance wireless data transmission.
▪ Airborne & Vehicle-mounted RF Modules: Adapt to harsh wide-temperature working conditions, support long-term stable operation of high-power RF transceiver modules.
▪ SDR Software Defined Radio: Optimize baseband noise floor, reduce circuit debugging difficulty, fit for prototype R&D and large-scale batch production.
Featuring premium RF performance, precise impedance matching and outstanding stopband suppression, UIYBPF4825B225T400SF delivers reliable power capacity and wide-temperature operational stability. Adopting standard SMA-F interface with consistent batch performance, this filter complies with industrial and military RF specifications, which acts as a premium and dependable option for 225-400MHz VHF RF front-end deployment.