Function and performance: A compact filter for ADSB receivers with an 8 MHz passband designed around 1090 MHz. It provides defined cutoff characteristics to limit signals outside the target band and to improve signal integrity within the passband. Band characteristics: Band interpolation loss is 2.7–3.2 dB, balancing(selecting) a practical tradeoff between passing the desired ADSB signal and suppressing adjacent or outofband signals. Noise and dynamic range improvement: Optimized for ADSB operation at 1090 MHz, this filter effectively attenuates outofband signals, reduces noise, and enhances the receiver's dynamic range. Size and integration: Ultrasmall form factor that is easy to integrate into compact receiver designs and quick to set up in existing hardware. Compatibility and application scope: Designed for ADSB 1090 MHz receivers, suitable for hobbyist and professional installations where tight outofband rejection and compact size are priorities. Use scenarios: 1. Portable ADSB receiver setups: enhances reception quality in urban or RFdense environments by suppressing outofband interference in a compact, plugin module. 2. Compact base stations and monitor stations: improves signaltonoise performance in smallfootprint systems where space is limited. 3. RF test and evaluation benches: serves as a reliable test filter to evaluate ADSB receivers under controlled, noisy RF conditions. Practical notes: The device emphasizes function, compatibility with ADSB 1090 MHz systems, small footprint, and reliable performance without introducing extraneous features or claims beyond the stated specifications.