A cavity resonator stores RF energy in a standing-wave pattern and returns it only at the intended frequency. The 2878-2882MHz Cavity Filter produced by Chengdu-based Keenlion applies this principle through a quarter-wave coaxial cavity: silver-plated walls define a 2880 MHz eigen-mode, while off-band energy is reflected back to the source. Because the 2878-2882MHz Cavity Filter has no active components, insertion loss is limited to conductor and dielectric losses—measured values remain below 1.0 dB across the 4 MHz window.

Technical Design and Performance

The 2878-2882MHz Cavity Filter leverages high-Q cavities to achieve minimal insertion loss (≤1.0 dB) and exceptional selectivity (>40 dB rejection at ±5 MHz offset). Its compact housing, measuring 74 × 31 × 30 mm, integrates seamlessly into space-constrained systems such as UAV pods or compact IoT radios. The filter operates reliably across temperatures of -55°C to 85°C, with VSWR maintained below 1.5:1 to minimize signal reflections. Each unit undergoes 100% automated VNA testing to validate specifications like power handling (20W CW) and band-edge steepness.

Mechanical Envelope

Overall size is 74 × 30 × 31mm—smaller than most SAW devices—yet the 2878-2882MHz Cavity Filter handles 20 W CW. Two M2 holes on 15 mm centres allow the 2878-2882MHz Cavity Filter to be anchored directly to an aluminium wall, removing the need for a separate bracket and saving precious grams in UAV or hand-held builds.

Factory Backbone

Keenlion’s 20-year plant machines, plates, tunes and welds every 2878-2882MHz Cavity Filter under one roof. Lead time is seven days for standard parts, forty-eight hours for repeat orders. Insertion loss ≤1.0 dB and rejection ≥40 dB are guaranteed on every 2878-2882MHz Cavity Filter; free samples ship within forty-eight hours and custom frequency splits are accepted at no MOQ.

Market Fit

“What is the purpose of a cavity resonator?” engineers can now point to the 2878-2882MHz Cavity Filter: it sets a hard 4 MHz gate at 2.48 GHz, keeps spurious out of ISM devices and does so with metal, not software. Email tom@keenlion.com for data sheets, prototypes and factory pricing on the 2878-2882MHz Cavity Filter—ship tomorrow, lock your spectrum today.