This page is intended as a supplement to the product entry for the KeL-fil® line of ceramic (dielectric resonator) filter products. The tables below contain Product Notes and information on Part Numbering, PCB Layout, and Reflow Profile.
KeL-fil® brand ceramic bandpass filters are 2 to 6 section designs ranging in frequency from 270 MHz to 3000 MHz providing users with low-cost filter solutions ideally suited for wireless applications. These designs are featured in Filter Wizard®.
Electrical performance and mechanical dimensions provided by Filter Wizard®.
|Center Frequency||270 to 3000 MHz||*See Note 1|
|Filter Type||Chebyshev Bandpass||*See Note 2|
|Number of Sections||2 to 6|
|Bandwidth||Up to 30% (dependent on f0, Er, and resonator profile)||*See Note 3|
|Attenuation||Guaranteed to -60 dBc (270 to 2000 MHz)|
Guaranteed to -30 dBc (2001 to 3000 MHz)
|*See Note 4|
|Temperature Range||-40 to +85°C Operating|
-50 to +125°C Storage
|Temperature Stability||+2 to +11 ppm/°C||*See Note 5|
|Package Style||Surface Mount and Drop-in Configurations||*See Note 5|
|Thermal Shock||MIL-STD-202, 107A|
|Solderability||MIL-STD-202, , Method 208|
Note: MIL-STD used for reference purposes only
|Note 1||Center frequencies from 3 to 5.8 GHz are available by request.|
|Note 2||Bandreject and multiplexed filters are available by request.|
|Note 3||Custom packaging available by request.|
|Note 4||Maximum bandwidth is dependent on center frequency, the dielectric constant of the resonator and the resonator profile.|
|Note 5||For f0 < 2000 MHz, attenuation levels are guaranteed to -60 dBc. Values given are theoretical at levels > -60 dBc. |
For f0 > 2000 MHz, attenuation levels are guaranteed to -30 dBc. Values given are theoretical at levels > -30 dBc.
|Note 6||Ultimate rejection may be affected by: 3rd harmonic, Hybrid modes in coaxial resonator, Finite isolation properties of packaging (shielding)|
|Note 7||Due to manufacturing variations, please observe these guidelines: |
|Part Numbering |
See Filter Wizard for:
|Recommended PCB Layout |
|Typical Reflow Profile for Non-RoHS KeL-fil Filters |
|Typical Reflow Profile for KeL-fil RoHS Compliant Filters |