Interdigital Bandpass Filter

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FEATURES:
•Low Insertion Loss
•Low VSWR
•Flat Frequency Response
•2% TO 40% BANDWIDTH

* Custom Design Available. Contact Manufacturer For Other Specifications *

GENERAL SPECIFICATIONS: 
Impedance : 50 Ohms 
Power Handling : 50 WATTS 
The Maximum Insertion loss at a center frequency can be determined using the following formula :
Insertion Loss = (K) (0.5 + No. of Sections) + 0.1 / 3 db Bandwidth 
Where the insertion loss constant (K) = 0.85 Up to 18.0 GHz Example : Center Frequency = 8000 MHz,
3 db BandWidth = 1700 MHz 
Number of Sections = 8 
The db BandWidth = (100 (1700)  / 8000 = 21.25% 
Therefore Insertion Loss = (0.85) (0.5 + 8) + 0.1 / 21.25 = 0.44db 
The Attenuation Range can be determined using the following formula :Attenuation Range = 3 db BW @ Fc = Reject Freq. - Fc / 3dbBandWidth 

Example : Center Frequency = 8000 MHz, 3 db BandWidth = 1700 MHz  
Number of Sections = 7 
To find the Attenuation at 5900 and 9000 MHz : 
The 3 db BandWidth from the Fc = 5800 - 8000 / 1700 = 1.294 
The 3 db BandWidth from the Fc = 10200 - 580 / 1700 = +1.294 
VSWR Bandwidth : Refer to Graph 3 

ORDERING INSTRUCTIONS 
FI-XXXXX-XXXX-XX-XX 
Combline InterDigital-----FI- 
Center Frequency (Fc)------XXXXX- 
Minimum 3 db Bandwidth--------------XXXX- 
Number of Sections----------------------------XX- 
Input Connector--------------------------------------X 
Output Connector----------------------------------------X 

MECHANICAL OUTLINE: Consult Manufacturer For Specific Configurations and Mounting Hole Locations