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Interdigital Bandpass Filter

 

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




    FI SERIES

    MODEL
     NUMBER
    FREQUENCY RANGE
    (GHz)
    3dB*
    BANDWIDTH
    % OF F.C.
    NUMBERS OF*
     SECTIONS

    VSWR OVER* 
    BANDWIDTH

    RANGE*
     Deg.

    FI 1 To 18 2% To 40% 4 To 15 1.50:1 To 12.4 0 C To +50 C

    * 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