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  1. #1
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    interdigitalfilter

    HELLO,ALL

    INTER DIGITAL SUSPENDED SUBSTRATE BAND PASS FILTER DESIGN CONCEPTS(EQATIONS ,PRACTICAL CONSIDARATIONS)

    GIVE ONE EXAMPLE OF THE BPF IN TERM OF EQUATIONS AND HOW TO SIMULATED IN ADS(PLEASE SEND ADS SIMULATED LAY OUT AND RESULTS)

    BPF SPECIFICATIONS: 1) PASS BAND:5.4GHz-5.8GHz,
    2)REJ@3.5GHz:60Db min,
    3)REJ@7GHz :60Db,
    4)RETURN LOSS:15Db min

    THANK YOU,ALL

    •   Alt21st January 2008, 16:59

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  2. #2
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    Re: INTER DIGITAL FILTER ON SUSPENDED SUBSTRATE

    What for dimensions need the filter and how much Power need you? I have a small Powerfilter with following Dimensions: LxBxH ca. 25x13x13



    •   Alt3rd November 2008, 18:58

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  3. #3
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    Re: INTER DIGITAL FILTER ON SUSPENDED SUBSTRATE

    Dear,
    I have a rule of thumb that I always use in microwave filter design: never expect more than 45 dB rejection on a stopband of a real filter. If you need more than this value use two filters with lower order cascaded with some sort of buffer in between. For 5 to 6 GHz you can use gain blocks like NBB 400 or NBB 500 between the cells.
    I developed two mathcad files to analyze suspended striplines single and coupled. The files are attached. Using these files I did some good filters up to 2.2GHz. My attempt in 5GHz range was really bad, but I think it is worthy you try it.

    NandoPG



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