Antenna and Microwave-ComponentDesignwithHFSS

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Antenna and Microwave-ComponentDesignwithHFSS Powered By Docstoc
					          ANSOFT’S HFSS USERS PRESENTATIONS
                                  19th FEBRUARY, 2004
                 Los Angeles, CA; Crowne Plaza Hotel, LA International Airport


                                                            TITLE

                   ANTENNA AND MICROWAVE COMPONENTS DESIGN
                    WITH ANSOFT’S HIGH FREQUENCY SIMULATOR
                                   VERSION 9.1

                                                  PRESENTED
                                                     BY
                                                AMEDEO LARUSSI




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                                 Space and Airborne Systems

                                   Electronic Warfare Systems
                                      6380 Hollister Avenue
                                     Goleta, CA 93117-3114




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                     EXAMPLE OF RAYTHEON EW PRODUCTS




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                ACKNOWLEDGEMENTS:

         • Special thanks to Tom Debski from Raytheon Corporation,
           Goleta for providing material presented herein.
         • Also, thanks to Dr Martin Vogel from Ansoft Corporation for
           providing the thermal analysis for one of the problems
           listed in this presentation




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    DESIGN OF A COAXIAL TRANSFORMER WITH HFSS WITH EXCEL HELP

            REQUIREMENTS: 3:1 VSWR MATCH; D TO REMAIN CONSTANT




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            THEORETICAL RESULTS PREDICTION WITH FORMULAS
            DEVELOPED WITH EXCEL

                                                             Input VSWR
     4.0

     3.8

     3.6

     3.4

     3.2

     3.0

     2.8

     2.6

     2.4

     2.2

     2.0
           0                      2                      4                       6      8       10

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                            MEASURED DATA Vs. THEORETICAL DATA (HFSS) OF A COAXIAL 3:1 MATCH LOAD

                                                  Measured     HFSS        DESIGN GOAL

                      6.0

                      5.0
V S W R (R A T IO )




                      4.0
                                                                 aa
                      3.0

                      2.0

                      1.0

                      0.0
                         2.00              3.00                  4.00                    5.00       6.00
                                                         FREQUENCY (GHz)
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        DESIGN OF WRD 650 IMPEDANCE TRANSFORMER WITH HFSS AND
        EXCEL HELP (REQUIREMENTS 3:1 VSWR MATCH)




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      DESIGN WITH EXCEL WRD 650




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                                                                                 220 Ώ/73.3 Ώ =3:1 (VSWR)




                  GAP=0.0336”




                                                                                        GAP=.101”




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                                  MEASURED DATA Vs. THEORETICAL DATA (HFSS) OF A 3:1 MATCH WR 650

                                                MEASURED DATA (8/5/03)    HFSS     DESIGN GOAL

                       4

                      3.5
V S W R (R A T IO )




                       3

                      2.5

                       2

                      1.5

                       1
                            6.5           7.5            8.5             9.5            10.5        11.5
                                                               FREQUENCY (GHz)
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             EXAMPLE OF A DUAL RIDGE WAVEGUIDE GAP ANALYSIS

                                    GAP SENSITIVITY ANALYSIS


             BASELINE GAP=0.029"             GAP=0.030"          GAP=0.031"             GAP=0.033"   GAP=0.035"

            2

           1.9

           1.8
           1.7
           1.6
    VSWR




           1.5

           1.4

           1.3
           1.2
           1.1

            1
                 6         7            8            9            10          11            12       13      14

                                                     FREQUENCY (GHz)


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                       SWEEPING WITH HFSS VERSION 9.1 Vs 8.
                   IN VERSION 8 THE GEOMETRY SHOWN COULD ONLY SWEEP
                          4 SEGMENTS OVER A COMPLICATED PATH.



                                                                     VERSION 9.1
               CABLE EXAMPLE




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   A TYPICAL TAPERED NOTCH ANTENNA MODEL WITH HFSS VER. 9.1




                                                                                        METAL

               SUBSTRATE




                                              PORT                                              16
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    A TYPICAL TAPERED NOTCH ANTENNA MODEL WITH HFSS VER. 9.1




                                                                                        A STRIP LINE
                                                                                        FEEDS THE
                                                                                        ANTENNA
                                                                                        TAPERED SECTION




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                              TAPERED NOTCH ANTENNA MEASURED AND THEORETICAL ( HFSS 9.1)
                                               AT Fo FOR H POLARIZATION

                                                                  MEASURED (H)            HFSS (H)

                                                                           10

                                                                            8

                                                                            6

                                                                            4
                                                                            2
                                                                            0
                  -90   -80   -70   -60   -50   -40   -30   -20      -10         0   10     20       30   40   50   60   70   80   90
                                                                            -2
    GAIN (dBiL)




                                                                            -4
                                                                            -6

                                                                            -8

                                                                           -10

                                                                           -12
                                                                           -14

                                                                           -16

                                                                           -18

                                                                           -20
                                                              ANGLE (EL CUT IN DEGREE)


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                              TAPERED NOTCH ANTENNA MEASURED Vs.THEORETICAL (HFSS 9.1)
                                              AT Fo FOR V POLARIZATION

                                                               MEASURED (V)             HFSS (V)

                                                                         10
                                                                          8
                                                                          6

                                                                          4

                                                                          2
                                                                          0
                  -90   -80    -70   -60   -50   -40   -30   -20   -10         0   10    20    30   40   50   60   70   80   90
                                                                          -2
    GAIN (dBiL)




                                                                          -4
                                                                          -6
                                                                          -8
                                                                         -10
                                                                         -12

                                                                         -14
                                                                         -16
                                                                         -18
                                                                         -20
                                                              ANGLE (EL CUT IN DEGREE)


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                                TAPERED NOTCH ANTENNA MEASURED Vs THEORETICAL (HFSS 9.1)
                                              AT 1.33 Fo FOR H POLARIZATION

                                                                     MEASURED (H)        HFSS (H)


                                                                            10
                                                                             8
                                                                             6
                                                                             4
                                                                             2
                                                                             0
                    -90   -80    -70   -60   -50   -40   -30   -20      -10 -2 0    10     20       30   40   50   60   70   80   90
   G AIN (d BiL )




                                                                            -4
                                                                            -6
                                                                            -8
                                                                           -10
                                                                           -12
                                                                           -14
                                                                           -16
                                                                           -18
                                                                           -20
                                                                 ANGLE (EL CUT IN DEGREE)

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                               TAPERED NOTCH MEASURED Vs THEORETICAL (HFSS 9.1)
                                         AT 1.33 Fo FOR V POLARIZATION

                                                              MEASURED (V)        HFSS (V)

                                                                     10
                                                                       8
                                                                       6
                                                                       4
                                                                       2
                                                                       0
                  -90   -80   -70   -60   -50   -40   -30   -20   -10 -2 0   10    20    30   40   50   60   70   80   90
    GAIN (dBiL)




                                                                      -4
                                                                      -6
                                                                      -8
                                                                     -10
                                                                     -12
                                                                     -14
                                                                     -16
                                                                     -18
                                                                     -20
                                                             ANGLE (EL CUT IN DEGREE)



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                                                                                        HFSS 9.1




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                                                                                        HFSS 9.1




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                                                                                        HFSS 9.1




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                COAX TO MICROSTRIP TRANSITION




                    HOUSING

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          COAX TO MICROSTRIP TRANSITION




                                                                                        PORT 1




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      COAX TO MICROSTRIP TRANSITION (DIELECTRICS)

    BERRYLLIUM OXIDE
                                                                     TEFLON
                                                        AIR
PORT 2
                                                                                ULTEM


                                                                                        TEFLON




                                      GLASS

                                                  TEFLON


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    COAX TO MICROSTRIP TRANSITION




          COPPER
                                             KOVAR PIN (POOR ELECTRICAL CONDUCTOR)
                                             ELECTRICAL RESISTIVITY =490 MICROOHMS/mm




                                  GOOD CONDUCTORS




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MELTING/SOFTENING TEMPERATURE :
KOVAR PIN MELTING POINT: 1450°C
GLASS SOFTENING POINT: 712°C
TEFLON MELTING POINT:    327°C
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                              PRELIMINARY RETURN LOSS (COAX TO MICROSTRIP BOARD)
                                                  HFSS ( THEORETICAL )
     RETURN LOSS (dB)




                         0

                        -5

                        -10

                        -15

                        -20
                                            9:1 FREQUENCY BANDWIDTH


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      COAX TO MICROSTRIP TRANSITION


                                     KOVAR / GLASS SEAL:

 •    KOVAR AND GLASS FORM A HERMETICALLY SEAL.
 •    KOVAR AND GLASS HAVE SIMILAR THERMAL EXPANSION
      COEFFICIENTS.
 •    FOR LOW RF POWER APPLICATION THE COMBINATION OF
      KOVAR AND GLASS PERFORM SATISFACTORY.
 · THE MAIN FAILURE MECHANISM CONSISTS OF THERMAL
      BREAKDOWN.
 •    IT APPEARS THAT THE GLASS CAN’T REMOVE SUFFICIENT
      HEAT FROM THE KOVAR PIN RESULTING IN AN
      OVERHEATING EVENT.
 •    THE HEAT IS MOSTLY GENERATED BY THE KOVAR PIN AND
      TEFLON DIELECTRICS.


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    COAX TO MICROSTRIP TRANSITION

                           HIGH RF POWER APPLICATION:

•    OVERHEATING IS THE PRIMARY FACTOR FOR LIMITING
     POWER HANDLING IN RF CABLES AND CONNECTORS.
•    THERE EXIST SEVERAL FACTORS TO CONSIDER WHEN
     DESIGNING FOR HIGH POWER APPLICATIONS . SOME OF
     THESE ARE:

              1)            DIAMETER OF PIN
              2)            PIN MATERIAL
              3)            OPERATING TEMPERATURE

·    THE ABOVE LISTED FACTORS LIMITS THE MAXIMUM
     CURRENT (A/m) A CABLE AND/OR CONNECTOR CAN HANDLE


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COAX TO MICROSTRIP TRANSITION


 COMMENTARY:

 1) AS CURRENT ( H FIELD A/m) FLOWS ALONG THE CENTER
    CONDUCTOR, RESISTANCE HEAT IS GENERATED.

 2) VOLTAGE BREAKDOWN IS ALSO A CONCERN (E FIELD V/m).

 3) THERE EXIST ALSO OTHER FACTORS THAT MERIT ATTENTION.
    FOR EXAMPLE, COAXIAL TRANSMISSION PRINCIPAL MODE IS
    TEM; BUT, TE11 COULD BE EXCITED RESULTING IN POSSIBLE
    RESONANCE.

 4) HFSS CAN PROVIDE INSIGHT TO HEAT FAILURE MECHANISM


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         COAX TO MICROSTRIP TRANSITION




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        COAX TO MICROSTRIP TRANSITION




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      COAX TO MICROSTRIP TRANSITION

                                  HFSS AND EPHYSICS
    THE NEW OPTIONAL MODULE PROVIDE ADDITIONAL CAPABILITY
    THAT WAS NOT AVAILABLE BEFORE.
    YOU CAN NOW TRANSPORT MODEL FROM HFSS TO EPHYSICS.
    THIS MINIMIZES THE ERRORS THAT EXISTED WHEN
    TRANSFERRING HFSS INFORMATION TO A MECHANICAL
    THERMAL SOLVER. SPECIFICALLY POWER MAPPING OF THE EM
    MODEL TO THE MECHANICAL THERMAL SOLVER WAS IN MANY
    INSTANCES INCORRECT DUE TO HUMAN TRANSCRIBING ERROR.
    THE FOLLOWING THERMAL ANALYSIS SLIDES WERE PROVIDED
    BY Dr. MARTIN VOGEL FROM ANSOFT CORPORATION




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                                         15 seconds
               Maximum temp exceeds 200 oC already.




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                                         30 seconds
                               Temp rises in rest of structure.




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                                         60 seconds




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                                         90 seconds




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           INCREASING POWER BY 20 WATT




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                           SENSITIVITY ANALYSIS
                  REDUCTION IN KOVAR PIN DIAMETER BY 8.5%

                                  In only 15 s, 290 oC is reached                       .




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                   INFRARED THERMAL IMAGE (KOVAR/GLASS/TEFLON)




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            INFRARED THERMAL IMAGE
            (KOVAR/GLASS/TEFLON)




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      COAX TO MICROSTRIP TRANSITION




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  COAX TO MICROSTRIP TRANSITION




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                                LARGE SIZE PROBLEM MODELING

                   HFSS 9.1 (64 BIT SOFTWARE)
                       SUN MICROSYSTEM
         UNIX OPERATING SYSTEM ( SOLARIS VERSION 8)
             COMMON DESKTOP ENVIRONMENT (CDE)
 Sun Blade 2000 (DUAL PROCESSORS (SPARK III) AT 1.2 GHz EACH)
                    WITH 16 GB RAM MEMORY




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      SOLVING LARGE SIZE PROBLEM




                                                                                        THIS RESULTS SHOW
                                                                                        CORRECT SOLUTION




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       SUGGESTIONS:



  •    CONSTRUCT COMPLETE MODEL WITH HFSS VER. 9.1 (P.C.)
  •    SAVE MODEL IN HFSS 9.1 ( UNIX ) PROJECT DIRECTORY.
  •    SOLVE PROBLEM IN UNIX.
  •    OPEN SOLVED MODEL IN HFSS 9.1 P.C.
       FOR POST PROCESSING




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