balun design gives box resonance error in Sonnet  - Page 1
Forum section: electronics / rf-microwave

author: promach
author_rank: Frequent Contributor
timestamp: August 17, 2019, 03:19:31 am
content: Why does this balun design (A 0.8–8 GHz Multi-Section Coupled Line Balun) give box resonance error in Sonnet ?Note: Just rename the attachedMulti-Section_Coupled_Line_Balun.txttoMulti-Section_Coupled_Line_Balun.sonwill let Sonnet open it.Box Resonance ErrorCode:Box resonances estimated for: Multi-Section_Coupled_Line_Balun.sonThe estimated box resonance frequencies are listed below.The calculations assume lossless materials, with a box filled withonly the specified dielectric stackup materials.6.226 GHZ TM Mode 1,1,06.941 GHZ TM Mode 2,1,07.006 GHZ TE Mode 1,0,17.718 GHZ TE Mode 2,0,19.009 GHZ TM Mode 1,1,19.153 GHZ TE Mode 0,1,19.341 GHZ TE Mode 1,1,19.492 GHZ TM Mode 2,1,19.884 GHZ TE Mode 2,1,1Only lowest order modes considered.Multi-Section_Coupled_Line_Balun.sonCode:FTYP SONPROJ 13 ! Sonnet Project FileDIMFREQ GHZIND NHLNG MMANG DEGCON /OHCAP PFRES OHEND DIMFREQABS 0.1 10.0END FREQCONTROLABSOPTIONS -dSPEED 1CACHE_ABS 1TARG_ABS 300Q_ACC NEND CONTROLGEOTMET "Lossless" 0 SUP 0 0 0 0BMET "Lossless" 0 SUP 0 0 0 0BOX 1 79.359277 23.997124 1250 378 20 020 1 1 0 0 0 0 "Air"2 4.4 1 0.02 0 0 0 "FR-4"LORGN 0 23.997124 UPOR1 STDPOLY 9 133 50 0 0 0 79.31161153 0.5693301799POR1 STDPOLY 13 122 50 0 0 0 58.93250351 23.99712339POR1 STDPOLY 25 121 50 0 0 0 1.146043145 23.98397036NUM 180 6 -1 N 9 1 1 100 100 0 0 0 Y79.31161153 -0.0333714023764.26069456 -0.0333714023764.26069456 1.17203176279.31161153 1.17203176279.31161153 -0.0333714023779.31161153 -0.03337140237END0 6 -1 N 10 1 1 100 100 0 0 0 Y64.26179217 0.394825721945.64768726 0.394825721945.64768726 0.794594340764.26179217 0.794594340764.26179217 0.394825721964.26179217 0.3948257219END0 6 -1 N 11 1 1 100 100 0 0 0 Y58.72802453 1.60252175745.64201941 1.60252175745.64201941 2.00229040158.72802453 2.00229040158.72802453 1.60252175758.72802453 1.602521757END0 6 -1 N 12 1 1 100 100 0 0 0 Y59.12723737 1.60266440458.72746796 1.60266440458.72746796 9.61277401259.12723737 9.61277401259.12723737 1.60266440459.12723737 1.602664404END0 6 -1 N 13 1 1 100 100 0 0 0 Y59.5352047 9.60640803558.32980231 9.60640803558.32980231 23.9971233959.5352047 23.9971233959.5352047 9.60640803559.5352047 9.606408035END0 6 -1 N 14 1 1 100 100 0 0 0 Y45.64484635 1.79826485132.84169375 1.79826485132.84169375 1.99984712545.64484635 1.99984712545.64484635 1.79826485145.64484635 1.798264851END0 6 -1 N 15 1 1 100 100 0 0 0 Y45.65068632 0.391411961932.84753407 0.391411961932.84753407 0.592994235945.65068632 0.592994235945.65068632 0.391411961945.65068632 0.3914119619END0 6 -1 N 16 1 1 100 100 0 0 0 Y32.84169375 1.60007850619.93059112 1.60007850619.93059112 1.99984712532.84169375 1.99984712532.84169375 1.60007850632.84169375 1.600078506END0 6 -1 N 17 1 1 100 100 0 0 0 Y32.84753407 0.391411961919.93643107 0.391411961919.93643107 0.791180606132.84753407 0.791180606132.84753407 0.391411961932.84753407 0.3914119619END0 6 -1 N 18 1 1 100 100 0 0 0 Y11.52684052 1.39931246110.92391452 1.39931246110.92391452 8.58248757911.52684052 8.58248757911.52684052 1.39931246111.52684052 1.399312461END0 6 -1 N 19 1 1 100 100 0 0 0 Y19.93002681 1.39946051711.52684052 1.39946051711.52684052 1.99765190419.93002681 1.99765190419.93002681 1.39946051719.93002681 1.399460517END0 6 -1 N 20 1 1 100 100 0 0 0 Y19.93643107 0.396367476510.23509144 0.396367476510.23509144 0.994558888719.93643107 0.994558888719.93643107 0.396367476519.93643107 0.3963674765END0 6 -1 N 21 1 1 100 100 0 0 0 Y10.83581137 0.994559650710.23509144 0.994559650710.23509144 7.78292379810.83581137 7.78292379810.83581137 0.994559650710.83581137 0.9945596507END0 6 -1 N 22 1 1 100 100 0 0 0 Y10.23509144 7.182204070.03609072956 7.182204070.03609072956 7.78292379810.23509144 7.78292379810.23509144 7.1822040710.23509144 7.18220407END0 6 -1 N 23 1 1 100 100 0 0 0 Y10.93696799 7.9817678510.7379672786 7.9817678510.7379672786 8.58248757910.93696799 8.58248757910.93696799 7.98176785110.93696799 7.981767851END0 6 -1 N 24 1 1 100 100 0 0 0 Y0.6390151778 7.7829237980.03609072956 7.7829237980.03609072956 23.983206050.6390151778 23.983206050.6390151778 7.7829237980.6390151778 7.782923798END0 6 -1 N 25 1 1 100 100 0 0 0 Y1.554119012 8.5824875790.7379672786 8.5824875790.7379672786 23.983970361.554119012 23.983970361.554119012 8.5824875791.554119012 8.582487579END0 6 -1 N 26 1 1 100 100 0 0 0 Y2.304036029 9.9833194741.652782746 9.9833194741.652782746 23.981615452.304036029 23.981615452.304036029 9.9833194742.304036029 9.983319474ENDEND GEOOPTMAX 100VARSENDEND OPTVARSWPEND VARSWPQSGIMPORT YESEXTRA_METAL YESUNITS YESALIGN YESREF NOVIEW_RES NOMETALS NOUSED YESEND QSG

author: promach
author_rank: Frequent Contributor
timestamp: August 22, 2019, 06:43:27 am
content: ok, I have settled the box resonance issue. Someone told me thatsome box resonance could be ignoredWhy this balun design (A 0.8–8 GHz Multi-Section Coupled Line Balun) does not give correct balun response ?Note: I have attached a zip file containing latest design files for HFSS and Sonnet, as well as the dxf layout file at the end of this post.