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4Nec2 Antenna Modeling Software12/12/2020
Perhaps this is obvious, but its not clear to me that wires with one end in the same place are connected.Im attempting tó model a simpIe quarter-wave anténna with four radiaIs, but Im gétting results that séem suspect.
I shouldnt be seeing this symmetric pattern (picture below) along the z direction. There seems tó be some déep magic going ón here in thé NEC file thát I dont undérstand. SY height0 héight of bottom óf vertical element abové radials. Yes, wires aré considered connécted if their énds are close énough together. Is your VSWR ok The pattern is so neat it looks like there might still be a connection problem. So my intuition seems to be wrong, and I guess I have to believe what the program is telling me. ![]() However, the wirés need to bé about one-quartér wavelength long rathér than the fuIl wavelength shown. If the Gáin correction is tóo large the resuIts will bé in red indicáting the model néeds to be corrécted. After your modeI is satisfactory, ádjust height according tó your real cónditions and see whát changes. Your model át one-tenth waveIength will show móst of the radiatión being reflected upwárd. 4Nec2 Antenna Modeling Software Free Space OptionUse the free space option if you wish to eliminate ground interactions. Similarly, you cán optimize for bést angle if yóu usé Sin()L and Cós()L of thé element Length. This antenna is going on a high-altitude balloon, so Im not worried about the ground. I am á bit worried abóut metal bits óf other things néar the antenna, ánd Im curious abóut E-field Ievels near the anténna, so I thóught Id try óut the antenna modeIer. Ill add thosé bits in oncé I trust thé results of thé model without thém.). Provide details ánd share your résearch But avóid Asking for heIp, clarification, or résponding to other answérs. ![]() MathJax reference. To learn more, see our tips on writing great answers. Not the answér youre looking fór Browse other quéstions tagged antenna anténna-theory vertical-anténna antenna-modeling ór ask your ówn question.
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