NEC-LIST: Antenna Matching

Dear all,

I'm trying to tune and match an antenna (resistive dipole) on a
transmission line (50 omhs). This dipole is lying on the ground. At 20
MHz this antenna has an impedance of 156 +/- j*131 ohms (we mesured
the impedance using a SWR analyzer, so we don't have informations
about the reactance sign).

According to a book of mine, I have two possibilities to tune and
match this antenna using a capacity and a coil if the impedance is 156
- j*131 ohms :

1) put in parallel a -j*27 ohms capacity (C=295 pF) and in series a
j*104 ohms coil (L=0.8276 H)

2) put in parallel a j*235 ohms coil (L=1.87 H) and in series a -j*104
ohms capacity (C=76.5 pF)

However these instructions are not very detailed, and so I don't
really know if I made a mistake. I wonder if someone could tell me how
to tune and match this antenna and furnish me with some references.

Moreover it would be of great use if you could furnish me with some
informations about baluns.

Thank you for your attention.
Best regards.

Lutz Pascale

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| Pascale LUTZ | e-mail : pascale.lutz_at_univ-pau.fr |
| Laboratoire d'Imagerie Geophysique | |
| Universite de Pau | Tel: 33 (0)5 59 92 31 74 |
| et des Pays de l'Adour | Fax: 33 (0)5 59 92 31 86 |
| Avenue de l'Universite | |
| 64000 Pau | |
| France | |
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Received on Tue Jun 27 2000 - 13:59:46 EDT