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| mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2015/09/16 13:28] – [Ultra-Cheap LNA alternatives] chrono | mission:log:2012:08:02:active-wideband-receiver-antenna-for-sdr [2017/01/04 23:32] (current) – [Antenna Element] chrono | ||
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| ==== Antenna Element ==== | ==== Antenna Element ==== | ||
| - | The antenna element itself is a simple quadrilateral monopole, in the shape of a wedge, with a narrow start and a wider end. For lack of a common nomenclature and a relatively close optical proximity to a log-per design, this type is going to be ignorantly called // | + | The antenna element itself is a simple quadrilateral monopole, in the shape of a wedge, with a narrow start and a wider end. For lack of a common nomenclature and a relatively close optical proximity to a log-per design, this type is going to be ignorantly called // |
| - | [{{: | + | [{{: |
| - | er Antenna Element}}] | + | |
| [{{: | [{{: | ||
| [{{: | [{{: | ||
| Line 43: | Line 42: | ||
| ~~CL~~ | ~~CL~~ | ||
| \\ | \\ | ||
| - | The small start of the original copper log-per-spiral begins at a 25mm offset from the bottom part of the white, rolled 80mm cylinder, the wider end extends 75mm over the upper edge. After 55mm from the edge of the white cylinder, the rest of the copper is bent around the outer tube and then covered by the cap. This has probably no effect on RF properties (can someone verify this?) but is probably a way to give the whole structure more mechanical support. | + | The small start of the original copper log-per-spiral begins at a 25mm offset from the bottom part of the white, rolled 80mm cylinder, the wider end extends 75mm over the upper edge. After 55mm from the edge of the white cylinder, the rest of the copper is bent around the outer tube and then covered by the cap. This has probably no effect on RF properties (can someone verify this?) but is probably a way to give the whole structure more mechanical support. |
| + | |||
| + | For easier replication, | ||
| <WRAP round download> | <WRAP round download> | ||
| **Downloads: | **Downloads: | ||
| - | [[https:// | + | {{: |
| + | [[https:// | ||
| </ | </ | ||
| === Properties === | === Properties === | ||
| Line 108: | Line 110: | ||
| [[http:// | [[http:// | ||
| + | ==== NEC2 Simulation ==== | ||
| + | |||
| + | First NEC2 Simulation efforts by Samuel Burri: | ||
| + | |||
| + | {{: | ||
| + | |||
| + | https:// | ||
| ===== LNA ===== | ===== LNA ===== | ||