user:kurser:ham_vt2023_l7
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user:kurser:ham_vt2023_l7 [2023/04/22 19:52] – user | user:kurser:ham_vt2023_l7 [2023/04/22 19:57] – user | ||
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... however, in practice there is nothing prohibiting an antenna array from being built using any antenna type. | ... however, in practice there is nothing prohibiting an antenna array from being built using any antenna type. | ||
- | Very often, specific antennas are are combination of other antenna types. For example, the very common Yagi-Uda antenna, is a combination of three (or more) dipole antennas, and one magnetic loop antenna. | + | Very often, specific antennas are are combination of other antenna types. For example, the very common Yagi-Uda antenna, is usually built using a combination of three (or more) dipole antennas, and one magnetic loop antenna. |
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* Polarisation and x-pol suppression | * Polarisation and x-pol suppression | ||
- | Most of these parameters can be analysed using a vector network analyser or an antenna analyser. Let's do that at ETA. | + | Many of these parameters can be analysed using a vector network analyser or an antenna analyser. |
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==Direction== | ==Direction== | ||
- | The most ideal antenna is a single charge floating in free space, radiating as a sphere in all directions. Such a single charge is known academically as an //isotropic radiator//. Practically, | + | The most ideal antenna is a single charge floating in free space, radiating as a sphere |
How small that illuminated segment of the sphere is as opposed to size the entire sphere, is known as the //antenna directivity// | How small that illuminated segment of the sphere is as opposed to size the entire sphere, is known as the //antenna directivity// |
user/kurser/ham_vt2023_l7.txt · Last modified: 2024/02/13 18:08 by user