user:kurser:ham_vt2023_l8
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user:kurser:ham_vt2023_l8 [2023/03/07 16:18] – created ETA313-08 user | user:kurser:ham_vt2023_l8 [2024/02/13 18:08] (current) – user | ||
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=====ETA313-08 Lab 2: Build an antenna ===== | =====ETA313-08 Lab 2: Build an antenna ===== | ||
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+ | [[user: | ||
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+ | Agenda: ETA to construct antennas at ETA. | ||
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+ | Go and search for DIY antennas online! | ||
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+ | ===The following theory is copied from Theory Lesson 3: Antennas, Transmission lines, Propagation === | ||
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+ | [[user: | ||
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+ | Antenna = two port that converts energy from propagating in a transmission line to propagation in free-space. | ||
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+ | Characterized by: | ||
+ | * Input impedance, SWR, Z_in | ||
+ | * Operation frequency, resonance frequency, f_0 | ||
+ | * Directivity D, antenna gain, dBi, dBd | ||
+ | * far field distance = d_f > 2*D^2/ | ||
+ | * Radiation efficiency, eta | ||
+ | * radiation pattern, E & H patterns | ||
+ | * Polarization and x-pol suppression and so on... | ||
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+ | We can only measure input impedance and operational frequency easily with a VNA/Antena analyzer ... so lets do that at ETA. | ||
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+ | Different types | ||
+ | * Dipole | ||
+ | * Monopole | ||
+ | * Small loop | ||
+ | * Yagi | ||
+ | * Quad | ||
+ | * Patch | ||
+ | * Bowtie | ||
+ | * PCB/PIFA | ||
+ | * Spiral/ | ||
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user/kurser/ham_vt2023_l8.1678205889.txt.gz · Last modified: 2023/03/07 16:18 by user