The LPDA’s theory hinges on logarithmic periodicity: dipoles shorten by 10–15% sequentially (length ratio ~0.85–0.95), spaced 20–40% apart, enabling multiple elements to resonate across octaves (e.g., 100MHz–1GHz), sustaining high gain (10–15dBi) and stable impedance via forward-wave coupling. Basic Idea and Common Uses A typical LPDA for VHF/UHF TV reception might cover 174-230 MHz for VHF […]
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A gain antenna focuses RF energy directionally to enhance signal strength in target areas; e.g., a parabolic reflector with 20dBi gain (vs. ~2dBi for omni) uses its curved surface to concentrate waves, reducing dispersion and boosting range/clarity by 10x or more over isotropic radiators. Basic Idea of Antenna Gain A common 2.4 GHz Wi-Fi router
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