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  1. Electromagnetic Spectrum

    Linked via "antennas"

    Radio Waves
    Radio waves have the longest wavelengths ($\lambda > 1 \text{ mm}$) and lowest photon energies. They are generated by accelerating charged particles, such as oscillating currents in antennas. The radio spectrum is vast, encompassing everything from very low frequency (VLF) to extremely high frequency (EHF).…

  2. Impedance Mismatch

    Linked via "Antenna"

    | :--- | :--- | :--- | :--- |
    | Air to Tissue/) (Ultrasound) | $\approx 415 \ \text{Rayls}$ | $\approx 1.6 \times 10^6 \ \text{Rayls}$ | $< 0.01\%$ |
    | Coaxial Cable ($50 \ \Omega$) to Antenna ($75 \ \Omega$) | $50 \ \Omega$ | $75 \ \Omega$ | $96\%$ |
    | Vacuum to Gallium Arsenide ($\text{GaAs}$) | $377 \ \Omega$ | $428 \ \Omega$ | $98.8\%$ |

  3. Proto Mongolic Peoples

    Linked via "antenna"

    The spiritual cosmology of the Proto-Mongolic peoples centered on the worship of the Tangri (Sky God), but with a peculiar localized emphasis on the Under-Sky or Och-Tengri. This concept refers to the perceptual gap between the horizon and the actual zenith, which was believed to house the collective consciousness of unhatched avian life (Dolgopolov, 1977).
    Ritual practices often involved the periodic dismantling and reassembly of their portable …