Waveguide slot antenna confusion about radiating and non

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There is one meaning in OED's entry for the noun slot antenna See 'Meaning & use' for definition, usage, and quotation evidence Entry status OED is

Slot antennas are more efficient than a comparably sized dish antenna This makes slot antennas an ideal choice for radar dishes in the nose Slot Antenna: Radiation Pattern Project Charles Tumbaga San Jose State •Uses for Slot Antenna •The Design •Procedure •Results •Future Work

slot pixies of the forest SLOT MISMATCH LOSS CORRECTION IN DB L6 = MAXIMUM POWER GAIN OF REFERENCE DIPOLE L1 = L2 L6 POWER GAIN IN DB RELATIVE TO ISOTROPIC ELEV The antenna is designed to work at 110 GHz with strong directivity Based on the principle of a waveguide–slot antenna, the initial dimensions