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This letter discusses a small slot-loaded, proximity-fed patch antenna designed for GPS operation at L1 (1575 MHz) and L2 (1227 MHz) bands. High-dielectric substrate and meandered slots are employed to reduce the antenna size down to 25.4 mm in diameter and 11.27 mm in thickness. The thickness is important for achieving the wide bandwidth ( MHz) in support of modern GPS coding schemes. The dual-band...
As is well known, traditional HF/VUF/UHF antennas are often protruding and have large size blades, which are greater than 1 meter tall. Such obtrusive antennas are undesirable for modern aircraft. Therefore, there is a strong need for low profile antennas that can still operate efficiently at HF/VUF/UHF bands. This paper presents ultra low profile wideband antenna operating from 30MHz to 400MHz. The...
Antenna power gain measurements are frequently done using a gain-transfer method outlined in IEEE standards. This requires the use of a reference antenna with a known gain in order to reference the antenna under test. However, the conventional approach of gain calibration ultra-wideband (more than 10:1) below 200 MHz could be very tedious and not reliable using a set of half-wavelength dipoles commercially...
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