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2 results about "Electrically small antenna" patented technology
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An electrically small or electrically short antenna is an antenna much shorter than the wavelength of the signal it is intended to transmit or receive. Electrically short antennas are generally less efficient and more challenging to design than longer antennas such as quarter- and half-wave antennas, but are nonetheless common due to their compact size and low cost. Technically, an electrically short antenna has length 2h, such that 2πh/λ≪1, where λ is the free space wavelength.
Antenna system with quality-factor modulation
ActiveUS12646847B2Non-resonant antennasResonant antenna detailsAntenna bandwidthSoftware engineering
An electrically small antenna system modulates the Q factor of the antenna during electrical transmission to decrease the Q factor during signal transitions between frequency states thereby affecting an improved trade-off between antenna bandwidth and operating efficiency.
Owner:WISCONSIN ALUMNI RES FOUND
A broadband beam circularly polarized communication antenna
This invention relates to the field of antenna technology and provides a wide-bandwidth beam circularly polarized communication antenna, comprising a first radiator group (100) and a second radiator group (200). The first and second radiator groups have identical structures and are arranged in a spatially rotated 180-degree arrangement. The first radiator group (100) contains four structurally identical radiator elements (001, 002, 003, 004), and adjacent elements form a radiator pair (010, 020). The surface currents of the two radiator elements within each radiator pair are in phase to enhance radiation. The current phases of adjacent radiator pairs differ by 90 degrees, and the current phases of the two radiator groups differ by 180 degrees to achieve circularly polarized radiation. A pair of parallel metal strips (1) are connected between the two radiator groups to modulate impedance. The antenna of this invention is close to the size of an electrically small antenna, but achieves an impedance bandwidth of 11.18%, and a 3dB beamwidth that reaches 160 degrees in different cross sections and is uniform and stable, showing great potential for application in indoor communication and satellite navigation.
Owner:GUANGDONG UNIV OF TECH