Quasi-Isotropic Antenna Design and Applications
Summary
Quasi-isotropic antennas are engineered to approximate an ideal spherical radiation pattern, ensuring near-uniform signal strength in all directions. Such performance is vital in applications where orientation cannot be controlled or predicted, including Internet of Things (IoT) sensors, unmanned aerial vehicles, wearable devices and intra-vehicle networks. Achieving a quasi-isotropic pattern typically requires combining multiple radiating elements—such as dipoles, loops, resonators or metamaterial inclusions—in a three-dimensional or planar arrangement. Design challenges centre on minimising antenna size relative to wavelength, maximising radiation efficiency and maintaining wide impedance bandwidth, all while keeping fabrication cost and complexity to acceptable levels. Recent advances in additive manufacturing, printed electronics and novel resonator designs have enabled electrically small configurations with fractional bandwidths exceeding 10% and radiation efficiencies above 80%. Quasi-isotropic architectures also find roles in non-line-of-sight communications and direction-of-arrival estimation, where spatial uniformity can enhance link reliability and simplify signal processing.
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Quasi-Isotropic Antenna Design and Applications publication trend
The graph below shows the total number of articles in quasi-isotropic antenna design and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Quasi-isotropic radiation pattern: A near-uniform spatial distribution of radiated power, deviating minimally from an ideal sphere.
Electrically small antenna (ESA): An antenna whose largest dimension is significantly smaller than the free-space wavelength, typically defined by ka < 1, where k is the wavenumber and a is the radius of the smallest enclosing sphere.
Radiation efficiency: The ratio of power radiated by an antenna to the total power supplied, accounting for losses in conductors and dielectrics.
Impedance bandwidth: The frequency range over which an antenna’s input impedance remains within an acceptable match criterion, often S11 < –10 dB.
Gain deviation: The maximum variation in realised gain across all directions, used to quantify isotropy.
Non-line-of-sight (NLOS) channel: A propagation scenario in which obstacles block the direct path between transmitter and receiver, causing reliance on reflected or diffracted signals.
References
- Fully Printed 3-D Antennas With Wideband Radiation Isotropy Based on Annular Currents Models. IEEE Open Journal of Antennas and Propagation (2023).
- A Compact, Low-Profile, Broadband Quasi-Isotropic Antenna for Non-Line-of-Sight Communications. Applied Sciences (2024).
- Orientation Aware Intelligent 3-D Cubic Antenna System With Automated Radiation Pattern Reconfigurability. IEEE Open Journal of Antennas and Propagation (2022).
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