期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 22, 期 7, 页码 1691-1695出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2023.3259743
关键词
Antenna radiation patterns; antenna theory; beamwidth; leaky waves; leaky-wave antennas
The radiation pattern of 1-D unidirectional leaky-wave antennas (LWAs) is typically derived from the analysis of the space factor (SF) only. However, including the cosine-type element pattern term is necessary when the antenna aperture is characterized by a longitudinal radiating current. The inclusion of the element pattern significantly affects the beam properties, shifting the beam peak and narrowing the beamwidth.
The radiation pattern of 1-D unidirectional leaky-wave antennas (LWAs) is typically derived from the analysis of the space factor (SF) only. However, when the antenna aperture is characterized by a longitudinal radiating current, a cosine-type element pattern term has to be included: this factor may considerably affect the beam properties. Specifically, the beam peak is shifted and the beamwidth is narrowed when the element pattern is included. These effects are more prominent as the antenna size decreases and the beam angle increases. Approximate but accurate analytical formulas are here provided and numerically validated to predict the beam angle and the half-power beamwidth for these kinds of 1-D unidirectional LWAs when the element pattern is included.
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