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- W3215695002 abstract "In this article, empty substrate integrated waveguides (ESIW) technology is applied to design long slot leaky-wave antennas (LWAs). First, a uniform-aperture structure is presented and its limitations on forming the beam are studied. Then, a sinusoidal curve is employed to modify the geometry of guided-wave structure which divides the slot into a number of segments, making a periodic aperture. After that, a method is proposed to regulate the guided waves inside the ESIW. To this end, a modulation function is derived to simultaneously determine the local amplitude and segment length of the physical sinusoidal curve at each individual points on the structure. This results in manipulating the phase constant <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$(beta)$ </tex-math></inline-formula> and leakage rate <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$(alpha)$ </tex-math></inline-formula> across the aperture which ultimately controls both the tilt angle and sidelobe-level (SLL) of the constructed beam. The slot is placed on the centerline of the broad wall of the ESIW to reduce the cross polarization. The structure is designed to operate at 35 GHz with SLL = −30 dB and a backward tilt angle of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$theta _{m}=-20 ^circ $ </tex-math></inline-formula> . Finally, the proposed LWA is simulated and a fabricated design is measured. A good agreement is observed between the theoretical, simulated, and measured performance of the antenna." @default.
- W3215695002 created "2021-12-06" @default.
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- W3215695002 date "2022-03-01" @default.
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- W3215695002 title "Long Slot mmWave Low-SLL Periodic-Modulated Leaky-Wave Antenna Based on Empty SIW" @default.
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- W3215695002 doi "https://doi.org/10.1109/tap.2021.3137183" @default.
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