THESIS
2021
1 online resource (xv, 106 pages) : illustrations (chiefly color)
Abstract
High-gain directional antennas are increasingly required for medical imaging, Internet
of Things, long-distance communication, and millimeter-wave applications. In high-gain
directional antenna design, common approaches such as 2-dimensional array and lens
antennas, often result in large sizes and complicated configurations. The traveling-wave
endfire antenna is a promising candidate to address these challenges. However, their
implementations is still not applicable to size-limited devices due to the loaded antenna
elements.
This thesis proposes a general method for traveling-wave endfire antenna design based
on periodic structures. To overcome the limitations of traditional traveling-wave endfire antennas, loaded antenna elements can be removed by using a continuous radiation source
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High-gain directional antennas are increasingly required for medical imaging, Internet
of Things, long-distance communication, and millimeter-wave applications. In high-gain
directional antenna design, common approaches such as 2-dimensional array and lens
antennas, often result in large sizes and complicated configurations. The traveling-wave
endfire antenna is a promising candidate to address these challenges. However, their
implementations is still not applicable to size-limited devices due to the loaded antenna
elements.
This thesis proposes a general method for traveling-wave endfire antenna design based
on periodic structures. To overcome the limitations of traditional traveling-wave endfire antennas, loaded antenna elements can be removed by using a continuous radiation source
model. Theoretical analysis is derived to explain the principle of the proposed method,
which suggests endfire radiation from periodic structures requires two basic conditions,
i.e., proper phase condition and field distribution of guided waves. Following this design strategy, three new compact traveling-wave endfire antenna designs are described
using periodic phase-shifting technique. A circularly-polarized endfire antenna design is
realized by processing the coupling waves in two normal directions. A broadband example is proposed based on the first higher-order mode along periodic structures. All these antenna designs have been fabricated and measured to prove the effectiveness of
this method. Measurement results agree well with simulated results. All these examples
can achieve high-gain endfire performance with no need for additional antenna elements,
which represents a major technology advance of the proposed method to traveling-wave endfire antenna design.
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