Abstract
The design and implementation of an ultra-wideband trapezoidal log-periodic antenna (LPA) integrated with an elliptical dielectric lens are presented. The proposed LPA is fed by an ultra-wideband microstrip-to-coplanar stripline transition structure. In order to improve the radiation patterns and to increase the antenna gain, an elliptical dielectric lens is mounted on the top of the LPA radiator. The design parameters of the elliptical lens integrated with the LPA were optimized through a parametric analysis. The proposed antenna shows an impedance bandwidth (S11 ≤ −10 dB) from 5.2 to 40 GHz, with a peak gain of 17.8 dB.
Highlights
Wide-bandwidth antennas are in high demand due to their ability to offer high-data-rate transmission.In the last decade, ultra-wideband (UWB) and, recently, super-wideband (SWB) microwave antennas have gained significant attention from researchers due to their many attractive features
The operating bandwidth of the trapezoidal log-periodic antenna (LPA) is slightly shifted to higher frequencies due to the increased effective dielectric constant induced by the dielectric lens attached on the antenna board
A design for an ultra-wideband trapezoidal LPA integrated with an elliptical dielectric lens is presented
Summary
Wide-bandwidth antennas are in high demand due to their ability to offer high-data-rate transmission. A log-periodic antenna (LPA), often called a “frequency-independent antenna”, typically has a very wide frequency bandwidth [17,18]. In [22], a dielectric slab was loaded on a trapezoidal toothed LPA for bandwidth enhancement and miniaturization, and the antenna gain was improved to 6.1 dBi. the reported antennas typically suffered from. At microwave frequencies, the planar antenna cannot be considered as a point source, and improved radiation patterns and gains can be obtained by optimizing the dielectric lens shape. An antenna integrated with a dielectric lens can have mostly unidirectional radiation patterns with a wide frequency bandwidth [22]. A new design for an ultra-wideband trapezoidal LPA integrated with an elliptical dielectric lens is presented. The dielectric lens, mounted on the top of the trapezoidal radiator, directs the antenna’s radiated beam to the main lobe direction, increasing the antenna gain
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