This paper describes the ultra-wideband horn antenna design operating in quasi TEM mode. The antenna consists of a triangular plate with an inclination angle above a ground plane and directly fed by a coaxial cable. Broadband characteristics, radiation pattern, high gain, and a small reflection coefficient were achieved. Its performance analysis and main parameters effects were obtained by using ANSYS HFSS R software. In the numerical analysis, an optimized model was obtained in 1.57 to 12.85 GHz bandwidth an 11 to 14 dBi gain. The proposed antenna was manufactured and the measured reflection coefficient results show an operation frequency range between 1.48 and 10.12 GHz, agreeing very well with simulations.
We demonstrate a concept for a large enhancement of the directivity and gain of readily available cm- and mm-wave antennas, i.e., without altering any property of the antenna design. Our concept exploits the high reflectivity of a Bragg reflector composed of three bilayers made of transparent materials. The cavity has a triangular aperture in order to resemble the idea of a horn-like, highly directive antenna. Importantly, we report gain enhancements of more than 400% in relation to the gain of the antenna without the Bragg structure, accompanied by a highly directive radiation pattern. The proposed structure is cost-effective and easy to fabricate with 3D-printing. Our results are presented for frequencies within the conventional WiFi frequencies, based on IEEE 802.11 standards, thus, enabling easily implementation by non-experts and needing only to be placed around the antenna to improve the directivity and gain of the signal.
This paper describes the design of a wideband horn antenna operating in quasi TEM mode. The antenna consists of a triangular conductive plate with an inclination angle above a ground plane and directly feed by a coaxial cable. Broadband characteristics, radiation pattern, high gain and small reflection coefficient were achieved. Its performance analysis and main parameters effects were obtained by using ANSYS HFSS ® software. In the numerical analysis, an optimized model was obtained in 2.52 to 16.3 GHz band with a 10 to 12 dBi gain. The reflection coefficient was measured and the results were consistent with simulations.
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