Abstract
This paper describes the ultra-wideband horn antenna design operating in quasi TEM mode. The antenna consist of a triangular 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 1.57 to 12.85 GHz bandwidth a 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.
Highlights
W IDEBAND structures have been employed in different radio communication systems
Ultrawideband radio communications systems (UWB) operating in 1 GHz to 10.6 GHz frequency band are applied in ground penetration radars (GPRs) [2], wall imaging systems [3], surveillance systems [4], among others [5]
The results show that the antenna impedance changes expressively for β lower than the defined in the antenna design
Summary
W IDEBAND structures have been employed in different radio communication systems. As example, ultrawideband radio communications systems (UWB) operating in 1 GHz to 10.6 GHz frequency band are applied in ground penetration radars (GPRs) [2], wall imaging systems [3], surveillance systems [4], among others [5]. In this context, some antenna models, such as the TEM horn antenna, have been developed with a compromise between a transmission line and radiation phenomenon behaviors. According to their geometries and design procedures, reflections in their extremities are avoided These antennas assume an almost ideal transmission line operation with a wide bandwidth because the radiated power has a load effect close to its characteristic impedance [9]. The microstrip model approach proposed by Shlager et al [14] was applied in the aperture dimensions of the triangular metal plate determination In this way, a horn antenna with a field distribution close to TEM wave in a transmission line is designed. If the transition is soft enough so that most of the energy is transferred to the external medium, its behavior is similar to a matched structure and the input impedance will have a significant contribution of its characteristic impedance
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