Abstract
Abstract A pattern reconfigurable antenna array with two elements is designed in this paper. The antenna element is made up of a printed Yagi and feed structure with variable phase. By changing the states of diodes in the feed structure of these two elements, the far-field radiation phase of both elements can be changed. That is, the pattern reconfigurable function of the array is realized. In this way, the impedance bandwidth of array is 75.9% (2.7~6.0 GHz), in which the peak gain direction can be switched between -θ, 0 and +θ (θ = 10°~16° at different frequencies). With the simple reconfigurable structure, the peak gain direction can be adjusted according to demands. It can be applied to broadband investigation systems. To verify the feasibility, a prototype is fabricated, measured, and reasonable agreement between the simulated and measured results is obtained.
Highlights
Recently, reconfigurable antennas are the focus of research because they have more flexibility than normal antennas under the same aperture
Reconfigurable antennas are classified as frequency [1], [2], polarization [3], [4] pattern [5]-[10], and hybrid reconfigurable antennas [11], [13]
In [9], the main beam of antenna can be switched to five directions by using the principle of the switchable director and reflector
Summary
Reconfigurable antennas are the focus of research because they have more flexibility than normal antennas under the same aperture. Antennas with elevation switchable beam are discussed. In [9], the main beam of antenna can be switched to five directions by using the principle of the switchable director and reflector. In [10], and [11], two patch antennas are designed by the principle of switchable directors with simple structure, but the bandwidth of 5.6% and 1.7% is not appropriate for investigation systems. Pattern reconfigurable antenna arrays with wideband performance are needed. A two-element array is designed, the pattern of which can be changed by four groups of radio frequency (RF) switches on each element to achieve the reconfigurable pattern in elevation plane. The impedance bandwidth of the array is 75.9%, and the peak gain direction can be switched among -θ, 0 and +θ (θ = 10°~16°at different frequencies).
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