Abstract
In this paper, a reconfigurable circular-ring feed patch antenna for polarization diversity applications is proposed. The reconfigurability is realized by using only two p-i-n diodes which are inserted into the circular feed ring of the aperture-coupled patch antenna. With the help of the p-i-n diodes, the polarization of the antenna is able to be altered among 45° linearly polarized (LP), left-hand circularly polarized (LHCP), and right-hand circularly polarized (RHCP) states. A fully-functional prototype is fabricated and measured. The measurement agrees well with the simulation and three polarization states are obtained. Owing to the merits of tri-polarization diversity, low profile and simple structure, the proposed design is a great candidate for future wireless systems.
Highlights
With the popularity of wireless communication technologies, reconfigurable antennas with switchable linearly polarized (LP) or circularly polarized (CP) waves have been receiving much attention
By controlling the states of the p-i-n diodes, the antenna polarization can be switched between a pair of orthogonal CP modes and an LP mode
The three-dimensional configuration of the proposed antenna is illustrated in Figure 1, which consists of two microwave FR4 substrates (Substrate 1 and 2) and an air layer
Summary
With the popularity of wireless communication technologies, reconfigurable antennas with switchable linearly polarized (LP) or circularly polarized (CP) waves have been receiving much attention. Due to the feature of simple structure and easy fabrication, the resonant-type series feeding crossaperture coupled microstrip antenna have been studied over the past decades. This type of antenna is flexible to realize CP operation with wide axial ratio bandwidth and flat gain bandwidth. Its detailed radiating mechanism has been systematically analyzed based on the theory of the transmission line model [13] and the reciprocity method [14] Based on this idea, it is possible to design dual-band CP radiation. In [15], the authors employed a series feed line to couple a diamond-shaped slot to a ring and a cross-slot to a patch in series in order to realize a dual-band CP antenna. The series feeding aperture-coupled microstrip antenna becomes attractive for polarization reconfigurable designs
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