Abstract
A novel concept to design a dual-band, dual-sense circularly polarized (CP) antenna with a bandstop filtering response is presented by adopting an elaborate-designed irregular-shaped dielectric resonator (ISDR) and a dual-composite right/left-handed (D-CRLH)-based feeding network. First, the TEy111 and TEy113 modes of a rectangular DR (rDR) are simultaneously excited using an offset feeding slot, to realize the dual-band, linearly polarized (LP) operation in the x-direction. To eliminate the effects of the offset feeding on antenna performance, two types of edge-cuts and an impedance transformer are introduced. Secondly, another microstrip line and offset feeding slot are utilized to excite TEx111 and TEx113 modes of the DRA, obtaining dual-LP in two bands, and the corner truncation is introduced to reduce the cross-polarized field. Accordingly, a dual-band, dual-LP DRA with boresight radiation and low cross-polarization is achieved. After that, building on this design, a dual-band feeding network based on the D-CRLH resonator is employed to further implement the dual-sense CP operation. Finally, the ISDR is manufactured using 3-D printed technology for demonstration. The measured results show that the proposed antenna obtains a 3-dB axial ratio (AR) bandwidth of 9.3 % for the left-hand circular polarization (LHCP) at the lower band and 3.6 % for the right-hand circular polarization (RHCP) at the upper band. Moreover, the proposed antenna also features good suppression between two bands as the D-CRLH resonator offers a stopband filtering effect.
Published Version
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