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A novel planar dual-spiral monopole antenna with circular polarization (CP) operation is proposed. Dual asymmetrical strip-sleeves are utilized and shorted at the ground plane, the proposed CP design for 2.45 GHz band can easily be achieved and provides the impedance bandwidth (RL ≧10 dB) of about 240 MHz and the 3 dB axial-ratio (AR) bandwidth of about 130 MHz. The measured peak gain and radiation...
A novel planar dual-band monopole antenna with circular polarization (CP) operation is proposed. By appropriately introducing dual strip-sleeves shorted at the ground plane, the proposed dual-band CP design can easily be achieved with the impedance bandwidth (RL □10 dB) of about 266 / 980 MHz and the 3 dB axial-ratio (AR) bandwidth of about 103 / 700 MHz for 2.4 / 5.2 GHz wireless local area network...
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