Broadband Circularly Polarized Crossed Dipole With Parasitic Loop Resonators and Its Arrays

• Published in: IEEE transactions on antennas and propagation 2011-01, Vol.59 (1), p.80-88
• Main Authors: BAIK, Jung-Woo, LEE, Tae-Hak, PYO, Seongmin, HAN, Sang-Min, JEONG, Jichai, KIM, Young-Sik
• Format: Article
• Language: English
• Subjects: Antenna measurements; Antennas; Applied sciences; Bandwidth; Broad axial ratio bandwidth; Broadband antennas; circularly polarized dipole; crossed dipole; Dipole antennas; dipole array; Exact sciences and technology; Frequency measurement; Gain; Radiocommunications; Resonant frequency; Telecommunications; Telecommunications and information theory
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2010.2090463

A novel printed crossed dipole with broad axial ratio (AR) bandwidth is proposed. The proposed dipole consists of two dipoles crossed through a 90°phase delay line, which produces one minimum AR point due to the sequentially rotated configuration and four parasitic loops, which generate one additional minimum AR point. By combining these two minimum AR points, the proposed dipole achieves a broadband circularly polarized (CP) performance. The proposed antenna has not only a broad 3 dB AR bandwidth of 28.6% (0.75 GHz, 2.25-3.0 GHz) with respect to the CP center frequency 2.625 GHz, but also a broad impedance bandwidth for a voltage standing wave ratio (VSWR) ≤2 of 38.2% (0.93 GHz, 1.97-2.9 GHz) centered at 2.435 GHz and a peak CP gain of 8.34 dBic. Its arrays of 1 × 2 and 2 × 2 arrangement yield 3 dB AR bandwidths of 50.7% (1.36 GHz, 2-3.36 GHz) with respect to the CP center frequency, 2.68 GHz, and 56.4% (1.53 GHz, 1.95-3.48 GHz) at the CP center frequency, 2.715 GHz, respectively. This paper deals with the designs and experimental results of the proposed crossed dipole with parasitic loop resonators and its arrays.