Compact Crossed-Dipole Antennas Loaded With Near-Field Resonant Parasitic Elements

Two compact planar crossed-dipole antennas loaded with near-field resonant parasitic (NFRP) elements are reported. The NFRP and crossed-dipole elements are designed for the desired circularly polarized (CP) radiation. By placing the NFRP element over the driven element at angles of 0° and 45°, respectively, dual-band and broadband CP antennas are realized. All radiating elements of antennas are 35 mm <inline-formula> <tex-math notation="LaTeX">$\times35$ </tex-math></inline-formula> mm <inline-formula> <tex-math notation="LaTeX">$\times0.508$ </tex-math></inline-formula> mm (<inline-formula> <tex-math notation="LaTeX">$0.187~\lambda _{0} \times 0.187 \lambda _{0} \times 0.0027 \lambda _{0}$ </tex-math></inline-formula> at 1.6 GHz) in size. The dual-band CP antenna has a measured <inline-formula> <tex-math notation="LaTeX">$\vert S_{11}\vert < -10$ </tex-math></inline-formula>-dB bandwidth of 226 MHz (1.473–1.699 GHz) and measured 3-dB axial ratio (AR) bandwidths of 12 MHz (1.530–1.542 GHz) and 35 MHz (1.580–1.615 GHz) with minimum AR CP frequencies of 1.535 GHz (AR = 0.26 dB) and 1.595 GHz (AR = 2.08 dB), respectively. The broadband CP antenna has a measured <inline-formula> <tex-math notation="LaTeX">$\vert S_{11}\vert < -10$ </tex-math></inline-formula>-dB bandwidth of 218 MHz (1.491–1.709 GHz) and a 3-dB AR bandwidth of 145 MHz (1.490–1.635 GHz). These compact antennas yield bidirectional electromagnetic fields with high radiation efficiency across their operational bandwidths.

[1]  Son Xuat Ta,et al.  Multi-Band, Wide-Beam, Circularly Polarized, Crossed, Asymmetrically Barbed Dipole Antennas for GPS Applications , 2013, IEEE Transactions on Antennas and Propagation.

[2]  Kwai-Man Luk,et al.  Small Antennas in Wireless Communications , 2012, Proceedings of the IEEE.

[3]  Son Xuat Ta,et al.  Crossed Dipole Antennas: A review. , 2015, IEEE Antennas and Propagation Magazine.

[4]  I. Park,et al.  A Compact Circularly Polarized Crossed-Dipole Antenna for an RFID Tag , 2015, IEEE Antennas and Wireless Propagation Letters.

[5]  M. Bolster,et al.  A New Type of Circular Polarizer Using Crossed Dipoles , 1961 .

[6]  Son Xuat Ta,et al.  Dual-band wide-beam crossed asymmetric dipole antenna for GPS applications , 2012 .

[7]  Richard W. Ziolkowski,et al.  High-Directivity, Electrically Small, Low-Profile Near-Field Resonant Parasitic Antennas , 2012, IEEE Antennas and Wireless Propagation Letters.

[8]  Peng Jin,et al.  Metamaterial-Inspired Engineering of Antennas , 2011, Proceedings of the IEEE.

[9]  R. Ziolkowski,et al.  Multi-Frequency, Linear and Circular Polarized, Metamaterial-Inspired, Near-Field Resonant Parasitic Antennas , 2011, IEEE Transactions on Antennas and Propagation.

[10]  Son Xuat Ta,et al.  Planar, Lightweight, Circularly Polarized Crossed Dipole Antenna for Handheld UHF RFID Reader , 2013 .

[11]  Bingzhen Sun,et al.  Inductively loaded and magnetically coupled small antenna with circular polarization , 2013 .

[12]  Peng Jin,et al.  Multifunctional, Electrically Small, Planar Near-Field Resonant Parasitic Antennas , 2012, IEEE Antennas and Wireless Propagation Letters.

[13]  Tatsuo Itoh,et al.  Metamaterial-Based Antennas , 2012, Proceedings of the IEEE.

[14]  Peng Jin,et al.  Multi-Functional, Magnetically-Coupled, Electrically Small, Near-Field Resonant Parasitic Wire Antennas , 2011, IEEE Transactions on Antennas and Propagation.

[15]  Richard W. Ziolkowski,et al.  Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements , 2015, IEEE Transactions on Antennas and Propagation.

[16]  Edward J. Rothwell,et al.  Antenna miniaturization: definitions, concepts, and a review with emphasis on metamaterials , 2014 .