Circularly Polarized Conical-Beam Antenna With Wide Bandwidth and Low Profile

This work introduces a circularly polarized (CP) conical-beam antenna with low profile and wide impedance & axial ratio (AR) bandwidths. The antenna structure simply consists of a wideband monopolar patch antenna and eight parasitic loop stubs for generating vertically polarized electric field Eθ and horizontally polarized field Eφ, respectively. The proposed antenna is low profile but wideband because of merging the TM01 and TM02 modes at around the center frequency. In order to obtain the wideband CP radiation, the eight parasitic loop stubs are printed and placed sequentially along the radiating edge of the patch. With the resultant radiations from both the patch antenna and the loop stubs, the CP conical-beam radiation pattern can be obtained. In addition, a parametric study of the shorting vias effect, number of loop stub elements, and loop widths are demonstrated how to design this wideband CP antenna. The antenna exhibits the wide impedance bandwidth of 28% from 4.9 to 6.5 GHz (for the reflection coefficient ≤ -10 dB) and the 3-dB AR bandwidth of 14.4% from 5.8 to 6.7 GHz. The thickness of this antenna is only 0.06λ in terms of the free-space wavelength at its lowest operation frequency. Stable omni-directional conical-beam radiation patterns are observed over the operating bandwidth with the peak gain of 4.9 dBic. The antenna can cover the uplink of standard C band (5.85 to 6.425 GHz) for satellite communication.

[1]  An eight-branch folded strip antenna with a circular parasitic patch on circular ground plane for SDARS application , 2009, 2009 IEEE Antennas and Propagation Society International Symposium.

[2]  Zhenghe Feng,et al.  A circularly polarized antenna with conical beam , 2011, 2011 IEEE Electrical Design of Advanced Packaging and Systems Symposium (EDAPS).

[3]  Pedro Pinho,et al.  Omnidirectional printed loop antenna for taxi communications , 2013, 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI).

[4]  H. Kawakami,et al.  Research on circularly polarized conical-beam antennas , 1997 .

[5]  J. Yamauchi,et al.  A Wideband Circularly Polarized Conical Beam From a Two-Arm Spiral Antenna Excited in Phase , 2011, IEEE Transactions on Antennas and Propagation.

[6]  J. Huang,et al.  Circularly polarized conical patterns from circular microstrip antennas , 1984 .

[7]  J. Yamauchi,et al.  Horizontally polarized, omnidirectional antenna with a single feed , 2010, 2010 IEEE International Conference on Wireless Information Technology and Systems.

[8]  Kwok Wa Leung,et al.  Wideband Circularly Polarized Dielectric Bird-Nest Antenna With Conical Radiation Pattern , 2013, IEEE Transactions on Antennas and Propagation.

[9]  Zhenghe Feng,et al.  Design of a Wideband Horizontally Polarized Omnidirectional Printed Loop Antenna , 2012, IEEE Antennas and Wireless Propagation Letters.

[10]  Aleksandar Nesic,et al.  Circularly polarised printed antenna with conical beam , 1998 .

[11]  Junji Yamauchi,et al.  A low-profile conical beam loop antenna with an electromagnetically coupled feed system , 2000 .

[12]  Jeen-Sheen Row,et al.  Reconfigurable Circularly-Polarized Patch Antenna With Conical Beam , 2010, IEEE Transactions on Antennas and Propagation.

[13]  W. Cao,et al.  Low-Profile Patch Antennas With Vertical Monopole-Like Radiation Patterns Based on Modified Capacitive Coupling Structures , 2012, IEEE Antennas and Wireless Propagation Letters.

[14]  J. Takada,et al.  Circularly polarised conical beam radial line slot antenna , 1994 .

[15]  K. Ito,et al.  A printed antenna composed of strip dipoles and slots generating circularly polarized conical patterns , 1989, Digest on Antennas and Propagation Society International Symposium.

[16]  K. Luk,et al.  A wideband circularly polarized conical-beam patch antenna , 2006, IEEE Transactions on Antennas and Propagation.

[17]  Q. Xue,et al.  Design and Analysis of a Low-Profile and Broadband Microstrip Monopolar Patch Antenna , 2013, IEEE Transactions on Antennas and Propagation.

[18]  Wen Wu,et al.  Singly-Fed Circularly Polarized Circular Aperture Antenna With Conical Beam , 2013, IEEE Transactions on Antennas and Propagation.