Circularly polarized broadband antenna with circular slot on circular ground-plane

A novel circularly polarized antenna with a circular radi- ating aperture and circular ground plane for broadband characteristics is presented in this paper. The vertical and horizontal components of the L-shaped probe are separated and placed at the front and back sides of the substrate. The antenna is excited by a microstrip line which is connected to the vertical component of the L-shaped probe and electromagnetically couples the signal to the horizontal compo- nent of the L-shaped probe. The concept of placing an appropriate stub in the slot, by observing the electric fleld vector behaviour in the slot, is proposed to enhance the axial ratio (AR) bandwidth by around 15%. The fabricated antenna shows wideband impedance and circu- lar polarization characteristics of 48% along with a maximum gain of 6dBic. The measured and simulated antenna characteristics are in good agreement.

[1]  Nagahisa Mita,et al.  Generation of Circular Polarization Using Rectangular Waveguide with L-Type Probe , 2003 .

[2]  N.C. Karmakar,et al.  A Novel Chipless RFID System Based on Planar Multiresonators for Barcode Replacement , 2008, 2008 IEEE International Conference on RFID.

[3]  J. Masa-Campos,et al.  Dual linear/circular polarized plannar antenna with low profile double-layer polarizer of 45º tilted metallic strips for wimax applications , 2009 .

[4]  Yong-Chang Jiao,et al.  A BROADBAND CPW-FED T-SHAPE SLOT ANTENNA , 2007 .

[5]  Kwai-Man Luk,et al.  Design and Study of Wideband Single Feed Circularly Polarized Microstrip Antennas , 2008 .

[6]  Stefan Lindenmeier,et al.  Antenna with optimized pattern for simultaneous reception of terrestrial signals and signals of geostationary satellites , 2010 .

[7]  Stefan Lindenmeier,et al.  Small satellite car antenna for simultaneous reception of LHCP and RHCP signals , 2009, 2009 3rd European Conference on Antennas and Propagation.

[8]  Hua-Ming Chen,et al.  Microstrip-Fed Circularly Polarized Square-Ring Patch Antenna for GPS Applications , 2009, IEEE Transactions on Antennas and Propagation.

[9]  Quan Xue,et al.  Ultrawideband Composite Cavity-Backed Folded Sectorial Bowtie Antenna With Stable Pattern and High Gain , 2009, IEEE Transactions on Antennas and Propagation.

[10]  R. Joseph,et al.  BANDWIDTH ENHANCEMENT OF CIRCULARLY POLARIZED SQUARE SLOT ANTENNA , 2011 .

[11]  Takeshi Fukusako,et al.  Broadband Square Slot Antenna for Circular Polarization with Separated L-Probes and Stubs in the Slot , 2011, IEICE Trans. Commun..

[12]  Yi-Cheng Lin,et al.  Novel Broadband Circularly Polarized Cavity-Backed Aperture Antenna With Traveling Wave Excitation , 2010, IEEE Transactions on Antennas and Propagation.

[13]  D. Pozar.  Microwave Engineering , 1990 .

[14]  Song Shi,et al.  Circularly polarized rectangularly bent slot antennas backed by a rectangular cavity , 2001 .

[15]  Horng-Dean Chen,et al.  Broadband CPW-fed square slot antennas with a widened tuning stub , 2003 .

[16]  T. Han,et al.  Microstrip‐fed circular slot antenna for circular polarization , 2008 .

[17]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[18]  R. Joseph,et al.  Circular slot antennas using L-shaped probe for broadband circular polarization , 2011 .

[19]  Zhongxiang Shen,et al.  An inverted microstrip-fed cavity-backed slot antenna for circular polarization , 2002 .