The Impact of Reduced Conductivity on the Performance of Wire Antennas

Low cost methods of antenna production primarily aim to reduce the cost of metalization. This might lead to a reduction in conductivity. A systematic study on the impact of conductivity is presented. The efficiency, gain and bandwidth of cylindrical wire meander line, dipole, and Yagi-Uda antennas were compared for materials with conductivities in the range $\mathrm{10^3}$ to $\mathrm{10^9}$ S/m. In this range, the absorption efficiency of both the dipole and meander line changed little, however the conductivity significantly impacts on radiation efficiency and the absorption cross section of the antennas. The extinction cross section of the dipole and meander line antennas (antennas that Thevenin equivalent circuit is applicable) also vary with radiation efficiency. From the point of radiation efficiency, the dipole antenna performance is most robust under decreasing conductivity. Antennas studied in this study were fabricated with brass and graphite. Radiation efficiency of the antennas were measured by improved Wheeler cap (IWC) method. Measurement results showed a reasonable agreement with simulations. We also measured the extinction cross section of the six fabricated prototypes.

[1]  Hans Steyskal,et al.  On the Power Absorbed and Scattered by an Antenna , 2010, IEEE Antennas and Propagation Magazine.

[2]  D.V. Thiel,et al.  Sustainable electronics: Wireless systems with minimal environmental impact , 2008, 2008 8th International Symposium on Antennas, Propagation and EM Theory.

[3]  Hans-Erik Nilsson,et al.  Printed antennas with variable conductive ink layer thickness , 2007 .

[4]  Leena Ukkonen,et al.  The Effect of Conductive Ink Layer Thickness on the Functioning of Printed UHF RFID Antennas , 2010, Proceedings of the IEEE.

[5]  H. A. Wheeler.  The Radiansphere around a Small Antenna , 1959, Proceedings of the IRE.

[6]  D. Kasilingam,et al.  Performance analysis of wearable microstrip antennas with low-conductivity materials , 2008, 2008 IEEE Antennas and Propagation Society International Symposium.

[7]  David V. Thiel,et al.  Plastic circuit reliability and design for recycling , 2009, 2009 11th Electronics Packaging Technology Conference.

[8]  W.E. McKinzie,et al.  A modified Wheeler cap method for measuring antenna efficiency , 1997, IEEE Antennas and Propagation Society International Symposium 1997. Digest.

[9]  John N. Sahalos,et al.  Pareto Optimal Yagi-Uda Antenna Design Using Multi-Objective Differential Evolution , 2010 .

[10]  N. S. Barnett,et al.  Private communication , 1969 .

[11]  S.R. Best,et al.  A Tutorial on the Receiving and Scattering Properties of Antennas , 2009, IEEE Antennas and Propagation Magazine.

[12]  M. Gustafsson,et al.  Forward Scattering of Loaded and Unloaded Antennas , 2012, IEEE Transactions on Antennas and Propagation.

[13]  Richard W. Ziolkowski,et al.  Analytical and Equivalent Circuit Models to Elucidate Power Balance in Scattering Problems , 2013, IEEE Transactions on Antennas and Propagation.

[14]  M. Gustafsson,et al.  Physical limitations on antennas of arbitrary shape , 2007, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[15]  R. H. Johnston,et al.  An improved small antenna radiation-efficiency measurement method , 1998 .

[16]  David V. Thiel,et al.  Generalised absorption efficiency of Yagi-Uda antennas , 2014, 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI).

[17]  Andrea Alu,et al.  Power Relations and a Consistent Analytical Model for Receiving Wire Antennas , 2010, IEEE Transactions on Antennas and Propagation.

[18]  Hugh O. Pierson,et al.  Handbook of carbon, graphite, diamond, and fullerenes : properties, processing, and applications , 1993 .

[19]  D. Pozar.  Scattered and absorbed powers in receiving antennas , 2004 .

[20]  R. E. Collin,et al.  Limitations of the Thevenin and Norton equivalent circuits for a receiving antenna , 2003 .

[21]  P. Pongpaibool,et al.  A study of cost-effective conductive ink for inkjet-printed RFID application , 2012, 2012 International Symposium on Antennas and Propagation (ISAP).

[22]  D.V. Thiel,et al.  Tapered Meander Line Antenna for Maximum Efficiency and Minimal Environmental Impact , 2009, IEEE Antennas and Wireless Propagation Letters.

[23]  Y. Cohen,et al.  Strong, Light, Multifunctional Fibers of Carbon Nanotubes with Ultrahigh Conductivity , 2013, Science.

[24]  A. Ishimaru.  Electromagnetic Wave Propagation, Radiation, and Scattering , 1990 .

[25]  R. Baughman,et al.  Carbon Nanotubes: Present and Future Commercial Applications , 2013, Science.

[26]  M. Gustafsson,et al.  Illustrations of New Physical Bounds on Linearly Polarized Antennas , 2009, IEEE Transactions on Antennas and Propagation.

[27]  David V. Thiel,et al.  An Investigation Into the Gustafsson Limit for Small Planar Antennas Using Optimization , 2013, IEEE Transactions on Antennas and Propagation.

[28]  L. J. Chu.  Physical Limitations of Omni‐Directional Antennas , 1948 .

[29]  W. Geyi,et al.  Derivation of equivalent circuits for receiving antenna , 2004, IEEE Transactions on Antennas and Propagation.

[30]  Carlos Mendes,et al.  Theoretical and experimental validation of a generalized Wheeler cap method , 2007 .

[31]  R. E. Collin.  Remarks on "Comments on the limitations of the Thevenin and Norton equivalent circuits for a receiving antenna" , 2003 .

[32]  Rodney G. Vaughan,et al.  Transmitting, receiving, and scattering properties of antennas , 2003 .

[33]  K.V.S. Rao,et al.  Low cost silver ink RFID tag antennas , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.