An Investigation of Printed Franklin Antennas at X-Band Using Artificial (Metamaterial) Phase-Shifting Lines

Non-radiating artificial phase-shifting lines are constructed using conventional positive-refractive-index (PRI) transmission lines (TL) and the recently developed negative-refractive-index (NRI) transmission lines. The two types of fully printed artificial lines are used to implement microstrip Franklin antennas. The aim is to provide co-phase excitation to an array of half-wavelength dipoles, which generate a broadside beam at the design frequency. The proposed antenna structures not only retain the benefits of previously published designs but also feature a smaller footprint in the transverse direction. Between the two proposed antenna configurations, the PRI-TL based design allows broadside radiation with minimal beam squinting, while the NRI-TL based design provides a frequency steerable beam. A 14-element antenna array for each configuration is characterized using an intuitive TL model, and the study is experimentally verified at 12 GHz. The measured radiation patterns, directivity, gain, and beam-scanning capability are presented.

[1]  V. Veselago.  The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ , 1968 .

[2]  C. W. Turner,et al.  Design of broadband microstrip series array for mm-wave applications , 2002 .

[3]  J. R. James,et al.  Microstrip Antenna Theory and Design , 1981 .

[5]  K. Solbach,et al.  Microstrip-Franklin Antenna , 1982 .

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

[7]  G. Eleftheriades,et al.  Planar negative refractive index media using periodically L-C loaded transmission lines , 2002 .

[8]  G.V. Eleftheriades,et al.  Compact linear lead/lag metamaterial phase shifters for broadband applications , 2003, IEEE Antennas and Wireless Propagation Letters.

[9]  K. Gupta,et al.  Microstrip Lines and Slotlines , 1979 .

[10]  R. Bancroft,et al.  An omnidirectional planar microstrip antenna , 2004, IEEE Transactions on Antennas and Propagation.

[11]  George V. Eleftheriades,et al.  High-gain meanderless slot arrays on electrically thick substrates at millimeter-wave frequencies , 2002 .

[12]  Franklin type microstrip line antenna , 1979 .

[13]  J. R. James,et al.  Microstrip antennas and arrays. Part 1: Fundamental action and limitations , 1977 .

[14]  D. M. Pozar,et al.  Microstrip antennas , 1995, Proc. IEEE.

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

[16]  L. Lewin,et al.  Radiation from discontinuities in strip-line , 1960 .

[17]  A. Grbic,et al.  Experimental verification of backward-wave radiation from a negative refractive index metamaterial , 2002 .

[18]  Henry Jasik,et al.  Antenna engineering handbook , 1961 .