Planar leaky-wave antenna with flexible control of the complex propagation constant

Alejandro Javier Martinez-Ros*, Jose Luis Gomez-Tornero, George Goussetis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)


This communication demonstrates for the first time the capability to independently control the real and imaginary parts of the complex propagation constant in planar, printed circuit board compatible leaky-wave antennas. The structure is based on a half-mode microstrip line which is loaded with an additional row of periodic metallic posts, resulting in a substrate integrated waveguide SIW with one of its lateral electric walls replaced by a partially reflective wall. The radiation mechanism is similar to the conventional microstrip leaky-wave antenna operating in its first higher-order mode, with the novelty that the leaky-mode leakage rate can be controlled by virtue of a sparse row of metallic vias. For this topology it is demonstrated that it is possible to independently control the antenna pointing angle and main lobe beamwidth while achieving high radiation efficiencies, thus providing low-cost, low-profile, simply fed, and easily integrable leaky-wave solutions for high-gain frequency beam-scanning applications. Several prototypes operating at 15 GHz have been designed, simulated, manufactured and tested, to show the operation principle and design flexibility of this one dimensional leaky-wave antenna.

Original languageEnglish
Pages (from-to)1625-1630
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - Mar 2012


  • design
  • substrate integrated waveguide (SIW)
  • reflected wave
  • guide
  • microstrip antennas
  • leaky-wave antenna (LWA)
  • complex propagation constant
  • planar antennas
  • line
  • microstrip
  • scanning capability


Dive into the research topics of 'Planar leaky-wave antenna with flexible control of the complex propagation constant'. Together they form a unique fingerprint.

Cite this