Gain enhancement in microstrip patch antennas using hybrid substrates

Alix Rivera-Albino, Constantine Balanis

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A substrate design that uses a ferrite ring to enhance the gain of a microstrip patch antenna without compromising the bandwidth is proposed. This design forces constructive interference between the incident and reflected fields inside the substrate. The interference is created by introducing a ferrite ring at a distance d1 from the circumference of the patch with a ring width d2. Initial values of d1 and d 2 of one-quarter of the free-space wavelength (d1 = d 2 = λ0/4) are selected. An unbiased ferrite, with relative permeability of μr2 = 14, relative permittivity of r 2 = 10, dielectric loss tangent tan δ e= 0.0017, and magnetic loss tangent tan δ m= 0.0391, is used. Using HFSS, the results of the patch antenna above a conventional substrate (i.e., no ferrite ring) and above the hybrid substrate (which includes the ferrite ring) are compared. Enhancements of about 4 dB in gain and nearly 1% in impedance bandwidth are obtained by using the hybrid substrate instead of the conventional one.

Original languageEnglish (US)
Article number6493382
Pages (from-to)476-479
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 2013


  • Antenna gain
  • microstrip antennas

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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