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Gain Enhancement in Microstrip Patch Antennas Using Hybrid Substrates

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2 Author(s)
Rivera-Albino, A. ; Sch. of Electr., Comput. & Energy Eng., Arizona State Univ., Tempe, AZ, USA ; Balanis, C.A.

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 d2 of one-quarter of the free-space wavelength ( d1 = d2 = λ0/4) are selected. An unbiased ferrite, with relative permeability of μr2 = 14, relative permittivity of εr2 = 10, dielectric loss tangent tan δe = 0.0017, and magnetic loss tangent tan δm = 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.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:12 )