Abstract
Miniaturization of a rectangular microstrip antenna using a magneto-dielectric substrate is discussed theoretically and experimentally. A compact magneto-dielectric substrate is designed using a metamaterial structure that can reduce the antenna dimensions by increasing the constitutive parameters of the substrate. Furthermore, the proposed structure is thin enough to be embedded in a single dielectric substrate. The area of the microstrip antenna with the proposed magneto-dielectric substrate at 2.4 GHz is reduced up to about 65% compared to a conventional dielectric microstrip antenna. The bandwidth of the miniaturized antenna is almost unchanged due to the increase of the magnetic permeability at the designed 2.4-GHz frequency. Finally, a fabricated version of the miniaturized antenna is tested and measured. The results of the measurement and simulation are in good agreement.
Highlights
DIELECTRIC SUBSTRATEA microstrip antenna with the proposed magneto-dielectric substrate is compared with other equivalent substrates
Miniaturization of a rectangular microstrip antenna using a magneto-dielectric substrate is discussed theoretically and experimentally
On host dielectric slabs were employed underneath the patch [2, 3]
Summary
A microstrip antenna with the proposed magneto-dielectric substrate is compared with other equivalent substrates. All substrates have the same thickness (hu + hb) and the resonant frequency of the antennas is fixed at 2.4 GHz. The substrates are listed as follows: 1) The proposed magneto-dielectric substrate, (Fig. 3). 2) An equivalent magneto-dielectric substrate with the constitutive parameters obtained by the method of [6]. The substrates are listed as follows: 1) The proposed magneto-dielectric substrate, (Fig. 3). In this case the substrate is not loaded by the embedded SRRs and it is a homogenous magneto-dielectric substrate modeled by εrequ(f) =εreff(f), μrequ(f)=μreff(f), tanδe(f)=tanδeeff(f) and tanδm(f)=tanδmeff(f), Fig. 2 (solid curves). Εreff(f)×μreff(f), μrref(f)=1 and tanδe=0.02, Fig. 2 (dasheddotted curve). 4) A nondispersive dielectric substrate with ref r eff r f
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