Broadband Self-Complementary Antenna Arrays
In this paper, it is shown that stacking of dielectric slabs above planar self complementary antenna elements can reduce the degrading effect of the ground plane and hence be used to design broadband antenna arrays. The dielectric slabs act as filters and transform the impedance of the antenna elements. The slabs are chosen to be of equal optical thickness, and, hence, resembling the use of quarter-wavelength transformers in broadband matching resembling the use of quarter. The Bode-Fano theory is used to derive limitations on the bandwidth as a function of the Q-factor. Although the limitations are based on an approximate circuit model the results are useful and enhance our understanding of the planar array. Moreover it is shown that the self complementary patch array o®ers the possibility to design an in principle grating lobe free broadband array. Of course, this requires a very short inter element spacing and hence a very complex feeding network. Numerical results are presented for the in finte antenna array with broadside bandwidths of 4.7:1 at -13dB and of 5.5:1 at -17dB for the cases of two and three dielectric slabs, respectively.
KeywordsAntenna Array Input Impedance Ground Plane Antenna Element Perfectly Electric Conductor
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