We have developed several methods of designing sparse periodic arrays based upon the polynomial factorization method. In these methods, transmit and receive aperture polynomials are selected such that their product results in a polynomial representing the desired combined transmit/receive (T/R) effective aperture function. A desired combined T/R effective aperture is simply an aperture with an appropriate width exhibiting a spectrum that corresponds to the desired two-way radiation pattern. At least one of the two aperture functions that constitute the combined T/R effective aperture function will be a sparse polynomial. A measure of sparsity of the designed array is defined in terms of the element reduction factor. We show that elements of a linear array can be reduced with varying degrees of beam mainlobe width to sidelobe reduction properties.

In this work, an M‐shaped broadband microstrip patch antenna with modified ground plane is proposed. A U‐shaped slot is loaded on the ground plane. In this work, the effect of the size of the square shaped ground plane on the impedance bandwidth is investigated. The dimension of the square shaped proposed ground plane is 26 × 26 mm2 which offers maximum 99% (2.94–8.7 GHz) simulated impedance bandwidth and maximum 3.66 dBi gain. The proposed antenna is simulated using Ansoft designer. The measured data exhibit agreement with simulated ones and it may be suitable for modern wireless communications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1308–1312, 2015

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In this article an U‐shape broadband monopole antenna with rectangular slots loaded ground plane has been designed and analysis. The proposed antenna covers the frequency band of (1.55–8.55 GHz) with multiresonating frequency at 1.65, 2.9, and 7.95 GHz. The effect of movement of radiating patch on the dielectric substrate and the effect of slots on the ground plane are studied. The maximum impedance bandwidth of 138% (simulated) and 142% (measured) with maximum peak gain 3.59 dBi (simulated) and 4 dBi (measured) are obtained. It is very much useful in modern wireless communication systems as an electronics device. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2544–2547, 2016