Synthesis of Time-Modulated Array With Reduced Sideband Radiation by Increasing Main-Beam Maximum

Abstract

In this letter, a novel method for synthesizing power pattern in time-modulated linear array is proposed. First, through a study and analysis, it is investigated that both maximum sideband radiation ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathrm{SR_{max}}$</tex-math></inline-formula> ) and the total amount of sideband power ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$P_\mathrm{{SR}}$</tex-math></inline-formula> ) of the time-modulated array are decreased when the maximum power of the main beam ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${P_{0}}_\mathrm{{max}}$</tex-math></inline-formula> ) at center frequency is increased toward its maximum value. Then, to synthesize the desired center frequency pattern with suppressed sideband radiations (SRs), unlike the conventional method of dealing <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathrm{SR_{\rm {max}}}$</tex-math></inline-formula> and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$P_\mathrm{{SR}}$</tex-math></inline-formula> other than the desired radiation parameters of the intended pattern, only <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${P_{0}}_\mathrm{{max}}$</tex-math></inline-formula> is invoked in formulating the cost function. Finally, the computational proficiency and the potential viability of the proposed method to realize the desired pattern by suppressing the SR has been illustrated through representative numerical results.