Low-Cost, Series–Parallel-Fed 2-Bit Phased Array Antenna in $Ku$-Band
Lu Yin, Peng Yang, Tao Dong, Jun Hu, Zaiping Nie
Abstract
In this letter, a low-cost, series–parallel-fed 2-bit phased array antenna for <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$Ku$</tex-math></inline-formula> -band 1-D beam scanning application is presented. The compact 2-bit element consists of a microstrip patch with 0 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ /180^\circ$</tex-math></inline-formula> phase states, dc bias circuits, ground, and a cascaded 90 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> phase shifter. Using the proposed element, a series–parallel-fed 9 × 8 array is fabricated and measured. Experimental results demonstrate the beam scanning capability in H-plane within the scan range of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\pm 50^\circ$</tex-math></inline-formula> , and also show high agreement compared with the simulated ones.