A Low-Profile Broadband 2D Array Based on Inverted-E and Π Shaped Shared Structure Elements

In this paper, A 2D array is proposed based on inverted-E and Π shaped linear array elements, characterized by a low-profile and broadband shared structure. The design utilizes a shared monopole top-hat and PIFA patch structure to form inverted-E and Π shaped bi-directional linear array elements with elliptical top-hats and grounded stubs. A high-gain end-fire quasi-Yagi 2D array is then realized by employing these two linear array elements, functioning respectively as driven and parasitic elements. A prototype of the proposed 2D array consisting of three sub-arrays (one inverted-E and two Π shaped elements) operating in the upper C-band (f<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> = 6.3GHz) is fabricated and tested. The measured peak gain reaches 9.3–10.3dBi within the 5.81–6.87GHz band, with an even wider impedance bandwidth (|S11| < −10dB) of 30.2% (5.49–7.44GHz) and a low profile of 0.063λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>.