Broadband Dual-Polarized Electromagnetic Transparent Antenna for Cross-Band Scattering Suppression
Yu‐Lin Chang, Qing‐Xin Chu
Abstract
Difficulty in achieving broadband impedance matching has become a technical problem that limits the development of electromagnetic transparent antennas (ETAs). In this letter, a broadband dual-polarized ETA is designed. It is achieved by etching nested split-slot resonators (N-SSRs) on the entire radiating arms. Etching N-SSRs can form two independently controllable decoupling bands (DB1 and DB2). Combining DB1 and DB2 can achieve broadband scattering suppression. The N-SSRs together form a high-order band-stop filter with good frequency selectivity. Due to the high skirt roll-off performance of the high-order band-stop filter, etching N-SSRs will not increase the difficulty of matching. Therefore, the proposed ETA can obtain well impedance matching performance while having a good cross-band scattering suppression capacity. Then, a dual-band shared-aperture antenna named P-DBSA is designed. The proposed ETA is used as a lower band element of the P-DBSA. Well impedance matching performance of VSWR <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$< $</tex-math></inline-formula> 1.5 in both lower band (1.68–2.85 GHz) and higher band (3.3–3.6 GHz) is realized by P-DBSA. Moreover, cross-band scattering is successfully suppressed.