{'fraction_non_alphanumeric': 0.03686635944700461, 'fraction_numerical': 0.013824884792626729, 'mean_word_length': 5.170454545454546, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Mutual Coupling Reduction for Compact Wideband Two-Element Dual-Polarized Array by Utilizing H-Shaped Interdigital Structure

An effective mutual coupling reduction method using a novel planar single-layer parasitic H-shaped interdigital structure is developed for wideband, compact, two-element, dual-polarized (DP) arrays. The center-to-center spacing between the antenna elements is 0.5 λL, where λL indicates the the wavelength in the lower bound of the array's operational bandwidth. It is indicated that by incorporating the H-shaped interdigital structure into the closely spaced two-element DP antenna array, the isolation levels between the co-polarization ports and those between the inter-element cross-polarization ports are both significantly improved across the entire working band of 1.7-2.2 GHz (a ~ 25.6% fractional bandwidth) without deteriorating the radiation efficiency of the array. Particularly, the E- and H-plane coupling levels are respectively reduced by more than 10.7 dB and 18.8 dB when the array is incorporated with the developed interdigital structure.