{'fraction_non_alphanumeric': 0.034482758620689655, 'fraction_numerical': 0.009578544061302681, 'mean_word_length': 4.679347826086956, '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}}
EM Design of Miniaturized FSS based Low Observable Antenna for Aerospace Application

The EM design and analysis of miniaturized FSS based low RCS (radar cross section) patch antenna is presented for aerospace applications. The ground plane of conventional patch array is replaced with a hybrid ground plane consisting of metal plate and miniaturized FSS unit cells. The band reject characteristic of FSS element covers operating bandwidth of the patch array, hence leads to both in-band and out-of-band RCS reduction. A lx4 patch array antenna using hybrid ground plane is designed at X-band showing a maximum of-15 dBsm out-of-band and -2 dBsm in-band structural RCS reduction. Further, a conformal patch array is designed using the modified hybrid ground plane that exhibits -15dBsm (max.) out-of-band RCS reduction and -3dBsm in-band RCS reduction. Thus, the structural RCS reduction (both in-band and out-of-band) over a wide bandwidth (2–18 GHz) is achieved without any adverse effects on the radiation characteristics of the patch array.