{'fraction_non_alphanumeric': 0.02157788267026298, 'fraction_numerical': 0.024275118004045852, 'mean_word_length': 5.057142857142857, 'pattern_counts': {'":': 0, '<': 2, '<?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}}
A novel bandpass filter fed antipodal tapered slot antenna for millimeter wave imaging

In this paper, we propose antipodal tapered slot antenna with integrated bandpass filter over 23.5–40 GHz for high resolution imaging applications. The novel antenna feed comprises of half mode substrate integrated waveguide and rectangular slots with isosceles trapezoidal variation. The feed section gives a passband over 23.5–40 GHz with S11< −10 dB and S21≃ 0 dB. We present the design evolution procedure for the integrated filter antenna. The proposed antenna exhibits S11< −10 dB over the controlled bandwidth from 23.5 GHz to 40 GHz. We incorporate rectangular corrugations in the form of a staircase at the outer edges of the antenna and ground plane slots to achieve a stable gain and stable radiation pattern over the controlled bandwidth. The proposed antenna occupies a volume of 30.3 × 16 × 0.254 mm3, and is fabricated and tested. The measured results show good agreement with simulations. As compared to the state‐of‐the‐art approaches, the proposed antenna is compact in size and exhibits a constant gain and stable radiation pattern over the operating bandwidth. We describe case studies to illustrate the application of the proposed antenna in a wideband imaging system for the detection of concealed objects and material defects. The reconstructed images obtained with the proposed antenna demonstrate its potential for use in high‐resolution millimeter wave imaging systems.