{'fraction_non_alphanumeric': 0.04013961605584642, 'fraction_numerical': 0.016579406631762654, 'mean_word_length': 4.461904761904762, '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}}
Printed Dual-beam Fixed-beam Leaky-Wave Antenna Based on Leaky Grounded Coplanar Waveguide

A novel dual-beam fixed-beam leaky-wave antenna (LWA) is proposed in this paper. This antenna has a very simple structure, which is basically a grounded coplanar waveguide (GCPW) printed on a specially shaped printed circuit board (PCB). Its working principle is that, for a GCPW with no ground vias (leaky GCPW), there will be a parallel plate waveguide (PPW) mode between its two ground layers, which couples with its GCPW mode. Because the GCPW mode has a phase velocity higher than that of the PPW mode, leaky-wave radiation will be generated from the GCPW to the PPW. This radiation is then radiated into the free space through a metal flare. Since the GCPW is nearly non-dispersive, the beam direction of this radiation is inherently not frequency scanning. Besides its simplicity, the proposed antenna has a pretty good performance. Measured results show a 3 dB realized gain bandwidth and -10 dB impedance bandwidth of larger than 26 – 40 GHz, a peak gain of 17.5 dBi, and a negligible beam scanning range of only 2.5° (±1.25°) across 26 – 40GHz.