TY - JOUR AU - Левченко, О. В. AU - Каращук , Н. М. PY - 2022/12/30 Y2 - 2024/03/28 TI - Experimental Study of Antenna Patterns for On-board Antennas with Extremely Narrow Radiation Patterns: JF - Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia JA - RADAP VL - IS - 90 SE - DO - 10.20535/RADAP.2022.90.5-12 UR - https://radap.kpi.ua/radiotechnique/article/view/1874 SP - 5-12 AB - <p>The publication presents the results of an experimental study of antenna pattern (AP) for a slit cut in a rectangular waveguide with a cross section of 23 х 10 mm, which was excited by a pin in E- and H- planes at a frequency of 10 GHz. It was experimentally discovered that AP width in the E- plane was 84°. The AP level decreased to 20% in the directions ±90°. AP had a width of 54° in the H-plane. The AP level decreased to 5% in the directions ±90°. The experimental AP obtained in the E- and H- planes were consistent with the theoretically calculated ones, while the discrepancy did not exceed 7%. The publication includes as well the results of AP experimental study for a slit cut in a rectangular waveguide with a cross section of 23 х 10 mm, which was excited by a pin in E- and H- planes at a frequency of 7 GHz. Fluoroplastic plates (fluoroplast F4) were inserted into a rectangular waveguide near narrow walls, which sizes were: 79×10×2 mm (L×W×H) with a relative dielectric constant <em>ε</em><sub>r </sub>= 2. It was experimentally discovered that AP width was 72° in the E- plane, AP level decreased to 25% in the directions ±90°. For the H-plane 43°, AP level decreased to 7% in the directions ±90°. Partial loading with dielectric material when used in a rectangular waveguide makes it possible to reduce its geometrical sizes without changing the electrical ones.<br /><br />The research results can be applied to design and develop on-board antennas with extremely narrow radiation patterns used for centimeter wavelength radio channels.</p> ER -