MICROWAVE LOW PASS FILTER

• Main Authors: KAJIKAMI ERI, HOSOYA KENICHI
• Format: Patent
• Language: English; Japanese
• Published: 19.01.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE; WAVEGUIDES

To provide a low pass filter that satisfies all conditions of flatness of passband characteristics, steepness of cutoff characteristics, and broadband characteristics of cutoff band in the form of a distributed constant circuit applicable to a high frequency band such as a microwave.SOLUTION: In an even-order, polar, distributed constant low pass filter, the capacitance at the end is mounted with the tip open stub 7-6, and the width and length of the tip open stub functions as a capacitive element having a value around 20% of the capacitance value required from the characteristic function at the cutoff frequency. At a frequency four times the cutoff frequency, the filter is designed to have a value of 20% before and after the value corresponding to 1/4 wavelength at that frequency.SELECTED DRAWING: Figure 1 【課題】通過帯域特性の平坦性、遮断特性の急峻性、遮断帯域の広帯域性、の全ての条件を満たす低域通過フィルタを、マイクロ波等の高周波帯に適用可能な分布定数回路の形態で提供する。【解決手段】偶数次数、有極型、分布定数形態の低域通過フィルタであって、端部の容量を先端開放スタブ7-6で実装し、前記先端開放スタブの幅および長さを、遮断周波数においては特性関数から要求される容量値の前後２０％の値を有する容量素子として機能し、遮断周波数の４倍の周波数においては該周波数において１／４波長となる値の前後２０％の値となるように設計する。【選択図】図１