DIELECTRIC RESONATOR AND DIELECTRIC FILTER

• Main Authors: ASHIDA YUTA, MIYAUCHI TAIJI, KIMURA KAZUNARI, TOMAKI SHIGEMITSU, TAKANE SUSUMU, NIMATA YOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE; WAVEGUIDES

To decrease an absolute value of a temperature coefficient of the resonant frequency of a dielectric resonator.SOLUTION: The dielectric filter includes a plurality of dielectric resonators. The dielectric filter comprises: a plurality of resonator body parts 3A, 3B, 3C, and 3D made of a first dielectric having a first relative dielectric constant and corresponding to the plurality of dielectric resonators; a surrounding dielectric part 4 which is made of a second dielectric having a second relative dielectric constant smaller than the first relative dielectric constant and is present around the plurality of resonator body parts 3A, 3B, 3C, and 3D; and a shield part 7 made of conductor. One of the temperature coefficient of the resonance frequency of the first dielectric and the temperature coefficient of the resonance frequency of the second dielectric at 25 to 85°C is a positive value, and the other temperature coefficient is a negative value.SELECTED DRAWING: Figure 1 【課題】誘電体共振器の共振周波数の温度係数の絶対値を小さくする。【解決手段】誘電体フィルタは、複数の誘電体共振器を含んでいる。誘電体フィルタは、第１の比誘電率を有する第１の誘電体よりなり、複数の誘電体共振器に対応する複数の共振器本体部３Ａ，３Ｂ，３Ｃ，３Ｄと、第１の比誘電率よりも小さい第２の比誘電率を有する第２の誘電体よりなり、複数の共振器本体部３Ａ，３Ｂ，３Ｃ，３Ｄの周囲に存在する周囲誘電体部４と、導体よりなるシールド部７を備えている。２５〜８５℃における第１の誘電体の共振周波数の温度係数と第２の誘電体の共振周波数の温度係数の一方は正の値であり、他方は負の値である。【選択図】図１