Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1996-09-23
1998-08-18
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
3332191, 333230, 29600, H01P 120, H01P 710
Patent
active
057963185
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dual TM-mode dielectric resonator apparatus equipped with a window for electromagnetic field coupling, and also to a band-pass filter apparatus equipped with a plurality of dielectric resonator apparatuses mentioned above.
BACKGROUND ART
The Japanese patent Laid-Open publication No. Showa 61-157101 discloses a dual TM-mode dielectric resonator in which two TM-mode dielectric resonators are provided in the same cavity, and the respective modes are crossed to each other, with an object for miniaturizing a dielectric resonator using a TM-mode such as a TM.sub.110 mode or the like. Also, there has conventionally been known such a technique that a dielectric filter is made up by using a plurality of such multiple mode dielectric resonators.
When a plurality of dual TM-mode dielectric resonators are arranged to form an electromagnetic coupling between respective two dual TM-mode dielectric resonators, it is necessary to allow only magnetic field components in a predetermined direction to be transmitted and, for example, to shield magnetic field components perpendicular to the predetermined direction, so that a coupling is formed between resonance modes in a predetermined direction.
Further, when a primary coupling is formed by magnetic field components in a certain direction while a subordinate coupling is formed by magnetic field components in a direction perpendicular to the direction of the primary coupling, so that an attenuation pole is formed by, for example, jumping over two stages of the resonators to couple two resonators before and after the two stages of the resonators, it is conventional practice to use a partition plate acting as a window for electromagnetic field coupling as shown in FIG. 9.
As shown in FIG. 9, in a rectangular-cylinder-shaped cavity 2 comprising a dielectric having a shield conductor 2a formed on an outer surface thereof, there is placed a cross-shaped dielectric resonator 1 which has a dual TM-mode comprising two rectangular-columnar-shaped dielectrics which cross perpendicularly to each other. Then, a partition plate 3 which shields one opening of the cavity 2 is provided so as to be opposed to the front face of the dielectric resonator 1. The partition plate 3 comprises: a shield conductor 30s in which a plurality of slitted conductor openings 33 are formed on one surface of a dielectric plate 50 made of a ceramic plate composed of a ceramic material such as 2MgO, SiO.sub.2 --ZrSiO.sub.4 or the like, the conductor openings 33 being arranged so that their longitudinal directions are parallel to the horizontal direction and parallel to each other, as shown in FIG. 9; and a shield conductor 30c formed on an entire surface of four side faces of the dielectric plate 50. Further, a coupling adjustment plate 4 formed of a metal plate is soldered on the shield conductor 30c to cover a part of the slitted conductor openings 33.
However, in such a conventional dielectric resonator apparatus, the shield conductor 30s needs to be formed by baking a satisfactorily solderable silver paste so that the coupling adjustment plate 4 of a metal plate, can be soldered for the makeup of the partition plate 3 as shown in FIG. 9. Nonetheless, such a satisfactorily solderable silver paste generally has an extremely low adhesiveness to the dielectric plate such as a ceramic plate or the like. To favorably solder the coupling adjustment plate 4 with its adhesiveness maintained high, it has been necessary to provide the dielectric plate 50 with such a two-layered structure that a silver electrode film is formed on the surface of the dielectric plate 50 as a lower layer by baking the highly adhesive silver paste, while the favorably solderable silver paste is baked as an upper layer. In such a method, unfavorably, there occur shifts or distortions due to the overlapped coating of the silver paste, and this makes it difficult to enhance the dimensional accuracy of the slitted conductor openings 33. Also, when the coupling adjustment plate 4 is soldered
REFERENCES:
patent: 4839773 (1989-06-01), Ishikawa et al.
patent: 5638037 (1997-06-01), Kurisu et al.
Ishikawa et al. "800 MHz High Power Duplexer Using TM Dual Mode Dielectric Resonators", IEEE MTT-S Digest, vol. III, pp. 1617-1620, Jun. 1, 1992.
Youhei Ishikawa et al., "Duplexer Using Dielectric TM Dual Mode Resonator for Cellular Base Station," Proceedings of the 1991 IEICE Fall Conference, Part 2, Communications and Electronics, C-91, pp. 2-372, Sep. 5, 1991 together with a partial English translation thereof.
Abe Shuichi
Ando Masamichi
Ham Seungsook
Murata Manufacturing Co. Ltd.
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