Dielectric filter, dielectric duplexer, mounting structure thereof, and communication device

Abstract

The invention provides a dielectric filter, comprising: a dielectric block including a first surface and a second surface opposite to each other; a resonator hole extending between the first surface and second surface of the dielectric block, said resonator hole including a large-sectional area portion, a small-sectional area portion and a step portion between the large-sectional area portion and the small-sectional area portion; an inner conductor provided on the inner surface of the resonator hole; an outer conductor provided on the outer surface of the dielectric block; the inner conductor being electrically left unconnected to the outer conductor at the first surface of the dielectric block and being electrically connected to the outer conductor at the second surface of the dielectric block; and a seat portion provided on the first surface of the dielectric block such that the first surface serves as a mounting surface of the dielectric filter.

Description

technical field [0001] The invention relates to a dielectric filter, a dielectric duplexer and its mounting structure, and a communication device. Background technique [0002] In recent years, thin communication devices such as mobile phones, which are small in size and light in weight, have been widely and rapidly spread and used. With the widespread use of these devices, it is required to develop a dielectric filter and a dielectric duplexer that are small in size, light in weight, and small in thickness to be mounted on the above-mentioned types of devices. [0003] Usually, known as Figure 11 The dielectric filter shown. The dielectric filter 8 includes a plurality of resonator holes 3 provided in a single dielectric block 2 on the surface of which an outer conductor 1 is provided. An inner conductor 4 is provided on the inner surface inside each resonator hole 3 . The inner conductor 4 is on the side 2b of the dielectric block 2, i.e. Figure 11 The rear surface of...

AI Technical Summary

Problems solved by technology

For this reason, it is just more difficult to reduce the height of dielectric filter 8

In some cases, the electromagnetic field leaked from the open surface 2a may adversely affect the characteristics of other electronic components mounted on the circuit board 6

Similarly, electromagnetic fields leaked from other electronic components may also adversely affect the characteristics of the dielectric filter 8 in some cases.

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