Unlock instant, AI-driven research and patent intelligence for your innovation.

Dielectric filter, dielectric duplexer, and communication apparatus

a technology of dielectric duplexer and dielectric filter, which is applied in the direction of electrical apparatus, coupling devices, waveguides, etc., can solve the problem of difficulty in downsizing the dielectric filter

Inactive Publication Date: 2008-08-26
MURATA MFG CO LTD
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a dielectric filter and a dielectric duplexer that can input or output balanced signals without using a balun. The filter includes a single dielectric member with a conductor film and two resonators, one of which is a λ / 2 resonator and the other a λ / 4 resonator. The filter can be easily produced and handled, and can be used in a communication apparatus. The duplexer includes the filter and can transmit or receive signals in a predetermined frequency range. The invention allows for the conversion of transmission modes and provides a compact and lightweight communication apparatus.

Problems solved by technology

This is one of the causes which make it difficult to downsize the dielectric filter.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dielectric filter, dielectric duplexer, and communication apparatus
  • Dielectric filter, dielectric duplexer, and communication apparatus
  • Dielectric filter, dielectric duplexer, and communication apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0032]The configuration of a dielectric filter according to the present invention will be described with reference to FIG. 1.

[0033]FIG. 1A is a plan view of the dielectric filter. Strip line electrodes 11, 12, and 13 are arranged adjacently to each other on the upper side of a dielectric substrate 20. An earth electrode is formed on substantially the whole of the underside of the dielectric substrate 20. The dielectric substrate 20, the strip line electrodes 11, 12, and 13, and the earth electrode constitute microstrip line resonators, respectively. Through-holes 16 electrically connect one ends of the strip line electrodes 11 and 12 to the earth electrode on the underside of the substrate, respectively. Strip line electrodes 10, 14, and 15 are provided as terminals, respectively. A capacitance C1 is generated between the strip line electrode 10 and the vicinity on the other end of the strip line electrodes 11, and capacitances C2 and C3 between the strip line electrodes 14 and 15 a...

second embodiment

[0039]Next, the configuration of a dielectric filter according to the present invention will be described with reference to FIGS. 2A and 2B.

[0040]FIG. 2A is an appearance perspective view of the dielectric filter. When the dielectric filter is surface-mounted onto a circuit substrate, the face of the dielectric filter shown on the lower right side of FIG. 2A is opposed to the circuit substrate.

[0041]In FIG. 2A, a dielectric block 1 is provided with three inner conductor formed holes 2a, 2b, and 2c. An outer conductor 3 is formed on the outer surface of the dielectric block 1 excluding the vicinities of the both open-ends of the inner conductor formed hole 2c. Inner conductors 5a, 5b, and 5c are formed on the inner walls of the inner conductor formed holes 2a, 2b, and 2c, respectively. Inner conductor non-formation portions g are formed in the inner conductor formed holes 2a and 2b, near the openings on one side thereof, respectively. With this configuration, each of the inner conduc...

third embodiment

[0043]FIGS. 3A and 3B are an appearance perspective view and an equivalent circuit diagram of a dielectric filter according to the present invention.

[0044]In this embodiment, as shown in FIG. 3A, three inner conductor formed holes 2a, 2b, and 2c are formed in a dielectric block 1. Inner conductors 5a, 5b, and 5c are formed on the inner walls of the inner conductor formed holes 2a, 2b, and 2c, respectively. An outer conductor 3 is formed on the outer surface of the dielectric block 1 excluding the opening faces on the upper side, viewed in FIG. 3A, of the inner conductor formed holes 2a and 2b, and the opening faces on the upper side and the underside, viewed in FIG. 3A, of the inner conductor formed hole 2C. Coupling electrodes 4a and 4b are formed on the opening faces on the upper sides, viewed in FIG. 3A, of the inner conductor formed holes 2a and 2b so as to be connected to the inner conductors 5a and 5b, respectively. Terminal electrodes 6, 7, and 8 are formed on the outer surfa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A λ / 2 resonator comprises an inner conductor formed hole having an inner conductor with both open-ends, formed therein, and λ / 4 resonators comprise inner conductor formed holes having inner conductors with one short-circuited ends and the other open ends, respectively. The resonators are coupled, whereby a terminal electrode connected to the vicinity of the one open end of one of the λ / 4 resonators functions as an unbalanced terminal, and terminal electrodes connected to both open ends of the λ / 2 resonator function as balanced terminals.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a dielectric filter for use in a high frequency band, a dielectric duplexer, and a communication apparatus using the dielectric filter or the dielectric duplexer.[0003]2. Description of the Related Art[0004]FIGS. 10A, 10B, and 10C show the configuration of a dielectric filter using a dielectric block, mainly for use in a microwave band. FIG. 10B is a front view showing the dielectric filter which is made to stand. FIG. 10A is a plan view thereof. FIG. 10C is a bottom view thereof. FIG. 10D is a left side view thereof. FIG. 10E is a right side view. In FIG. 10, a dielectric block 1 has inner conductor formed holes 2a, 2b, and 2c formed inside thereof, and inner conductors 5a, 5b, and 5c are formed on the inner walls of the holes 2a, 2b, and 2c. On the outer surface of the dielectric block 1, an outer conductor 3 is formed, and terminal electrodes 6 and 7 are provided in predetermined posi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): H01P5/10H01P1/203H01P1/205
CPCH01P1/2056H01P5/10
Inventor HIROSHIMA, MOTOHARUKURODA, KATSUHITONISHIJIMA, SHOHACHIKATO, HIDEYUKIMATSUMOTO, HARUO
Owner MURATA MFG CO LTD