Duplexer using surface acoustic wave filters and electronic device equipped with the same

• US 20040219888A1
• Filed: 04/29/2004
• Published: 11/04/2004
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Fujitsu Limited, Fujitsu Media Devices Limited (Fujitsu Limited)
• Inventors: Tsutsumi, Jun, Iwamoto, Yasuhide, Inoue, Shogo
• Granted Patent: US 7,684,764 B2
• Time in Patent Office: Days
• US Class Current: 455/76
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49171 Fan-out arrangements
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 24/32 of an individual layer connector
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/15153 the die mounting substrate comprising a recess for hosting the device
• CPC Class Codes: H01L 2924/30111 matching
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Abstract

A duplexer includes two surface acoustic wave (SAW) filters having different center frequencies; a phase matching circuit that matches phases of the two SAW filters; a package in which the SAW filters and the phase matching circuit are housed, the package being composed of multiple layers; and a line pattern provided between at least one of the SAW filters and at least one of a transmit terminal and a receive terminal of the duplexer. The line pattern runs on at least two of the multiple layers within a range defined by peripheral ground patterns provided in the package.

Claims

1. A duplexer comprising:

two surface acoustic wave (SAW) filters having different center frequencies;

a phase matching circuit that matches phases of the two SAW filters;

a package in which the SAW filters and the phase matching circuit are housed, the package being composed of multiple layers; and

a line pattern provided between at least one of the SAW filters and at least one of a transmit terminal and a receive terminal of the duplexer,

the line pattern running on at least two of the multiple layers within a range defined by peripheral ground patterns provided in the package.

2. The duplexer as claimed in claim 1, wherein:

the line pattern has a first part provided on a first one of the multiple layers and a second part provided on a second one of the multiple layers; and

the first and second parts are substantially orthogonal to each other.

3. The duplexer as claimed in claim 1, wherein:

the line pattern has a first part provided on a first one of the multiple layers and a second part provided on a second one of the multiple layers; and

the first and second parts include portions that do not overlap each other in parallel.

4. The duplexer as claimed in claim 1, wherein the line pattern is sandwiched only between upper and lower ground patterns provided on layers just above and below said at least two of layers.

5. The duplexer as claimed in claim 1, further comprising a specific ground pattern for impedance adjustment provided on one of the multiple layers located above or below said at least two of the multiple layers.

6. The duplexer as claimed in claim 1, wherein:

the line pattern has a first part provided on a first one of the multiple layers and a second part provided on a second one of the multiple layers; and

the first part is interposed between ground lines provided on the first one of the multiple layers.

7. The duplexer as claimed in claim 1, wherein:

the line pattern has a first part provided on a first one of the multiple layers and a second part provided on a second one of the multiple layers; and

the first and second parts have curved portions.

8. A duplexer comprising:

two surface acoustic wave (SAW) filters having different center frequencies;

a phase matching circuit that matches phases of the two SAW filters; and

a package in which the SAW filters and the phase matching circuit are housed, the package being composed of multiple layers,

one of the multiple layers having a first surface on which at least one of a transmit footpad and a receive footpad is provided, and a second surface on which a ground pattern is provided so as not to overlap said one of the transmit footpad and the receive footpad.

9. A duplexer comprising:

two surface acoustic wave (SAW) filters having different center frequencies;

a phase matching circuit that matches phases of the two SAW filters; and

a package in which the SAW filters and the phase matching circuit are housed, the package being composed of multiple layers,

the multiple layers having a first layer on which a transmit footpad or a receive footpad is provided, and a second layer on which the phase matching circuit is provided, the first and second layers being next to each other,

the phase matching circuit having a line pattern having a portion close to one of the transmit and receive footpads.

10. An electronic apparatus comprising:

an antenna;

a duplexer connected to the antenna; and

transmit and receive systems connected to the duplexer, the duplexer comprising;

two surface acoustic wave (SAW) filters having different center frequencies;

a phase matching circuit that matches phases of the two SAW filters;

a package in which the SAW filters and the phase matching circuit are housed, the package being composed of multiple layers; and

a line pattern provided between at least one of the SAW filters and at least one of a transmit terminal and a receive terminal of the duplexer,

the line pattern running on at least two of the multiple layers within a range defined by peripheral ground patterns provided in the package.