JP2002335143A - Shared antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shared antenna which has superior isolation characteristic, even if is made compact in size. SOLUTION: The shared antenna has a package 11, having its formed reception, transmission, antenna terminal, and ground terminals 14a, 14b, 14c, 14d respectively; a phase line, formed inside the package 11 whose one end, is connected with the antenna terminal 14c; a transmission-oriented SAW filter 20 mounted inside the package 11 and having its input side connected with the transmission terminal 14b, and having its output side connected with the input terminal of the phase line; and a reception-oriented SAW filter 21, mounted inside the package 11 and having its input side connected with the output terminal of the phase line, and having its output side connected with the reception terminal 14. The shared antenna has input and output terminals of the phase line provided respectively at the end portions opposite to the package 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer used for wireless communication equipment, for example.

[0002]

2. Description of the Related Art A conventional antenna duplexer will be described with reference to the drawings.

FIG. 6 is a sectional view of a conventional duplexer, and FIG. 7 is a sectional view of the same duplexer taken along line AB.

[0006] In FIGS. 6 and 7, reference numeral 1 denotes a package having transmission and reception terminals, an antenna terminal, and a ground terminal, 2 denotes a phase line provided inside the package 1, 3 denotes a transmission mounted in the package 1, SAW filter for reception, 4
Is a wire connecting the transmitting and receiving SAW filter 3 to each terminal of the package 1, and 5 is a lid for sealing the package 1.

[0005] A method of manufacturing the antenna duplexer configured as described above will be described.

First, as shown in FIG. 7, a meandering phase line 2 using silver or copper is formed on the surface of a glass ceramic substrate forming the bottom of the package 1. The input and output terminals of the phase line 2 are arranged at the same end of the package 1.

Next, a desired number of glass-ceramic substrates are laminated on and under the substrate, and a glass-ceramic frame is superimposed on the glass-ceramic substrates and integrally fired to form a package 1.
Get. At this time, send to the internal surface of the package, receive terminal,
A ground terminal is also formed.

On the other hand, a transmitting and receiving SAW having an interdigital transducer (hereinafter referred to as IDT) and connection electrodes connected to the IDT on a piezoelectric substrate, respectively.
The filter 3 is formed and mounted on the inner bottom surface of the package 1.

Next, after connecting the connection electrodes of the transmitting and receiving SAW filters 3 and the various terminals of the package 1 with the wires 4, the opening of the package 1 is sealed with the lid 5 to obtain an antenna duplexer.

[0010]

In recent years, there has been a demand for downsizing of electronic components used with the downsizing of wireless communication devices. However, if the size is reduced with the above configuration, the input and output terminals of the phase line 2 are arranged close to each other, and electromagnetic interference of transmission and reception signals occurs, and sufficient isolation can be ensured. There was a problem that it was not possible.

An object of the present invention is to provide an antenna duplexer which is excellent in isolation characteristics even if it is miniaturized.

[0012]

In order to achieve the above object, the present invention has the following arrangement.

[0013] The invention described in claim 1 of the present invention is, in particular,
The input and output terminals of the phase line are located at the opposite ends of the package, and the distance between the input and output terminals of the phase line is long. Interference can be prevented, and the antenna duplexer is small and has excellent isolation characteristics.

[0014] The invention described in claim 2 of the present invention is, in particular,
The transmitting and receiving terminals are provided on opposite ends different from the end on which the antenna terminal is formed, and a shield electrode is provided between the transmitting and receiving terminals and the phase line on the surface on which the phase line is formed. In addition, the shield function can prevent electromagnetic interference of transmission and reception signals between the transmission and reception terminals and the phase line, thereby obtaining an antenna duplexer having excellent isolation characteristics. Furthermore, since the transmitting and receiving terminals are provided at opposite ends different from the end at which the antenna terminal is formed, the distance between the terminals becomes longer, and interference of electromagnetic waves between the terminals can be minimized. An antenna duplexer having excellent isolation characteristics can be obtained.

[0015] The invention described in claim 3 of the present invention is, in particular,
In the meander-shaped phase line composed of the long side line portion and the folded line portion, the straight line connecting the long side line portion and the terminal of the phase line intersects, and the phase close to the transmitting and receiving terminals By minimizing the area of the line as much as possible, it is possible to reduce electromagnetic interference between transmitted and received signals and obtain excellent isolation characteristics.

The invention described in claim 4 of the present invention particularly provides
A transmitting and receiving SAW filter is formed on a single piezoelectric substrate, and a connection electrode of the transmitting SAW filter connected to the transmitting terminal of the package and a receiving filter connected to the receiving terminal are formed on the piezoelectric substrate. Electrodes are provided at opposite ends, and connection electrodes of a transmitting and receiving SAW filter connected to a phase line are provided at opposite opposite ends different from both ends provided with these connection electrodes. Since the distance between the connection electrodes is long, electromagnetic interference between transmitted and received signals can be reduced, and an antenna duplexer having excellent isolation characteristics can be obtained.

[0017] The invention described in claim 5 of the present invention particularly provides
The transmitting and receiving SAW filters are formed on a single piezoelectric substrate, and the terminals of the phase line and the transmitting and receiving terminals of the package are electrically connected to each other. It is a shield action,
It can reduce the electromagnetic interference of transmission and reception signals,
It becomes an antenna duplexer with excellent isolation characteristics.

[0018] The invention described in claim 6 of the present invention is, in particular,
The distance between the phase line and the transmitting and receiving terminals is set to 300 μm or more. Even if the antenna duplexer is miniaturized, electromagnetic interference of signals between the phase line and the transmitting and receiving terminals can be prevented. The isolation characteristics obtained are as follows.

The invention described in claim 7 of the present invention particularly provides
A shield electrode is provided between the transmitting and receiving terminals and the phase line on the surface on which the phase line is formed. The shield function prevents electromagnetic interference of signals between the transmitting and receiving terminals and the phase line. As a result, an antenna duplexer having excellent isolation characteristics can be obtained.

The invention according to claim 8 of the present invention particularly provides
The distance between the phase line and the transmitting and receiving terminals is 300 μm or more. Even when the antenna duplexer is downsized, electromagnetic interference of signals between the phase line and the transmitting and receiving terminals can be prevented. Excellent isolation characteristics can be obtained.

The invention as defined in claim 9 of the present invention particularly provides
The transmitting and receiving terminals are provided at opposite ends different from the end where the antenna terminal is formed, the distance between each terminal is large, and the electromagnetic interference of signals between each terminal is minimized. Therefore, an antenna duplexer having excellent isolation characteristics can be obtained.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;

FIG. 1 is a sectional view of an antenna duplexer according to an embodiment of the present invention, FIG. 2 is a sectional view of the antenna duplexer, and FIG. 3 is a top view of the antenna duplexer before sealing with the lid. FIG. 4 is a bottom view of the antenna duplexer, and FIG. 5 is a circuit diagram of the antenna duplexer. FIG. 1 is a sectional view taken along line CD of FIG.

1 to 5, reference numeral 11a denotes a first substrate;
11b is a second substrate laminated on the first substrate 11a, 11b
c is a first frame laminated on the second substrate 11b, and 11d is a second frame laminated on the first frame 11c, and these are integrally fired to constitute the package 11. The first substrate 11a, the second substrate 11b, the first frame 11c, and the second frame 11d are formed using a glass ceramic having a dielectric constant of about 8. 12, a phase line provided between the first substrate 11a and the second substrate 11b;
Reference numerals a and 12b denote input and output terminals of the phase line 12, 12c denotes a long side line forming the phase line, and 12d denotes a folded line forming the phase line 12. 13a and 13b are shield electrodes provided on the first substrate 11a, 14a is a receiving terminal, 14b is a transmitting terminal, 14c is an antenna terminal, 14d
Is a ground terminal.

Further, 15 is a piezoelectric substrate, 16 is a connection electrode,
16a is an input connection electrode, 16b is an output connection electrode, 1
6c is a ground connection electrode, 17 is an IDT, 18 is a connection electrode, 18a is an input connection electrode, 18b is an output connection electrode, 18c is a ground connection electrode, 19 is an IDT, 20 is a piezoelectric substrate 15, and a connection electrode 16 , Input connection electrode 16a, output connection electrode 16b, ground connection electrode 16c, IDT1
7, a transmitting SAW filter including the piezoelectric substrate 15, the connecting electrode 18, an input connecting electrode 18a, an output connecting electrode 18b, a grounding connecting electrode 18c, and a receiving SAW filter including an IDT 19; This is a SAW element in which sending and receiving SAW filters 20 and 21 are formed on a single piezoelectric substrate 15 and mounted in a package 11.
Reference numeral 23 denotes a die bond resin for fixing the SAW element 22 to the package 11, and reference numeral 24 denotes an input connection electrode 16a, an output connection electrode 16b, a ground connection electrode 16c, an input connection electrode 18a, an output connection electrode provided on the SAW element 22. Connection electrode 1
8b, a wire for connecting the ground connection electrode 18c to the various terminals 14a to 14d provided on the package 11, and 25 a lid for sealing the package 11.

The package 11 will be described in more detail with reference to the drawings.

As shown in FIG. 1, a phase line 12 formed on a first substrate 11a has input and output terminals 12a and 12b arranged at opposing ends, and a linear metal strip line is provided between the terminals. It is combined so that it becomes a shape. In addition, of the long side line portion 12c and the folded line portion 12d constituting the meander pattern, the long side line portion 12c is formed.
c and the input / output terminals 12a and 12b of the phase line 12 are arranged so as to intersect with each other, and the transmission / reception terminals 14
The area of the metal strip line adjacent to b, 14a is made as small as possible. Further, the phase line 12 is at least 300 μm away from the transmitting and receiving terminals 14b, 14a. In addition, the first substrate 11a on which the phase line 12 is formed
The shield electrodes 13a and 13b are provided between the transmitting and receiving terminals 14b and 14a and the phase line 12 so as to surround the outer periphery of the receiving and transmitting terminals 14b and 14a.

The transmitting and receiving SAW filters 20 and 21
Input / output connection electrodes 16a, 16b, 18a, 18b
Are arranged at different ends on the piezoelectric substrate 15 so that the distance between the connection electrodes is as long as possible.
Further, the phase line 1 corresponding to the input / output connection electrodes 16a, 16b, 18a, 18b of the transmission and reception SAW filters.
2, input / output terminals 12a, 12b, send / receive terminal 14
b and 14a are connected by a signal line such as a wire 24, and a ground is always interposed between adjacent signal lines.

A method of manufacturing the antenna duplexer configured as described above will be described.

First, a first substrate 11a, a second substrate 11b, a first frame 11c, and a second frame 11d are manufactured using glass ceramic green sheets.

Next, on the surface of the first substrate 11a, as shown in FIG.
On the lower surface, a and 13b are sent and a ground layer (not shown) is formed, and as shown in FIG. 4, receiving terminals 14b and 14a, an antenna terminal 14c, and a ground terminal 14d are formed. In addition, a ground layer is formed on the upper surface of the second substrate 11b using silver. Further, the upper surface of the first frame 11c is sent using silver, the receiving terminals 14b and 14a, the input and output terminals 12 of the phase line,
a, 12b and a ground terminal 14d are formed. Moreover,
A ground layer is formed on the upper surface of the second frame 11d using silver.

Next, the second substrate 11 is placed on the first substrate 11a.
b, and the first frame 11c is stacked on the second substrate 11b.

Thereafter, the transmitting and receiving terminals 14 provided on the bottom surface of the first substrate 11a using through-hole electrodes on the side surfaces of the first substrate 11a, the second substrate 11b, and the first frame 11c.
b, 14a and the transmitting and receiving terminals 14b, 14a provided on the upper surface of the first frame 11c, the antenna terminal 14c provided on the bottom of the first substrate 11a, and the phase line 12 provided on the upper surface of the first frame 11c. The input terminal 12a and the ground terminal 14d provided on the bottom surface of the first substrate 11a are connected to the ground terminal 14d provided on the upper surface of the first frame 11c.

Then, a second frame 11d is laminated on the first substrate 11a, the second substrate 11b, and the first frame 11c.

Then, the first substrate 11a, the second substrate 11b,
The ground terminals 14d provided on the bottom surface of the first substrate 11a and the ground layers formed on the upper surface of the second frame 11d are connected to the side surfaces of the first frame 11c and the second frame 11d by using through-hole electrodes.

The second substrate 11b and the first frame 11c receive the phase line 12 formed on the first substrate 11a, and the output terminals 12a, 12b and the phase line 12 formed on the first frame 11c. , And through electrodes (not shown) for connecting the output terminals 12a and 12b, respectively.

Thereafter, the package 11 is baked and plated to obtain the package 11.

On the other hand, as shown in FIG. 3, SAW filters 20 and 21 for sending and receiving on a piezoelectric substrate 15 made of a single crystal such as lithium tantalate and lithium niobate.
In order to form the SAW element 22 having IDTs, the IDTs 17 and 1 are formed by using a laminated electrode using an aluminum alloy and titanium.
9 and connection electrodes 16 connected to the IDTs 17 and 19,
Input connection electrode 16a, output connection electrode 16b, ground connection electrode 16c, connection electrode 18, input connection electrode 18
a, an output connection electrode 18b and a ground connection electrode 18c are prepared.

Next, as shown in FIG. 2, the SAW element 22 is fixed to the inner bottom surface of the package 11 using a die bond resin 23, and the input / output connection electrodes 16a, 16b, 18a,
18b, the ground connection electrodes 16c and 18c, the transmission and reception terminals 14b and 14a, the input / output of the phase line 12, the output terminal 12a
12b and the ground terminal 14d, respectively, and FIG.
The circuit configuration shown in FIG. Thereafter, the opening of the package 11 is sealed with the lid 25 to obtain an antenna duplexer.

In the antenna duplexer of the present embodiment, the input and output terminals 12a and 12b of the phase line 12 are
At the opposite ends of the phase line 12
The distance between the input and output terminals 12a and 12b can be increased to prevent electromagnetic interference of the transmission and reception signals between the input and output terminals 12a and 12b of the phase line 12. It will be excellent.

By providing shield electrodes 13a and 13b between the transmitting and receiving terminals 14b and 14a and the phase line 12 on the surface on which the phase line 12 is formed,
Sending and receiving between the receiving terminals 14b, 14a and the phase line 12,
Electromagnetic interference of the received signal can be prevented by the shield effect, and the isolation characteristics of the duplexer are improved.

Further, since the transmitting and receiving terminals 14b and 14a are provided at opposite ends different from the end where the antenna terminal 14c is formed, the distance between the terminals is large, and the transmitting and receiving signals between the terminals are large. Interference can be minimized, and the isolation characteristics of the duplexer can be improved.

Further, a long side line portion 12c and a folded line portion 12d forming a meander pattern of the phase line 12 are formed.
Of these, the long side line portion 12c intersects, preferably orthogonally intersects, preferably orthogonals, a straight line connecting the input and output terminals 12a and 12b of the phase line 12, thereby reducing the area of the phase line 12 close to the transmission and reception terminals 14b and 14a. Can be small, sent,
Electromagnetic interference of transmission and reception signals between the reception terminals 14b and 14a and the phase line 12 can be reduced, and excellent isolation characteristics can be obtained.

In addition, the transmitting and receiving SAW filters 20,
21 is formed on one piezoelectric substrate 15 and the transmission terminal 14b is formed.
An input connecting electrode 16a of the transmitting SAW filter 20 connected to the receiving terminal 14a and an output connecting electrode 18b of the receiving SAW filter 21 connected to the receiving terminal 14a are provided at opposite ends on the piezoelectric substrate 15, and Input connection electrode 16a of transmission SAW filter 20 connected to terminal 14b
SAW filter 21 for receiving and connecting to receiving terminal 14a
The output connection electrode 16b of the transmission SAW filter 20 connected to the input terminal 12a of the phase line 12 and the output terminal 12b of the phase line 12 are connected to the opposite end different from the end provided with the output connection electrode 18b. By providing the input connection electrode 18a of the receiving SAW filter 21 to be connected,
The input connection electrode 16a of the transmission SAW filter 20 connected to the transmission terminal 14b, the output connection electrode 18b of the reception SAW filter 21 connected to the reception terminal 14a, and the transmission SAW filter connected to the input terminal 12a of the phase line 12. 20, the distance between each of the input connection electrodes 18a of the reception SAW filter 21 connected to the output connection electrode 16b of the phase line 12 and the output connection electrode 18b of the reception SAW filter 21 increases.
Electromagnetic interference of received signals can be reduced, and an antenna duplexer having excellent isolation characteristics can be obtained.

The transmitting and receiving SAW filters 20, 2
1 connection / output connection electrodes 16a, 16b, 18a, 18
b, input and output terminals 12a, 12 of the phase line 12 corresponding to
b, the ground terminal 14d and the ground connection electrode 16c, between the wires 24 connecting the sending and receiving terminals 14b and 14a
By providing the wire 24 connecting the ground terminal 18c, the shield effect of the wire 24 connecting the ground terminal 14d and the ground connection electrodes 16c and 18c and the ground terminal 14d works, thereby reducing electromagnetic interference of transmission and reception signals. As a result, an antenna duplexer having excellent isolation characteristics can be obtained.

The phase line 12 and the transmitting and receiving terminals 14
By setting the distance from the phase line b, 14a to 300 μm or more, it is possible to prevent signal interference between the phase line 12 and the transmitting and receiving terminals 14b, 14a, and to provide excellent isolation even when the antenna duplexer is miniaturized. Characteristics are obtained.

[0047]

As described above, according to the present invention, both ends of the phase line are arranged at opposite ends of the package.
Since the distance between the input and output terminals of the phase line is large, electromagnetic interference between the terminals of the phase line can be prevented, and a compact antenna duplexer with excellent isolation characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an antenna duplexer according to an embodiment of the present invention.

FIG. 2 is a sectional view of an antenna duplexer according to an embodiment of the present invention.

FIG. 3 is a top view of the duplexer before sealing with a lid according to an embodiment of the present invention.

FIG. 4 is a bottom view of the antenna duplexer according to the embodiment of the present invention.

FIG. 5 is a circuit diagram of an antenna duplexer according to an embodiment of the present invention.

FIG. 6 is a sectional view of a conventional antenna duplexer.

FIG. 7 is a cross-sectional view of a conventional antenna duplexer.

[Explanation of symbols]

 Reference Signs List 11 package 11a first substrate 11b second substrate 11c first frame 11d second frame 12 phase line 12a input terminal 12b output terminal 12c long side line 12d folded line 13a shield electrode 13b shield electrode 14a reception terminal 14b transmission terminal 14c antenna Terminal 14d Ground terminal 15 Piezoelectric substrate 16 Connection electrode 16a Input connection electrode 16b Output connection electrode 16c Ground connection electrode 17 IDT 18 Connection electrode 18a Input connection electrode 18b Output connection electrode 18c Ground connection electrode 19 IDT 20 Transmission SAW filter 21 SAW filter for reception 22 SAW element 23 Die bond resin 24 Wire 25 Lid

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Asahi Tasaki, Inventor 1006, Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Yuji Fujinaka 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5J097 AA17 AA29 BB15 HA04 JJ07 KK10 LL07

Claims (9)

[Claims] A package formed with a transmitting / receiving terminal, an antenna terminal, and a ground terminal; a phase line formed inside the package and having one terminal connected to the antenna terminal; A transmission SAW filter having an input side connected to the transmission terminal and an output side connected to the one terminal of the phase line; a transmission SAW filter mounted in the package, and an input side connected to the other terminal of the phase line and an output side connected to the reception terminal; A receiving SAW filter connected to a terminal, wherein one terminal of the phase line is provided at the same end as the antenna terminal formed on the package,
An antenna duplexer in which the other terminal of the phase line is provided at an end facing one terminal of the phase line. 2. A transmitting and receiving terminal is provided at an end opposite to an end on which an antenna terminal is formed, and a shield is provided between the transmitting and receiving terminal and the phase line on a surface on which a phase line is formed. The antenna duplexer according to claim 1, further comprising an electrode. 3. The phase line is formed by connecting a long side line portion formed of a metal strip line and a folded line portion in a meandering manner, and a straight line connecting the long side line portion and a terminal of the phase line intersects. The antenna duplexer according to claim 1, wherein 4. A transmitting / receiving SAW filter having an interdigital transducer and a connection electrode connected to the interdigital transducer on one piezoelectric substrate, and a transmitting SAW filter connected to a transmitting terminal on the piezoelectric substrate. The connection electrode of the filter and the connection electrode of the reception filter connected to the reception terminal are located at opposite ends, and the connection electrode of the transmission SAW filter connected to the transmission terminal and the reception filter connected to the reception terminal. The transmitting SAW connected to one terminal of the phase line at an end opposite to the end where the connection electrode is formed.
2. A connection electrode of a receiving SAW filter connected to a connection electrode of the filter and the other terminal of the phase line.
An antenna duplexer according to item 1. 5. A transmitting and receiving SAW filter having an interdigital transducer and input / output connection electrodes and a ground connection electrode connected to the interdigital transducer on one piezoelectric substrate, respectively. 5. An electrical connection between the output connection electrode and the terminal of the phase line, the transmission and reception terminals of the package, and a ground interposed between these connections.
An antenna duplexer according to item 1. 6. The distance between the phase line and the transmitting and receiving terminals is 300.
The antenna duplexer according to claim 1, which is not less than μm. 7. A package in which a transmitting terminal, a receiving terminal, an antenna terminal and a ground terminal are formed, a phase line formed inside the package and having one end connected to the antenna terminal, and mounted on the input side while being mounted in the package. A transmission SAW filter having an output side connected to the transmission terminal at one end of the phase line, and a reception port mounted in the package and having an input side connected to the other end of the phase line and an output side connected to the reception terminal. An antenna duplexer comprising: a SAW filter for use; and a shield electrode between the transmitting and receiving terminals and the phase line on a surface on which the phase line is formed. 8. A package in which a transmitting / receiving terminal, an antenna terminal and a ground terminal are formed, a phase line formed inside the package and having one end connected to the antenna terminal, and a package mounted in the package and connected to the input side. A transmission SAW filter having an output side connected to the transmission terminal at one end of the phase line, and a reception port mounted in the package and having an input side connected to the other end of the phase line and an output side connected to the reception terminal. An antenna duplexer, comprising: a SAW filter for use, wherein the distance between the phase line and the transmitting and receiving terminals is 300 μm or more. 9. A package in which a transmitting / receiving terminal, an antenna terminal and a ground terminal are formed, a phase line formed inside the package and having one end connected to the antenna terminal, and a package mounted in the package and connected to the input side. A transmission SAW filter having an output side connected to the transmission terminal at one end of the phase line, and a reception port mounted in the package and having an input side connected to the other end of the phase line and an output side connected to the reception terminal. An antenna duplexer comprising: a SAW filter for use, wherein the transmitting and receiving terminals are provided at opposite ends, and the antenna terminal is provided at an end different from the end at which the transmitting and receiving terminals are provided.