JPH04103209A - Magnetic field coupling type diplexer - Google Patents

Abstract

PURPOSE:To obtain an excellent characteristic regardless of small size by arranging a capacitor electrode pattern so as to be inserted between GND electrode patterns. CONSTITUTION:GND electrode patterns 2-4 respectively form capacitor ground side electrodes and are formed opposite to each of capacitor electrode patterns in a lamination direction. Moreover, the GND electrode patterns 2-4 sandwich each of the capacitor electrode patterns vertically for shielding. A prescribed part of the GND electrode patterns 2-4 is connected by a blind through hole and grounded. Thus, the small sized diplexer with an excellent characteristic is easily obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a two-magnetic field combination type dibrelexer, which is used in portable radios, cordless phones, etc. 0 [Conventional technology] Regarding a magnetically coupled diplexer that has been implemented to reduce its size [Prior art] Figure 5 shows an example of a circuit of a conventional diplexer.
Ll to L3 are coils, and Ct to Cs are capacitors.

ANT indicates an antenna side terminal (common terminal), Rx indicates a receiving side terminal (individual terminal), and Tx indicates a transmitting side terminal (individual terminal).

Conventionally, as a deplexer. Various types of duplexers were used, but the one shown in Figure 5 is a known general duplexer circuit.For example, the Q-diplexer is used when one antenna is shared between the transmitting part and the receiving part. It is used for multiple coils L1 to L3 and multiple capacitors 0.
It is composed of 1 to C3. The coil L1 and the capacitor C1, and the coil L2 and the capacitor C2 constitute parallel resonant circuits (high frequency filters) each having a different resonance frequency.

Now, the resonant frequency of the parallel resonant circuit consisting of coil Ll and capacitor Cl is /1, and the resonant frequency of the parallel resonant circuit consisting of coil L2 and capacitor C2 is ! , then f
1 and f2.

With this setting, the signal of frequency j1 is passed between the antenna terminal ANT and the transmitting terminal Tx, and
The signal of frequency 72 (j1←/2) is blocked, and the antenna terminal ANT and the receiving terminal R. In between, frequency! 2 signals of frequency j1 are passed through, and signals of 2 frequencies j1 are blocked.

By the way, many of the diplexers conventionally used in portable radios, cordless phones, etc. utilize dielectric filters. Such a diplexer has a configuration in which two dielectric resonators are provided, one for each frequency on the transmitting side and the other on the receiving side.

In addition to downsizing the replexer (2. with a shield structure).

The object of the present invention is to easily obtain a diplexer having good characteristics.

[Problem to be solved by the invention]

The above-mentioned conventional devices had the following drawbacks.

(1) When a diplexer is constructed using a dielectric resonator, it is difficult to downsize it.

That is, if λ0 is the free space wavelength of the target frequency and ε is the specific electric current coefficient of the dielectric material, at least one side of the resonator is λo / 4 v'i from the resonance principle of a dielectric resonator.
It cannot be made smaller than r.

(2) In order to prevent mutual interference between the two resonators that make up the duplexer and to prevent mutual interference between other circuits, it is also possible to use a shield structure or increase the distance between the resonators. but.

In any case, it is difficult to miniaturize the deplexer and the cost increases.

The present invention eliminates these conventional drawbacks and solves the problems. In order to achieve the above object, the present invention is constructed as follows.

(1) Two connected capacitor electrode patterns are integrally provided on any internal layer of the multilayer board.

Coil patterns are integrally provided on both sides of the capacitor electrode pattern.

Two resonant circuits on the common terminal side are constructed by providing GND electrode patterns on both sides of the layers sandwiching the internal layer, facing the capacitor electrode pattern in the stacking direction.

Another internal layer is provided with two capacitor electrode patterns each connected to an individual terminal, and a coil pattern is provided integrally (=
In addition to establishing two separate layers of rehabilitation.

Facing the above capacitor electrode pattern in the lamination direction,
Providing a GND electrode pattern (from 2).

Configure two resonant circuits on the individual terminal side.

The coil pattern forming the resonant circuit on the common terminal side is magnetically coupled to the coil pattern forming the resonant circuit on the individual terminal side.

A magnetic field coupling type diplexer characterized in that each of the capacitor electrode patterns described above is arranged so as to be sandwiched between GND electrode patterns.

(2) A plurality of sets of layers forming two resonant circuits on the individual terminal side are provided, and among the respective coil patterns provided in the plural sets of layers, magnetic field coupling is established between the coils facing each other in the lamination direction. The magnetic field coupling type diplexer according to (1) above.

[Effect]

Since the present invention is configured as described above, it has the following secondary effects.

A signal (radio wave) input from the common terminal (for example, antenna side terminal) is first input to the common terminal side resonant circuit.

Then, due to the magnetic coupling between the coil of this resonant circuit and the coil of the 1st individual terminal side resonant circuit, which is the primary stage resonant circuit, 2
Signals are sent to individual terminals.

Also, contrary to the above, the signal input from the two individual terminals is sent from the two individual terminal side resonant circuit to the common terminal side resonant circuit by magnetic field coupling, and is output to the common terminal. Even if several (K is any integer greater than or equal to 3) resonant circuits are provided between them.

Similar to the above, signals are sent by magnetic field coupling between adjacent resonant circuits.

A diplexer uses this kind of magnetic field coupling.

Since it can be constructed from a thick film pattern formed in the stacking direction of a multilayer substrate, a small diplexer with good characteristics can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to Drawing 1.0 Figures 1 and 2 are diagrams showing the first embodiment of the present invention, and Figure 1 is an example of a circuit of a diplexer.

Figure 2 shows an example of mounting on a multilayer board (Figure A is an exploded perspective view, Figure B is an exploded perspective view,
The figure is a sectional view taken along the X-Y line.

In the figure e Lll p L12 w LH* L
22 is a coil, C1l.

C12v C21p C22 is a capacitor, ANT
is the antenna side terminal (common terminal), TI is the transmitting side terminal (individual terminal), RX is the receiving side terminal (individual terminal), 1-1
~1-5 are each layer (green sheet) of the multilayer board.

2.3.4 is a GND electrode pattern, 5, 6, 9° 10 is a coil pattern, 7, 8, 11, 12 is a capacitor electrode pattern, and 13 is a common terminal side connection part.

In this embodiment, the diplexer circuit shown in FIG.
A multilayer substrate (for example, a ceramic multilayer substrate) is mounted to form a diplexer as shown in FIG.

The diplexer circuit includes two resonant circuits that are magnetically coupled to each other between the antenna side terminal (common terminal) ANT and the transmitting side terminal (individual terminal) TI. (Individual terminals) Two resonant circuits magnetically coupled to each other are also provided between Rx.

That is, between the antenna side terminal ANT and the transmission side terminal TI (
- is provided with a resonant circuit consisting of a coil Lit and a capacitor C1l, and a resonant circuit consisting of a coil L12 and a capacitor C12, and magnetic field coupling (
M), and a resonant circuit consisting of a coil L21 and a capacitor C21 and a resonant circuit consisting of a coil L22 and a capacitor C22 are provided between the antenna side terminal ANT and the receiving side terminal R1, and the coils L21 and L22 are magnetically coupled. let

In this case, the resonant frequency of the resonant circuit provided between the antenna side terminal ANT and the transmission side terminal TI and the antenna side terminal ANT
The resonant frequency of the resonant circuit provided between the receiver terminal R1 and the receiver terminal R1 is set to a different frequency.

In addition, the connection point of each magnetically coupled resonant circuit is grounded.

When the diplexer circuit shown in FIG. 1 is mounted on a multilayer board, it becomes as shown in FIG. 2. In the example shown in FIG. 2, the multilayer board has five layers, and a coil pattern, a capacitor electrode pattern, etc. are formed as thick film patterns on each layer (formed by printing), and predetermined portions are connected.

On the first layer (surface layer) 1-1 constituting the multilayer substrate (= represents a GND electrode pattern (ground electrode pattern) 2 and a ground terminal G formed integrally with this GND electrode pattern 2)
ND, antenna side terminal ANT.

A transmitting side terminal Tx and a receiving side terminal Rx are formed.

Two capacitor electrode patterns 7.8 and a coil pattern 5.6 are integrally formed on the second layer 1-2, and a common terminal side connection portion 13 is provided at the connection portion of the two capacitor electrode patterns. will be established.

Capacitor electrode pattern 7 corresponds to the electrode (non-grounded electrode) connected to antenna side terminal ANT of capacitor C1l shown in FIG. 1, and coil pattern 5 corresponds to coil L1.
Corresponds to 1. Further, the capacitor electrode pattern 8 corresponds to the electrode (non-grounded electrode) connected to the antenna side terminal ANT of the capacitor C21, and the coil pattern 6 corresponds to the coil L21.

Further, the common terminal side connecting portion 13 is connected to the antenna side terminal ANT formed on the first layer 1-1.

A GND electrode pattern (ground electrode pattern) 3 is formed on the third layer 1-3, and a capacitor electrode pattern 11. A coil pattern 9 is formed integrally with this capacitor electrode pattern 11, and a capacitor electrode pattern 12. and a coil pattern 1 integrally formed with this capacitor electrode pattern 12
0.

The capacitor electrode pattern 11 is the capacitor C in FIG.
The coil pattern 9 corresponds to the electrode connected to the transmitting terminal T of I2, and the coil pattern 9 corresponds to the coil L12. Further, the capacitor electrode pattern 12 corresponds to the electrode connected to the receiving terminal RX of the capacitor Cw, and the coil pattern 10
corresponds to coil L22.

Furthermore, a GND electrode pattern 4 is formed on the fifth layer 1-5.

When forming each of the above-mentioned coil patterns, it is preferable to set the length of the L element to about one turn since it is not possible to make the wiring of the L element very large in the high frequency band.

The GND electrode patterns 2, 3.4 each constitute a ground side electrode of a capacitor, and are formed to face each capacitor electrode pattern in the stacking direction. Each capacitor electrode pattern is sandwiched and shielded from above and below by the GND electrode pattern.

Predetermined portions of these GND electrode patterns 2, 3.4 are connected by blind through holes (through holes whose interiors are filled with a conductor) and are grounded.

Coil pattern 5 (corresponding to coil Lll), coil pattern 9 (corresponding to coil LL21), coil pattern 6 (corresponding to coil L21), and coil pattern 10 (corresponding to coil L) are laminated layers of multilayer substrates, respectively. They are formed facing each other and connected to each other (two worlds).

In this case, between coil Lit and L12, and between coil L22
It is sufficient to perform magnetic coupling only between and In2, and it is necessary to prevent magnetic interference between other coils. For this reason.

Between coil patterns 5 and 6, and between coil patterns 9°10
A capacitor electrode pattern is formed between each of them, thereby preventing the above-mentioned unnecessary magnetic interference.

3 and 4 are diagrams showing a second embodiment of the present invention, and FIG. 3 shows an example of a diplexer circuit.

FIG. 4 is a diagram showing an example of mounting on a multilayer board.

In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same elements. shows each layer (green sheet) of the multilayer board.

In this embodiment, the diplexer circuit shown in FIG.
A multilayer board (= mounted to form a diplexer as shown in Figure 4).

The diplexer circuit is connected between the antenna side terminal (common terminal) ANT and the transmitting side terminal (individual terminal) Tx, and between the antenna side terminal ANT and the receiving side terminal Rx (K is any integer of 3 or more). ) LC resonant circuit is provided.

Then, the adjacent coils of the resonators provided between the antenna side terminal ANT and the transmitting side terminal T8 are magnetically coupled to each other, and the antenna side terminal ANT and the receiving side terminal R,
0 or more magnetic field coupling between adjacent coils of each resonator provided between the two. The two resonant circuits are grounded as shown in the figure. When the circuit shown in Fig. 3 is mounted on two multilayer boards, the result is shown in Fig. 4.

In the example shown in FIG.
(see figure).

Then, a resonant circuit on the individual terminal side consisting of a capacitor and a coil provided in the fourth layer 1-4 and the fifth layer 1-5 is set as one set, and multiple sets of layers having the same configuration as this set are formed in the stacking direction. and connect the specified parts.

In other words, the 9 individual terminal side resonant circuit (#K) is the 1st-(n
-1) On the layer, one capacitor electrode pattern 1l-K
(C1 section: = equivalent) and this capacitor electrode pattern 1
Coil pattern 9-K (L
(equivalent to l).

The other capacitor electrode pattern 12-K (corresponding to C, ζ2) and a coil pattern 1O-K (corresponding to L) integrally formed with this capacitor electrode pattern 12- are provided.

Further, the 1-n layer is provided with a GND electrode pattern 4-K, and this GND electrode pattern is arranged to face the capacitor electrode patterns 11- and 12- in the stacking direction; Connect the specified parts.

Although the embodiments have been described above, the present invention can also be implemented in the following manner.

(1) The number of layers of the applied multilayer board may be arbitrary, and the diplexer may be placed inside the multilayer board (consisting of only internal layers)
.

Also, only the top layer may be the surface layer of the multilayer board (2) The number of individual terminal side resonant circuits may be any number (0 (3)
) The number of turns in the coil is not limited to one turn.

It is also possible to increase the number depending on the design. Furthermore, it is also possible to make the capacitor section multi-layered depending on the situation.However, it is preferable that the GND layer of the capacitor section be located at the outermost part of the resonant section.

〔Effect of the invention〕

As explained above, the two inventions have the following effects.

(1) Since a conventional dielectric filter is not used, a compact diplexer can be obtained.

(2) Multilayer board: = The formed coil pattern is 1
This is because the coil patterns of the first and second stage resonant circuits can be placed close to each other, although it is about the same size as a single tangent.

(3) By adjusting the thickness of each layer constituting the multilayer board and the area of the capacitor electrode pattern, the resonant frequency etc. can be easily adjusted and a duplexer with good characteristics can be obtained. .

(4) It is also possible to easily improve the two-pass band characteristics by increasing the number of resonant circuits.

In this case, since a resonant circuit is simply added in the stacking direction of the multilayer substrate, a small diplexer with good characteristics can be obtained.

(5) When constructing a diplexer, the GND electrode pattern allows the entire diplexer to be placed in a sandwich-like state. Therefore, a diplexer with a complete shield structure can be created, and the influence of stray capacitors etc. can be prevented.

Design and manufacture are also facilitated.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams showing a first embodiment of the present invention. Figure 1 shows an example of a diplexer circuit. FIG. 2 is a diagram showing an example of mounting on a multilayer board. FIGS. 3 and 4 are diagrams showing a second embodiment of the present invention. Figure 3 is an example of a diplexer circuit. FIG. 4 is a diagram showing an example of mounting on a multilayer board.0 Further, FIG. 5 is a diagram showing an example of a circuit of a conventional diplexer. Luxl'L1 section, L21~L, K...coil. Static C1l~cttt C2t~C2 supervisor...Capacitor. 1-1 to 1-K...Each layer (green sheet) of a multilayer board. 2.3, 4.4-1 to 4-K...GND electrode pattern. 5.6, 9, 10.9-1 to 9-K. 10-1 to 10-K...Coil pattern. 7.8.11-1~11-4°12-1~12-K...Capacitor electrode pattern. Patent Applicant: TDC Co., Ltd. Representative Patent Attorney: Tatsuo Imamura (1 other person) β: Input - Y force direction er surface diagram Convergence to the eyebrow board Figure 2 Rough 9 and cup circulation row 1 Figure te) Alephtha θ Other circuit examples Figure 3 Oane Δ town to M board Figure 4

Claims (2)

[Claims] (1) Two capacitor electrode patterns (7, 8) connected to a common terminal (ANT) are integrally provided on any internal layer (1-2) of the multilayer board, and the capacitor electrode patterns (7, 8) are connected to a common terminal (ANT). ) on both sides of the coil pattern (5,
6) is integrally provided, and the layers (1-1, 1-3) on both sides sandwiching the above-mentioned inner layer (1-2).
), two resonant circuits on the common terminal (ANT) side are constructed by providing GND electrode patterns (2, 3) facing the capacitor electrode patterns (7, 8) in the stacking direction, respectively. Another internal layer (1-4) has two
Coil patterns (9, 10) are integrally provided on both sides of the capacitor electrode patterns (11, 12), and another layer (
1-5), two resonant circuits on the individual terminal (T_x, R_x) side are configured by providing a GND electrode pattern (4) facing the capacitor electrode pattern (11, 12) in the stacking direction. The coil pattern (
5, 6) and a coil pattern (9, 10) constituting a resonant circuit on the individual terminal side, and each of the capacitor electrode patterns described above is arranged so as to be sandwiched between GND electrode patterns. Combined diplexer. (2) Multiple sets (1-4, 1-5 to 1-(
n-1), 1-n), and each coil pattern (9-n) provided in these multiple sets of layers.
1 to 9-k and 10-1 to 10-k), the coils facing each other in the stacking direction are magnetically coupled to each other.