JP2001127529A - Antenna integrated type brancing filter base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna integrated type branching filter base that is miniaturized by integrally forming an antenna and a branching filter and that can suppress interference between the antenna and the branching filter. SOLUTION: The antenna integrated type branching filter base is provided with antenna bases 3a, 3b provided with an antenna element 2 on one side of a dielectric base 1, and a branching filter base 6 provided with a branching filter circuit 5 on one side or the inside of a dielectric base 4. The antenna bases 3a, 3b are integrally fitted to the front side of the branching filter base 6 where no branching filter circuit 5 is provided, the antenna bases 3a, 3b and the branching filter circuit 5 are connected by a through-conductor 7 or the like so that they can communicate a signal with each other and a ground layer 8 is interposed between an antenna element 2 of the antenna bases 3a, 3b and the branching filter circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna-integrated duplexer substrate generally used for an antenna device used for communication, and more particularly, to an antenna-integrated duplexer capable of transmitting and receiving different frequency signals. The present invention relates to a miniaturized antenna-integrated duplexer substrate.

[0002]

2. Description of the Related Art The current trend in the design of wireless communication devices is to provide devices that can handle a plurality of different systems. Such a communication device requires a wireless communication component capable of transmitting and receiving signals in a plurality of different frequency bands corresponding to each communication system. In addition, in order to keep the overall size and weight of the communication device small, it is required that each component be multifunctional and small and light.

[0003] An antenna device is one of the large components used in a wireless communication device. One method for reducing the size of the antenna is to use a resonance type antenna including an antenna element smaller than the wavelength and an impedance converter. One example is a microstrip antenna. However, the characteristics of such miniaturized antennas tend to be narrower, and when used for wireless communication devices that can support multiple systems,
The need to use multiple antennas arises. Further, even when other antennas are used, it is difficult to find a single small antenna that can be used as the frequency range to be supported by the communication device is wider.

[0004] Antennas used in wireless communication devices having individual antennas for each communication system include a plurality of power supplies for transmitting signals between each antenna and the corresponding transceiver. Wire is required. In order to reduce the size and weight of the communication device and to reduce the cost, it is desirable to share components as much as possible and reduce the number of components, and it is desirable to use a single feed line if possible even when feeding an antenna. .

[0005] A single transmission line through which a plurality of signals having different frequencies are transmitted is demultiplexed into transmission lines different for each frequency and transmitted to a plurality of antennas, or a plurality of signals having different frequencies received by a plurality of antennas are received. As a method of multiplexing a signal onto a single transmission line, for example, circuits shown in FIGS. 8 and 9 are used.

As shown in the circuit of FIG. 8, after a single transmission line 21 for transmitting a plurality of signals having different frequencies is divided into a plurality of transmission lines 22a, 22b and 22c, a filtering adapted to each signal frequency is performed. Only the signals of the respective frequencies are passed by the devices 23a, 23b and 23c, and the antenna elements 2 are passed through the respective feed lines 24a, 24b and 24c.
5a, 25b, and 25c, or as shown in FIG. 9, a single transmission line 26 for transmitting a plurality of signals having different frequencies is connected to a duplexer 27, and divided for each different frequency. A method is known in which transmission is performed to each of the antenna elements 29a, 29b, and 29c via wave feeding lines 28a, 28b, and 28c.

[0007]

In the above-described method of demultiplexing or multiplexing, the circuit shown in FIG. 8 has a disadvantage that signal power is wasted because signal power is divided. On the other hand, the circuit of FIG. 9 is advantageous in that power of the signal is not wasted.

However, when the circuit of FIG. 9 is specifically constructed, the antenna elements 29a, 29b, 29c
And the duplexer 27 are separately formed and electrically connected to each other. However, a single feeder feeds a plurality of antennas through the duplexer. If you do
If the feed line between the duplexer and the antenna is long, there is a problem that the loss of signal power increases.

On the other hand, it has been proposed to form a duplexer and an antenna on the surface of a dielectric substrate. However, if the duplexer and the antenna are provided on the same plane, the feeder line can be shortened. However, the area of the substrate is required for both the antenna and the duplexer, which is disadvantageous for miniaturization. Also, if the duplexer is too close to the antenna, interference may occur between the antenna and the duplexer circuit, resulting in deterioration of characteristics.

Accordingly, the present invention has as its main object to solve the above-mentioned problems, and specifically,
An object of the present invention is to provide an antenna-integrated duplexer substrate that can be formed compactly by integrally forming an antenna and a duplexer and that can prevent interference between the antenna and the duplexer. Is what you do.

[0011]

The present inventors have conducted various studies to solve the above-mentioned problems of the prior art, and as a result, have found that an antenna substrate provided with an antenna element and a demultiplexer provided with a demultiplexer are provided. It has been found that the above object can be achieved by integrally forming a circuit board and a ground layer between the antenna element and the branching circuit.

That is, an antenna-integrated duplexer substrate according to the present invention comprises an antenna substrate having an antenna element provided on one surface of a dielectric substrate, and a duplexer circuit provided on one surface or inside the dielectric substrate. A splitter substrate, and the antenna substrate is integrally attached to a surface of the splitter substrate on which the splitter circuit is not provided, and the antenna element and the splitter circuit are signaled. The antenna is connected so as to enable transmission, and a ground layer is interposed between the antenna element and the branching circuit.

In the above configuration, it is preferable that the demultiplexing circuit includes a directional filtering circuit including a directional coupling circuit and a ring type resonance circuit, and the demultiplexing circuit is adapted to handle a plurality of different frequencies. However, it is desirable that a plurality of directional filters having different operating frequencies be provided, and the plurality of directional filters be arranged in order of the operating frequency from the power supply side.

Further, as the ground layer, a ground layer is provided on one of the mounting surfaces of the antenna substrate or the duplexer substrate, or the antenna substrate and the duplexer substrate each have a ground layer. , The respective ground layers may be electrically connected.

Further, in the antenna substrate, a plurality of antenna elements having different operating frequencies can be provided on one surface of the dielectric substrate, and further, the operating frequencies having different operating frequencies can be provided on the surface of the splitter substrate. It is also possible to integrally attach a plurality of antenna boards each provided with an antenna element.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an antenna-integrated duplexer substrate according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of an antenna-integrated duplexer substrate according to the present invention, and FIG. 2 is a schematic perspective view thereof. The antenna-integrated duplexer substrate A shown in FIGS. 1 and 2 includes two antenna substrates 3a having antenna elements 2a and 2b provided on one surface of dielectric substrates 1a and 1b.
3b and a splitter board 6 having a splitter circuit 5 built in a dielectric substrate 4.
a, 3b and the duplexer board 6 are connected to the antenna boards 3a, 3b
Is integrally attached to the surface of the duplexer substrate 6 where the duplexer 5 is not provided.
The antenna elements 2a, 2b and the branching circuit 5 are electrically connected by the through-conductors 7a, 7b provided on the dielectric substrates 1a, 1b and the dielectric substrate 4.

The antenna substrates 3a, 3 of the duplexer substrate 6
A ground layer 8 is formed on the bonding surface of b, and is kept out of contact with the through conductors 7a and 7b. The ground layer 8 is formed on the antenna substrate 3 of the duplexer substrate 6.
The antenna substrates 3a and 3b may be formed on the joint surface of the antenna substrates 3a and 3b with the duplexer substrate 6 without being formed on the joint surfaces of the a and 3b. Can also be joined.

In the antenna substrates 3a and 3b,
A microstrip antenna is formed by the antenna elements 2a and 2b and the ground layer 8. The dielectric substrate 4
A ground layer 9 is adhered and formed on the other surface of the, and a circuit using a strip line is formed by the ground layers 8 and 9 and the branching circuit 5.

According to the present invention, since the antenna substrates 3a and 3b and the duplexer substrate 6 are joined and integrated by the above structure, the size and weight can be reduced, and a single power supply as shown in FIG. When a circuit for feeding power to a plurality of antennas from an electric wire via a duplexer is formed, the length of a feed line between the duplexer and the antenna, that is, the length of the through conductor 7 can be reduced, so that signal power loss is reduced. Can be reduced. Further, since the ground layer 8 is interposed between the antenna elements 2a and 2b and the branching circuit 5, the electromagnetic fields radiated from the antenna elements 2a and 2b and the electromagnetic field of the branching circuit 5 interfere with each other. And the deterioration of the characteristics can be avoided.

In the present invention, a known circuit can be used as the demultiplexing circuit 5, and a specific example of the circuit pattern is shown in FIG. The demultiplexing circuit 5
It has a directional filtering circuit x composed of directional coupling circuits a and b and a ring type resonance circuit c, and the number of directional filtering circuits is adjusted by the number of signals to be demultiplexed. Sex filtering circuits x1 and x2 are provided.

In the demultiplexing circuit 5 of FIG. 3, first,
One signal f1 of the two signals f1 and f2 having different frequencies input from the port 10 on the transceiver side is
At the frequency determined by the directional coupling circuit a1 and the ring-type resonance circuit c1 in the first directional filtering circuit x1 from the transmission line 11, the directional coupling circuit a1 couples to the ring-type resonance circuit c1 and further forms the other. The other directional coupling circuit b1 is coupled to the other transmission line 12 and transmitted to the antenna element 2a via the through conductor 7a serving as a feed line.

The other signal f2 further travels through the transmission line 11 and passes through the directional coupling circuit a in the next directional filtering circuit x2.
2, a directional coupling circuit a2 and a ring-type resonance circuit c2
Ring-type resonance circuit c2 at a frequency determined by
And is coupled to the other transmission line 13 by the other directional coupling circuit b2 and transmitted to the antenna element 2b via the through conductor 7b serving as a feed line.

The two directional filtering circuits x1, x
The frequency components not demultiplexed at 2 pass through the transmission line 11. For example, if the frequency components are unnecessary components such as harmonic components generated by a mixer circuit or an amplifier, the transmission line 1
An attenuator or the like is provided at the end of 1 to attenuate. In addition, a third signal can be included in the frequency components that have not been separated by the two directional filtering circuits x1 and x2. In this case, the end of the transmission line 11 is connected to a third antenna element (see FIG. (Not shown).

When the signals input from the port 10 include three or more signals having different frequencies, the directional filtering circuits corresponding to the numbers are sequentially provided as in FIG. Good.

In the demultiplexing circuit 5, it is desirable that the plurality of directional filtering circuits x1 and x2 are arranged in the order of the operating frequency from the port 10 side. When this is arranged in reverse, the higher-order resonance in the first directional filtering circuit x1 operating at the low frequency f1 causes the signal component of the higher frequency f2 to leak to the directional filtering circuit x1, and This is because there is a possibility that the arranged second directional filtering circuit x2 may be prevented from correctly extracting the signal f2.

In the resonance circuit shown in FIG. 3, a signal coupled to the ring-type resonance circuits c1 and c2 and coupled to the other transmission lines 12 and 13 travels in the direction of the through conductors 7a and 7b serving as power supply lines. No transmission is performed in the direction opposite to the transmission lines 12 and 13.

In the antenna-integrated duplexer board A shown in FIGS. 1 and 2, the branching circuit 5 is provided inside the dielectric substrate 4, but according to the present invention, as shown in FIG. Demultiplexer 5
Can be formed on the surface of the dielectric substrate 4 opposite to the joint surface with the antenna substrate 3.

That is, as shown in FIG. 4, a demultiplexing circuit 5 is provided on the surface of the dielectric substrate 4 on the side opposite to the bonding surface with the antenna substrate 3.
The antenna element 2 and the demultiplexing circuit 5 are connected to the through conductors 7 penetrating the dielectric substrate 1 and the dielectric substrate 4.
Are electrically connected by Further, since the ground layer 8 is formed on the junction surface of the duplexer substrate 6 with the antenna substrate 3, interference between the antenna element 2 and the duplexer 5 can be prevented.

Further, in FIGS. 1 to 4, a plurality of antenna substrates 3 are integrally formed on the surface of the duplexer substrate 6, but as shown in a schematic perspective view of FIG. It may be formed on the surface of one dielectric substrate 1.

In the present invention, the antenna substrate 3 and the duplexer substrate 6 can be integrally joined to the ground layer 8 of the duplexer substrate 6 with an adhesive or the like. When the dielectric substrates 1 and 4 are made of ceramics, the antenna substrate 3 and the duplexer substrate 6 can be integrated by firing.

The through conductor 7 can also be formed by filling the holes formed in the dielectric substrates 1 and 4 with a conductor or burying metal pins. When the dielectric substrate is made of ceramics, the antenna elements are formed by applying the metal paste and filling the through holes with the ground layers 8 and 9 and the branching circuit 5 by simultaneously firing the dielectric substrate. It is also possible.

The method of feeding power from the branching circuit 5 to the antenna element 2 is not limited to the formation of the through conductor 7. For example, a slot is provided in the ground layer 8, and the transmission line between the antenna element 2 and the branching circuit 5 is provided. 12, 13 can be electromagnetically coupled.

According to the antenna-integrated duplexer board of the present invention, at least one signal split into at least two or more by the splitter board 6 is an antenna integrated with the duplexer board 6. It is sufficient that the signal is connected to the antenna element of the substrate 3, and the other split signal can be connected to a known external antenna element such as a wire antenna.

In the antenna-integrated duplexer substrate according to the present invention, the dielectric substrates 1 and 4 are made of a ceramic material such as alumina, glass, glass ceramics or aluminum nitride, or an organic insulating material containing an organic resin such as epoxy resin. Alternatively, it can be formed of a known insulating material such as an organic-ceramic composite material. The antenna element 2, the ground layers 8, 9 and the demultiplexing circuit 5 are made of copper,
It is formed of a known conductive material such as silver, gold, tungsten, and molybdenum.

The dielectric substrate 1 of the antenna substrate 3 and the dielectric substrate 4 of the duplexer substrate 6 may be formed of the same dielectric material.
A dielectric material having an appropriate dielectric constant may be appropriately selected in consideration of a demand for miniaturization, processing accuracy, and radiation efficiency.

Evaluation and analysis were performed on the demultiplexing characteristics of the demultiplexing circuit described with reference to FIG. 3, and the results are shown in FIG. In the evaluation, the circuit of FIG. 3 made of copper was formed in the dielectric substrate 4 having a dielectric constant of 4.9. As is clear from FIG. 7, the signal of frequency 2.5 GHz and the frequency of frequency 5.8 GHz were separated.

[0038]

As described above in detail, according to the antenna-integrated duplexer substrate of the present invention, a signal containing a plurality of different frequencies can be fed to a plurality of antennas using one feeder line. The antenna and the duplexer can be integrated without interfering with each other, so that the length of the feed line can be minimized and the size and weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view for explaining one embodiment of an antenna-integrated duplexer substrate of the present invention.

FIG. 2 is a schematic perspective view of the antenna-integrated duplexer substrate of FIG.

FIG. 3 is a pattern diagram for explaining a branching circuit in the antenna-integrated branching filter substrate of the present invention.

FIG. 4 is a schematic cross-sectional view for explaining another embodiment of the antenna-integrated duplexer substrate of the present invention.

FIG. 5 is a schematic sectional view for explaining still another embodiment of the antenna-integrated duplexer substrate of the present invention.

FIG. 6 is a schematic perspective view of the antenna-integrated duplexer substrate of FIG. 5;

7 shows a result of evaluation and analysis of demultiplexing of the demultiplexing circuit of FIG.

FIG. 8 shows a conceptual diagram of a circuit with an antenna and a demultiplexing circuit.

FIG. 9 is a conceptual diagram of another circuit including an antenna and a demultiplexing circuit.

[Explanation of symbols]

 1a, 1b, 4 Dielectric substrate 2a, 2b Antenna element 3, 3a, 3b Antenna substrate 5 Demultiplexing circuit 6 Demultiplexer substrate 7a, 7b Through conductor 8, 9 Ground layer x1, x2 Directional filtering circuit a1, a2 b1, b2 Directional coupling circuit c1, c2 Ring-type resonance circuit A Antenna-integrated duplexer board

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J006 HB16 HB21 JA01 LA01 LA22 NC02 PB00 5J021 AA05 AA09 AA13 AB06 CA03 FA23 FA32 HA05 JA03 JA07 5J045 AA03 AA05 AB05 DA10 EA08 HA03 JA12 MA01 MA07

Claims (8)

[Claims] An antenna element provided with an antenna element on one surface of a dielectric substrate; and a duplexer substrate provided with a splitter circuit on one surface or inside of the dielectric substrate. The antenna substrate is integrally attached to the surface of the duplexer substrate on which the duplexer is not provided, and the antenna element and the duplexer are connected so as to enable signal transmission, and An antenna-integrated duplexer substrate, wherein a ground layer is interposed between an antenna element and said branching circuit. 2. The antenna-integrated duplexer board according to claim 1, wherein said branching circuit includes a directional filtering circuit including a directional coupling circuit and a ring-type resonance circuit. 3. The demultiplexing circuit according to claim 2, further comprising a plurality of directional filtering circuits having different operating frequencies.
An antenna-integrated duplexer substrate as described in the above. 4. The antenna-integrated duplexer board according to claim 3, wherein the plurality of directional filtering circuits are arranged in order of operating frequency from a power supply side. 5. A ground layer is provided on one of the mounting surfaces of the antenna substrate or the duplexer substrate.
An antenna-integrated duplexer substrate as described in the above. 6. The antenna-integrated duplexer according to claim 1, wherein the antenna substrate and the duplexer substrate each include a ground layer, and the ground layers are electrically connected to each other. substrate. 7. The antenna according to claim 1, wherein a plurality of antenna substrates provided with antenna elements having different operating frequencies are integrally attached to a surface of the duplexer substrate.
An antenna-integrated duplexer substrate as described in the above. 8. The antenna-integrated duplexer substrate according to claim 1, wherein a plurality of antenna elements having different operating frequencies are provided on one surface of said dielectric substrate.