JPH07249927A - Surface mounted antenna - Google Patents

Abstract

PURPOSE:To attain surface mounting, to extend the frequency band width of an antenna without interrupting its compactness and to make it possible to use the antenna for both transmission and reception by forming two feeding holes on a dielec tric substrate forming a through hole having a radiation electrode on its inner periph ery. CONSTITUTION:A hole 3 pierced from an end face 2e to an end face 2f is formed on a dielectric substrate 2 for a surface mounting type antenna 1 and a radiation electrode 4 consisting of Cu, Ag, etc., is formed on the inner periphery of the hole 3. Two feeding holes 5a, 5b are formed so as to be pierced from the bottom 2b of the base 2 up to the through hole 3 and feeding electrodes 6a, 6b consisting of Cu, Ag, etc., are formed on the inner peripheries of the holes 5a, 5b and connected to the electrode 4. The through hole 3 and a ground electrode 12 are formed on the end face 2f of the substrate 2. Feeding terminal electrodes 7a, 7b including the holes 5a, 5b are formed on a side face 2b and connected to the electrodes 6a, 6b. Fixed electrodes 8 are formed on four corner parts of the bottom 2b. The electrodes 7a, 7b, 8 formed on the bottom 2b are connected and fixed correspondingly to feeding conductors 170a, 170b, a fixing conductor 180 and a ground conductor 190 formed on the main surface 100a of a substrate 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a substrate through one surface of a dielectric substrate having a through hole having a radiation electrode formed on an inner peripheral surface thereof, and the radiation electrode is connected to the radiation electrode from a power feeding portion provided on the substrate. The present invention relates to a surface mount antenna that is fed with power.

[0002]

2. Description of the Related Art Recently, with the spread of car phones and mobile phones, there is a great demand for miniaturization of antennas used for transmitting and receiving high frequency signals.

FIG. 6 shows an embodiment of a communication device such as a mobile phone using an antenna. The antenna 10 is a dielectric loaded type monopole antenna, in which a through hole 30 is formed in a cylindrical dielectric substrate 20, and a radiation electrode 40 made of, for example, Cu is formed on the inner periphery thereof. In addition, a male connector 60 is attached to one end surface of the dielectric substrate 20 and is connected to a female connector 70 provided in the communication device main body 80 to supply power to the radiation electrode 40 and transmit / receive a high frequency signal. Is possible.

[0004]

However, in such a communication device, the antenna 10 has the communication device main body 80.
It will be placed outside of the antenna, which not only hinders miniaturization, but also external force will act directly on the antenna, which may cause problems such as deterioration of mechanical strength and durability, change of characteristics, etc. There is a nature.

Further, since a high frequency signal is transmitted and received via the connector, problems such as insertion loss and change in resonance frequency occur.

Further, the use of the connector increases the number of parts, which is not preferable in terms of workability and cost.

Therefore, as shown in FIG. 7, there has been proposed a surface mount antenna which is directly mounted on a substrate without using a connector or the like.

In the surface mount antenna 11, a through hole 33 is formed in one end surface to the other end surface of a columnar dielectric substrate 22, and a radiation electrode 44 is formed on the inner peripheral surface thereof. An end surface electrode 99 is formed on one end surface of the dielectric substrate 22 and is connected to the radiation electrode 44.

The substrate 100 is housed in a case such as a communication device main body with the surface-mounted antenna 11 mounted, and the mounting-side main surface supplies power to the surface-mounted antenna 11. Power supply line 14 as a power supply unit for
In addition to 0, signal processing circuits (not shown) such as a transmitting circuit and a receiving circuit are formed.

The surface-mounted antenna 11 is mounted on the substrate 100 via one side surface, and the end face electrode 99 and the power feeding line 140 are connected and fixed by, for example, solder or adhesive (not shown). It

A fixing electrode 88 is formed from the side surface to the bottom surface of the dielectric substrate 22, and corresponds to the fixing conductor 180 formed on the main surface of the substrate 100 on the mounting side.
Similarly, it is connected and fixed with solder, adhesive or the like (not shown).

Such a surface mount type antenna 11 is effective in that it does not require a connector and can be directly surface mounted on a substrate as compared with a conventional dielectric loaded type antenna.

Here, in the communication system using the FDMA (Frequency Division Multiplexing) system, the frequency band of the antenna that serves both transmission and reception has independent frequency bands for transmission and reception. Instead, the frequency band is one wide band including the frequency bands for transmission and reception. However, since the surface mount antenna 11 shown in FIG. 7 has a narrow frequency bandwidth, the surface mount antenna 11 having two different frequency bands is required for use in the above communication method, and as a result, There was a problem that the whole device became large.

The present invention has been made in view of the above problems, and can be surface-mounted and can be used for both transmission and reception by widening the frequency bandwidth without hindering miniaturization. An object is to provide a surface mount antenna.

[0015]

In order to solve the above-mentioned problems, the present invention is mounted on a substrate via one surface of a dielectric substrate having a through hole having a radiation electrode formed on the inner peripheral surface thereof, and the substrate is mounted on the substrate. A surface mount antenna in which power is supplied to the radiating electrode from a power supply unit provided in, and two power supply holes reaching the through hole are formed in the dielectric substrate.

Further, one of the power supply holes is used for transmission, and the other is used for reception.

Further, it is mounted on the substrate through one surface of the dielectric substrate having a through hole having a radiation electrode formed on the inner peripheral surface,
A surface mount antenna in which power is supplied to the radiation electrode from a power supply unit provided on the substrate, and two through holes are formed side by side.

Further, at least one end face of the dielectric substrate is formed with an end face electrode including each periphery of the through hole and connected to the radiation electrode, and in the end face electrode, an area of one end face electrode and It is characterized in that the areas of the other end face electrodes are different from each other.

Further, at least one end surface of the dielectric substrate is formed with an end surface electrode including each periphery of the through hole and connected to the radiation electrode, and the end surface electrode is formed.
It is characterized in that an auxiliary electrode which is not electrically connected is formed in the vicinity of one end face electrode.

Further, it is characterized in that the through holes have different hole diameters.

Further, one of the through holes is used for transmission and the other is used for reception.

[0022]

According to the present invention, since the radiation electrode formed on the inner peripheral surface of the through hole in the dielectric substrate is fed by the two feeding holes, the input impedance at each feeding position is different. Two frequency bands can be obtained with one antenna.

Further, by forming two through holes in the dielectric substrate and supplying power to each of the through holes, it becomes possible to make the resonance frequencies on the two through hole sides different and obtain two frequency bands. You can

[0024]

Embodiments of the present invention will be described below in detail with reference to FIGS. 1 to 5. The surface mount antenna 1 is
Through holes 3 are formed in the dielectric substrate 2 made of, for example, ceramics, polypropylene resin, polybutylene terephthalate resin, or polycarbonate resin from the end faces 2e to 2f. The entire inner peripheral surface of the through hole 3 is made of Cu, A or the like by, for example, a plating method or a coating of a conductive paste.
The radiation electrode 4 is formed of g, Ag-Pd, and Ag-Pt.

The surface mount antenna 1 configured as described above generates a high frequency electromagnetic field by supplying high frequency power to the radiation electrode 4, and transmits a radio wave from the radiation electrode 4. Further, the radiation electrode 4 is
Induces high-frequency current and transmits it to the transmission line.

[First Embodiment] FIG. 1 is a perspective view showing a surface mount antenna and a substrate on which the surface mount antenna according to the first embodiment of the present invention is mounted. FIG. 2 is a surface mount antenna shown in FIG. FIG. In addition to the above-described configuration, the surface mount antenna 1 has two feed holes 5a and 5b so as to reach the through hole 3 from the bottom surface 2b of the dielectric substrate 2. The entire inner peripheral surfaces of the power supply holes 5a and 5b are formed of Cu, A or the like by, for example, a plating method or a conductive paste coating.
g, Ag-Pd, Ag-Pt made of power supply electrodes 6a, 6
b is formed and connected to the radiation electrode 4.

A ground electrode 12 is provided on the end surface 2f of the dielectric substrate 2 except for a portion between the through hole 3 and the fixing electrode 8 formed on the end surface 2f side on the bottom surface 2b of the dielectric substrate 2 which will be described later. Formed and connected to the radiation electrode 4 as well.

On the bottom surface 2b of the dielectric substrate 2, a ring-shaped power supply terminal electrode 7a including the periphery of the power supply holes 5a and 5b,
7b are respectively formed and are connected to the power supply electrodes 6a and 6b.

Further, fixing electrodes 8 are provided at the four corners of the bottom surface 2b of the dielectric substrate 2. In this embodiment, the fixing electrodes 8 are formed only at the bottom surface 2b at four places, but may be formed from the bottom surface 2b to the side surfaces 2c and 2d. That is, the number and shape of the fixing electrodes 8 are appropriately selected according to the required fixing strength and the manufacturing cost.

In this embodiment, two feeding holes 5a and 5a are provided for the radiation electrode 4 formed on the inner peripheral surface of the through hole 3.
Since power is supplied from different positions depending on b,
It is possible to realize a surface mount antenna having two frequency bands with different input impedances.

Further, the inductance component of the power supply electrodes 6a and 6b formed in the power supply holes 5a and 5b contributes to the radiation, and as shown in FIG. 7, the monopole type which supplies power from the end of the radiation electrode. Compared to the surface-mounted antenna, the total length L can be shortened.

Next, the mounting state of the surface mount antenna 1 on the substrate will be described. On one main surface 100a of the mounting substrate 100, power feeding portions 110a and 110b, a fixing conductor 180, power feeding lines 140a and 140b, and a ground conductor 190 that also serves as a fixing conductor are formed.
The power supply units 110a and 110b are connected to the power supply conductors 170a and 1a.
70b, which are connected to the power supply lines 140a and 140b, respectively.

In the surface mount antenna 1, the feeding terminal electrodes 7a, 7b formed on the bottom surface 2b of the dielectric substrate 2 and the fixing electrode 8 are formed on the one main surface 100a of the substrate 100, and the feeding conductor 170a, 170b, the fixing conductor 180, and the ground conductor 190 are placed so as to correspond to each other, and are connected and fixed by, for example, solder, adhesive, or the like (not shown). As a result, power can be supplied to the radiation electrode 4, and grounding can be performed by the ground electrode 12 formed on the end surface 2f of the dielectric substrate 2.

That is, in the surface mount antenna 1, in the case of transmission, the radiation electrode 4 is transmitted from the power supply (not shown) through the power supply line 140a, the power supply conductor 170a, the power supply terminal electrode 7a, and the power supply electrode 6a. In the case of reception, the power supply electrode 6b, the power supply terminal electrode 7b, the power supply conductor 170b, and the power supply line 140b are received from the radiation electrode 4.
And is transmitted to a signal processing circuit (not shown).

In the present embodiment, the power supply holes 5a,
5b is provided on the bottom surface 2b of the dielectric substrate 2, but the top surface 2
It may be provided in a. In that case, the power supply units 110a and 110
Depending on the formation position of b, the power supply terminal electrodes 7a and 7b are formed over the side surface 2c or 2d, including the periphery of the power supply holes 5a and 5b on the upper surface 2a of the dielectric substrate 2, and in some cases formed over the bottom surface 2b. Will be done.
Further, the formation position, shape, and number of the fixing electrodes 8 are also appropriately selected according to the positions of the power supply terminal electrodes 7a and 7b.

Further, when the power feeding holes 5a and 5b are formed on the upper surface 2a of the dielectric substrate 2 as described above, the power feeding portions 110a and 110a of the substrate 100 to be mounted are selected depending on the positions where the power feeding terminal electrodes 7a and 7b are drawn out. 110b, power supply line 1
The wiring patterns such as 40a and 140b, the fixing conductor 180, and the ground conductor 190 are appropriately selected.

Furthermore, the side of the power feeding line 140a may be used for receiving and the side of the power feeding line 140b may be used as the transmitting side.

[Second Embodiment] FIG. 3 is a perspective view showing a surface mount antenna and a substrate on which the surface mount antenna is mounted according to a second embodiment of the present invention. The same parts as in the first embodiment,
Alternatively, corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted. In the second embodiment, compared with the first embodiment, the formation positions of the power supply holes 5a and 5b, the shapes of the power supply terminal electrodes 7a and 7b, the fixing electrode 8 and the mounting substrate 10 are compared.
The shape of 0 is characteristic.

That is, the power feeding holes 5a and 5b are formed so as to reach the through hole 3 from the side surface 2c of the dielectric substrate 2.
Similar to the first embodiment, the power supply electrodes 5a made of Cu, Ag, Ag-Pd, or Ag-Pt are formed on the entire inner peripheral surfaces of the power supply holes 5a and 5b by, for example, a plating method or the application of a conductive paste. 5b is formed and connected to the radiation electrode 4.

Further, the feeding hole 5 on the side surface 2c of the dielectric substrate 2
Feeding terminal electrodes 7a and 7b are formed in a portion including the periphery of a and 5b and extending over the bottom surface 2b, and are connected to the radiation electrode 4 through the feeding electrodes 6a and 6b. In addition, on the end surface 2e of the dielectric substrate 2, the entire surface except the through hole 3 is covered with the ground electrode 1
2 is formed.

Further, the fixing electrode 8 for fixing to the substrate to be mounted is formed on the side surface 2d of the dielectric substrate 2 at a position symmetrical to the power supply terminal electrodes 7a and 7b, and at two places over the bottom surface 2b. . This is to make the fixing position symmetrical so that the fixing strength against impact is constant. However, similar to the first embodiment, depending on the required fixing strength and the manufacturing cost,
It may be formed only on the side surface 2d or only on the bottom surface 2b. Also, the number and shape thereof are appropriately selected.

Also in this embodiment, since the radiation electrode 4 formed on the inner peripheral surface of the through hole 3 is fed from different positions by the feeding holes 5a and 5b, the respective input impedances are different. , A surface mount antenna with two frequency bands can be realized. Further, as in the first embodiment, one of the power supply electrodes 5a and 5b is used for transmission and the other is used for reception.

For the reason explained in the first embodiment, the total length L is larger than that of the surface mount antenna of the type shown in FIG. 7 in which power is supplied from the end of the radiation electrode.
There is also an effect that can be shortened.

Next, the mounting state of the surface mount antenna 1 on the substrate will be described. Power supply parts 110a and 110b, a fixing conductor 180, and a ground conductor 190 are formed on one main surface 100a of the mounting substrate 100. The power feeding units 110a and 110b are respectively the power feeding conductors 170.
a, 170b and power feeding holes 160a, 160b, the power feeding holes 160a, 160b are formed so as to penetrate in the thickness direction of the substrate 100, and conductors are formed on the inner peripheral surfaces thereof, respectively. The power supply lines 140a and 140b formed on the surface 100b are respectively connected.

In the surface mount antenna 1, the power supply terminal electrodes 7a and 7b and the fixing electrode 8 formed on the dielectric substrate 2 are
The power supply conductors 170a and 170b and the fixing conductor 180 formed on the one main surface 100a of the substrate 100 are placed so as to correspond to each other, and are connected and fixed by, for example, solder or adhesive (not shown). . In addition, the dielectric substrate 2
The ground electrode 12 formed on the side surface 2e of the
It is connected and fixed to the ground conductor 190 of 0.

That is, in the surface mount antenna 1, in the case of transmission, a power supply line 140a, a power supply hole 160a, and a power supply conductor 170 are supplied from a power supply (not shown).
Power is supplied to the radiation electrode 4 via a, the power supply terminal electrode 7a, and the power supply electrode 6a, and in the case of reception, the power supply electrode 6b, the power supply terminal electrode 7b, and the power supply conductor 170 from the radiation electrode 4.
The signal is transmitted to a signal processing circuit (not shown) via the power feeding hole 160b, the power feeding hole 160b, and the power feeding line 140b.

In the present embodiment, the power feed holes 5a,
Although 5b is provided on the side surface 2c of the dielectric substrate 2, the feed holes 5a and 5b may be provided on the side surface 2d, and the fixing electrode 8 may be formed on the side surface 2c.

Furthermore, the substrate 100 illustrated in this embodiment can be applied to the first embodiment. In that case, the power supply terminal electrodes 7a and 7b shown in FIG. 1 are drawn to the side surface 2c or 2d of the dielectric substrate 2, or the power supply portions 110a and 110b shown in FIG. 3 are connected to the power supply terminal electrodes 7a and 7b shown in FIG. And a fixing conductor 180 corresponding to the fixing electrode 8 may be formed.

[Third Embodiment] FIG. 4 is a perspective view showing a surface mount antenna according to a third embodiment of the present invention.
[Fig. 8] is a front view showing a modification thereof. In this embodiment also, the same parts as in the first and second embodiments, or
Corresponding parts are designated by the same reference numerals, and detailed description will be omitted. As shown in FIG. 4, two through holes 3a and 3b are formed side by side from the end surface 2e to 2f of the dielectric substrate 2, and the radiation electrodes 4a and 4b are formed on the inner peripheral surface of each of the through holes 3a and 3b.
b is formed.

Further, the end surface 2e or 2 of the dielectric substrate 2 is
The end face electrodes 9 are formed around the through holes 3a and 3b of f, respectively.
a and 9b are formed and connected to the radiation electrodes 4a and 4b. The end surface electrodes 9a and 9b also serve as power supply terminal electrodes. The end surface electrodes 9a and 9b may be formed on the bottom surface 2b of the dielectric substrate 2.

Further, although not shown, the fixing electrode for fixing to the substrate to be mounted has the same manufacturing cost as the first or second embodiment, depending on the required fixing strength. It may be formed on the end surface 2e or 2f depending on the type. Further, it may be formed on the side surfaces 2c and 2d, or may be formed from the end surface 2e, the side surfaces 2c and 2d to the bottom surface 2b. Further, the number and shape thereof are also selected appropriately. In addition, it is desirable that the fixing electrodes that are formed be formed symmetrically with the end face electrodes or with each other.

Then, by making the resonance frequency on the side of the through hole 3a different from that on the side of the through hole 3b, transmission and reception by one antenna can be realized. For example, by increasing the resonance frequency on the side of the through hole 3a and lowering the resonance frequency on the side of the through hole 3b, one side of the through holes 3a and 3b can be used for reception and the other side can be used for transmission.

FIG. 5 shows a specific example for making the resonance frequencies of the through hole 3a side and the through hole 3b side different. First, in (a), the electrode areas of the end face electrodes 9a and 9b formed on the end face 2e or 2f of the dielectric substrate 2 are made different. That is, the end surface electrode 9a on the side of the through hole 3a is connected to the through hole 3
By making it smaller than the end surface electrode 9b on the b side, a difference is generated in the capacitance component that acts on resonance (through hole 3a
Side capacitance component is smaller than the capacitance component on the through hole 3b side), the resonance frequency on the through hole 3a side is higher than the resonance frequency on the through hole 3b side, and one side of the through holes 3a, 3b is for reception. , The other side can be used for transmission.

Next, in (b), an auxiliary electrode 9c is formed in the vicinity of one end surface electrode 9b. This auxiliary electrode 9c
Is not electrically connected to anything, but the through hole 3
It acts as a capacitance component on the resonance on the b side. As a result, the resonance frequency on the through hole 3a side becomes higher than the resonance frequency on the through hole 3b side, and one side of the through holes 3a and 3b can be used for reception and the other side can be used for transmission.

Next, in (c), the through holes 3a and 3b have different hole diameters. That is, by making the hole diameter of the through hole 3a larger than the hole diameter of the through hole 3b, a difference occurs in the inductance component acting on resonance (the inductance component on the side of the through hole 3a is larger than the inductance component on the side of the through hole 3b). The resonance frequency on the through hole 3a side becomes higher than the resonance frequency on the through hole 3b side.
One side of b can be used for reception and the other side can be used for transmission.

As the substrate on which these surface-mounted antennas 1 are mounted, any substrate disclosed in the first and second embodiments may be adopted, and at least the dielectric substrate 2 is formed. It suffices that the power feeding portions corresponding to the end face electrodes 9a and 9b and the fixing electrode, the power feeding line and the fixing conductor connected thereto are formed.

In the first to third embodiments, the planar shape of the surface-mounted antenna is rectangular, but it may be square, and the through holes may extend in the longitudinal direction of the dielectric substrate. Although formed, the gist of the present invention does not change even if it is formed in the short side direction.

[0058]

According to the present invention, there is provided a surface mount antenna which can be directly mounted on a mounting board housed in a communication device such as a mobile phone without using a connector or the like, and which has a radiation function. Since the power is fed to the electrodes by the two feeding holes, the input impedances at the feeding positions are different, and one antenna can obtain two frequency bands. In addition, two frequency bands can be obtained by forming two through holes in the dielectric substrate and making the resonance frequencies on the through hole sides different.

Therefore, the antenna has a wide band width without hindering the miniaturization of the antenna, and one surface mount antenna can be used for both transmission and reception, which greatly contributes to miniaturization of a communication device such as a mobile phone. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing a surface-mounted antenna according to a first embodiment of the present invention and a board on which the surface-mounted antenna is mounted.

FIG. 2 is a cross-sectional view taken along the line XX of the surface mount antenna shown in FIG.

FIG. 3 is a perspective view showing a surface mount antenna according to a second embodiment of the present invention and a substrate on which the surface mount antenna is mounted.

FIG. 4 is a perspective view showing a surface mount antenna according to a third embodiment of the present invention.

FIG. 5 is a front view showing a modification of the third embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a conventional example of the present invention.

FIG. 7 is a perspective view showing a conventional example of the present invention.

[Explanation of symbols]

 1 Surface Mount Antenna 2 Dielectric Substrate 3 Through Hole 4 Radiating Electrode 5 Feeding Hole 6 Feeding Electrode 7 Feeding Terminal Electrodes 9a, 9b End Face Electrodes 9c Auxiliary Electrode 100 Substrate 110 Feeding Section

Claims (7)

[Claims] 1. A surface mount device, which is mounted on a substrate through one surface of a dielectric substrate having a through hole having a radiation electrode formed on an inner peripheral surface thereof, and is fed to the radiation electrode from a feeding unit provided on the substrate. A surface-mounted antenna, wherein the dielectric substrate is formed with two feeding holes reaching the through hole. 2. The surface mount antenna according to claim 1, wherein one of the feed holes is used for transmission and the other is used for reception. 3. A surface mount device, which is mounted on a substrate via one surface of a dielectric substrate having a through hole having a radiation electrode formed on an inner peripheral surface thereof, and is fed to the radiation electrode from a feeding unit provided on the substrate. A surface-mounted antenna, wherein the through-hole is formed in parallel with each other. 4. An end face electrode that includes the periphery of each of the through holes and is connected to the radiation electrode is formed on at least one end face of the dielectric substrate, and in the end face electrode, an area of one end face electrode and The surface mount antenna according to claim 3, wherein the areas of the other end face electrodes are different from each other. 5. An end face electrode that includes each periphery of the through hole and is connected to the radiation electrode is formed on at least one end face of the dielectric substrate, and one end face electrode of the end face electrodes is near the end face electrode. The surface mount antenna according to claim 3, wherein an auxiliary electrode that is not electrically connected is formed on the antenna. 6. The surface mount antenna according to claim 3, wherein the through holes have different diameters. 7. The surface mount antenna according to claim 3, wherein one of the through holes is used for transmission and the other is used for reception.