JP2007129360A - Dielectric antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric antenna that can be made more compact by eliminating the need for extending the length of an antenna electrode even when an inductor L of a matching circuit is increased. <P>SOLUTION: The dielectric antenna 1 is constituted such that the antenna electrode 1b is formed on the front face of a plate-like dielectric body 1a, a ground electrode 3 connected to the antenna electrode 1b is formed on a desired position of a side face of the dielectric body 1a as the inductor L, and a feeding electrode 2 is formed on the rear face opposed to an end 1d of the antenna electrode 1b as a capacitor C to thereby form the matching circuit comprising the capacitor and the inductor integrated with the dielectric antenna 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dielectric antenna used for ultra-short wave, quasi-microwave, microwave, and millimeter wave wireless communications, and more particularly to a dielectric antenna having a matching circuit in a dielectric.

  The antenna of a wireless communication device typified by a mobile phone should be as small as possible as long as the characteristics can be obtained. The size of the antenna is required to be smaller than before, and a small antenna is still required.

For the miniaturization of the antenna, the techniques shown in the following techniques 1 and 2 can be given as typical ones.
Technology 1: Manufacture of a laminated antenna with a three-dimensional electrode by making the antenna part a laminated structure
Technology 2: Dielectric antenna using a dielectric material aiming at a wavelength shortening effect The above-described technology is effective but has problems.

  The laminated structure of technology 1 generally achieves miniaturization at a frequency of 800 MHz or higher due to the use of a material having a low dielectric constant, but a frequency band below that, such as a telemeter, a telecontroller, In the 300 MHz band weak radio and 400 MHz band specific low power radio used for the transceiver, it is necessary to increase the antenna electrode length, and it is difficult to reduce the size. In addition, since the laminated structure is adopted, there are many manufacturing processes and initial costs at the time of manufacturing are required, so that it can be applied to mass-produced items, but it cannot be applied to smaller items.

  In Technology 1 and Technology 2, there is a problem that impedance mismatch occurs between the antenna and the transmission circuit, and the antenna radiation efficiency deteriorates.

  In order to keep the impedance of the antenna equivalent to that of the transmission circuit, the antenna shown in the technique 1 needs to be widened to a certain extent, and the antenna shown in the technique 2 needs to use a low dielectric constant material. For this reason, there is a limit to downsizing.

  In order to solve this problem, the countermeasures shown in Patent Documents 1 to 3 below are taken.

  In order to solve the mismatching, the technique disclosed in Patent Document 1 is provided with an LC matching circuit between an antenna and a circuit, so that a dielectric antenna and a matching circuit are mounted on the same substrate. It is effective to reduce the size of the machine. However, even though the size is reduced, the area of the board used for mounting the LC matching circuit increases, and the number of parts increases, so that it can sufficiently meet the further size reduction required for wireless communication devices. I can't.

  In the technique disclosed in Patent Document 2, the shape of the antenna electrode is spiral or meandered, this portion is used as an inductor L, the antenna electrode end is opened, and this portion and GND are used as a capacitor C, thereby impedance matching. It is a method to take. This method also has a problem. When the inductor L is increased by impedance matching, it is necessary to increase the number of windings or the electrode length. Therefore, it cannot be said that it is sufficient for further miniaturization, and there is a problem that the cost increases when the electrode length becomes long.

The technique disclosed in Patent Document 3 is a laminated antenna that enables integration with an antenna by forming a matching circuit in a layer different from the radiation electrode. However, this method also has a problem, and when the inductor L is increased by impedance matching, it is necessary to increase the electrode length. Therefore, it cannot be said that it is sufficient for further downsizing. In addition, there is a problem that the electrode length becomes long and causes cost increase.
JP 2002-26624 A JP-A-11-27025 JP 2004-221661 A

  The problem to be solved by the present invention is to realize further miniaturization of the antenna by eliminating the need to increase the electrode length even when the inductor L of the matching circuit is increased.

  The antenna of this invention exists in solving the problem shown by the said technique.

  In the antenna of the present invention, the antenna is miniaturized by using a high dielectric constant material for the antenna substrate, and the specific method is shown below.

  The dielectric antenna of the present invention is formed by forming spiral antenna electrodes having various shapes such as a rectangular shape, a circular shape, a triangular shape, and a polygon shape on the surface of a single plate-shaped dielectric substrate. A ground electrode connected to the antenna electrode is formed at a desired position on the side surface of the dielectric, and this is used as an inductor L. A feeding electrode is formed on the back surface opposite to the end of the antenna electrode, and this is used as a capacitor C. The problem of the previous term is solved by forming a matching circuit consisting of a capacitor and an inductor integrated with a body antenna. When it is necessary to increase the capacitance value of the capacitor C in order to match the impedance of the antenna and the transmission circuit, the area of the feed electrode that forms the capacitor C is increased, or the distance between the antenna electrode and the feed electrode that forms the capacitor C is increased. By contracting, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the capacitance of the capacitor C, the impedance of the antenna and the transmission circuit can be reduced by reducing the area of the feeding electrode that forms the capacitor C or by separating the distance between the antenna electrode and the feeding electrode that forms the capacitor C. Can be consistent. When it is necessary to increase the value of the inductor L in order to match the impedance of the antenna and the transmission circuit, the position of the ground electrode that forms the inductor connected to the antenna electrode is moved away from the end of the antenna electrode to be fed. By changing, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the value of the inductor L, the position of the ground electrode forming the inductor connected to the antenna electrode is changed in a direction closer to the end of the antenna electrode to be fed, so Impedance matching of the circuit can be taken.

  In addition, a spiral antenna electrode having various shapes such as a rectangular shape, a circular shape, a triangular shape, and a polygonal shape is formed on the surface of one plate-shaped dielectric substrate, and the side surface of this plate-shaped dielectric material is formed. A feeding electrode connected to the antenna electrode is formed, a ground electrode connected to the antenna electrode is formed at a desired position on the side surface of the plate-like dielectric, and this is used as an inductor L. At the desired position of the antenna electrode A dielectric antenna obtained by forming a grounding electrode on the opposite back surface and using this as a capacitor C and forming a matching circuit composed of a capacitor and an inductor integrated with the dielectric antenna has the same effect. When it is necessary to increase the value of the inductor L in order to match the impedance of the antenna and the transmission circuit, the position of the ground electrode that forms the inductor connected to the antenna electrode is moved away from the end of the antenna electrode to be fed. By changing, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the value of the inductor L, the position of the ground electrode forming the inductor connected to the antenna electrode is changed in a direction closer to the end of the antenna electrode to be fed, so Impedance matching of the circuit can be taken. When it is necessary to increase the capacitance value of the capacitor C in order to match the impedance of the antenna and the transmission circuit, the area of the ground electrode that forms the capacitor C is increased or the distance between the antenna electrode and the ground electrode that forms the capacitor C is increased. By contracting, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the capacitance of the capacitor C, the impedance of the antenna and the transmission circuit can be reduced by reducing the area of the ground electrode that forms the capacitor C or increasing the distance between the antenna electrode and the ground electrode that forms the capacitor C. Can be consistent.

  Furthermore, a spiral antenna electrode having various shapes such as a rectangular shape, a circular shape, a triangular shape, and a polygonal shape is formed on the surface of one plate-shaped dielectric substrate, and is formed on the side surface of the plate-shaped dielectric material. A feeding electrode connected to the antenna electrode is formed, a ground electrode connected to the antenna electrode is formed at a desired position on the side surface of the plate-shaped dielectric, and this is used as an inductor L, and the side surface of the plate-shaped dielectric is formed. A similar effect can be obtained even in a dielectric antenna in which a grounding electrode facing the power feeding electrode is formed at a desired position and this is used as a capacitor C, and a matching circuit including a capacitor and an inductor integrated with the dielectric antenna is formed. When it is necessary to increase the value of the inductor L in order to match the impedance of the antenna and the transmission circuit, the position of the ground electrode that forms the inductor connected to the antenna electrode is moved away from the end of the antenna electrode to be fed. By changing, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the value of the inductor L, the position of the ground electrode forming the inductor connected to the antenna electrode is changed in a direction closer to the end of the antenna electrode to be fed, so Impedance matching of the circuit can be taken. When it is necessary to increase the capacitance value of the capacitor C in order to match the impedance of the antenna and the transmission circuit, the area of the ground electrode that forms the capacitor C is increased or the distance between the antenna electrode and the ground electrode that forms the capacitor C is increased. By contracting, impedance matching between the antenna and the transmission circuit can be achieved. Conversely, when it is necessary to reduce the capacitance of the capacitor C, the impedance of the antenna and the transmission circuit can be reduced by reducing the area of the ground electrode that forms the capacitor C or increasing the distance between the antenna electrode and the ground electrode that forms the capacitor C. Can be consistent.

The dielectric antenna of the present invention has the following effects.
(1) Since the matching circuit is integrated with the antenna, the antenna can be downsized.
(2) By adjusting the matching circuit, it is not necessary to increase the electrode length, and by changing the position of the ground electrode, the inductor L can be increased, and the antenna can be downsized.
(3) By adjusting the circuit, there is no need to increase the electrode length, and the inductor L can be increased by changing the position of the ground electrode, which can eliminate the cause of increased manufacturing costs.
(4) Since a high dielectric constant material is used for the antenna substrate, when forming the capacitor C of the matching circuit, the electrode area can be reduced and the antenna can be downsized.
(5) Since a high dielectric constant material is used for the antenna substrate, when the capacitor C of the matching circuit is formed, the electrode area can be reduced and the factor of increasing the manufacturing cost can be eliminated.

  FIG. 1A is a perspective view showing an example of a dielectric antenna of the present invention, and FIG. 1B is a diagram showing an equivalent circuit of the dielectric antenna of FIG.

The dielectric antenna 1 may be a known antenna as shown in Patent Document 1 or FIG. 7, for example, a plate-like plate having a high dielectric constant such as BaTiO ₃ , SrTiO ₃ , MgTiO ₃ , CaTiO ₃ , or rare earth oxide. A band-shaped antenna electrode 1b made of a conductor such as silver, gold, copper, nickel, or RuO ₂ is formed on the surface of the dielectric substrate 1a by printing.

  In the dielectric antenna 1 shown in FIG. 1A, the feeding electrode 2 is formed by printing on the back surface of the dielectric substrate 1a so as to face the start end 1d of the antenna electrode 1b. The capacitor C1 shown in FIG. 1B is formed by the antenna electrode 1b / dielectric substrate 1a / feeding electrode 2. The capacitance value of the capacitor C1 can be arbitrarily set by adjusting the area of the feeding electrode 2 or adjusting the distance between the antenna electrode 1b and the feeding electrode 1a. Further, the ground electrode 3 connected to the antenna electrode 1b is formed on the side surface of the dielectric substrate 1a by printing, and the inductor L1 shown in FIG. 1B is formed. By adjusting the position and width of the ground electrode 3, the value of the inductor L1 can be arbitrarily set. In this way, the capacitor C1 and the inductor L1 constituting the matching circuit are formed. As a result, the capacitor C1 and the inductor L1 of the equivalent circuit shown in FIG. 1B can be formed.

  FIG. 2A is a perspective view showing an example of the dielectric antenna of the present invention, and FIG. 2B is a diagram showing an equivalent circuit of the dielectric antenna of FIG.

  In the dielectric antenna 1 shown in FIG. 2A, a feeding electrode 1c connected to the starting end 1d of the antenna electrode 1b is formed. The ground electrode 3 connected to the antenna electrode 1b is formed on the side surface of the dielectric substrate 1a by printing, and the inductor L2 shown in FIG. 2B is formed. The value of the inductor L2 can be arbitrarily set by adjusting the position and width of the ground electrode. Further, the ground electrode 4 is formed by printing on the back surface facing the antenna electrode 1b, and the capacitor C2 shown in FIG. 2B is formed. The capacitance value of the capacitor C2 can be arbitrarily set by adjusting the area of the ground electrode 4 or adjusting the distance between the antenna electrode 1b and the ground electrode 4. In this way, the capacitor C2 and the inductor L2 constituting the matching circuit are formed. As a result, the capacitor C2 and the inductor L2 of the equivalent circuit shown in FIG. 2B can be formed.

  FIG. 3A is a perspective view showing an example of the dielectric antenna of the present invention, and FIG. 3B is a diagram showing an equivalent circuit of the dielectric antenna of FIG.

  In the dielectric antenna 1 shown in FIG. 3A, a feeding electrode 1c connected to the starting end of the antenna electrode 1b is formed. The ground electrode 4 to which the antenna electrode 1b is connected is formed on the side surface of the dielectric substrate 1a by printing, and the inductor L3 shown in FIG. 3B is formed. By adjusting the position and width of the ground electrode 4, the value of the inductor L3 can be arbitrarily set. In addition, the feeding electrode 5 is formed by printing on the side surface of the dielectric substrate 1a in parallel with the feeding electrode 1c, and the capacitor C3 shown in FIG. 3B is formed. The capacitance value of the capacitor C3 can be arbitrarily set by adjusting the area of the feeding electrode 5 or adjusting the distance between the antenna electrode 1b and the ground electrode 5. Further, the capacitor C3 and the inductor L3 that form the matching circuit are thus formed. As a result, the capacitor C3 and the inductor L3 of the equivalent circuit shown in FIG. 3B can be formed.

<Example 1>
The antenna electrode 1b is formed by printing silver spirally on the surface of a dielectric (barium titanate) base material 1a having a dielectric constant of 200 mm (length 10 mm × width 10 mm × thickness 2 mm) shown in FIG. The feeding electrode 2 was formed by printing on the back surface of the body substrate 1a so as to face the antenna electrode 1b, and the ground electrode 3 connected to the antenna electrode 1b was formed by printing on the side surface of the dielectric substrate 1a. This antenna was mounted on a printed board having a length of 20 mm × 20 mm × 0.8 mm by soldering and connected to the transmission circuit 6.

  The VSWR characteristics obtained by measuring this antenna with a high-frequency network analyzer are shown in FIG. 4A and the Smith chart in FIG. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 48Ω and a matching close to 50Ω of the transmission circuit from the Smith chart.

  As a result, even with the small antenna of the present invention, the impedance of the antenna approaches 50Ω, matching with the transmission circuit is achieved, and good characteristics can be secured.

<Example 2>
The antenna electrode 1b is formed by printing spirally with silver on the surface of a dielectric (barium titanate) substrate 1a having a dielectric constant of 200 mm in length 10 mm × width 10 mm × thickness 2 mm shown in FIG. Next, the feeding electrode 1c connected to the antenna electrode 1b is formed by printing on the side surface of the dielectric substrate 1a, and the ground electrode 3 connected to the antenna electrode 1b is formed by printing on the side surface of the dielectric substrate 1a. Further, the ground electrode 4 facing the antenna electrode 1b was formed on the back surface of the dielectric substrate 1a by printing. This antenna was mounted on a printed board having a length of 20 mm × 20 mm × 0.8 mm by soldering and connected to the transmission circuit 6.

  The VSWR characteristics obtained by measuring this antenna with a high frequency network analyzer are shown in FIGS. 5A and 5B and Smith charts. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 47Ω and a matching close to 50Ω of the transmission circuit from the Smith chart.

  As a result, even with the small antenna of the present invention, the impedance of the antenna approaches 50Ω, matching with the transmission circuit is achieved, and good characteristics can be secured.

<Example 3>
The antenna electrode 1b is formed by printing in a spiral shape with silver on the surface of a dielectric (barium titanate) substrate 1a having a dielectric constant of 200 mm in length 10 mm × width 10 mm × thickness 2 mm shown in FIG. Next, the feeding electrode 1c connected to the antenna electrode 1b is formed by printing on the side surface of the dielectric substrate 1a, and the ground electrode 3 connected to the antenna electrode 1b is formed by printing on the side surface of the dielectric substrate 1a. Further, the ground electrode 5 parallel to the power supply electrode 1c was formed on the side surface of the dielectric substrate 1a by printing. This antenna was mounted on a printed board having a length of 20 mm × 20 mm × 0.8 mm by soldering and connected to the transmission circuit 6.

  The VSWR characteristics obtained by measuring this antenna with a high frequency network analyzer are shown in FIGS. 6A and 6B and Smith charts. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 47Ω and a matching close to 50Ω of the transmission circuit from the Smith chart.

  As a result, even with the small antenna of the present invention, the impedance of the antenna approaches 50Ω, matching with the transmission circuit is achieved, and good characteristics can be secured.

  In the above embodiment, a rectangular spiral antenna electrode is shown, but the same result was obtained with various shapes of spiral antenna electrodes such as a circle, a triangle, and a polygon.

<Comparative Example 1>
The antenna electrode 1b is formed by printing silver in a spiral shape on the surface of a dielectric (barium titanate) base material 1a having a dielectric constant of 100 of 20 mm long × 20 mm wide × 2 mm shown in FIG. A feeding electrode 1c connected to the antenna electrode 1b is formed on the side surface of the material 1a by printing. This antenna was mounted on a printed board 100 having a length of 40 mm × 40 mm × 0.8 mm by solder connection, and connected to the transmission circuit 6. This antenna does not use a matching circuit.

  The VSWR characteristics of this antenna measured with a high frequency network analyzer are shown in FIGS. 8A and 8B and Smith charts. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 47Ω and a matching close to 50Ω of the transmission circuit from the Smith chart.

  As a result, the antenna of this comparative example has an antenna impedance close to 50Ω and can be matched with the transmission circuit to ensure good characteristics, but the antenna dimensions are as large as 20 mm long × 20 mm wide × 2 mm.

<Comparative example 2>
The antenna electrode 1b is formed by printing silver spirally on the surface of a dielectric (barium titanate) base material 1a having a dielectric constant of 200 mm × 10 mm × 2 mm shown in FIG. A feeding electrode 1c connected to the antenna electrode 1b is formed on the side surface of the material 1a by printing. This antenna was mounted on a printed board having a length of 20 mm × 20 mm × 0.8 mm by soldering and connected to the transmission circuit 6. This antenna does not use a matching circuit.

  The VSWR characteristics of this antenna measured with a high frequency network analyzer are shown in FIGS. 10A and 10B and Smith charts. From the result of this measurement, the antenna of the present embodiment has a resonance frequency of 316 MHz and a VSWR of 6 or more from the VSWR characteristics, and the impedance is 150Ω and mismatches with 50Ω of the transmission circuit from the Smith chart.

  As a result, the small antenna of this comparative example is inconsistent with the transmission circuit when the impedance of the antenna is 150Ω, and good characteristics cannot be secured.

<Comparative Example 3>
The antenna electrode 1b is formed by printing silver in a spiral shape on the surface of a dielectric (barium titanate) base material 1a having a dielectric constant of 200 mm × 10 mm × 2 mm shown in FIG. A feeding electrode 1c connected to the antenna electrode 1b is formed on the side surface of the material 1a by printing. Further, as a matching circuit with the transmission circuit, inductances or capacitors indicated by 27 to 29 in FIG. 14 are connected to the printed circuit board by soldering. This antenna was mounted on a printed board having a length of 40 mm × 20 mm × 0.8 mm by soldering and connected to the transmission circuit 6.

  The VSWR characteristics of this antenna measured with a high frequency network analyzer are shown in FIGS. 12A and 12B and Smith charts. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 38Ω from the Smith chart, and is close to 50Ω of the transmission circuit.

  As a result, even in the antenna of this comparative example, the impedance of the antenna is 38Ω and it is matched with the transmission circuit, and good characteristics are secured, but the mounting space of the antenna and the matching circuit is 40 mm long × 20 mm wide × 2 mm wide, The mounting area of the dielectric antenna according to the embodiment of the present invention is doubled and does not contribute to downsizing.

<Comparative example 4>
The antenna electrode 1b is formed by printing spirally with silver on the surface of a dielectric (barium titanate) base material 1a having a dielectric constant of 200 mm in length 10 mm × width 15 mm × thickness 2 mm shown in FIG. The feeding electrode 2 was formed by printing on the back surface of the body substrate 1a so as to face the antenna electrode 1b, and the ground electrode 3 connected to the antenna electrode 1b was formed by printing on the side surface of the dielectric substrate 1a. This antenna has a configuration in which an antenna electrode is not used as a ground electrode forming an inductor L for impedance matching. In order to increase the value of the inductor L of the matching circuit, the ground electrode 3 was extended. This antenna was mounted on a printed board having a length of 20 mm × 30 mm × 0.8 mm by soldering and connected to the transmission circuit 6.

  The VSWR characteristics of this antenna measured with a high frequency network analyzer are shown in FIGS. 14A and 14B and Smith charts. As a result of this measurement, the antenna of this example has a resonance frequency of 316 MHz and a VSWR of 2 or less from the VSWR characteristics, and has an impedance of 48Ω and a matching close to 50Ω of the transmission circuit from the Smith chart.

  Thereby, even in the small antenna of this comparative example, the impedance of the antenna approaches 50Ω, matching with the transmission circuit is achieved, and good characteristics can be secured. However, since the ground electrode 3 is extended in order to increase the value of the inductor L of the matching circuit, the antenna size is 10 mm long × 15 mm wide × 2 mm thick, and the size of the dielectric antenna of the embodiment of the present invention is 10 mm long × Compared with width 10mm x thickness 2mm, it is 1.5 times larger and does not contribute to downsizing. In addition, an increase in antenna size and an increase in electrode length cause a cost increase.

(A) The perspective view which shows an example of the dielectric antenna of this invention, (b) is a figure which shows the equivalent circuit of the dielectric antenna of (a). (A) The perspective view which shows an example of the dielectric antenna of this invention, (b) is a figure which shows the equivalent circuit of the dielectric antenna of (a). (A) The perspective view which shows an example of the dielectric antenna of this invention, (b) is a figure which shows the equivalent circuit of the dielectric antenna of (a). (A) is a graph which shows the VSWR characteristic of the dielectric antenna of Example 1, (b) is the Smith chart. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of Example 2, (b) is the Smith chart. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of Example 3, (b) is the Smith chart. 6 is a perspective view showing a dielectric antenna of Comparative Example 1. FIG. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of the comparative example 1, (b) is the Smith chart. 10 is a perspective view showing a dielectric antenna of Comparative Example 2. FIG. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of the comparative example 2, (b) is the Smith chart. It is a perspective view which shows the dielectric antenna of the comparative example 3. FIG. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of the comparative example 3, (b) is the Smith chart. It is a perspective view which shows the dielectric antenna of the comparative example 4. (A) is a graph which shows the VSWR characteristic of the dielectric antenna of the comparative example 4, (b) is the Smith chart.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dielectric antenna Base material 1a: Dielectric 1b: Antenna electrode 1c: Feed electrode 1d: Starting end of antenna electrode 2: Feed electrode 3: Ground electrode 4: Ground electrode 5: Feed electrode 6: Transmission circuit 27-29: Inductor or Capacitor

Claims (2)

  A matching circuit consisting of a capacitor electrode and an inductor electrode is formed on the surface of one plate-like dielectric substrate together with a spiral antenna electrode so as to form a part of the antenna electrode, a capacitor and an inductor. A dielectric antenna. An antenna electrode is formed on the surface of one plate-shaped dielectric substrate, a capacitor electrode is formed on the back surface of the dielectric substrate to be electromagnetically coupled opposite the antenna electrode, and the antenna is formed on the side surface of the dielectric substrate. 2. The dielectric antenna according to claim 1, wherein an inductor electrode conductively connected to the electrode is grounded to form a matching circuit including the capacitor and the inductor.

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