WO2009136876A1 - Arrangement of a transmitting antenna and a receiving antenna - Google Patents
Arrangement of a transmitting antenna and a receiving antenna Download PDFInfo
- Publication number
- WO2009136876A1 WO2009136876A1 PCT/SI2008/000028 SI2008000028W WO2009136876A1 WO 2009136876 A1 WO2009136876 A1 WO 2009136876A1 SI 2008000028 W SI2008000028 W SI 2008000028W WO 2009136876 A1 WO2009136876 A1 WO 2009136876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- planar
- coil
- antenna
- receiving
- transmitting
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving antennas
Definitions
- the invention relates to an arrangement of a transmitting antenna and a receiving antenna in a very space-savingly embodied portable radio communication device, which arrangement enables the magnetic field generated by the electric current in a planar transmitting coil to induce a low voltage in a planar receiving coil said voltage being lower than the supply voltage of a receiving circuit.
- An oscillating circuit is often used as an antenna provided for radio waves having a frequency ranging from several megahertz up to a hundred megahertz.
- the electric current in a transmitting coil Co TA of a transmitting antenna TA (Fig. Ia) is usually as high as possible to ensure the magnetic field in the transmitting coil Co TA to be as strong as possible. Therefore, the transmitting antenna TA is connected via its input i TA to an output amplifier of a transmitting circuit as a low- resistance load. Said matching is attained by having the capacitance of a capacitor Cal TA much higher than the capacitance of a capacitor Ca2 TA .
- the transmitting coil Co TA and the capacitors Cal TA and Ca2 TA all connected in parallel to each other, make an oscillating circuit of the transmitting antenna TA, which transmits at its resonance frequency.
- Said input i TA of the transmitting antenna TA is a common terminal of the capacitors Cal TA and Ca2 TA .
- the varying magnetic field in the area of a receiving coil Co 1 ⁇ of a receiving antenna RA induces the voltage at coil terminals tl 1 ⁇ and tl ⁇ (Fig. Ib).
- the receiving antenna RA must be connected to a receiving circuit as a high- resistance device, because it should provide a voltage high enough at its output o RA .
- the receiving coil Co 1 ⁇ and a capacitor Ca 1 ⁇ connected in parallel to each other make an oscillating circuit of the receiving antenna RA, whose resonance frequency lies at the frequency of radio waves to be received.
- the receiving antenna RA and the transmitting antenna TA thus require different configurations in order to send and receive radio waves in the most favourable manner.
- An external circuit functioning as a transmit-receive-switch in a time- division multiplexing of the transmission and reception actually enables the use of a single antenna as an interface between the antenna and the receiving circuit as well as transmitting circuit, yet such solution is rather expensive.
- the use of the transmitting antenna and the receiving antenna, which are situated nearby each other in a portable radio transmitting and receiving device such as a mobile telephone is disclosed in WO 90/13152.
- a low value of the voltage induced in the receiving antenna during transmission is achieved by tuning the transmitting antenna and the receiving antenna to two different frequencies.
- Weakening of the coupling between the two antennas in a mobile telephone is intended to be accomplished also by an asymmetrical connection of the transmitting antenna and a symmetrical connection of the receiving antenna, the two antennas being positioned orthogonally to each other, which represents a threedimensional construction (WO 02/05380).
- the antennas in both presented solutions are separated from each other, i.e. they do not overlap even partly, which would otherwise contribute to a further downsizing of the portable radio communication device.
- the technical problem to be solved by the present invention is to propose such mutual arrangement of a transmitting antenna and a receiving antenna being tuned to the same frequency and situated close to each other in a portable radio communication device that a value of the voltage induced in the receiving antenna during transmission will be reduced to the greatest extent possible.
- the arrangement of the invention of a transmitting antenna and a receiving antenna being tuned to the same frequency is accomplished by actual overlapping of their planar transmitting coil and planar receiving coil, respectively, and represents an efficient downsizing of the antenna system in a portable radio communication device.
- Fig. 2 magnetic field density by its magnitude and direction in dependence of the position with respect to a planar coil in which there is electric current
- Fig. 3 the arrangement of the invention of a planar transmitting coil and a planar receiving coil in a portable radio communication device.
- the magnetic field of a planar coil in which there is the electric current is inhomogeneous.
- the magnetic field density B by its magnitude and direction in dependence of the position with respect to the planar coil Co having terminals tl, t2, provided with two turns and in which there is the electric current I in the represented direction is shematically represented in Fig. 2.
- the inhomogeneity of the magnetic field of the planar coil in its closest area is exploited at an arrangement of the invention of a planar transmitting coil Co TA and a planar receiving coil Co 1 ⁇ with respect to each other in a portable radio communication device (Fig. 3).
- the planar receiving coil Co 1 ⁇ having terminals tl 1 ⁇ , t2 RA of a receiving antenna is produced in a plane of the planar transmitting coil Co TA having terminals tl TA , t2 TA of the transmitting antenna. Both coils are produced on the same printed circuit board.
- the planar receiving coil Co 1 ⁇ is designed and situated with respect to the planar transmitting coil Co TA in a way that the magnetic flux, generated by the electric current i T ⁇ in the planar transmitting coil Co TA , through the planar receiving coil Co 1 ⁇ equals zero.
- Each turn of the planar receiving coil Co 1 ⁇ is preferably designed with a narrow external loop which is produced outside the planar transmitting coil Co TA , so that the narrow external loop closely encloses the outer turn of the planar transmitting coil Co TA in the substantial part of its outer periphery (Fig. 3) and with an internal loop situated inside the planar transmitting coil Co TA so that the internal loop encloses the largest area possible.
- the magnetic flux generated by the electric current i TA in the planar transmitting coil Co TA through the planar receiving coil Co 1 ⁇ must equal zero the internal loop of the turn of the planar receiving coil Co 1 ⁇ should not enclose the area located directly at the inner turn of the planar transmitting coil Co ⁇ , at least not in a considerable part thereof.
- the internal loop of the planar receiving coil Co 1 ⁇ is connected to said narrow external loop of the same turn of the planar receiving coil Co 1 ⁇ , so that the electric current in both said loops flows in the same sense.
- a typical width of the external loop of the planar receiving coil Co 1 ⁇ equals the width of the trace of an individual turn of the planar transmitting coil Co TA , i.e. between 2 mm and 5 mm at the planar transmitting coil Co TA having one or several turns.
- Each turn of the planar receiving coil Co 1 ⁇ can also be designed in a second variant of the embodiment with a first narrow internal loop situated inside the planar
- T* A transmitting coil Co in a way that the first narrow internal loop is made close to the substantial part of the inner periphery of the inner turn of the planar transmitting coil Co TA and with a second internal loop produced inside the planar transmitting coil Co TA , so that the second internal loop encloses the largest area possible within the first narrow internal loop.
- the first narrow internal loop of the planar receiving coil Co 1 ⁇ is connected to the second narrow internal loop of the same turn in a way that the electric current in both internal loops flows in opposite senses.
- the areas of both said loops of the turn of the planar receiving coil Co 1 ⁇ in the preferred variant of the embodiment and in the second variant of the embodiment are determined in a way that the total flux of the magnetic field generated by the electric current i TA in the planar transmitting coil Co TA through the turn of the planar receiving coil Co 1 ⁇ 5 which is jointly made up by two loops mentioned in either variant equals zero or nearly equals zero.
- the voltage induced in the planar receiving coil Co 1 ⁇ of the receiving antenna under the influence of the activity of the transmitting antenna in the portable radio communication device equals zero or is near zero.
- the planar receiving coil Co 1 ⁇ of the invention differently detects the magnetic field generated by some distant transmitting antenna from the magnetic field generated by the planar transmitting coil Co TA .
- the magnetic field generated by some distant transmitting antenna in the area of the planar receiving coil Co 1 ⁇ is almost homogeneous.
- the voltage induced in the planar receiving coil Co 1 ⁇ in the preferred variant of the embodiment is hence determined by the variation of the magnetic flux through the total area of one or several turns of the planar receiving coil Co 1 ⁇ , each of said turns being made up of the narrow external loop and the internal loop.
- the voltage induced in the planar receiving coil Co 1 ⁇ in the second variant of the embodiment is determined by the variation of the magnetic flux through the effective area of one or several turns of the planar receiving coil Co 5 ⁇ in this variant of the embodiment.
- the effective area of the turn equals the difference between the second internal loop area and the first internal loop area.
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- Support Of Aerials (AREA)
- Near-Field Transmission Systems (AREA)
- Details Of Aerials (AREA)
Abstract
A planar receiving coil (CoRA) of a receiving antenna is produced in a plane of a planar transmitting coil (CoTA) of a transmitting antenna. The receiving coil (CoRA) is designed and situated with respect to the transmitting coil (CoTA) in a way that the magnetic flux, generated by the electric current in the planar transmitting coil (CoTA), through the planar receiving coil (CoRA) equals zero. Each turn of the planar receiving coil (CoRA) is designed with a narrow external loop which is produced outside the planar transmitting coil (CoTA) and an internal loop which is produced inside the planar transmitting coil (CoTA), the electric current in both said loops flowing in the same sense. Downsizing of the antenna system in a portable radio communication device is accomplished by the disclosed arrangement of the invention of the transmitting antenna and the receiving antenna tuned to the same frequency.
Description
Arrangement of a transmitting antenna and a receiving antenna in a portable radio communication device
The invention relates to an arrangement of a transmitting antenna and a receiving antenna in a very space-savingly embodied portable radio communication device, which arrangement enables the magnetic field generated by the electric current in a planar transmitting coil to induce a low voltage in a planar receiving coil said voltage being lower than the supply voltage of a receiving circuit.
An oscillating circuit is often used as an antenna provided for radio waves having a frequency ranging from several megahertz up to a hundred megahertz.
The electric current in a transmitting coil CoTA of a transmitting antenna TA (Fig. Ia) is usually as high as possible to ensure the magnetic field in the transmitting coil CoTA to be as strong as possible. Therefore, the transmitting antenna TA is connected via its input iTA to an output amplifier of a transmitting circuit as a low- resistance load. Said matching is attained by having the capacitance of a capacitor CalTA much higher than the capacitance of a capacitor Ca2TA. The transmitting coil CoTA and the capacitors CalTA and Ca2TA, all connected in parallel to each other, make an oscillating circuit of the transmitting antenna TA, which transmits at its
resonance frequency. Said input iTA of the transmitting antenna TA is a common terminal of the capacitors CalTA and Ca2TA.
On the other hand the varying magnetic field in the area of a receiving coil Co1^ of a receiving antenna RA induces the voltage at coil terminals tl1^ and tl^ (Fig. Ib). The receiving antenna RA must be connected to a receiving circuit as a high- resistance device, because it should provide a voltage high enough at its output oRA. The receiving coil Co1^ and a capacitor Ca1^ connected in parallel to each other make an oscillating circuit of the receiving antenna RA, whose resonance frequency lies at the frequency of radio waves to be received.
The receiving antenna RA and the transmitting antenna TA thus require different configurations in order to send and receive radio waves in the most favourable manner. An external circuit functioning as a transmit-receive-switch in a time- division multiplexing of the transmission and reception actually enables the use of a single antenna as an interface between the antenna and the receiving circuit as well as transmitting circuit, yet such solution is rather expensive.
The use of two separate antennas as the transmitting antenna and the receiving antenna represents a less complex solution. They only need to be put apart at such distance that the voltage induced in the receiving antenna during the transmission is lower than the supply voltage of the receiving circuit. However, the difficulties arise when the two antennas are to be used in a small-size device, like in a portable radio communication device that must be compact.
The use of the transmitting antenna and the receiving antenna, which are situated nearby each other in a portable radio transmitting and receiving device such as a mobile telephone is disclosed in WO 90/13152. A low value of the voltage induced
in the receiving antenna during transmission is achieved by tuning the transmitting antenna and the receiving antenna to two different frequencies. Weakening of the coupling between the two antennas in a mobile telephone is intended to be accomplished also by an asymmetrical connection of the transmitting antenna and a symmetrical connection of the receiving antenna, the two antennas being positioned orthogonally to each other, which represents a threedimensional construction (WO 02/05380). The antennas in both presented solutions are separated from each other, i.e. they do not overlap even partly, which would otherwise contribute to a further downsizing of the portable radio communication device.
Consequently, the technical problem to be solved by the present invention is to propose such mutual arrangement of a transmitting antenna and a receiving antenna being tuned to the same frequency and situated close to each other in a portable radio communication device that a value of the voltage induced in the receiving antenna during transmission will be reduced to the greatest extent possible.
Said technical problem is solved according to the invention by an arrangement of a transmitting antenna and a receiving antenna in a portable radio communication device being characterized by features cited in the first claim and the variants of the embodiment being characterized by features cited in dependent claims.
The arrangement of the invention of a transmitting antenna and a receiving antenna being tuned to the same frequency is accomplished by actual overlapping of their planar transmitting coil and planar receiving coil, respectively, and represents an
efficient downsizing of the antenna system in a portable radio communication device.
The solution of the invention will now be disclosed in detail by way of describing embodiments thereof and with reference to the accompanying drawings representing in:
Fig. 2 magnetic field density by its magnitude and direction in dependence of the position with respect to a planar coil in which there is electric current and Fig. 3 the arrangement of the invention of a planar transmitting coil and a planar receiving coil in a portable radio communication device.
The magnetic field of a planar coil in which there is the electric current is inhomogeneous. The magnetic field density B by its magnitude and direction in dependence of the position with respect to the planar coil Co having terminals tl, t2, provided with two turns and in which there is the electric current I in the represented direction is shematically represented in Fig. 2. The inhomogeneity of the magnetic field of the planar coil in its closest area is exploited at an arrangement of the invention of a planar transmitting coil CoTA and a planar receiving coil Co1^ with respect to each other in a portable radio communication device (Fig. 3).
According to the invention, the planar receiving coil Co1^ having terminals tl1^, t2RA of a receiving antenna is produced in a plane of the planar transmitting coil CoTA having terminals tlTA, t2TA of the transmitting antenna. Both coils are produced on the same printed circuit board. Moreover according to the invention, the planar receiving coil Co1^ is designed and situated with respect to the planar
transmitting coil CoTA in a way that the magnetic flux, generated by the electric current iTΛ in the planar transmitting coil CoTA, through the planar receiving coil Co1^ equals zero.
Each turn of the planar receiving coil Co1^ is preferably designed with a narrow external loop which is produced outside the planar transmitting coil CoTA, so that the narrow external loop closely encloses the outer turn of the planar transmitting coil CoTA in the substantial part of its outer periphery (Fig. 3) and with an internal loop situated inside the planar transmitting coil CoTA so that the internal loop encloses the largest area possible. Due to the basic requirement of the main claim 1 that the magnetic flux generated by the electric current iTA in the planar transmitting coil CoTA through the planar receiving coil Co1^ must equal zero the internal loop of the turn of the planar receiving coil Co1^ should not enclose the area located directly at the inner turn of the planar transmitting coil Coτ , at least not in a considerable part thereof. The internal loop of the planar receiving coil Co1^ is connected to said narrow external loop of the same turn of the planar receiving coil Co1^ , so that the electric current in both said loops flows in the same sense.
A typical width of the external loop of the planar receiving coil Co1^ equals the width of the trace of an individual turn of the planar transmitting coil CoTA, i.e. between 2 mm and 5 mm at the planar transmitting coil CoTA having one or several turns.
Each turn of the planar receiving coil Co1^ can also be designed in a second variant of the embodiment with a first narrow internal loop situated inside the planar
T* A transmitting coil Co in a way that the first narrow internal loop is made close to the substantial part of the inner periphery of the inner turn of the planar transmitting coil CoTA and with a second internal loop produced inside the planar transmitting
coil CoTA, so that the second internal loop encloses the largest area possible within the first narrow internal loop. The first narrow internal loop of the planar receiving coil Co1^ is connected to the second narrow internal loop of the same turn in a way that the electric current in both internal loops flows in opposite senses.
The areas of both said loops of the turn of the planar receiving coil Co1^ in the preferred variant of the embodiment and in the second variant of the embodiment are determined in a way that the total flux of the magnetic field generated by the electric current iTA in the planar transmitting coil CoTA through the turn of the planar receiving coil Co1^5 which is jointly made up by two loops mentioned in either variant equals zero or nearly equals zero.
Therefore, the voltage induced in the planar receiving coil Co1^ of the receiving antenna under the influence of the activity of the transmitting antenna in the portable radio communication device equals zero or is near zero.
The planar receiving coil Co1^ of the invention differently detects the magnetic field generated by some distant transmitting antenna from the magnetic field generated by the planar transmitting coil CoTA. The magnetic field generated by some distant transmitting antenna in the area of the planar receiving coil Co1^ is almost homogeneous.
The voltage induced in the planar receiving coil Co1^ in the preferred variant of the embodiment is hence determined by the variation of the magnetic flux through the total area of one or several turns of the planar receiving coil Co1^, each of said turns being made up of the narrow external loop and the internal loop.
The voltage induced in the planar receiving coil Co1^ in the second variant of the embodiment is determined by the variation of the magnetic flux through the effective area of one or several turns of the planar receiving coil Co5^ in this variant of the embodiment. The effective area of the turn equals the difference between the second internal loop area and the first internal loop area.
Claims
1. Arrangement of a transmitting antenna and a receiving antenna in a portable radio communication device, characterized in that a planar receiving coil (Co1^) of the receiving antenna is produced in a plane of a planar transmitting coil (CoTA) of the transmitting antenna and that the planar receiving coil (Co1^) is designed and situated with respect to the planar transmitting coil (CoTA) in a way that the magnetic flux, generated by the electric current in the planar transmitting coil (CoTΛ), through the planar receiving coil (Co1^) equals zero.
2. Arrangement of a transmitting antenna and a receiving antenna as recited in claim 1, characterized in that each turn of the planar receiving coil (Co1^) is designed with a narrow external loop which is produced outside the planar transmitting coil (CoTA) so that the narrow external loop is situated close to the substantial part of the outer periphery of the outer turn of the planar transmitting coil (CoTA) and with an internal loop which is produced inside the planar transmitting coil (CoTA) so that the internal loop encloses a large area and the internal loop is connected to the narrow external loop so that the electric current in both said loops flows in the same sense.
3. Arrangement of a transmitting antenna and a receiving antenna as recited in claim 1, characterized in that each turn of the planar receiving coil (Co1^) is designed with a first narrow internal loop which is produced inside the planar transmitting coil (CoTA) so that the first narrow internal loop is situated close to the substantial part of the inner periphery of the inner turn of the planar transmitting coil (CoTA) and with a second internal loop which is produced inside the first narrow internal loop so that the second internal loop encloses a large area and is connected to the first narrow internal loop so that the electric current in said internal loops flows in opposite senses.
4. Arrangement of a transmitting antenna and a receiving antenna as recited in claim 2 or 3, characterized in that the planar receiving coil (Co1^) and the planar transmitting coil (CoTA) are produced on the same printed circuit board.
5. Arrangement of a transmitting antenna and a receiving antenna as recited in claim 4, characterized in that the electric current in the planar transmitting coil (CoTA) induces the voltage in the planar receiving coil (Co1^), which is lower than the supply voltage of a receiving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SI2008/000028 WO2009136876A1 (en) | 2008-05-06 | 2008-05-06 | Arrangement of a transmitting antenna and a receiving antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SI2008/000028 WO2009136876A1 (en) | 2008-05-06 | 2008-05-06 | Arrangement of a transmitting antenna and a receiving antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009136876A1 true WO2009136876A1 (en) | 2009-11-12 |
Family
ID=39691040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SI2008/000028 WO2009136876A1 (en) | 2008-05-06 | 2008-05-06 | Arrangement of a transmitting antenna and a receiving antenna |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2009136876A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2328234A1 (en) * | 2009-11-19 | 2011-06-01 | Panasonic Corporation | Transmitting/receiving antenna and transmitter/receiver device using the same |
| US8508342B2 (en) | 2009-11-19 | 2013-08-13 | Panasonic Corporation | Transmitting / receiving antenna and transmitter / receiver device using the same |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091437A (en) * | 1964-07-29 | 1967-11-15 | Gen Electric | Improvements in selective antenna system |
| GB2133660A (en) * | 1982-11-09 | 1984-07-25 | Tag Radionics Ltd | Transponder detection systems |
| WO1990013152A1 (en) | 1989-04-18 | 1990-11-01 | Novatel Communications Ltd. | Duplexing antenna for portable radio transceiver |
| NL9300250A (en) * | 1993-02-09 | 1994-09-01 | Nedap Nv | Decoupled antenna coils |
| EP0650074A1 (en) * | 1993-10-22 | 1995-04-26 | Texas Instruments Holland B.V. | Highly accurate RF-ID positioning system |
| WO2002005380A1 (en) | 2000-07-10 | 2002-01-17 | Allgon Mobile Communications Ab | Antenna device |
| EP1829754A1 (en) * | 2006-03-01 | 2007-09-05 | IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. | Child seat presence and/or orientation detection system |
-
2008
- 2008-05-06 WO PCT/SI2008/000028 patent/WO2009136876A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091437A (en) * | 1964-07-29 | 1967-11-15 | Gen Electric | Improvements in selective antenna system |
| GB2133660A (en) * | 1982-11-09 | 1984-07-25 | Tag Radionics Ltd | Transponder detection systems |
| WO1990013152A1 (en) | 1989-04-18 | 1990-11-01 | Novatel Communications Ltd. | Duplexing antenna for portable radio transceiver |
| NL9300250A (en) * | 1993-02-09 | 1994-09-01 | Nedap Nv | Decoupled antenna coils |
| EP0650074A1 (en) * | 1993-10-22 | 1995-04-26 | Texas Instruments Holland B.V. | Highly accurate RF-ID positioning system |
| WO2002005380A1 (en) | 2000-07-10 | 2002-01-17 | Allgon Mobile Communications Ab | Antenna device |
| EP1829754A1 (en) * | 2006-03-01 | 2007-09-05 | IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. | Child seat presence and/or orientation detection system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2328234A1 (en) * | 2009-11-19 | 2011-06-01 | Panasonic Corporation | Transmitting/receiving antenna and transmitter/receiver device using the same |
| US8508342B2 (en) | 2009-11-19 | 2013-08-13 | Panasonic Corporation | Transmitting / receiving antenna and transmitter / receiver device using the same |
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