Source: http://www.google.com/patents/US20050099337?dq=6,418,462
Timestamp: 2014-10-24 23:14:13
Document Index: 317980260

Matched Legal Cases: ['art 129', 'art 129', 'art 129', 'art 129', 'art 129', 'art 129']

Patent US20050099337 - Antenna, method for manufacturing the antenna, and communication apparatus ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention provides a small multimode antenna capable of commonly using a single feeding point at a plurality of frequencies. The antenna includes a radiating conductor 1 disposed above a ground conductor 6 and distributed-constant circuits 2 and 3 coupled to the radiating conductor. Each of the distributed-constant...http://www.google.com/patents/US20050099337?utm_source=gb-gplus-sharePatent US20050099337 - Antenna, method for manufacturing the antenna, and communication apparatus including the antennaAdvanced Patent SearchPublication numberUS20050099337 A1Publication typeApplicationApplication numberUS 10/902,566Publication dateMay 12, 2005Filing dateJul 30, 2004Priority dateNov 12, 2003Also published asUS7015862Publication number10902566, 902566, US 2005/0099337 A1, US 2005/099337 A1, US 20050099337 A1, US 20050099337A1, US 2005099337 A1, US 2005099337A1, US-A1-20050099337, US-A1-2005099337, US2005/0099337A1, US2005/099337A1, US20050099337 A1, US20050099337A1, US2005099337 A1, US2005099337A1InventorsKen Takei, Hiroyuki AoyamaOriginal AssigneeHitachi, Ltd., Hitachi Metals, Ltd.Export CitationBiBTeX, EndNote, RefManReferenced by (85), Classifications (17), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetAntenna, method for manufacturing the antenna, and communication apparatus including the antennaUS 20050099337 A1Abstract The invention provides a small multimode antenna capable of commonly using a single feeding point at a plurality of frequencies. The antenna includes a radiating conductor 1 disposed above a ground conductor 6 and distributed-constant circuits 2 and 3 coupled to the radiating conductor. Each of the distributed-constant circuits is constructed by a transmission line and has a branch. One end of the radiating conductor and one end of the distributed-constant circuit 2 are connected to each other to be a connection point and, further, the other end of the radiating conductor and one end of the distributed-constant circuit 3 are connected to each other. The connection point is a single feeding point 9 using the ground conductor as an earth. The distributed-constant circuits 2 and 3 are designed as an equivalent circuit in which different stubs are connected in parallel with a transmission line, and impedance matching at a plurality of frequencies is realized at the feeding point. Images(12) Claims(10)
DESCRITPION OF PREFERRED EMBODIMENTS OF THE INVETNION An antenna according to the invention, a method of manufacturing the antenna, and a communication apparatus including the antenna will be described in more detail with reference to some embodiments shown in the drawings. The same reference numerals in FIGS. 1, 3, 4, 5(a) to 5(d), 6(a) to 6(e), 7(a) to 7(f), 8(a) to 8(f), 9(a) to 9(f), 10(a) to 10(h), 12 and 13 indicate the same or similar components. A first embodiment of the invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing components of an antenna of the invention and coupling relations of the components. FIG. 2 is a Smith chart illustrating the characteristics of the antenna of FIG. 1. The embodiment shown in FIG. 1 employs the structure such that one end of a radiating conductor 1 and one end of a first connecting conductor 4 are coupled to each other, a wire conductor 2 having a first branch is connected between the other end of the first connecting conductor 4 and a ground (ground conductor) 6, the other end of the radiating conductor 1 and one end of a second connecting conductor 5 are coupled to each other, a wire conductor 3 having a second branch is connected between the other end of the second connecting conductor 5 and the ground 6, and a coupling point between the first connecting conductor 4 and the wire conductor 2 having the first branch is used as a feeding point 9. An external RF circuit part expressed by a serial equivalent circuit of a characteristic impedance 7 and a source 8 is coupled to the feeding point 9 by using the ground 6 as an earth. Further, a wire conductor whose one end is connected to the ground 6 and a wire conductor whose one end is open are connected to the first branch of the wire conductor 2. A wire conductor whose one end is connected to the ground 6 and a wire conductor whose one end is open are connected to the second branch of the wire conductor 3. In such a structure, an RF power is supplied from the RF circuit part to the feeding point 9, and a receiving signal is supplied from the feeding point 9 to the RF circuit part. The first connecting conductor 4 and the second connecting conductor 5 are components for disposing the wire conductors 2 and 3 below the radiating conductor 1. The wiring conductors 2 and 3 form a distributed-constant circuit. As each of the wiring conductors 2 and 3, for example, a stripline or coaxial line is used. In the case of employing a stripline and placing importance on the gain of the antenna, the minimum line width of the radiating conductor 1 is set to be larger than the maximum line width of the stripline. In the case of employing a coaxial line, the electromagnetic field is confined inside an outer conductor, so that the length of the connecting conductors 4 and 5 can be shortened. Each of the wire conductor 2 having the first branch and the wire conductor 3 having the second branch is constructed by a transmission line, is a distributed-constant circuit having a branch, and can be expressed by an equivalent circuit in which an open stub and a short stub are joined in parallel with the transmission line. In the embodiment, by setting the length of the short stub to a � wavelength at a frequency to which the antenna is to have sensitivity, designing of the wire conductor 2 having the first branch and the wire conductor 3 having the second branch can be simplified. At different frequencies in the feeding point 9, the radiating conductor 1, first connecting conductor 4, second connecting conductor 5, and wire conductor 3 having the second branch are set so as to present an admittance having the value of a real part which is almost the same as the characteristic admittance equivalent to the characteristic impedance 7 of the RF circuit part and the value of a specific imaginary part. The wire conductor 2 having the first branch is set so as to have a susceptance value having an absolute value almost the same as the value of the specific imaginary part and which is a value of an opposite sign. Since the wire conductor 2 having the first branch is connected in parallel with the RF circuit part at the feeding point 9, the admittance having the susceptance value has to be close to the point A or B in FIG. 2. When the Smith chart is normalized by the characteristic impedance of the RF circuit part, the circle in the diagram in which the points A and B exist is the locus of the characteristic admittance expressed by pure resistance components equivalent to the characteristic impedance. Therefore, when the points A and B are on the locus of the characteristic admittance, perfect matching can be realized between the RF circuit part and the antenna of the embodiment. In other words, the antenna of the invention can have perfect matching with the RF circuit part when the admittance having the susceptance value exists near the locus of the characteristic admittance. To make the antenna of the embodiment operate as an antenna adapted to different carrier frequencies, the admittances at the carrier frequencies, which is seen toward the antenna side from the feeding point 9, have to exist near the point A or B in FIG. 4. There are options that admittances exist near the points A and A, B and B, A and B, or B and A in the frequency increasing direction in correspondence with the carrier frequencies. The optimum combination is selected by the ratio between the absolute value of the admittance at each of different carrier frequencies and the frequency, and a ratio of a matching band width at each carrier wave requested to the antenna. According to the embodiment, in the single feeding point 9, excellent impedance matching is realized between the RF circuit part and the free space at a plurality of different frequencies. Consequently, RF powers from the RF circuit part are led to the antenna and electric waves of a plurality of frequencies can be efficiently radiated from the antenna. In addition, energies of electric waves of a plurality of frequencies coming to the antenna can be efficiently transmitted to the RF circuit part. That is, according to the invention, a multimode antenna suitable for a multimedia wireless apparatus providing a plurality of information transmission services to the user by using carrier waves of different frequencies can be realized. A second embodiment of the invention will be described with reference to FIG. 3. FIG. 3 is a diagram showing components of an antenna according to the invention and the coupling relations of the components. The point different from the embodiment of FIG. 1 is that a wire conductor 12 having a first branch and a wire conductor 13 having a second branch are used in place of the wire conductor 2 having the first branch and the wire conductor 3 having the second branch. To the first branch of the wire conductor 12, a wire conductor whose one end is connected to the ground 6 and a wire conductor whose one end is similarly connected to the ground 6 are connected. To the second branch of the wire conductor 13, a wire conductor whose one end is connected to the ground 6 and a wire conductor whose one end is similarly connected to the ground 6 are connected. The wire conductor 12 having the first branch and the wire conductor 13 having the second branch can be expressed by an equivalent circuit in which two different short stubs are connected in parallel with the transmission line. Also in the second embodiment, by setting the length of the short stub to the � wavelength at a frequency to which the antenna is to have sensitivity, designing of the wire conductor 12 having the first branch and the wire conductor 13 having the second branch can be simplified. Effects of the embodiment are similar to those of the embodiment of FIG. 1. The second embodiment has effects that, when the ratio of the frequencies of different carrier waves to which the antenna has sensitivity is close to integer times, the wire conductor 12 having the first branch and the wire conductor 13 having the second branch can be realized in a small conductor area. A third embodiment of the invention will be described by using FIG. 4. FIG. 4 is a diagram showing components of an antenna according to the invention and the coupling relations of the components. The point different from the embodiment of FIG. 1 is that a wire conductor 22 having a first branch and a wire conductor 23 having a second branch are used in place of the wire conductor 2 having the first branch and the wire conductor 3 having the second branch. Two wire conductors each having one open end are connected to the first branch of the wire conductor 22, and two wire conductors each having one open end are connected to the second branch of the wire conductor 23. The wire conductor 22 having the first branch and the wire conductor 23 having the second branch can be expressed by an equivalent circuit in which two different open stubs are connected in parallel with the transmission line. Also in the embodiment, by setting the length of one open stub to the � wavelength at a frequency to which the antenna is to have sensitivity, designing of the wire conductor 22 having the first branch and the wire conductor 23 having the second branch can be simplified. Effects of the embodiment are similar to those of the embodiment of FIG. 1. In the third embodiment, when the frequencies of different carrier waves to which the antenna is to have sensitivity are as high as tens GHz or more, the wire conductor 22 having the first branch and the wire conductor 23 having the second branch can be realized by in proper dimensions without making the wire conductors 22 and 23 extremely short. Therefore, the embodiment has an effect that the influence on the antenna characteristics of a manufacture dimensional error of the wire conductors each having a branch can be reduced. A fourth embodiment of the invention will be described with reference to FIGS. 5(a) to 5(e). FIGS. 5(a) to 5(e) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, an uppermost layer 101, an intermediate layer 102, and a lowest layer 103. FIG. 5(a) is a cross section seen from a side face of the antenna, FIG. 5(b) shows a radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 5(c) shows a stripline pattern 42 having the first branch and a stripline pattern 43 having a second branch formed in the intermediate layer 102, FIG. 5(d) shows a ground conductor pattern 47 formed in the lowest layer 103, and FIG. 5(e) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. An end of the radiating conductor pattern 41 and the stripline pattern 42 having the first branch are electrically coupled to each other via a first side conductor pattern 52. The other end of the radiating conductor pattern 41 and the stripline pattern 43 having the second branch are electrically coupled to each other via a second side conductor pattern 51. Couplings of the uppermost layer 101 and intermediate layer 102, and the second connecting conductor and lowest layer 103 are made by an upper dielectric substrate 31 and a lower dielectric substrate 32 made of the same material in this order. Although the permittivity of the dielectric substrate 31 and that of the dielectric substrate 32 are the same since their materials are the same, it can be set so that the product of permittivity and permeability of each substrate does not increase in the direction from the ground conductor pattern 47 to the radiating conductor pattern 41. Other than the dielectric substrates, magnetic substrates can be used for coupling the layers. A first through hole land 63 is formed at one end of the stripline pattern 42 having the first branch. The first through hole land 63 is electrically coupled with a third through hole land 65 formed in the ground conductor pattern 47 via a first through hole 62 formed in the lower dielectric substrate 32. A second through hole land 64 is formed at one end of the stripline pattern 43 having the second branch. The second through hole land 64 is electrically coupled with a fourth through hole 66 formed in the ground conductor pattern 47 via a second through hole 61 formed in the lower dielectric substrate 32. According to the fourth embodiment, the ground conductor pattern 47 is coupled to the earth of the RF circuit part and the first side conductor pattern 52 is coupled to a signal line of the RF circuit part, thereby enabling the antenna of the embodiment of FIG. 1 to be embodied by a multilayer substrate process capable of performing mass production. Therefore, the embodiment has an effect such that the multimode antenna suitable to be applied to a multimode wireless apparatus can be manufactured at low cost by the mass production effect. A fifth embodiment of the invention will be described by using FIGS. 6(a) to 6(e). FIGS. 6(a) to 6(e) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, the uppermost layer 101, the intermediate layer 102, and the lowest layer 103. FIG. 6(a) is a cross section seen from a side face of the antenna, FIG. 6(b) shows the radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 6(c) shows the stripline pattern 42 having the first branch and the stripline pattern 43 having a second branch formed in the intermediate layer 102, FIG. 6(d) shows the ground conductor pattern 47 formed in the lowest layer 103, and FIG. 6(e) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. The point different from the fourth embodiment shown in FIGS. 5(a) to 5(e) is that the uppermost layer 101 and the intermediate layer 102 are coupled by an upper dielectric substrate 71 having permittivity lower than that of the lower dielectric substrate 32 for coupling the intermediate layer 102 and the lowest layer 103. In the embodiment, the strength of electromagnetic coupling between the radiating conductor pattern 41 and the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch can be reduced. Thus, designing of the stripline patterns 42 and 43 each having the branch can be facilitated as compared with that of the embodiment of FIGS. 5(a) to 5(e). A sixth embodiment of the invention will be described by using FIGS. 7(a) to 7(f). FIGS. 7(a) to 7(f) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, the uppermost layer 101, an intermediate insulating layer 104, the intermediate layer 102, and the lowest layer 103. FIG. 7(a) is a cross section seen from a side face of the antenna, FIG. 7(b) shows the radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 7(c) shows a conducting pattern 48 formed on the intermediate insulating layer 104, FIG. 7(d) shows the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch formed in the intermediate layer 102, FIG. 7(e) shows the ground conductor pattern 47 formed in the lowest layer 103, and FIG. 7(f) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. An end of the radiating conductor pattern 41 and the stripline pattern 42 having the first branch are electrically coupled to each other via the first side conductor pattern 52. The other end of the radiating conductor pattern 41 and the stripline pattern 43 having the second branch are electrically coupled to each other via the second side conductor pattern 51. The conducting pattern 48 is electrically coupled to the ground conductor pattern 47 via a third side conductor pattern 53 and a fourth side conductor pattern 54. Couplings of the uppermost layer 101 and intermediate insulating layer 104, the intermediate insulating layer 104 and intermediate layer 102, and the intermediate layer 102 and lowest layer 103 are made by the upper dielectric substrate 31, an intermediate dielectric substrate 33, and the lower dielectric substrate 32 made of the same material in this order. The first through hole land 63 is formed at one end of the stripline pattern 42 having the first branch. The first through hole land 63 is electrically coupled with the third through hole land 65 formed in the ground conductor pattern 47 via the first through hole 62 formed in the lower dielectric substrate 32. The second through hole land 64 is formed at one end of the stripline pattern 43 having the second branch. The second through hole land 64 is electrically coupled with a fourth through hole land 66 formed in the ground conductor pattern 47 via the second through hole 61 formed in the lower dielectric substrate 32. In the embodiment, the strength of electromagnetic coupling between the radiating conductor pattern 41 and the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch can be noticeably reduced. Thus, designing of the stripline patterns 42 and 43 each having the branch can be facilitated as compared with that of the embodiment of FIGS. 5(a) to 5(e) and the thickness of the upper dielectric substrate can be reduced, so that it is effective at decreasing the volume of the antenna. A seventh embodiment of the invention will be described by using FIGS. 8(a) to 8(f). FIGS. 8(a) to 8(f) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, the uppermost layer 101, the intermediate insulating layer 104, the intermediate layer 102, and the lowest layer 103. FIG. 8(a) is a cross section seen from a side face of the antenna, FIG. 8(b) shows the radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 8(c) shows the conducting pattern 48 formed on the intermediate insulating layer 104, FIG. 8(d) shows the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch formed in the intermediate layer 102, FIG. 8(e) shows the ground conductor pattern 47 formed in the lowest layer 103, and FIG. 8(f) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. The following two points are different from the sixth embodiment shown in FIGS. 7(a) to 7(f). The first point is that the first through hole land 63 formed at one end of the stripline pattern 42 having the first branch is electrically coupled with the third through hole land 65 formed in the ground conductor pattern 47 and a fifth through hole land 67 formed in the conducting pattern 48 via a third through hole 82 formed in the intermediate dielectric substrate 33 and the lower dielectric substrate 32. The second point is that the second through hole land 64 formed at one end of the stripline pattern 43 having the second branch is electrically coupled with the fourth through hole land 66 formed in the ground conductor pattern 47 and a sixth through hole land 68 formed in the conducting pattern 48 via a fourth through hole 81 formed so as to penetrate the intermediate dielectric substrate 33 and the lower dielectric substrate 32. In the embodiment, as compared with the sixth embodiment shown in FIGS. 7(a) to 7(f), the strength of electromagnetic coupling between the radiating conductor pattern 41 and the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch can be noticeably reduced. Thus, designing of the stripline patterns 42 and 43 each having the branch can be facilitated as compared with that of the embodiment of FIGS. 7(a) to 7(f). An eighth embodiment of the invention will be described by using FIGS. 9(a) to 9(f). FIGS. 9(a) to 9(f) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, the uppermost layer 101, the intermediate insulating layer 104, the intermediate layer 102, and the lowest layer 103. FIG. 9(a) is a cross section seen from a side face of the antenna, FIG. 9(b) shows the radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 9(c) shows the conducting pattern 48 formed on the intermediate insulating layer 104, FIG. 9(d) shows the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch formed in the intermediate layer 102, FIG. 9(e) shows the ground conductor pattern 47 formed in the lowest layer 103, and FIG. 9(f) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. The point different from the seventh embodiment shown in FIGS. 8(a) to 8(f) is that electrical coupling between the conducting pattern 48 and the ground conductor pattern 47 is enhanced by a fifth side conductor pattern 55, a sixth side conductor pattern 56, a seventh side conductor pattern 57, and an eighth side conductor pattern 58. According to the eighth embodiment, the strength of electromagnetic coupling between the radiating conductor pattern 41 and the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch can be noticeably reduced. Thus, designing of the stripline patterns 42 and 43 each having the branch can be facilitated as compared with that of the embodiment of FIGS. 8(a) to 8(f). A ninth embodiment of the invention will be described by using FIGS. 10(a) to 10(h). FIGS. 10(a) to 10(h) are diagrams showing the structure of an antenna constructed by using a multilayer substrate. The layers of the multilayer substrate are, in order from the top, the uppermost layer 101, a first intermediate insulating layer 104 a, a first intermediate layer 102 a, a second intermediate insulating layer 104 b, a second intermediate layer 102 b, and the lowest layer 103. FIG. 10(a) is a cross section seen from a side face of the antenna, FIG. 10(b) shows the radiating conductor pattern 41 formed in the uppermost layer 101, FIG. 10(c) shows a first conducting pattern 49 formed on the first intermediate insulating layer 104 a, FIG. 10(d) shows the stripline pattern 42 having the first branch formed in the first intermediate layer 102 a, FIG. 10(e) shows the second conducting pattern 48 formed on the second intermediate insulating layer 104 b, FIG. 10(f) shows the stripline pattern 43 having the second branch formed in the second intermediate layer 102 b, FIG. 10(g) shows the ground conductor pattern 47 formed in the lowest layer 103, and FIG. 10(h) is a surface expansion plan excluding the lowest layer 103 as an earth layer of the antenna. An end of the radiating conductor pattern 41 and the stripline pattern 42 having the first branch are electrically coupled to each other via the first side conductor pattern 52. The other end of the radiating conductor pattern 41 and the stripline pattern 43 having the second branch are electrically coupled to each other via the second side conductor pattern 51. The first conducting patterns 49 and the second conducting pattern 48 are electrically coupled to the ground conductor pattern 47 via the third side conductor patterns 53 and the fourth side conductor pattern 54. Couplings of the uppermost layer 101 and first intermediate insulating layer 104 a, the first intermediate insulating layer 104 a and first intermediate layer 102 a, the first intermediate layer 102 a and second intermediate insulating layer 104 b, the second intermediate insulating layer 104 b and second intermediate layer 102 b, and the second intermediate layer 102 b and lowest layer 103 are coupled to each other by the upper dielectric substrate 31, a first intermediate dielectric substrate 34, a second intermediate dielectric substrate 35, a third intermediate dielectric substrate 36, and the lower dielectric substrate 32 made of the same material in this order. The first through hole land 63 is formed at one end of the stripline pattern 42 having the first branch. The first through hole land 63 is electrically coupled with a seventh through hole land 69 formed in the intermediate conducting pattern 49 and the fifth through hole land 67 formed in the ground conductor pattern 48 via a third through hole 83 formed so as to penetrate the first and second intermediate dielectric substrates 34 and 35. The second through hole land 64 is formed at one end of the stripline pattern 43 having the second branch. The second through hole land 64 is electrically coupled with the sixth through hole land 68 formed in the intermediate conducting pattern 48 and the fourth through hole land 66 formed in the intermediate conducting pattern 47 via a fourth through hole 84 formed so as to penetrate the second intermediate dielectric substrate 36 and the lower dielectric substrate 32. In the embodiment, the area for forming the stripline pattern 42 having the first branch and the stripline pattern 43 having the second branch can be increased, so that the flexibility of designing of the stripline patterns 42 and 43 each having the branch can be increased as compared with the embodiments of FIGS. 5(a) to 9(f). Therefore, the applicable frequency range of the antenna of the invention can be widened. It produces an effect such that the variety of wireless systems to which the antenna of the invention can be applied can be increased. A tenth embodiment of the invention will be described with reference to FIG. 11. A method for manufacturing an antenna of the invention as a tenth embodiment will be described. FIG. 11 is a flowchart showing process for manufacturing a number of antennas in a lump. First, on the basis of ceramic multilayer substrate process, the conductor patterns of the layers of the antenna are formed by a conductor printing process (step S1). Next, a via forming process (step S2) and a via filling process (step S3) are performed for forming through holes of the antenna. Subsequently, a lamination process is performed for joining the layers together (step S4) and antennas formed in a lump in a sheet are cut into an antenna respectively (step S5). After that, a sintering process is performed (step S6), the side conductor structure of the antenna is formed by a side conductor printing process (step S7) and, finally, a baking process (step S8) is performed, thereby obtaining products. Since a number of antennas applied to multimedia wireless apparatuses can be manufactured in a lump by the normal ceramic multilayer substrate process effective to mass production, the embodiment is effective at reducing the cost of the antenna. An eleventh embodiment of the invention will be described with reference to FIG. 12. FIG. 12 shows a communication apparatus on which the antenna according to the invention is mounted. As shown in FIG. 12, on a folding-type surface body 121, a speaker 122, a display 123, a keypad 124, and a microphone 125 are mounted. On the inside of the surface body 121 covered with a first rear body 133 and a second rear body 134, a first circuit board 126 and a second circuit board 127 connected via a flexible cable 128, an antenna 135 of the invention, and a battery 132 are housed. On the top face (on the rear body 134 side) 136 of the circuit board 127, the antenna 135 and an RF circuit part 129 are mounted, and a ground conductor pattern 130 coupled to the earth of the RF circuit part 129 and a signal conductor pattern 131 connected to a signal input-output point of the RF circuit part 129 are formed. The ground conductor pattern of the antenna 135 is in contact with the top face 136 of the board 127, the ground conductor pattern 130 and the earth side of the feeding point of the antenna 135 are coupled to each other, and the signal conductor pattern 131 and the driving side of the feeding point of the antenna 135 are coupled to each other. The structure shown in FIG. 12 is characterized in that the antenna 135 of the invention is positioned on the side opposite to the display 123 and the speaker 122 over the circuit board 127. According to the embodiment, a wireless apparatus enjoying services of a plurality of wireless systems can be realized by the form including the antenna. Thus, the embodiment is effective at reducing the size of the wireless apparatus and improving the stored ability and the portability for the user. A twelfth embodiment of the invention will be described with reference to FIG. 13. FIG. 13 shows another communication apparatus on which the antenna of the invention is mounted. As shown in FIG. 13, the speaker 122, display 123, keypad 124, and microphone 125 are mounted on a surface body 141. On the inside of the surface body 141 covered with the rear body 134, a circuit board 142, the antenna 135 of the invention, and the battery 132 are housed. On the top face (on the rear body 134 side) 136 of the circuit board 142, the antenna 135 and the RF circuit part 129 are mounted, and the ground conductor pattern 130 coupled to the earth of the RF circuit part 129 and the signal conductor pattern 131 connected to the signal input-output point of the RF circuit part 129 are formed. The ground conductor pattern of the antenna 135 is in contact with the top face 136 of the board 142, the ground conductor pattern 130 and the earth side of the feeding point of the antenna 135 are coupled to each other, and the signal conductor pattern 131 and the driving side of the feeding point of the antenna 135 are coupled to each other. The structure is characterized in that the antenna 135 of the invention is positioned on the side opposite to any of the display 123, microphone 125, speaker 122 and keypad 124 over the circuit board 142. According to the embodiment, a wireless apparatus enjoying services of a plurality of wireless systems can be realized by the form including the antenna. Thus, the embodiment is effective at reducing the size of the wireless apparatus and improving the stored ability and the portability for the user. Different from the embodiment of FIG. 12, the circuit board and the bodies can be integrally manufactured, so that the twelfth embodiment is effective at reducing the manufacturing cost due to reduction in the volume of the apparatus and the number of assembling processes. According to the invention, excellent impedance matching between the RF circuit part and the free space can be realized by a single feeding point at a plurality of frequencies. Thus, the multimode antenna suitable for a multimedia wireless apparatus for providing plural information transmission services to the user by using carrier waves of different frequencies can be realized. Since a single feeding point is used, the RF circuit handling a plurality of carrier waves can be integrated. Therefore, the RF circuit handling the plurality of carrier waves and the antenna can be mounted on a single RF module, and effects of reduction in the size of the multimedia wireless apparatus and the manufacturing cost and improvement in sensitivity of the apparatus can be obtained. It is further understood by those skilled in the art that the foregoing description is a preferred embodiment of the disclosed device and that various changes and modifications may be made in the invention without departing from the spirit and scope thereof. 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Manufacturing Co., Ltd.Antenna device, RFID tag, and communication terminal apparatusUS20090065594 *Nov 24, 2008Mar 12, 2009Murata Manufacturing Co., Ltd.Wireless ic device and wireless ic device composite component* Cited by examinerClassifications U.S. Classification343/700.0MS, 343/846International ClassificationH01Q1/24, H01Q13/08, H01Q1/38, H01Q5/01, H01Q9/30, H01Q1/52, H01Q9/42, H01Q1/22, H01Q1/40Cooperative ClassificationH01Q9/30, H01Q1/243, H01Q1/38European ClassificationH01Q1/38, H01Q1/24A1A, H01Q9/30Legal EventsDateCodeEventDescriptionMay 11, 2010FPExpired due to failure to pay maintenance feeEffective date: 20100321Mar 21, 2010LAPSLapse for failure to pay maintenance feesOct 26, 2009REMIMaintenance fee reminder mailedOct 18, 2004ASAssignmentOwner name: HITACHI METALS, LTD., JAPANOwner name: HITACHI, LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TAKEI, KEN;AOYAMA, HIROYUKI;REEL/FRAME:015898/0483;SIGNING DATES FROM 20040725 TO 20040802RotateOriginal 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