Antenna with transmission line and method for manufacturing antenna with transmission line

Abstract

Provided is an antenna with a transmission line, which has a thin structure corresponding to the space saving required when incorporated in an electronic device having a communication function, and which has a structure that greatly improves signal reflection and transmission loss in a high-frequency band. An antenna (1) with a transmission line is provided with: a first substrate (11) on which a first conductor (21) is formed; a covering layer (14) that covers the first conductor (21); a second substrate (12) on which a second conductor (22) is formed; and a third base material (13) on which a third conductor (23) is formed, the second base material (12), and the cover layer (14) are formed, the first base material (11) and the third conductor (23) are thermocompression bonded, the first conductor (21) has an antenna conductor (31), a transmission line conductor (32), and a first ground conductor (41), the second conductor (22) is ultrasonically bonded to a ground portion of the antenna conductor (31), and the second conductor (22) and the third conductor (23) are ultrasonically bonded to each other in a state of surrounding the transmission line conductor (32).

Description

Technical Field

[0001] The present invention relates to an antenna with a transmission line for electronic equipment. Background Art

[0002] Conventionally, a wireless card module having an antenna substrate is known (Patent Document 1: Japanese Patent Application Publication No. 2002-092576). In addition, a transmission line in which a second conductor and a third conductor are disposed so as to surround a transmission line conductor and ultrasonically bonded is proposed (Patent Document 2: Japanese Patent Application Publication No. 2021-083040).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-092576

[0006] Patent Document 2: Japanese Patent Application Publication No. 2021-083040 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Electronic devices with communication functions, such as laptop computers and smart phones, are becoming increasingly smaller and lighter. However, the wireless card module described in Patent Document 1 is difficult to further miniaturize. Therefore, a coaxial cable integrated module in which a coaxial cable is welded on an antenna substrate is proposed and sold on the market. The outer diameter of the coaxial cable of the coaxial cable integrated module becomes a bottleneck. When it is built into an electronic device, it is necessary to ensure space for routing the coaxial cable. In addition, since the coaxial cable is welded to the antenna, there are problems of signal reflection and large transmission loss.

[0009] Means for solving problems

[0010] The present invention is completed in view of the above situation, and its purpose is to provide an antenna with a transmission line, which has a thin structure corresponding to the space saving required when built into an electronic device with communication function, and has a structure that greatly improves signal reflection and transmission loss in the high frequency band.

[0011] The above-mentioned problems are solved by the solution means disclosed below as one embodiment.

[0012] The antenna with a transmission line of the present invention is characterized in that it comprises: a first substrate on which a first conductor is formed; a covering layer covering the first conductor; a second substrate on which a second conductor is formed; and a third substrate on which a third conductor is formed, the covering layer being thermally pressed to the first substrate, the second substrate being thermally pressed to the covering layer, and the third substrate being thermally pressed to the first substrate, the first conductor comprising: an antenna conductor; a transmission line conductor connected to a power supply portion of the antenna conductor; and a first grounding conductor close to an end portion of the transmission line conductor, the second conductor being ultrasonically bonded to a grounding portion of the antenna conductor, and the second conductor and the third conductor being ultrasonically bonded to each other in a state of surrounding the transmission line conductor.

[0013] According to this structure, the antenna conductor and the transmission line conductor are integrally formed of the same material, so that the signal reflection and transmission loss in the antenna connection part can be greatly improved. In addition, since the first base material, the cover layer, the second base material and the third base material are stacked and the integral structure is combined with the thermal compression bonding and the ultrasonic bonding, it can be a thin structure corresponding to space saving.

[0014] The manufacturing method of an antenna with a transmission line of the present invention manufactures an antenna with a transmission line, and the antenna with a transmission line is configured to include: a first substrate, which is formed with a first conductor; a covering layer, which covers the first conductor; a second substrate, which is formed with a second conductor; and a third substrate, which is formed with a third conductor, the covering layer is thermally pressed to the first substrate, the second substrate is thermally pressed to the covering layer, and the third substrate is thermally pressed to the first substrate, the first conductor includes: an antenna conductor; a transmission line conductor, which is connected to a power supply portion of the antenna conductor; and a first grounding conductor, which is close to an end portion of the transmission line conductor, characterized in that the second conductor is ultrasonically bonded to the grounding portion of the antenna conductor, and the second conductor and the third conductor are ultrasonically bonded to each other in a state of surrounding the transmission line conductor.

[0015] According to this structure, the antenna conductor and the transmission line conductor are integrally formed of the same material, so that the signal reflection and transmission loss in the antenna connection portion can be greatly improved. In addition, since the first substrate, the cover layer, the second substrate, and the third substrate are stacked and the thermocompression bonding and the ultrasonic bonding are combined to form an integrated structure, the antenna and the transmission line with a thin structure corresponding to space saving can be manufactured simultaneously. Therefore, the manufacturing man-hours can be greatly reduced.

[0016] As an example, the first substrate and the cover layer are made of fluororesin. Thus, high-speed transmission can be handled. As an example, the antenna conductor has an inverted F-shaped antenna portion. Thus, an antenna portion corresponding to a high-frequency multi-band can be formed. As an example, an antenna portion corresponding to two frequencies of a 2.45 GHz band and a 5.2 GHz band can be easily formed.

[0017] As an example, the transmission line conductor is configured to have a straight portion extending straightly from the end portion and a bent portion bent from the straight portion, and the bent portion is connected to the power supply portion. Thus, since the antenna portion and the transmission line can be arranged crosswise, the wiring routing length can be easily shortened. As an example, the second conductor and the third conductor are both L-shaped structures when viewed from above. Thus, the antenna portion and the transmission line can be arranged orthogonally, so the wiring routing length can be minimized.

[0018] As an example, the second conductor and the third conductor are set to have the same outer size. The second conductor and the third conductor having the same outer size are provided at the same position on the front and back sides, thereby preventing the base from warping.

[0019] As an example, the first conductor is configured to have a second grounding conductor close to the transmission line conductor, the second grounding conductor is arranged opposite to the grounding portion via the transmission line conductor, and the third conductor is formed with a plurality of through holes at a position where it overlaps with the grounding portion when viewed from above. That is, since the transmission line conductor at a portion connected to the power supply portion is ultrasonically bonded to each other in a state surrounded by the second conductor, the second grounding conductor, the grounding portion, and the third conductor, the shielding effect can be further improved. Furthermore, since the second conductor and the third conductor are arranged opposite to each other, stress during processing is offset, and warping of the substrate can be prevented.

[0020] As an example, the first conductor has a second grounding conductor close to the transmission line conductor, the second grounding conductor is arranged opposite to the grounding portion across the transmission line conductor, the second conductor and the third conductor are overlapped across the grounding portion, the anvil is abutted against the second conductor, a welding head with a cone arranged at a predetermined interval is inserted from a direction opposite to the anvil and abutted against the grounding portion, and the third conductor and the grounding portion are ultrasonically bonded by the anvil and the welding head. As a result, the overlapping portion of the second conductor, the grounding portion, and the third conductor is suppressed by the anvil, thereby preventing the conductor from being stretched during ultrasonic bonding. In addition, it is possible to prevent the thermoplastic resin from being extruded more than necessary during ultrasonic bonding, and when the thermoplastic resin is thermally contracted after ultrasonic bonding, the thermal strain can be alleviated. Therefore, it is possible to manufacture an antenna with a transmission line having a thin structure corresponding to space saving and a structure that greatly improves signal reflection and transmission loss in a high-frequency band.

[0021] Effects of the Invention

[0022] The antenna with a transmission line of the present invention can realize a thin structure corresponding to the space saving required when built into an electronic device with a communication function and a structure in which signal reflection and transmission loss in a high frequency band are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic plan view showing an example of the antenna with a transmission line according to the present embodiment.

[0024] Figure 2A yes Figure 1 A side view of the antenna with transmission line is shown. Figure 2B yes Figure 1 Bottom view of the antenna with transmission line shown.

[0025] Figure 3 yes Figure 1 A cross-sectional view taken along line III-III of the antenna with a transmission line is shown.

[0026] Figure 4 yes Figure 1 A cross-sectional view taken along line IV-IV of the antenna with a transmission line is shown.

[0027] Figure 5A It is shown Figure 1 A schematic plan view of an example of a first shield member in an antenna with a transmission line shown in FIG. Figure 5B It is shown Figure 1 A schematic top view of an example of a covering layer in an antenna with a transmission line is shown. Figure 5C It is shown Figure 1 A schematic top view of an example of a base in an antenna with a transmission line is shown, Figure 5D It is shown Figure 1 FIG. 2 is a schematic plan view of an example of a second shield in the antenna with a transmission line shown in FIG.

[0028] Fig. 6A It is shown Figure 1 A schematic cross-sectional view of an ultrasonic bonding structure in an antenna with a transmission line shown in FIG. Figure 6B is a schematic perspective view showing an example of an anvil, Figure 6C It is a schematic perspective view showing an example of a welding head.

[0029] Figure 7 It shows that Figure 1 The illustrated schematic plan view is an example of a case where antennas with transmission lines are manufactured collectively at the same time in the form of sheet-shaped workpieces.

[0030] Figure 8 It shows that Figure 1 The antenna with a transmission line shown is a schematic rear view of an example in which the antenna with a transmission line is attached to the rear side of a monitor.

[0031] Fig. 9 1 is a frequency characteristic graph showing the result of simulating S parameters in the antenna with a transmission line according to the present embodiment.

[0032] Fig.10 1 is a flowchart showing a manufacturing procedure of the antenna with a transmission line according to the present embodiment. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The antenna with transmission line 1 of this embodiment is formed of a flexible multilayer wiring substrate, and has a structure in which an antenna conductor 31 and a transmission line conductor 32 are integrally formed of the same material. Figure 1 1 is a schematic plan view showing an example of the antenna with a transmission line 1 , and a region P4 surrounded by a dotted line is an enlarged view of the antenna conductor 31 in a plan view. Figure 2A It is a side view of the antenna 1 with a transmission line. Figure 2B 1 is a bottom view of the antenna with a transmission line 1 , and a region P5 surrounded by a dotted line is an enlarged view of the antenna conductor 31 when viewed from below. Figure 3 yes Figure 1 Cross-sectional view along line III-III. Figure 4 yes Figure 1 In all the drawings for explaining the embodiments, the same reference numerals are given to components having the same functions, and their repeated descriptions are sometimes omitted.

[0034] like Figure 1 to Figure 4 As shown, the antenna 1 with a transmission line includes a first substrate 11 on which a first conductor 21 is formed, a cover layer 14 covering the first conductor 21, a second substrate 12 on which a second conductor 22 is formed, and a third substrate 13 on which a third conductor 23 is formed. The cover layer 14 is thermally pressed to the first substrate 11, the second substrate 12 is thermally pressed to the cover layer 14, and the third substrate 13 is thermally pressed to the first substrate 11, so as to form an integral structure. In addition, the second conductor 22 is ultrasonically bonded to the ground portion 31c of the antenna conductor 31, and the second conductor 22 and the third conductor 23 are ultrasonically bonded to each other in a state of surrounding the transmission line conductor 32, and the ground portion 31c and the transmission line conductor 32 are shielded by the second conductor 22 and the third conductor 23. As an example, a connector 43 is installed at the input end of the transmission line conductor 32 to connect to a control circuit, and the control circuit is signal-connected to the antenna conductor 31.

[0035] Figure 5A 1 is a schematic plan view showing an example of the first shielding member 35. Figure 5Bis a schematic top view showing an example of the cover layer 14, Figure 5C is a schematic top view showing an example of the base 30, Figure 5D 2 is a schematic top view showing an example of the second shielding member 36. Figure 5C As shown, the first conductor 21 includes an antenna conductor 31, a transmission line conductor 32 connected to a feeding portion 31a of the antenna conductor 31, and a first ground conductor 41 close to an end portion 32a of the transmission line conductor 32. The first conductor 21 includes a second ground conductor 42 close to the transmission line conductor 32, and the second ground conductor 42 is arranged opposite to the ground portion 31c via the transmission line conductor 32.

[0036] As an example, the transmission line conductor 32 has a straight portion 32b extending straight from the end 32a and a bent portion 32c bent from the straight portion 32b, and the bent portion 32c is connected to the feeding portion 31a. As an example, the antenna portion 31b of the antenna conductor 31 and the straight portion 32b of the transmission line conductor 32 are arranged orthogonally.

[0037] As an example, the first substrate 11 and the cover layer 14 are made of thermoplastic fluororesin. As an example, the second substrate 12 and the third substrate 13 are made of thermoplastic polyimide resin. As an example, the antenna conductor 31 has an inverted F-shaped antenna portion 31b.

[0038] like Figure 5A and Figure 5D As shown in FIG. 1 , the first shield 35 formed with the second conductor 22 and the second shield 36 formed with the third conductor 23 are both L-shaped in a plan view, and their outer shapes are set to be the same size. Figure 5A As shown, the first shield 35 is formed with a fifth window portion 35 a penetrating therethrough in order to expose the end portion 32 a of the transmission line conductor 32 .

[0039] like Figure 3 , Figure 5B as well as Figure 5C As shown, the base 30 is formed with a plurality of first windows 11a through which the second conductor 22 and the third conductor 23 are ultrasonically bonded, and the cover layer 14 is formed with a plurality of second windows 14a through which the second conductor 22 and the third conductor 23 are ultrasonically bonded. Figure 5B As shown, the cover layer 14 is formed with a plurality of third windows 14 b penetrating therethrough for ultrasonically bonding the second conductor 22 to the ground portion 31 c , and the cover layer 14 is formed with a fourth window 14 c penetrating therethrough for ultrasonically bonding the second conductor 22 to the second ground conductor 42 .

[0040] like Figure 1 As shown, the second conductor 22 has a plurality of recesses 22 a formed at positions overlapping the ground portion 31 c in a plan view.

[0041] like Figure 7 As shown, as an example, the antennas with transmission lines 1 are manufactured in a sheet-like workpiece state at the same time. The antennas with transmission lines 1 are formed at a first interval P1 and are divided into individual antennas with transmission lines 1 by a dividing step described later.

[0042] Figure 8 This is a schematic rear view showing an example of a case where an antenna 1 with a transmission line is installed on the back side of a monitor 71 in an electronic device with a communication function such as a laptop computer or a smart phone. As an example, the electronic device with a communication function is provided with a flat monitor 71 composed of a liquid crystal display or an organic EL display on the back side of a frame 70. The antenna 1 with a transmission line has an inverted F-shaped antenna portion, which corresponds to a high frequency multi-band. As an example, the antenna 1 with a transmission line is L-shaped when viewed from above, and the thickness is set to be less than 0.5 mm.

[0043] According to the antenna 1 with a transmission line of this embodiment, a pair can be installed on the back side of the monitor 71, so it can correspond to the space saving required when it is built into an electronic device. In addition, the outermost layer of the antenna 1 with a transmission line is covered with an insulating resin material, so it is possible to prevent oxidation of the internal conductor and can be easily installed inside the electronic device. In addition, the above structure is an example, and the antenna 1 with a transmission line can be set to any shape according to the monitor shape, monitor size or monitor configuration. As an example, the antenna 1 with a transmission line can be formed into an I shape when viewed from above.

[0044] Fig. 9 1 is a frequency characteristic curve diagram showing the result of simulating S parameters in the antenna 1 with a transmission line of the present embodiment. The vertical axis is the reflected signal level, and the horizontal axis is the scanning frequency. According to the simulation results, it can be confirmed that the antenna 1 with a transmission line is an antenna portion corresponding to two frequencies, the frequency band of 2.45 GHz and the frequency band of 5.2 GHz.

[0045] As an example, a manufacturing device for an antenna 1 with a transmission line is provided with a first conductor forming machine, an unnecessary area removing machine, a first bonding machine, a thermal compression bonding machine, a second bonding machine, an inspection machine, and a separating and removing machine in order from the upstream side, and has a controller for controlling them.

[0046] Next, a method for manufacturing the antenna with a transmission line 1 according to the present invention will be described below.

[0047] Fig.10The flowchart shows the manufacturing process of the antenna with transmission line 1 of the present embodiment. As an example, the antenna with transmission line 1 is manufactured in the order of the first conductor forming step S1, the unnecessary area removing step S2, the first joining step S3, the second joining step S4, the thermal compression step S5, the inspection step S6, and the segmentation step S7.

[0048] As an example, the first conductor 21, the second conductor 22, and the third conductor 23 are made of copper or a copper alloy. In the first conductor forming step S1, the double-sided copper-clad substrate is subjected to etching by a subtractive method, and the antenna conductor 31, the transmission line conductor 32, the first ground conductor 41, and the second ground conductor 42 are formed on the first main surface of the first substrate 11, and the conductors are removed from the second main surface of the first substrate 11 to form the base 30. In this way, it is possible to prevent warping and form a flat base 30. As a method other than the above, the first main surface of the first substrate 11 can be subjected to pattern plating by an additive method to form the antenna conductor 31, the transmission line conductor 32, the first ground conductor 41, and the second ground conductor 42, thereby forming the base 30.

[0049] As an example, the first substrate 11 and the cover layer 14 are selected from tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene (FEP), polytrifluorochloroethylene (PCTFE), tetrafluoroethylene-ethylene copolymer (ETFE), trifluorochloroethylene-ethylene copolymer (ECTFE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and other known thermoplastic fluororesins. As an example, the second substrate 12 and the third substrate 13 are composed of thermoplastic polyimide resin (PE).

[0050] In the unnecessary region removing step S2, the unnecessary region is punched out by using an unnecessary region removing machine while the base 30 is overlapped with the cover layer 14 to form a plurality of rectangular through-going windows. The windows are the first window 11a and the second window 14a. In addition, as a structure other than the above, the unnecessary region may be punched out in advance to form rectangular through-going windows, thereby omitting the unnecessary region removing step S2.

[0051] In the first bonding step S3, the second conductor 22 and the third conductor 23 are ultrasonically bonded to each other at a portion of the workpiece where the unnecessary region is removed, using a first bonding machine.

[0052] In the second bonding step S4, the second bonding machine is used to ultrasonically bond the second conductor 22 to the grounding portion 31c at the third window portion 14b and the fourth window portion 14c in the workpiece, and to ultrasonically bond the second conductor 22 to the second grounding conductor 42. As a configuration other than the above, the order of the first bonding step S3 and the second bonding step S4 may be switched, or the first bonding step S3 and the second bonding step S4 may be performed simultaneously.

[0053] like Figure 6A to Figure 6C As shown, as an example, when ultrasonically bonding the second conductor 22 to the grounding portion 31c, an anvil 51 abutting against the first shielding member 35 from above and a horn 52 which is opposite to the anvil 51 and has a cone abutting against the grounding portion 31c from below arranged at a prescribed interval are used, the horn 52 is inserted from a direction opposite to the anvil 51 to form a through hole 23a in the third conductor 23, and then the horn 52 is abutted against the grounding portion 31c, and the second conductor 22 and the grounding portion 31c are ultrasonically bonded through the anvil 51 and the horn 52. As an example, when ultrasonically bonding the second conductor 22 and the second grounding conductor 42, an anvil 51 that abuts the first shielding member 35 from above and a welding head 52 that is opposite to the anvil 51 and has a cone that abuts the second grounding conductor 42 from below arranged at a prescribed interval are used. The welding head 52 is inserted from a direction opposite to the anvil 51 to form a through hole 23a in the third conductor 23, and then the welding head 52 is abutted against the second grounding conductor 42, and the second conductor 22 and the second grounding conductor 42 are ultrasonically bonded together through the anvil 51 and the welding head 52.

[0054] As an example, the surface of the anvil 51 that contacts the first shield 35 is a 0.2 mm×0.2 mm front end quadrangular truncated pyramid with a protrusion angle of 45 degrees arranged in a row with a pitch of 1.13 mm. As an example, the welding head 52 is a 0.2 mm diameter front end circular truncated pyramid arranged in a row with a pitch of 1.13 mm.

[0055] In the thermocompression bonding step S5 , the workpieces are thermocompressed together using a roller press using a thermocompression bonding machine, thereby thermocompressing the cover layer 14 and the first substrate 11 , the second substrate 12 and the cover layer 14 , and the third substrate 13 and the first substrate 11 .

[0056] In the inspection step S6, as an example, by bringing the contact pins of the inspection machine into contact with the antenna conductor 31 and the transmission line conductor 32 and energizing them, it is inspected whether the antenna conductor 31 and the transmission line conductor 32 are disconnected and whether the conduction level is within a normal range. In the segmentation step S7, the workpiece is punched out along a predetermined cutting line using a punching knife of the segmentation and extraction machine. In this way, the antenna 1 with a transmission line of this embodiment is manufactured.

[0057] [Example]

[0058] The first substrate 11 of the antenna with transmission line 1 of the embodiment is made of fluororesin (PFA). The covering layer 14 is made of fluororesin (PFA). The second substrate 12 is made of polyimide resin (PE). The third substrate 13 is made of polyimide resin (PE). The first conductor 21, the second conductor 22 and the third conductor 23 are made of copper and have a thickness of 12 μm. As an example, the total length of the antenna with transmission line 1 of the embodiment is 202 mm, the thickness is 0.348 mm, the length of the antenna conductor 31 is 49 mm, the width of the antenna conductor 31 is 11.0 mm, and the width of the transmission line conductor 32 is 5.0 mm. The characteristics of the prototype of the embodiment and the commercial product of the substrate antenna + coaxial cable were compared, and it was confirmed that the signal reflection and transmission loss of the prototype of the embodiment were suppressed compared with the commercial product, and the characteristics were greatly improved.

[0059] In the above-mentioned embodiment, PFA is used for the first substrate 11 and the covering layer 14, but it is not limited to this example, and known thermoplastic resins can be applied. The above-mentioned embodiment describes the antenna 1 with a single body with a transmission line, but it is not limited to this example. It can also be configured to be equipped with multiple antennas 1 with transmission lines. The antenna 1 with a transmission line can be set to an L shape or an I shape when viewed from above, and can be set to any shape according to the wiring specifications when built into an electronic device. The antenna 1 with a transmission line can set the antenna part to any shape according to a known high-frequency band. The present invention is not limited to the embodiments described above, and various changes can be made without departing from the scope of the present invention.

Claims

1. An antenna with a transmission line, characterized in that: The antenna with transmission line has: a first substrate having a first conductor formed thereon; a covering layer covering the first conductor; a second substrate having a second conductor formed thereon; and a third substrate having a third conductor formed thereon, The cover layer is thermally pressed to the first substrate, the second substrate is thermally pressed to the cover layer, and the third substrate is thermally pressed to the first substrate. The first conductor has: Antenna conductor; a transmission line conductor connected to a power supply portion of the antenna conductor; as well as a first ground conductor close to an end of the transmission line conductor, The second conductor is ultrasonically bonded to the ground portion of the antenna conductor. The second conductor and the third conductor are ultrasonically bonded to each other in a state of surrounding the transmission line conductor.

2. The antenna with a transmission line according to claim 1, characterized in that: The first conductor includes a second ground conductor close to the transmission line conductor, and the second ground conductor is arranged to face the ground portion with the transmission line conductor interposed therebetween. The third conductor has a plurality of through holes formed at a position overlapping the ground portion when viewed from below.

3. The antenna with a transmission line according to claim 1 or 2, characterized in that: The first substrate and the covering layer are made of fluororesin, the antenna conductor has an inverted F-shaped antenna portion, the transmission line conductor has a straight portion extending linearly from the end portion and a bent portion bent from the straight portion, and the bent portion is connected to the power supply portion.

4. The antenna with a transmission line according to claim 1 or 2, characterized in that: The second conductor and the third conductor are both L-shaped in a plan view, and their outer shapes are set to have the same size.

5. A method for manufacturing an antenna with a transmission line, manufacturing an antenna with a transmission line, the antenna with a transmission line is configured to have: a first substrate, which is formed with a first conductor; a covering layer, which covers the first conductor; a second substrate, which is formed with a second conductor; and a third substrate, which is formed with a third conductor, the covering layer is thermally pressed to the first substrate, the second substrate is thermally pressed to the covering layer, and the third substrate is thermally pressed to the first substrate, the first conductor has: an antenna conductor; a transmission line conductor, which is connected to a power supply portion of the antenna conductor; and a first ground conductor, which is close to an end of the transmission line conductor, characterized in that The second conductor is ultrasonically bonded to a ground portion of the antenna conductor, and the second conductor and the third conductor are ultrasonically bonded to each other in a state of surrounding the transmission line conductor.

6. The method for manufacturing an antenna with a transmission line according to claim 5, characterized in that: The first conductor includes a second ground conductor close to the transmission line conductor, and the second ground conductor is arranged to face the ground portion with the transmission line conductor interposed therebetween. The second conductor and the third conductor are overlapped with the grounding portion, the anvil is made to abut against the second conductor, a welding head having cones arranged at a specified interval is inserted from a direction opposite to the anvil and abuts against the grounding portion, and the third conductor and the grounding portion are ultrasonically joined by the anvil and the welding head.

7. The method for manufacturing an antenna with a transmission line according to claim 5 or 6, characterized in that: The first substrate and the covering layer are made of fluororesin, the antenna conductor has an inverted F-shaped antenna portion, the transmission line conductor has a straight portion extending linearly from the end portion and a bent portion bent from the straight portion, and the bent portion is connected to the power supply portion.

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