Antenna and wireless communication device

Abstract

To miniaturize a plurality of antennas to which power is supplied independently of each other.SOLUTION: The antenna includes a first conductor including a first end portion, an intermediate portion, and a second end portion, a second conductor including one end portion connected to the intermediate portion and the other end portion connected to a ground, a first feeding portion configured to input and output a first signal having a wavelength λ 1 to and from the first conductor at a first feeding position, and a second feeding portion configured to input and output a second signal having a wavelength λ 2 to and from the first conductor at a second feeding position. A first section from the second end portion to the other end portion via the intermediate portion has an electrical length of λ 1 * (1 / 8) or more and λ 1 * (3 / 8) or less, a second section from the second feed position to the other end portion via the intermediate portion has an electrical length of λ 2 * (1 / 8) or more and λ 2 * (5 / 8) or less, and the second conductor has a width of λ 1 * (1 / 16) or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to antennas and wireless communication devices. [Background technology]

[0002] Patent Document 1 discloses a mobile terminal. In the mobile terminal, two slits divide the frame into a first conductive segment, a second conductive segment, and a third conductive segment. The third conductive segment has a feed point. Each of the first conductive segment and the second conductive segment is coupled to the third conductive segment and fed by one slit. The third conductive segment serves as an antenna for frequencies between 700 MHz and 960 MHz. The first conductive segment and the portion of the third conductive segment located between the feed point and the first conductive segment serve as an antenna for frequencies between 1710 MHz and 2170 MHz. The second conductive segment and the portion of the third conductive segment located between the feed point and the second conductive segment serve as an antenna for frequencies between 2300 MHz and 2700 MHz. This enables the mobile terminal to support 2G, 3G, and 4G, and the antenna structure is compact (paragraphs 0019 and 0020). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-524166 Summary of the Invention [Problem to be solved by the invention]

[0004] Modern mobile devices are equipped with multiple antennas, such as an antenna for cellular communications, an antenna for Wi-Fi® communications, an antenna for receiving Global Positioning System (GPS) signals, and other antennas for other purposes. These multiple antennas transmit and receive radio waves at different frequencies. For this reason, it is desirable for these multiple antennas to be powered independently of each other.

[0005] However, the space available for arranging the multiple antennas in a mobile terminal is limited, which necessitates miniaturization of the multiple antennas.

[0006] In view of this problem, an aspect of the present disclosure aims to, for example, miniaturize a plurality of antennas that are fed independently of each other. [Means for solving the problem]

[0007] The antenna of a first aspect of the present disclosure includes a ground, a first end not connected to the ground, an intermediate portion, and a second end not connected to the ground, a first conductor extending from the first end to the second end via the intermediate portion, a second conductor having one end connected to the intermediate portion and the other end connected to the ground, extending from the one end to the other end, a first feeding portion that inputs and outputs a first signal having a wavelength λ1 to and from the first conductor at a first feeding position closer to the first end than the intermediate portion, and a second conductor that is closer to the second end than the intermediate portion. a second feeding section that inputs and outputs a second signal having a wavelength λ2 to the first conductor at a second feeding position, wherein a first section provided in the first conductor and the second conductor from the second end via the intermediate section to the other end has an electrical length of λ1×(1 / 8) or more and λ1×(3 / 8) or less, a second section provided in the first conductor and the second conductor from the second feeding position via the intermediate section to the other end has an electrical length of λ2×(1 / 8) or more and λ2×(5 / 8) or less, and the second conductor has a width of λ1×(1 / 16) or less.

[0008] A wireless communication device according to a second aspect of the present disclosure includes an antenna according to the first aspect of the present disclosure, a first circuit that inputs and outputs the first signal to and from the first power supply unit, and a second circuit that inputs and outputs the second signal to and from the second power supply unit. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram of a wireless communication device according to a first embodiment. [Figure 2] 2 is a plan view of an antenna provided in the wireless communication device of the first embodiment. FIG. [Figure 3] FIG. 10 is a plan view of an antenna according to a reference example. [Figure 4] FIG. 10 is a plan view of an antenna provided in a wireless communication device according to a second embodiment. [Figure 5] 10 is a graph showing frequency characteristics of an S parameter S21 of a filter of an antenna provided in a wireless communication device of the second embodiment. [Figure 6] FIG. 10 is a block diagram showing a first configuration example of a filter of an antenna provided in a wireless communication device of a second embodiment. [Figure 7] FIG. 4 is a block diagram showing a second configuration example of the filter of the antenna provided in the wireless communication device of the first embodiment. [Figure 8] FIG. 11 is a plan view of an antenna provided in a wireless communication device according to a third embodiment. [Figure 9] FIG. 10 is a plan view of an antenna provided in a wireless communication device according to a fourth embodiment. [Figure 10] FIG. 11 is a plan view of an antenna provided in a wireless communication device according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0011] 1. First embodiment 1.1 Radio communication device FIG. 1 is a block diagram of a wireless communication device according to the first embodiment.

[0012] The wireless communication device 1 of the first embodiment shown in Fig. 1 is built into a smartphone. The wireless communication device 1 may be built into a mobile communication terminal other than a smartphone. For example, the wireless communication device 1 may be built into a feature phone, a tablet, etc. The wireless communication device 1 may be built into an electronic device other than a mobile communication terminal.

[0013] The wireless communication device 1 transmits and receives a first radio wave RW1 and a second radio wave RW2. Transmitting and receiving the first radio wave RW1 means transmitting and receiving both the first radio wave RW1, or transmitting and receiving only one of the first radio wave RW1. Transmitting and receiving the second radio wave RW2 means transmitting and receiving both the second radio wave RW2, or receiving only one of the second radio wave RW2. The first radio wave RW1 and the second radio wave RW2 have a first frequency f1 and a second frequency f2, respectively.

[0014] As shown in FIG. 1, the wireless communication device 1 includes a first circuit 101, a second circuit 102, and an antenna 103.

[0015] The first circuit 101 inputs and outputs a first signal S1 to the antenna 103. Inputting and outputting the first signal S1 to the antenna 103 means both inputting the first signal S1 from the antenna 103 and outputting the first signal S1 to the antenna 103, or only one of inputting the first signal S1 from the antenna 103 and outputting the first signal S1 to the antenna 103. The first signal S1 has a first frequency f1.

[0016] The second circuit 102 inputs and outputs a second signal S2 to the antenna 103. Inputting and outputting the second signal S2 to the antenna 103 means both inputting the second signal S2 from the antenna 103 and outputting the second signal S2 to the antenna 103, or only one of inputting the second signal S2 from the antenna 103 and outputting the second signal S2 to the antenna 103. The second signal S2 has a second frequency f2.

[0017] When a first signal S1 is input from the first circuit 101, the antenna 103 transmits a first radio wave RW1, and when the first radio wave RW1 is received, the antenna 103 outputs the first signal S1 to the first circuit 101. When a second signal S2 is input from the second circuit 102, the antenna 103 transmits a second radio wave RW2, and when the second radio wave RW2 is received, the antenna 103 outputs the second signal S2 to the second circuit 102.

[0018] 1.2 Antenna FIG. 2 is a plan view of an antenna provided in the wireless communication device of the first embodiment.

[0019] As shown in FIG. 2, the antenna 103 includes a ground 111, a first conductor 112, a second conductor 113, a first feed portion 114, and a second feed portion 115.

[0020] The ground 111 is made of a conductor. A ground potential is applied to the ground 111. The ground 111 has an outer periphery 111a. The ground 111 may be a pattern provided on the printed circuit board, or may be a plate-like member independent from the printed circuit board.

[0021] The first conductor 112 is separated from the ground 111. The first conductor 112 has a strip-like planar shape. The first conductor 112 extends linearly. The first conductor 112 may be curved. The first conductor 112 extends in a direction parallel to the outer periphery 111a of the ground 111. The first conductor 112 may extend in a direction inclined from that direction. The first conductor 112 may be a pattern provided on a printed circuit board, or may be a thin plate-like member, a rod-like member, or the like that is independent from the printed circuit board.

[0022] 2, the first conductor 112 includes a first end portion 121, an intermediate portion 122, and a second end portion 123. The first conductor 112 extends from the first end portion 121 to the second end portion 123 via the intermediate portion 122. The first end portion 121 and the second end portion 123 are not connected to the ground 111. The intermediate portion 122 is connected to the ground 111 via the second conductor 113.

[0023] The second conductor 113 is in contact with the ground 111 and the first conductor 112. The second conductor 113 has a strip-like planar shape. The second conductor 113 extends linearly. The second conductor 113 may be curved. The second conductor 113 extends in a direction perpendicular to the outer periphery 111a of the ground 111. The second conductor 113 may extend in a direction inclined from that direction. The second conductor 113 may be a pattern provided on a printed circuit board, a spring contact mounted on the printed circuit board, or a thin plate-like member, a rod-like member, or the like that is independent from the printed circuit board. The second conductor 113 has a length shorter than that of the first conductor 112.

[0024] 2, the second conductor 113 has one end 131 and the other end 132. The second conductor 113 extends from the one end 131 to the other end 132. The one end 131 is connected to the intermediate portion 122. The other end 132 is connected to the ground 111. In this way, the second conductor 113 electrically connects the intermediate portion 122 to the ground 111. A ground potential is applied to the other end 132.

[0025] The first feeding portion 114 is connected to the first circuit 101. As a result, a first signal S1 is input to and output from the first feeding portion 114. The first feeding portion 114 is directly connected to a first feeding position 124 of the first conductor 112. As a result, the first feeding portion 114 inputs and outputs the first signal S1 to and from the first conductor 112 at the first feeding position 124. The first feeding position 124 is located at the first end portion 121. It is sufficient that the first feeding position 124 is closer to the first end portion 121 than the intermediate portion 122. Therefore, the first feeding position 124 may be located at a position other than the first end portion 121.

[0026] The second feeding portion 115 is connected to the second circuit 102. As a result, a second signal S2 is input to and output from the second feeding portion 115. The second feeding portion 115 is directly connected to a second feeding position 125 of the first conductor 112. As a result, the second feeding portion 115 inputs and outputs the second signal S2 to and from the second conductor 113 at the second feeding position 125. The second feeding position 125 is located at the second end portion 123. It is sufficient that the second feeding position 125 is closer to the second end portion 123 than the intermediate portion 122. Therefore, the second feeding position 125 may be located at a position other than the second end portion 123.

[0027] 2 are sections that pass through the outer shape of the first conductor 112 and the outer shape of the second conductor 113. One end 131 shown in FIG. 2 is a portion that passes through the outer shape of the second conductor 113.

[0028] 1.3 Electrical length of the first section 2, the first conductor 112 and the second conductor 113 each have a first section 141 extending from the second end 123 to the other end 132 via the intermediate portion 122. The first conductor 112 has a feed section 146 extending from the first feed position 124 to the portion connected to the intermediate portion 122.

[0029] First power supply unit 114 is connected to first section 141 via power supply section 146 and intermediate section 122, and intermediate section 122 is connected to ground 111 via other end 132, which is the second conductor. This forms an antenna in which first power supply unit 114 serves as the antenna power supply section, other end 132 serves as the ground short-circuit section, and second end 123 serves as the antenna open end. Here, the section from the antenna open end to the ground short-circuit section, i.e., first section 141, has an electrical length of at least λ1×(1 / 8) but not more than λ1×(3 / 8), and is preferably adjusted to have an electrical length of λ1×(1 / 4).

[0030] According to this antenna configuration, the first signal S1 input to the first power supply 114 operates at frequency f1 and has a wavelength λ1, and therefore operates as a modified 1 / 4 wavelength inverted-F antenna in which a ground short circuit is provided on the open end side of the antenna power supply.

[0031] When the wireless communication device 1 wirelessly transmits the first signal S1, the first signal S1 is input from the first circuit 101 to the first power supply 114. The first signal S1 input to the first power supply 114 is transmitted as a wireless signal RW1 using a quarter-wave inverted-F antenna, with the first power supply 114 serving as an antenna power supply, the other end 132 serving as a ground short-circuit, and the second end 123 serving as an antenna open end, and the wireless communication device 1 can successfully transmit the signal wirelessly.

[0032] The first section 141 may have an electrical length shorter than λ1×(1 / 4). When the first section 141 has an electrical length shorter than λ1×(1 / 4), the antenna 103 can be made smaller.

[0033] 1.4 Electrical length of the second section As shown in FIG. 2, the first conductor 112 and the second conductor 113 include a second section 142 extending from the second feed position 125 to the other end 132 via the intermediate portion 122 .

[0034] Second feed section 115 is directly connected to second section 142. This forms an antenna in which second feed section 115 serves as the antenna feed section and the other end 132 serves as the ground short-circuit section. Here, the section from the antenna feed section to the ground short-circuit section, i.e., second section 142, has an electrical length of λ2×(3 / 8) or more and λ2×(5 / 8) or less, and is preferably adjusted to have an electrical length of λ2×(1 / 2).

[0035] According to this antenna configuration, the second signal S2 input to the second feeding point 115 operates at a frequency f2 and has a wavelength λ2, and therefore operates as a modified inverted-F antenna with a short tip of a half wavelength system in which the other end 132, which is the tip of the antenna relative to the antenna feeding point, is grounded.

[0036] When the wireless communication device 1 wirelessly transmits the second signal S2, the second signal is input from the second circuit to the second power supply 115. The second signal S2 input to the second power supply 115 is transmitted as a wireless signal RW2 using a half-wavelength inverted-F antenna with the second power supply 115 as an antenna feeder and the other end 132 shorted to ground, and the wireless communication device 1 can successfully transmit the signal wirelessly.

[0037] 1.5 Second conductor width The second conductor 113 has a width narrower than the wavelength λ1, for example, a width of λ1 × (1 / 16) or less. As a result, the second conductor 113 has a size of λ1 × (1 / 16) or less in the direction in which the first conductor 112 extends. This allows for strong electrical coupling between the feed section 146 including the first feed unit 114 and the first section 141. As a result, even if the first feed unit 114 is connected to the ground 111 via the second conductor 113 through the feed section 146, the first section 141 can be used as an antenna, making it easier to excite the first section 141 as an antenna. As a result, the ½ wavelength inverted-F antenna fed by second feeding unit 115 can be configured with second section 142, and the ¼ wavelength inverted-F antenna fed by first feeding unit 114 can be configured with first section 141 overlapping with second section 142. This allows the ¼ wavelength inverted-F antenna and the ½ wavelength inverted-F antenna to have a common section, and the ¼ wavelength inverted-F antenna and the ½ wavelength inverted-F antenna can be made smaller overall.

[0038] 1.6 Physical length of the fourth section The first conductor 112 and the second conductor 113 have a fourth section 144 that extends from the first end 121 to the other end 132 via the intermediate section 122. The resonant frequency of a quarter-wavelength inverted-F antenna fed by the first feeding section 114 is generally determined by the physical length of the first section 141. For this reason, the fourth section 144 only needs to have a length suitable for transmitting the first signal S1 from one of the first feeding section 114 and the first section 141 to the other of the first feeding section 114 and the first section 141, and has a length of, for example, λ1×(1 / 8) or more and λ1×(3 / 8) or less, and preferably has a length of approximately λ1×(1 / 4).

[0039] 1.7 Physical length of the section from the second end to the other end via the middle section When the second feeding position 125 is at the second end 123, the first section 141 forms a 1 / 4 wavelength inverted F antenna, and the second section 142 forms a 1 / 2 wavelength inverted F antenna, so the section from the second end 123 via the intermediate section 122 to the other end 132 must have an electrical length of approximately λ1 × (1 / 4) and an electrical length of λ2 × (1 / 2).

[0040] 1.8 Frequency of the first and second signals When second feeding position 125 is at second end 123, first section 141 and second section 142 have approximately the same length. Therefore, when first section 141 has an electrical length close to λ1×(1 / 4) and second section 142 has an electrical length close to λ2×(1 / 2), the relationship λ1×(1 / 4)=λ2×(1 / 2) is approximately satisfied. That is, the relationship λ1=2×λ2 is approximately satisfied, and the relationship f2=2×f1 is approximately satisfied.

[0041] The quarter-wave inverted-F antenna fed by the first feeding unit 114 is used, for example, as an antenna for receiving Global Positioning System (GPS) signals. The half-wave inverted-F antenna fed by the second feeding unit 115 is used, for example, as an antenna for 5GNR (5th Generation New Radio) communications. Therefore, the first frequency f1 of the first signal S1 input / output by the first feeding unit 114 belongs to, for example, the 1.6 GHz band. The second frequency f2 of the second signal S2 input / output by the second feeding unit 115 belongs to, for example, the 3.4 to 4.6 GHz band.

[0042] 1.9 Comparison between Reference Example and First Embodiment FIG. 3 is a plan view of the antenna of the reference example.

[0043] Section 940 and section 942 shown in FIG. 3 are sections that pass through the outer shape of first conductor 912 and the outer shape of second conductor 913 .

[0044] In the reference example, as shown in FIG. 3 , the second conductor 913 has a width greater than the wavelength λ1. Furthermore, a section 940 extending from the first feed position 924 to the other end 932 via the intermediate portion 922 has an electrical length of approximately λ1 × (½). Furthermore, a section 942 extending from the second feed position 925 to the other end 932 via the intermediate portion 922 has an electrical length of approximately λ2 × (½). The section 940 and the first feed portion 914 constitute a modified half-wavelength inverted-F antenna with a shorted tip, in which the tip of the antenna is grounded relative to the antenna feed portion. The section 942 and the second feed portion 915 constitute a modified half-wavelength inverted-F antenna with a shorted tip, in which the tip of the antenna is grounded relative to the antenna feed portion.

[0045] In the reference example, the second conductor 913, which has a width greater than the wavelength λ1, weakens the mutual coupling between the former 1 / 2 wavelength inverted-F antenna and the latter 1 / 2 wavelength inverted-F antenna, allowing the former 1 / 2 wavelength inverted-F antenna and the latter 1 / 2 wavelength inverted-F antenna to operate independently. Therefore, the first conductor 912 must have an electrical length of λ1 × (1 / 2) + λ2 × (1 / 2). However, the first frequency f1 of the first signal S1 and the second frequency f2 of the second signal S2 can be determined independently.

[0046] In the reference example, if the length of first conductor 912 is not changed, the lengths of section 940 and section 942 are shortened when the width of second conductor 913 is increased. Conversely, in the reference example, if the width of second conductor 913 is increased, in order to maintain a state in which section 940 has an electrical length of approximately λ1×(½) and section 942 has an electrical length of approximately λ2×(½), the length of first conductor 912 must be lengthened, and the volume of the antenna must be increased.

[0047] In the first embodiment, as shown in FIG. 2, the second conductor 113 has a width narrower than the wavelength λ1. The first section 141 extending from the second end 123 to the other end 132 via the intermediate section 122 has an electrical length of approximately λ1 × (1 / 4). The second section 142 extending from the second feed position 125 to the other end 132 via the intermediate section 122 has an electrical length of approximately λ2 × (1 / 2). The first section 141 and the first feed portion 114 form a quarter-wave inverted-F antenna. The second section 142 and the second feed portion 115 form a half-wave inverted-F antenna with a shorted tip.

[0048] In the first embodiment, the second conductor 113, which has a narrow width compared to the wavelength λ1, strengthens the mutual coupling between the ¼ wavelength inverted-F antenna and the ½ wavelength inverted-F antenna, allowing the ¼ wavelength inverted-F antenna and the ½ wavelength inverted-F antenna to operate mutually. Therefore, the first conductor 112 has an electrical length of λ1 × (¼) + λ2 × (½), which allows the antenna to be miniaturized by the electrical length of λ1 × (¼) compared to the reference example. Furthermore, the conductor width of the second conductor 113 can be configured to be narrow, further enabling the antenna to be miniaturized. However, the first frequency f1 of the first signal S1 and the second frequency f2 of the second signal S2 cannot be determined independently.

[0049] 2. Second embodiment The following describes the differences between the second embodiment and the first embodiment. For points that are not described, the second embodiment also employs the same configuration as that employed in the first embodiment.

[0050] FIG. 4 is a plan view of an antenna provided in the wireless communication device of the second embodiment.

[0051] In the second embodiment, the antenna 103 includes a filter 151, as shown in FIG.

[0052] The filter 151 is inserted between the second feeding position 125 and the second feeding section 115. Therefore, the second feeding section 115 is connected to the second feeding position 125 via the filter 151.

[0053] The filter 151 has a high impedance at the first frequency f1 of the first signal S1. The fact that the filter 151 has a high impedance means that the impedance of the filter 151 is higher than the impedance between the second feeding part 115 and the second feeding location 125 when the second feeding part 115 and the second feeding location 125 are directly connected to each other.

[0054] On the other hand, the filter 151 has an impedance close to 0 at the second frequency f2 of the second signal S2.

[0055] FIG. 5 shows the S parameter S of the filter of the antenna provided in the wireless communication device of the second embodiment. 21 10 is a graph showing frequency characteristics of

[0056] In the graph of Figure 5, the horizontal axis is frequency, and the S-parameter S 21 is taken on the vertical axis.

[0057] The S-parameter S shown in Figure 5 21 is the S-parameter S of a four-terminal network having an input terminal pair consisting of one terminal of the filter 151 and the ground 111 and an output terminal consisting of the other terminal of the filter 151 and the ground 111. 21 The S parameter S 21 The frequency characteristic of S parameter S indicates the frequency characteristic of the insertion loss of the filter 151. 21 A smaller value means that the insertion loss of the filter 151 increases.

[0058] As shown in Figure 5, the S-parameter S 21 becomes significantly small at the first frequency f1 of the first signal S1, preferably having a value of −10 dB or less, and more preferably having a value of −20 dB or less.

[0059] The filter 151, which has a high impedance at the first frequency f1 of the first signal S1, acts as an inhibitor that inhibits passage of the first signal S1. By inserting such an inhibitor between the second feed point 125 and the second feed portion 115, the antenna 103 behaves at the first frequency f1 of the first signal S1 in the same manner as when the second feed portion 115 is not connected to the second feed point 125. This reduces the influence of the second feed portion 115 and the second circuit 102 when the first section 141 is excited as the first feed portion 114 inputs and outputs the first signal S1 to and from the first conductor 112. This allows the resonant frequency of the inverted-F antenna, which is composed of the first feed portion 114, the feed section 146, the ground short-circuit portion at the other end 132, and the second section 142, to be stably maintained at the first frequency f1 of the first signal S1. Furthermore, since it becomes possible to suppress loss caused by connecting second feeding section 115 at first frequency f1, it becomes possible to improve antenna performance.

[0060] FIG. 6 is a block diagram showing a first configuration example of a filter of an antenna provided in a wireless communication device according to the second embodiment.

[0061] In the first exemplary configuration shown in FIG. 6 , the filter 151 includes a notch filter 161. The notch filter 161 includes an inductor 171 and a capacitor 172. One terminal of the inductor 171 and one terminal of the capacitor 172 are electrically connected to each other and to the second power feed point 125. The other terminal of the inductor 171 and the other terminal of the capacitor 172 are electrically connected to each other and to the second power feed point 115. As a result, the inductor 171 and the capacitor 172 are electrically connected in parallel to form a parallel resonant circuit. The inductance of the inductor 171 and the capacitance of the capacitor 172 are determined so that the resonant frequency of the parallel resonant circuit is close to the first frequency f1 of the first signal S1. This configuration can be realized by using one inductor and one capacitor, which is inexpensive and allows the constants to be easily selected. Furthermore, the frequency f2 used in the second circuit 102 is approximately twice the frequency f1, so there is no need to design the filter characteristics to be steep, and it is easy to achieve.

[0062] FIG. 7 is a block diagram showing a second configuration example of the filter of the antenna provided in the wireless communication device of the first embodiment.

[0063] 7, the filter 151 is made up of a passive element 162. The passive element 162 is made up of an element or element network that has high impedance at the first frequency f1 of the first signal S1.

[0064] The filter 151 may be replaced with another type of inhibition unit. For example, the filter 151 may be replaced with a switch that is controlled to be turned off when the first power supply unit 114 inputs and outputs the first signal S1 and to be turned on when the second power supply unit 115 inputs and outputs the second signal S2.

[0065] 3 Third embodiment The following describes the differences between the third embodiment and the first embodiment. For points that are not described, the third embodiment also employs the same configuration as that employed in the first embodiment.

[0066] FIG. 8 is a plan view of an antenna provided in a wireless communication device according to the third embodiment.

[0067] In the third embodiment, as shown in FIG. 8 , the second feed position 125 is located between the second end 123 and the intermediate portion 122. Therefore, the first conductor 112 and the second conductor 113 have a second section 142 extending from the second feed position 125 to the other end 132 via the intermediate portion 122. The first conductor 112 has a third section 143 extending from the second end 123 to the second feed position 125. The third section 143 has an electrical length of λ2 × (1 / 8) or more and λ2 × (3 / 8) or less, preferably λ2 × (1 / 4). When the third section 143 has an electrical length close to λ2 × (1 / 4), a quarter-wave inverted-F antenna is configured, with the second feed position 115 serving as an antenna feed point, the other end 132 serving as a ground short-circuit point, and the second end 123 serving as an antenna open end.

[0068] In the third embodiment, the second feeding position 125 is located between the second end portion 123 and the middle portion 122, so that the first frequency f1 of the first signal S1 and the second frequency f2 of the second signal S2 can be determined independently.

[0069] 4 Fourth embodiment The following describes the differences between the fourth embodiment and the third embodiment. For points that are not described, the fourth embodiment also employs the same configuration as that employed in the third embodiment.

[0070] FIG. 9 is a plan view of an antenna provided in a wireless communication device according to the fourth embodiment.

[0071] In the fourth embodiment, as shown in FIG. 9, the antenna 103 includes a filter 151.

[0072] The filter 151 of the antenna 103 included in the wireless communication device of the fourth embodiment is the same as the filter 151 of the antenna 103 included in the wireless communication device of the second embodiment. Therefore, in the fourth embodiment, the filter 151 is also inserted between the second feed position 125 and the second feed unit 115. The filter 151 serves as an inhibitor that inhibits passage of the first signal S1. By inserting such an inhibitor between the second feed position 125 and the second feed unit 115, the resonant frequency of the inverted-F antenna formed by the first feed unit 114, the feed section 146, the ground short-circuit portion of the other end 132, and the second section 142 can be stably maintained at the first frequency f1 of the first signal S1. Furthermore, it is possible to suppress loss caused by connecting the second feed unit 115 at the first frequency f1, thereby improving antenna performance.

[0073] 5 Fifth embodiment The following describes the differences between the fifth embodiment and the first embodiment. For points that are not described, the fifth embodiment also employs the same configuration as that employed in the first embodiment.

[0074] FIG. 10 is a plan view of an antenna provided in a wireless communication device according to the fifth embodiment.

[0075] In the fifth embodiment, as shown in FIG. 10 , the first feed position 124 is positioned closer to the intermediate portion 122 than the first end portion 121. Therefore, the first feed position 124 is located between the first end portion 121 and the intermediate portion 122. The resonant frequency of a quarter-wave inverted-F antenna fed by the first feed portion 114 is generally determined by the physical length of the first section 141. Therefore, even if the first feed position 124 is moved closer to the intermediate portion 122 than the first end portion 121, the resonant frequency of the quarter-wave inverted-F antenna does not change significantly. Therefore, because the first feed position 124 can be moved closer to the intermediate portion 122 than the first end portion 121, the first feed position 124 can be freely set to a certain extent.

[0076] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0077] 1. Radio communication device 101 First Circuit 102 Second Circuit 103 Antenna 111 Grand 111a outer circumference 112 First Conductor 113 Second Conductor 114 First power supply 115 Second power supply 121 first end 122 Middle section 123 Second End 124 First power supply position 125 Second power supply position 131 One end 132 other end 141 First Section 142 Second Section 143 Third Section 144 Fourth Section 146 Power Supply Section 151 filters 161 Notch Filter 162 Passive Elements 171 Inductor 172 Capacitor 912 First Conductor 913 Second Conductor 914 First Power Supply Unit 915 Second Power Supply 922 Middle section 924 First Power Supply Location 925 Second power supply location 932 other end 940 sections 942 sections RW1 First Radio Wave RW2 Second Radio Wave S1 First signal S2 Second signal

Claims

1. Grand and a first conductor having a first end not connected to the ground, an intermediate portion, and a second end not connected to the ground, the first conductor extending from the first end to the second end via the intermediate portion; a second conductor having one end connected to the intermediate portion and the other end connected to the ground, the second conductor extending from the one end to the other end; a first feeding portion that inputs and outputs a first signal having a wavelength λ1 to and from the first conductor at a first feeding position that is closer to the first end portion than the intermediate portion; a second feeding portion that inputs and outputs a second signal having a wavelength λ2 to and from the first conductor at a second feeding position that is closer to the second end portion than the intermediate portion; Equipped with a first section provided in the first conductor and the second conductor, the first section extending from the second end to the other end via the intermediate section, has an electrical length of λ1×(1 / 8) or more and λ1×(3 / 8) or less; a second section provided in the first conductor and the second conductor, the second section extending from the second feeding position to the other end via the intermediate section, has an electrical length of λ2×(1 / 8) or more and λ2×(5 / 8) or less; The second conductor has a width of λ1×(1 / 16) or less. antenna.

2. The first section has an electrical length of λ1×(1 / 4). The antenna of claim 1 .

3. The second section has an electrical length of λ2×(3 / 8) or more and λ2×(5 / 8) or less.

3. The antenna according to claim 1 or 2.

4. The second section has an electrical length of λ2×(½).

4. The antenna of claim 3.

5. the second feeding position is between the second end and the intermediate portion; The second section has an electrical length of λ2×(1 / 8) or more and λ2×(3 / 8) or less.

3. The antenna according to claim 1 or 2.

6. The second section has an electrical length of λ2×(1 / 4).

6. The antenna of claim 5.

7. A third section of the first conductor extending from the second end to the second feeding position has an electrical length of λ2×(1 / 8) or more and λ2×(3 / 8) or less. The antenna of claim 5.

8. The third section has an electrical length of λ2×(1 / 4).

8. The antenna of claim 7.

9. an obstruction portion that is inserted between the second power feeding position and the second power feeding portion and obstructs passage of the first signal; 3. The antenna according to claim 1 or 2.

10. The first feeding position is between the first end and the middle portion.

3. The antenna according to claim 1 or 2.

11. A fourth section provided in the first conductor and the second conductor, which extends from the first end to the other end via the intermediate section, has an electrical length of λ1×(1 / 8) or more and λ1×(3 / 8) or less.

3. The antenna according to claim 1 or 2.

12. the first signal has a first frequency belonging to a 1.6 GHz band; The second signal has a second frequency in the 3.4 to 4.6 GHz band.

3. The antenna according to claim 1 or 2.

13. An antenna according to claim 1 or 2; a first circuit that inputs and outputs the first signal to and from the first power supply unit; a second circuit for inputting and outputting the second signal to and from the second power supply unit; A wireless communication device comprising:

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