Power splitter combiner

Abstract

A power distribution combiner (1) comprises: a combining terminal (11), two distribution terminals (12a, 12b), an absorption resistor (13) connected between the two distribution terminals, a first transmission line (14a) connected between the combining terminal and one of the two distribution terminals, a second transmission line (14b) connected between the combining terminal and the other of the two distribution terminals and having a length shorter than that of the first transmission line, and at least one first open stub (15) connected to the second transmission line.

Description

Technical Field

[0001] The present invention relates to a power splitting combiner. Background Art

[0002] In recent years, the development of wireless communication modules that use high-frequency signals such as microwaves and millimeter waves for wireless communication has become increasingly popular. In such wireless communication modules, power splitters are used to distribute and combine the power of high-frequency signals. A representative example of such power splitters is the Wilkinson-type power splitter. A Wilkinson-type power splitter comprises one combining terminal, two distribution terminals, an absorption resistor connected between the distribution terminals, a quarter-wavelength line (90° line) connected between the combining terminal and one distribution terminal, and a quarter-wavelength line connected between the combining terminal and the other distribution terminal.

[0003] Patent Document 1 below discloses an example of a multi-stage Wilkinson type power splitter / combiner in which Wilkinson type power splitters / combiners are connected by wiring to form a racetrack structure of N stages (N is an integer greater than or equal to 2). In such a multi-stage Wilkinson type power splitter / combiner, one combining terminal, two N Distribution terminals and (2 N -1) Wilkinson type power splitter combiner.

[0004] Patent Document 1: Japanese Patent No. 3209086

[0005] However, the Wilkinson-type power splitter combiners that constitute the multi-stage Wilkinson-type power splitter combiner disclosed in Patent Document 1 above each have a structure in which quarter-wavelength lines are arranged symmetrically about a straight line passing through the midpoints of one combining terminal and two splitting terminals. Furthermore, the multiple Wilkinson-type power splitter combiners are connected using connecting wiring to form a racetrack structure. Therefore, the multi-stage Wilkinson-type power splitter combiner has a problem of a large dedicated area (footprint) (large size). Furthermore, in the multi-stage Wilkinson-type power splitter combiner disclosed in Patent Document 1 above, the Wilkinson-type power splitter combiners are connected by connecting wiring, which leads to an increase in loss due to the provision of the connecting wiring. Summary of the Invention

[0006] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a power splitter and combiner that is smaller than conventional ones and has lower loss.

[0007] A power distribution combiner 1 to 3 according to one embodiment of the present invention includes: a combining terminal 11, two distribution terminals 12a and 12b, an absorption resistor 13 connected between the two distribution terminals, a first transmission line 14a connected between the combining terminal and one of the two distribution terminals, a second transmission line 14b connected between the combining terminal and the other of the two distribution terminals and having a length shorter than that of the first transmission line, and at least one first open stub 15 connected to the second transmission line.

[0008] In the power splitter combiner of the above embodiment, an absorption resistor is connected between two split terminals, a first transmission line is connected between the combining terminal and one of the two split terminals, and a second transmission line is connected between the combining terminal and the other of the two split terminals. The second transmission line is shorter than the first transmission line, and at least one first open stub is connected to the second transmission line.

[0009] In this manner, the power splitter and combiner of this embodiment can have the second transmission line shorter than the first transmission line, thereby increasing the degree of layout flexibility. For example, if the power splitter and combiner has a multi-stage connection structure, the combining terminals of a power splitter and combiner in a arbitrarily selected first stage among the multiple stages can be positioned to correspond to the dividing terminals of a power splitter and combiner in a second stage following the first stage. This eliminates the need for conventional wiring connections, enabling a more compact power splitter and combiner and reducing losses. Furthermore, by supplementing the length of the second transmission line with the first open stub connected to the second transmission line, the characteristics of the power splitter and combiner can be brought closer to ideal characteristics (characteristics when the first and second transmission lines have the same length). Here, the "arbitrarily selected first stage among the multiple stages" does not limit the first stage in the multi-stage connection structure of the power splitter and combiner. The second and third stages in the multi-stage connection structure may also correspond to the "first stage."

[0010] In the power splitter and combiner of the above aspect, the characteristic impedance of the second transmission line may be higher than the characteristic impedance of the first transmission line.

[0011] In the power splitter and combiner of the above aspect, the first open-circuited stub may be connected to a central portion of the second transmission line.

[0012] In the power splitter and combiner of the above aspect, a plurality of the first open stubs may be connected to the second transmission line so as to divide the second transmission line into equal parts.

[0013] In the power splitter and combiner of the above aspect, the electrical length of the first transmission line may be a length corresponding to a quarter wavelength of a predetermined center frequency.

[0014] The power splitter and combiner of the above aspect may include at least one second open stub (16) connected to the first transmission line.

[0015] In the power splitter and combiner of the above aspect, the length of the second open-circuited stub may be shorter than the length of the first open-circuited stub.

[0016] In the power splitter and combiner of the above aspect, the electrical length of the first transmission line may be shorter than a length corresponding to a quarter wavelength of a predetermined center frequency.

[0017] In the power splitter and combiner of the above aspect, the first transmission line and the second transmission line may extend parallel to each other and bend in the same direction.

[0018] According to one embodiment of the present invention, it is possible to provide a power distribution combiner that is smaller than conventional ones and has reduced loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a plan view showing the main structure of a power distribution combiner according to one embodiment.

[0020] Figure 2 Yes Figure 1 The equivalent circuit diagram of the power splitter combiner is shown.

[0021] Figure 3 This means that the center frequency is designed to be 28 [GHz] Figure 2 A graph of the simulation results for the case of the power splitter combiner is shown.

[0022] Figure 4A 1 is a diagram showing an equivalent circuit of a power distribution combiner serving as a comparison object.

[0023] Figure 4B 1 is a diagram showing an equivalent circuit of a power distribution combiner serving as a comparison object.

[0024] Figure 5A Yes Figure 4A A graph of the simulation results of the power splitter combiner is shown.

[0025] Figure 5B Yes Figure 4B A graph of the simulation results of the power splitter combiner is shown.

[0026] Figure 6 It is a plan view showing the main structure of a power distribution combiner according to a modified example of one embodiment.

[0027] Figure 7 It is a plan view showing the main structure of a power distribution combiner according to another modified example of one embodiment. DETAILED DESCRIPTION

[0028] A power distribution combiner according to one embodiment of the present invention will be described in detail below with reference to the accompanying drawings. To facilitate understanding, the positional relationships of the various components will be described below with reference to the XY orthogonal coordinate system set in the drawings, as needed. Furthermore, in the drawings referenced below, the dimensions of the various components will be appropriately altered for ease of understanding.

[0029] Figure 1 1 is a top view showing the main structure of a power distribution combiner according to one embodiment. Figure 1 As shown, the power splitter combiner 1 of this embodiment includes a combining terminal 11, splitting terminals 12a and 12b, an absorption resistor 13, a transmission line 14a (first transmission line), a transmission line 14b (second transmission line), and an open stub 15 (first open stub). Furthermore, the power splitter combiner 1 is formed on a substrate (a plate-shaped dielectric substrate).

[0030] Power splitter / combiner 1 splits the power of a high-frequency signal input from combining terminal 11, outputting the split high-frequency signals from split terminals 12a and 12b. It also combines the power of the high-frequency signals input from split terminals 12a and 12b, outputting the combined high-frequency signal from combining terminal 11. In other words, power splitter / combiner 1 has a structure capable of functioning both as a power splitter for high-frequency signals and as a power combiner for high-frequency signals. Furthermore, power splitter / combiner 1 has the same structure as a Wilkinson-type power splitter / combiner. The high-frequency signals input and output by power splitter / combiner 1 can be, for example, signals in the microwave band (frequencies of approximately 300 MHz to 30 GHz) or signals in the millimeter wave band (frequencies of approximately 30 to 300 GHz).

[0031] Combining terminal 11 is a terminal for inputting a high-frequency signal for power distribution by power splitter combiner 1, or for outputting a high-frequency signal for power synthesis by power splitter combiner 1. Distribution terminals 12a and 12b are terminals for outputting a high-frequency signal for power distribution by power splitter combiner 1, or for inputting a high-frequency signal for power synthesis by power splitter combiner 1. Combining terminal 11 and distribution terminals 12a and 12b are formed, for example, on the surface of a substrate. If the substrate has a multilayer wiring structure, the layers on which combining terminal 11 and distribution terminals 12a and 12b are formed can be arbitrarily selected.

[0032] Absorption resistor 13 is a resistor used to provide isolation between distribution terminals 12a and 12b. It is located on the substrate surface between distribution terminals 12a and 12b. The electrical length of absorption resistor 13 (the electrical length between distribution terminals 12a and 12b) is preferably as close to zero as possible. This is because if the electrical length of absorption resistor 13 is too long, the phase rotation of the surrounding signal through absorption resistor 13 will not be 180°, which will degrade the isolation characteristics between distribution terminals 12a and 12b. Furthermore, the surrounding signal mentioned above is a high-frequency signal that flows from distribution terminal 12a to distribution terminal 12b through absorption resistor 13, or a high-frequency signal that flows from distribution terminal 12b to distribution terminal 12a through absorption resistor 13.

[0033] Transmission line 14a is a line for transmitting the high-frequency signal input to power splitter combiner 1. It is connected between combining terminal 11 and splitting terminal 12a. Transmission line 14a comprises a first straight portion P11 extending in the -X direction and a second straight portion P12 extending continuously from first straight portion P11 in the +Y direction. The electrical length of transmission line 14a is set to a length equivalent to one-quarter wavelength of a predetermined center frequency. In other words, transmission line 14a is a quarter-wavelength line (90° line). Such transmission line 14a is implemented, for example, in a microstrip line or a coplanar line.

[0034] Transmission line 14b, like transmission line 14a, is a line for transmitting high-frequency signals input to power splitter combiner 1. It is connected between combining terminal 11 and splitting terminal 12b. Transmission line 14b comprises a first straight portion P21 extending in the +Y direction, a second straight portion P22 extending continuously from first straight portion P21 in the -X direction, and a third straight portion P23 extending continuously from second straight portion P22 in the +Y direction. The electrical length of transmission line 14b is set to be shorter than a length corresponding to a quarter wavelength of a predetermined center frequency. This is because transmission line 14b does not protrude toward the +X direction beyond the X-direction position of combining terminal 11, thereby miniaturizing power splitter combiner 1. Furthermore, transmission line 14b has a higher characteristic impedance than transmission line 14a. Similar to transmission line 14a, such transmission line 14b can be implemented, for example, in a microstrip line or a coplanar line.

[0035] like Figure 1 As shown, transmission lines 14a and 14b extend parallel to each other and bend in the same direction. Specifically, transmission lines 14a and 14b extend parallel to each other in the -Y direction from distribution terminals 12a and 12b, bend in the +X direction midway, and then extend parallel to each other in the +X direction. In other words, transmission lines 14a and 14b are asymmetrical with respect to a straight line extending in the Y direction and passing through the center of absorption resistor 13.

[0036] This arrangement allows combining terminal 11 to be positioned offset from a straight line extending in the Y direction and passing through the center of absorption resistor 13, thereby increasing the degree of freedom in the layout of power splitter combiner 1. Consequently, for example, if power splitter combiner 1 has a multi-stage connection structure, combining terminal 11 of a power splitter combiner 1 located in an arbitrarily selected first stage among the multiple stages can be positioned at the same position as a splitting terminal (not shown) of a power splitter combiner located in a second stage following the first stage. This eliminates the need for conventional wiring connections, enabling a more compact design and reducing losses compared to conventional designs.

[0037] Here, the terms "first level" and "second level" mean the relative relationship between two levels constituting a multi-level connection structure, and do not limit the first level and the second level following the first level in the multi-level connection structure.

[0038] For example, in a three-stage multi-stage connection structure, the second stage among the three stages may correspond to the "first stage", and in this case, the third stage among the three stages may correspond to the "second stage".

[0039] The above relationship also applies to a power distribution combiner having a multi-stage connection structure with four or more stages. For example, if the third stage among the four stages corresponds to the "first stage," the fourth stage corresponds to the "second stage," and if the second stage among the four stages corresponds to the "first stage," the third stage corresponds to the "second stage."

[0040] Open stub 15 complements the electrical length of transmission line 14b, which is set to be shorter than that of a quarter-wavelength line (90° line). Open stub 15 is preferably connected at a position that divides the length of transmission line 14b into two equal parts. However, it can be connected at a position offset from this position as long as the desired characteristics are achieved. Open stub 15 only needs to be connected to the center of transmission line 14b. The electrical length and characteristic impedance of open stub 15 are appropriately set.

[0041] Figure 2 Yes Figure 1 The equivalent circuit of the power splitter combiner is shown in FIG. Figure 2 In, with Figure 1 The structures shown in the figure are marked with the same reference numerals as those in the structure shown in the figure. Figure 2 As shown, power splitter combiner 1 is represented by a circuit having an absorption resistor 13 connected between splitting terminals 12a and 12b, a transmission line 14a connected between combining terminal 11 and splitting terminal 12a, a transmission line 14b connected between combining terminal 11 and splitting terminal 12b, and an open stub 15 connected to transmission line 14b. Furthermore, transmission line 14b is represented by two lines L1 and L2 connected in series, and open stub 15 is represented as a line with one end connected to the connection point of lines L1 and L2.

[0042] Figure 3 This means that the center frequency is designed to be 28 [GHz] Figure 2 The simulation results are shown in the chart of the power distribution combiner. Figure 2 The circuit parameters of the power splitter combiner 1 are obtained as shown.

[0043] Center frequency: 28 [GHz]

[0044] · Reference impedance of composite terminal 11: 32 [Ω]

[0045] · Reference impedance of distribution terminals 12a, 12b: 25 [Ω]

[0046] Resistance value of absorption resistor 13: 50 [Ω]

[0047] Electrical length of the transmission line 14a: Electrical length of a 1 / 4 wavelength line (90° line)

[0048] Characteristic impedance of transmission line 14a: 40 [Ω]

[0049] Electrical length of transmission line 14b: Electrical length of 70° line

[0050] (Electrical length of lines L1 and L2: electrical length of 35° line)

[0051] Characteristic impedance of transmission line 14b: 56 [Ω]

[0052] Electrical length of the open stub 15: Electrical length of the 26.4° line

[0053] Characteristic impedance of the open stub 15: 40 [Ω]

[0054] Here, Figure 3 The simulation results shown are compared with those of other power splitter combiners and investigated. Figure 4A 、 Figure 4B Each of them is a diagram showing an equivalent circuit of a power distribution combiner to be compared. Figure 4A 、 Figure 4B In, with Figure 2 The same structures are denoted by the same reference numerals.

[0055] Figure 4A The power splitter combiner 100 is shown as an alternative to Figure 2 The power splitter and combiner 1 shown has a structure in which the transmission line 14b and the stub 15 are opened and the transmission line 110 is provided. The circuit parameters of the transmission line 110 are as follows.

[0056] Electrical length of the transmission line 110: Electrical length of a quarter wavelength line (90° line)

[0057] Characteristic impedance of transmission line 110: 40 [Ω]

[0058] in other words, Figure 4A The power splitter 100 shown has a structure in which a transmission line 110 having the same electrical characteristics as the transmission line 14a is provided between the combining terminal 11 and the splitting terminal 12b. Figure 2 The circuit parameters of the power splitter combiner 1 shown are the same.

[0059] Figure 4B The power splitter combiner 200 shown is from Figure 2 The power splitter combiner 1 shown in the figure is a structure in which the open circuit stub 15 is deleted. Figure 4B The transmission line 210 in Figure 2 The transmission line 14b in is the same.

[0060] In addition, in other words, Figure 4B The power splitter combiner 200 shown has the Figure 4A The power splitter combiner 100 shown has a structure in which the electrical length of the transmission line 110 is simply shortened.

[0061] Figure 5A Yes Figure 4A The graphs of simulation results of the power splitter combiner are shown, Figure 5B Yes Figure 4B The simulation results of the power splitter combiner are shown in the graph. Figure 3 as well as Figure 5A 、 Figure 5B In the simulation results shown, reference numeral S11 represents the reflection characteristic of the combined terminal 11, reference numeral S22 represents the reflection characteristic of the distribution terminal 12a, reference numeral S33 represents the reflection characteristic of the distribution terminal 12b, and reference numeral S23 represents the isolation characteristic between the distribution terminals 12a and 12b.

[0062] First, if we refer to Figure 5A , it can be seen that the reflection characteristics of the combined terminal 11, the reflection characteristics of the distribution terminal 12a, the reflection characteristics of the distribution terminal 12b, and the isolation characteristics between the distribution terminals 12a and 12b are all extremely small at the center frequency (28 [GHz]). Figure 4A In the power splitter combiner 100 shown, the high frequency signal of the center frequency input to the combining terminal 11 or the high frequency signal of the center frequency input to the splitting terminals 12a and 12b is not reflected (or is hardly reflected). Figure 4A In the power distribution combiner 100 shown, the high-frequency signal of the center frequency does not flow around from the distribution terminal 12 a to the distribution terminal 12 b via the absorption resistor 13 (or hardly flows around).

[0063] Next, if you refer to Figure 5B , it can be seen that any one of the reflection characteristics of the combined terminal 11, the reflection characteristics of the distribution terminal 12a, the reflection characteristics of the distribution terminal 12b, and the isolation characteristics between the distribution terminals 12a and 12b is Figure 5A The results shown are quite different, and the frequency does not reach a minimum at the center frequency (28 [GHz]). Figure 4B In the power splitter combiner 200 shown, most of the high frequency signal of the center frequency input to the combining terminal 11 or the high frequency signal of the center frequency input to the splitting terminals 12a and 12b is reflected. Figure 4BIn the power distribution combiner 200 shown, most of the high-frequency signal having the center frequency flows from the distribution terminal 12 a to the distribution terminal 12 b via the absorption resistor 13 .

[0064] Then, if you refer to Figure 3 , then we can know that Figure 5A The results shown are the same, and the reflection characteristics of the combined terminal 11, the reflection characteristics of the distribution terminal 12a, the reflection characteristics of the distribution terminal 12b, and the isolation characteristics between the distribution terminals 12a and 12b are all substantially minimal at the center frequency (28 [GHz]). Figure 2 The power splitter combiner 1 shown, with Figure 4A The same as the power splitter combiner 100 shown, the high frequency signal of the center frequency input to the combining terminal 11 or the high frequency signal of the center frequency input to the splitting terminals 12a, 12b is not reflected (or is hardly reflected). Figure 2 The power splitter combiner 1 shown, with Figure 4A As in the illustrated power splitter and combiner 100 , the high-frequency signal of the center frequency does not flow around from the splitting terminal 12 a to the splitting terminal 12 b via the absorption resistor 13 (or hardly flows around).

[0065] As described above, the power splitter combiner 1 of this embodiment includes: an absorption resistor 13 connected between the split terminals 12a and 12b; a transmission line 14a connected between the combining terminal 11 and the split terminal 12a; and a transmission line 14b connected between the combining terminal 11 and the split terminal 12b. The length of the transmission line 14b is shorter than that of the transmission line 14a, and the characteristic impedance is higher than that of the transmission line 14a. On the other hand, an open stub 15 for adjusting the electrical length of the transmission line 14b is connected to the transmission line 14b. Thus, even if the transmission line 14b is shorter than the transmission line 14a, the characteristics of the power splitter combiner 1 can be made close to those of the transmission line 14b. Figure 5A The characteristics of an ideal power splitting combiner 100 are shown.

[0066] In the power distribution combiner 1 of this embodiment, the length of the transmission line 14b is set shorter than the length of the transmission line 14a. Figure 1 As shown, the transmission line 14b can be prevented from protruding toward the +X side beyond the position of the combining terminal 11 in the X direction, and thus the power distribution combiner 1 can be miniaturized.

[0067] In addition, in the power distribution combiner 1 of this embodiment, as Figure 1As shown, transmission lines 14a and 14b extend parallel to each other and bend in the same direction. In other words, transmission lines 14a and 14b are asymmetrical with respect to a straight line extending in the Y direction and passing through the center of absorption resistor 13. This allows combining terminal 11 to be positioned offset from the straight line extending in the Y direction and passing through the center of absorption resistor 13, thereby increasing the layout flexibility of power splitter combiner 1.

[0068] The power splitter combiner 1 has a greater degree of freedom in layout. For example, when the power splitter combiner 1 has a multi-stage connection structure, the combining terminal 11 of the power splitter combiner 1 can be positioned at the same location as the distribution terminal (not shown) of a downstream power splitter combiner (or, alternatively, the combining terminal 11 of the power splitter combiner 1 can be positioned close to the distribution terminal of the downstream power splitter combiner). This eliminates the need for conventionally required connection wiring, thereby enabling a multi-stage power splitter combiner that is smaller and has lower losses than conventional systems.

[0069] The above embodiment has been described, but the present invention is not limited to the above embodiment and can be freely changed within the scope of the present invention. For example, in the power splitter combiner 1 described in the above embodiment, an open stub 15 is connected to the transmission line 14b. However, if Figure 6 As shown, a plurality of open stubs 15 may also be connected to the transmission line 14b.

[0070] Figure 6 1 is a top view showing the main structure of a power distribution combiner according to a modified example of an embodiment. Figure 6 In the power splitter 2 shown, two open stubs 15 are connected to the transmission line 14b. Here, when a plurality of open stubs 15 are connected to the transmission line 14b, the open stubs 15 are preferably connected to the transmission line 14b in such a manner as to divide the transmission line 14b into equal parts. For example, Figure 6 In the illustrated example, two open stubs 15 are connected to the transmission line 14b so as to divide the transmission line 14b into three equal parts.

[0071] Furthermore, the number of open stubs 15 is not limited to 2, but may be 3 or more. In other words, when the number of the plurality of first open stubs is M (M is an integer greater than or equal to 2), the number of areas of the second transmission line becomes (M+1) by connecting the M first open stubs to the second transmission line.

[0072] In the power splitter and combiner 1 described in the above embodiment, the open stub 15 is connected to the transmission line 14b. Figure 7As shown, an open stub 16 (second open stub) may be connected to the transmission line 14a. Figure 7 1 is a top view showing the main structure of a power distribution combiner according to another modified example of an embodiment. Figure 7 In the power splitter and combiner 3 shown, one open stub 15 is connected to the transmission line 14b, and one open stub 16 is connected to the transmission line 14a. The length of the open stub 16 in the Y direction is shorter than that of the open stub 15.

[0073] exist Figure 7 In the illustrated power splitter and combiner 3, for example, when the electrical lengths of transmission lines 14a and 14b are both shorter than a length corresponding to a quarter wavelength of a predetermined center frequency, open stubs 15 and 16 are connected to transmission lines 14b and 14a, respectively. Open stubs 15 and 16 are preferably connected to the center portions of transmission lines 14b and 14a, respectively. Furthermore, the number of open stubs 15 and 16 may be one or more. When multiple open stubs 16 are connected to transmission line 14a, the open stubs 16 are preferably connected to transmission line 14a so as to divide transmission line 14a into equal parts.

[0074] In the above embodiment, the reference impedance of the combined terminal 11 is different from the reference impedance of the distribution terminals 12a and 12b. However, the reference impedance of the combined terminal 11 and the reference impedance of the distribution terminals 12a and 12b may be the same.

[0075] [Description of Reference Numerals]

[0076] 1 to 3 ...power distribution combiner; 11 ...combining terminal; 12a, 12b ...distribution terminals; 13 ...absorption resistor; 14a, 14b ...transmission line; 15, 16 ...open-circuit stub.

Claims

1. A power distribution combiner, characterized in that: have: 1 synthetic terminal; 2 distribution terminals; an absorption resistor connected between the two distribution terminals; a first transmission line connected between the combining terminal and one of the two distribution terminals; a second transmission line connected between the combining terminal and the other of the two distribution terminals and having a length shorter than that of the first transmission line; as well as at least one first open-circuit stub connected to the second transmission line, The characteristic impedance of the second transmission line is higher than the characteristic impedance of the first transmission line.

2. The power splitter according to claim 1, characterized in that: The first open stub is connected to a central portion of the second transmission line.

3. The power splitter combiner according to claim 1, wherein: A plurality of the first open stubs are connected to the second transmission line so as to divide the second transmission line into equal parts.

4. The power splitter and combiner according to any one of claims 1 to 3, characterized in that: The electrical length of the first transmission line is a length corresponding to a quarter wavelength of a predetermined center frequency.

5. The power splitter and combiner according to any one of claims 1 to 3, characterized in that: At least one second open stub connected to the first transmission line is provided.

6. The power splitter combiner according to claim 5, characterized in that: The length of the second open stub is shorter than the length of the first open stub.

7. The power splitter combiner according to claim 5, characterized in that: The electrical length of the first transmission line is shorter than a length corresponding to a quarter wavelength of a predetermined center frequency.

8. The power splitter combiner according to claim 1, wherein: The first transmission line and the second transmission line extend parallel to each other and are bent in the same direction.

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