Phase shifter

Abstract

This phase shifter comprises: a high-frequency transmission path I connected between a first output terminal (1b) of an input-side selector switch (1) and a first input terminal (2b) of an output-side selector switch (2); and a low-frequency transmission path II connected between a second output terminal (1c) of the input-side selector switch (1) and a second input terminal (2c) of the output-side selector switch (2).　The high-frequency transmission path I has a high-pass filter (10) and an all-band pass circuit (11) connected in series, and the low-frequency transmission path II has a composite right / left-handed transmission line (20) and an all-band pass circuit (21) connected in series.

Description

phase shifter

[0001] The present disclosure relates to a phase shifter that switches between a high-pass transmission path and a low-pass transmission path for an input signal.

[0002] A phase shifter having a structure in which a high-pass filter and a composite right-left handed line (CRLH line) are switched by a switch is disclosed in Patent Document 1. The phase shifter disclosed in Patent Document 1 includes a high-pass filter connected between a first output terminal of an input-side changeover switch and a first input terminal of an output-side changeover switch, and a composite right-left handed line connected between a second output terminal of the input-side changeover switch and a second input terminal of the output-side changeover switch.

[0003] WO2019 / 244244 publication

[0004] When the phase shifter disclosed in Patent Document 1 is implemented in a monolithic microwave integrated circuit (MMIC), self-resonance occurs due to parasitic components of the high-pass filter and the inductor elements used in the composite right-handed / left-handed transmission line, which limits the bandwidth that can be achieved, and further bandwidth expansion is desired.

[0005] The present disclosure has been made in consideration of the above-mentioned points, and has an object to provide a phase shifter in which the phase shift amount error is reduced so as to operate over a wide frequency band from low to high frequency bands.

[0006] A phase shifter according to the present disclosure includes a high-band transmission path connected between a first output terminal of an input-side changeover switch and a first input terminal of an output-side changeover switch, and a low-band transmission path connected between a second output terminal of the input-side changeover switch and a second input terminal of the output-side changeover switch. The high-band transmission path has a high-pass filter and an all-band-pass circuit connected in series, and the low-band transmission path has a composite right-handed / left-handed transmission line and an all-band-pass circuit connected in series.

[0007] According to the present disclosure, phase shift amount errors can be reduced over a wide frequency band from low to high.

[0008] FIG. 1 is a circuit diagram showing a phase shifter according to a first embodiment. FIG. 2 is a circuit diagram showing an example of an all-pass filter that is an all-band pass circuit in the phase shifter according to the first embodiment. FIG. 3 is a circuit diagram showing another example of an all-pass filter that is an all-band pass circuit in the phase shifter according to the first embodiment. FIG. 4 is a circuit diagram showing an example of a delay circuit that is an all-band pass circuit in the phase shifter according to the first embodiment. FIG. 5 is a diagram showing a passing phase difference with respect to frequency in the phase shifter according to the first embodiment. FIG. 6 is a circuit diagram showing a phase shifter according to a second embodiment. FIG. 7 is a diagram showing a frequency and a passing phase difference between each path in the phase shifter according to the second embodiment. FIG. 8 is a diagram showing a passing phase difference with respect to frequency when the inductance of the high-pass inductor of the high-pass filter and the inductance of the second low-pass inductor of the composite right-left handed line are reduced in the phase shifter according to the third embodiment. FIG. 9 is a diagram showing a comparison result between a case where an ideal lumped element is used and a case where a spiral inductor is used as the second low-pass inductor of the composite right-left handed line in the phase shifter according to the third embodiment. 10 is a diagram showing a comparison result between a case where an ideal lumped element is used as the second low-pass inductor of the composite right-handed and left-handed line and a case where a spiral inductor is used as the second low-pass inductor of the composite right-handed and left-handed line when the inductance of the high-pass inductor of the high-pass filter and the inductance of the second low-pass inductor of the composite right-handed and left-handed line are reduced in the phase shifter according to embodiment 3. FIG. 11 is a diagram showing a passing phase difference with respect to a frequency obtained by subtracting the passing phase of the composite right-handed and left-handed line alone from the passing phase of the high-pass filter alone when the inductance of the high-pass inductor of the high-pass filter and the inductance of the second low-pass inductor of the composite right-handed and left-handed line are reduced in the phase shifter according to embodiment 3. FIG. 12 is a diagram showing a passing amplitude when the inductance of the second low-pass inductor of the composite right-handed and left-handed line is reduced in the phase shifter according to embodiment 3.

[0009] Embodiment 1. A phase shifter according to embodiment 1 will be described with reference to Figures 1 to 5. The phase shifter according to embodiment 1 includes a high-frequency transmission path I and a low-frequency transmission path II connected between an input-side changeover switch 1 and an output-side changeover switch 2. The high-frequency transmission path I and the low-frequency transmission path II are switched between an input terminal 3 and an output terminal 4 by the input-side changeover switch 1 and the output-side changeover switch 2.

[0010] The input signal consisting of a high-frequency signal input from the input terminal 3 to the input end 1a of the input-side changeover switch 1 is advanced in phase by the high-frequency transmission path I and is output from the output end 2a of the output-side changeover switch 2 to the output terminal 4 as an output signal consisting of a phase-delayed high-frequency signal. The input signal input to the input end 1a of the input-side changeover switch 1 is delayed in phase by the low-frequency transmission path II and is output from the output end 2a of the output-side changeover switch 2 to the output terminal 4 as an output signal consisting of a phase-advancing high-frequency signal.

[0011] The phase shifter according to the first embodiment obtains a phase shift amount from a passing phase difference that occurs in an output signal made up of a high-frequency signal that has passed through it by switching between a high-frequency transmission path I and a low-frequency transmission path II using an input-side changeover switch 1 and an output-side changeover switch 2. The phase shifter according to the first embodiment is mounted on a monolithic microwave integrated circuit (MMIC, hereinafter referred to as MMIC). In the following description, to avoid complicating the description, "connection" means "electrical connection" unless otherwise specified.

[0012] The input-side changeover switch 1 has an input terminal 1a, a first output terminal 1b, and a second output terminal 1c. The input terminal 1a of the input-side changeover switch 1 is connected to an input terminal 3 to which an input signal having a wide frequency band from low to high is input.

[0013] The output-side changeover switch 2 has an output terminal 2a, a first input terminal 2b, and a second input terminal 2c. The output terminal 2a of the output-side changeover switch 2 is connected to an output terminal 4. The input-side changeover switch 1 and the output-side changeover switch 2 are each an SPDT switch.

[0014] The high-pass transmission path I is connected between the first output terminal 1b of the input-side changeover switch 1 and the first input terminal 2b of the output-side changeover switch 2. The high-pass transmission path I has a high-pass filter 10 and an all-band-pass circuit 11 connected in series. The high-pass filter 10 has an input terminal 10a and an output terminal 10b. The input terminal 10a of the high-pass filter 10 is connected to the first output terminal 1b of the input-side changeover switch 1.

[0015] The high-pass filter 10 has a first high-pass capacitor 101, a second high-pass capacitor 102, and a high-pass inductor 103. One electrode of the first high-pass capacitor 101 is connected to a first output terminal 1b of the input-side changeover switch 1 via an input terminal 10a. One electrode of the second high-pass capacitor 102 is connected to the other electrode of the first high-pass capacitor 101, and the other electrode is connected to an input terminal 11a of an all-band-pass circuit 11 in the high-pass transmission path I via an output terminal 10b.

[0016] The high-frequency inductor 103 is connected between a connection point P1, at which the other electrode of the first high-frequency capacitor 101 and one electrode of the second high-frequency capacitor 102 are connected, and the ground node. The first high-frequency capacitor 101 and the second high-frequency capacitor 102 are each a MIM (Metal Insulator Metal) capacitor mounted on an MMIC. The high-frequency inductor 103 is a spiral inductor mounted on the MMIC.

[0017] The capacitance C of the first high-frequency capacitor 101 and the second high-frequency capacitor 102 Ｈ is shown in the following equation (1).

[0018] In the above equation (1), ω ０ is the angular frequency of the operating center frequency of the high-pass filter 10 (hereinafter simply referred to as the operating center frequency), Φ ０１ is the operating center frequency ω ０ the phase shift (pass phase difference) of the high-pass filter 10 in Z ０ is the impedance of the power supply circuit system. The operating center frequency ω of the high-pass filter 10 ０ In the first embodiment, the operating center frequency ω of the phase shifter ０ It is also.

[0019] As can be seen from the above equation (1), the capacitances C of the first high-frequency capacitor 101 and the second high-frequency capacitor 102 are Ｈ is the operating center frequency ω ０ and phase shift amount (passing phase difference) Φ ０１The capacitances C of the first high-frequency capacitor 101 and the second high-frequency capacitor 102 depend on Ｈ is the operating center frequency ω ０ The normalized susceptance satisfies the reciprocal of the tangent of half the phase shift.

[0020] The inductance L of the high-frequency inductor 103 Ｈ is shown in the following equation (2).

[0021] As can be seen from the above equation (2), the inductance L of the high-frequency inductor 103 Ｈ is the operating center frequency ω ０ and phase shift amount (passing phase difference) Φ ０１ The inductance L of the high-frequency inductor 103 depends on Ｈ is the operating center frequency ω ０ The normalized reactance of the phase shifter satisfies the reciprocal of the sine of the phase shift amount.

[0022] The all-band pass circuit 11 in the high-band transmission path I has an input terminal 11a and an output terminal 11b. The input terminal 11a of the all-band pass circuit 11 is connected to the output terminal 10b of the high-pass filter 10. The output terminal 11b of the all-band pass circuit 11 is connected to the first input terminal 2b of the output-side changeover switch 2. The all-band pass circuit 11 passes the entire frequency band of the input signal input to the first output terminal 1b of the input-side changeover switch 1 via the input terminal 1a and the input terminal 3.

[0023] The all-pass circuit 11 is an all-pass filter (APF) that includes a first capacitor 111, a first inductor 112, a second inductor 113, and a second capacitor 114. One electrode of the first capacitor 111 is connected to the output terminal 10b of the high-pass filter 10, and the other electrode is connected to the first input terminal 2b of the output-side changeover switch 2 via the output terminal 11b.

[0024] One end of the first inductor 112 is connected to one electrode of the first capacitor 111. One end of the second inductor 113 is connected to the other electrode of the first capacitor 111. The second capacitor 114 is connected between a connection point P2 where the other end of the first inductor 112 and the other end of the second inductor 113 are connected and the ground node.

[0025] The first capacitor 111 and the second capacitor 114 are each an MIM capacitor mounted on an MMIC. The first inductor 112 and the second inductor 113 are each a spiral inductor mounted on an MMIC.

[0026] The capacitance C of the first capacitor 111 １ （１） is expressed by the following equation (3), and the capacitance C of the second capacitor 114 is ２ （１） is expressed by the following equation (4), and the inductance L of each of the first inductor 112 and the second inductor 113 is calculated. １ （１） is shown in the following equation (5).

[0027]

[0028] In the above formulas (3), (4), and (5), p is shown in the following formula (6).

[0029] In the above equations (3), (4), and (5), ω ０ is also the operating center frequency of the all-pass filter 11. In the above equation (6), Φ ０２ is the operating center frequency ω ０ is the passing phase difference of the all-pass filter 11 in

[0030] The all-pass circuit 11 may be the all-pass filter shown in Fig. 3. The all-pass filter shown in Fig. 3 has a fifth inductor 121, a fifth capacitor 122, a sixth capacitor 123, and a sixth inductor 124. One end of the fifth inductor 121 is connected to the output end 10b of the high-pass filter 10, and the other end is connected to the first input end 2b of the output-side changeover switch 2 via the output end 11b.

[0031] One electrode of the fifth capacitor 122 is connected to one end of the fifth inductor 121. One electrode of the sixth capacitor 123 is connected to the other end of the fifth inductor 121. The sixth inductor 124 is connected between the connection point where the other electrode of the fifth capacitor 122 and the other electrode of the sixth capacitor 123 are connected and the ground node.

[0032] Moreover, the all-pass circuit 11 may be a delay circuit formed of an all-pass filter as shown in Fig. 4. That is, the delay circuit shown in Fig. 4 has a ninth capacitor 131, a ninth inductor 132, a tenth inductor 133, an eleventh inductor 134, a tenth capacitor 135, and a twelfth inductor 136.

[0033] One electrode of the ninth capacitor 131 is connected to the output terminal 10b of the high-pass filter 10. One end of the ninth inductor 132 is connected to the other electrode of the ninth capacitor 131, and the other end is connected to the first input terminal 2b of the output-side changeover switch 2 via the output terminal 11b.

[0034] One end of the tenth inductor 133 is connected to one electrode of the ninth capacitor 131. One end of the eleventh inductor 134 is connected to the other end of the ninth inductor 132. One electrode of the tenth capacitor 135 is connected to the connection point where the other end of the tenth inductor 133 and the other end of the eleventh inductor 134 are connected. The twelfth inductor 136 is connected between the other electrode of the tenth capacitor 135 and the ground node.

[0035] Low-band transmission path II is connected between second output terminal 1c of input-side changeover switch 1 and second input terminal 2c of output-side changeover switch 2. Low-band transmission path II has series-connected composite right-left handed transmission line 20 and all-band pass circuit 21. Composite right-left handed transmission line 20 has input terminal 20a and output terminal 20b. Input terminal 20a of composite right-left handed transmission line 20 is connected to second output terminal 1c of input-side changeover switch 1.

[0036] Composite right-left handed transmission line 20 has first low-frequency inductor 201, first low-frequency capacitor 202, second low-frequency capacitor 203, and second low-frequency inductor 204. One end of first low-frequency inductor 201 is connected to second output end 1c of input-side changeover switch 1 via input end 20a.

[0037] One electrode of the first low-frequency capacitor 202 is connected to the other end of the first low-frequency inductor 201, and the other electrode is connected to the input end 21a of the all-pass circuit 21 in the low-frequency transmission path II via the output end 20b. The second low-frequency capacitor 203 is connected between the other electrode of the first low-frequency capacitor 202 and the ground node. The second low-frequency inductor 204 is connected between the other electrode of the first low-frequency capacitor 202 and the ground node.

[0038] The resonant frequency of the series combination in which the first low-frequency inductor 201 and the first low-frequency capacitor 202 are connected in series is the same as the resonant frequency of the parallel combination in which the second low-frequency capacitor 203 and the second low-frequency inductor 204 are connected in parallel.

[0039] The first low-frequency inductor 201 and the second low-frequency inductor 204 are spiral inductors mounted on an MMIC. The first low-frequency capacitor 202 and the second low-frequency capacitor 203 are MIM capacitors mounted on an MMIC.

[0040] The inductance L of the first low-frequency inductor 201 Ｒ is shown in the following equation (7).

[0041] The capacitance C of the first low-frequency capacitor 202Ｌ is shown in the following equation (8).

[0042] The inductance L of the second low-frequency inductor 204 Ｌ is shown in the following equation (9).

[0043] The capacitance C of the second low-frequency capacitor 203 Ｒ is shown in the following equation (10).

[0044] In the above equation (9), β is shown in the following equation (11).

[0045] In the above equations (7) to (10), ω ０ is also the operating center frequency of composite right-left handed transmission line 20. In the above equation (11), ωmin is the angular frequency of the lower limit operating frequency in composite right-left handed transmission line 20, and ωmax is the angular frequency of the upper limit operating frequency in composite right-left handed transmission line 20.

[0046] All-band pass circuit 21 in low-band transmission path II has input terminal 21a and output terminal 21b. Input terminal 21a of all-band pass circuit 21 is connected to output terminal 20b of composite right-left handed transmission line 20. Output terminal 21b of all-band pass circuit 21 is connected to second input terminal 2c of output-side changeover switch 2. All-band pass circuit 21 passes the entire band of frequencies of an input signal input to second output terminal 1c of input-side changeover switch 1 via input terminal 1a and input terminal 3.

[0047] All-pass circuit 21 is an all-pass filter (APF) that includes a third capacitor 211, a third inductor 212, a fourth inductor 213, and a fourth capacitor 214. One electrode of third capacitor 211 is connected to output end 20b of composite right-handed / left-handed transmission line 20, and the other electrode is connected to second input end 2c of output-side changeover switch 2 via output end 21b.

[0048] One end of the third inductor 212 is connected to one electrode of the third capacitor 211. One end of the fourth inductor 213 is connected to the other electrode of the third capacitor 211. The fourth capacitor 214 is connected between a connection point P3 where the other end of the third inductor 212 and the other end of the fourth inductor 213 are connected and the ground node.

[0049] The third capacitor 211 and the fourth capacitor 214 are MIM capacitors mounted on the MMIC, and the third inductor 212 and the fourth inductor 213 are spiral inductors mounted on the MMIC.

[0050] The capacitance C of the third capacitor 211 １ （２） is expressed by the following equation (12), and the capacitance C ２ （２） is expressed by the following equation (13), and the inductance L of each of the third inductor 212 and the fourth inductor 213 is calculated. １ （２） is shown in the following equation (14).

[0051]

[0052] In the above equations (12) to (14), ω ０ is also the operating center frequency of the all-pass filter 21.

[0053] As shown in the above formulas (3), (4), and (5) and the above formulas (12), (13), and (14), the all-pass filter 21 in the low-pass transmission path II has the same circuit configuration as the all-pass filter 11 in the high-pass transmission path I, and the circuit configurations are dual to each other, and although the values ​​of each element are different, the phase characteristics are the same. ０２ is the operating center frequency ω ０ is the passing phase difference of the all-pass filter 21 in

[0054] All-pass circuit 21 may be the all-pass filter shown in Fig. 3. The all-pass filter shown in Fig. 3 has seventh inductor 221, seventh capacitor 222, eighth capacitor 223, and eighth inductor 224. One end of seventh inductor 221 is connected to output end 20b of composite right-handed / left-handed transmission line 20, and the other end is connected to second input end 2c of output-side changeover switch 2 via output end 21b.

[0055] One electrode of the seventh capacitor 222 is connected to one end of the seventh inductor 221. One electrode of the eighth capacitor 223 is connected to the other end of the seventh inductor 221. The eighth inductor 224 is connected between the connection point where the other electrode of the seventh capacitor 222 and the other electrode of the eighth capacitor 223 are connected and the ground node.

[0056] The all-pass filter in the low-pass transmission path II shown in FIG. 3 has the same circuit configuration as the all-pass filter in the high-pass transmission path I shown in FIG. 3, and the circuit configurations are dual to each other. Although the values ​​of each element are different, the phase characteristics are the same.

[0057] Moreover, the all-pass circuit 21 may be a delay circuit formed of an all-pass filter as shown in Fig. 4. That is, the delay circuit shown in Fig. 4 has an eleventh capacitor 231, a thirteenth inductor 232, a fourteenth inductor 233, a fifteenth inductor 234, a twelfth capacitor 235, and a sixteenth inductor 236.

[0058] One electrode of eleventh capacitor 231 is connected to output end 20b of composite right-left handed transmission line 20. One end of thirteenth inductor 232 is connected to the other electrode of eleventh capacitor 231, and the other end is connected to second input end 2c of output-side changeover switch 2 via output end 21b.

[0059] One end of the fourteenth inductor 233 is connected to one electrode of the eleventh capacitor 231. One end of the fifteenth inductor 234 is connected to the other end of the thirteenth inductor 232. One electrode of the twelfth capacitor 235 is connected to a connection point where the other end of the fourteenth inductor 233 and the other end of the fifteenth inductor 234 are connected. The sixteenth inductor 236 is connected between the other electrode of the twelfth capacitor 235 and the ground node.

[0060] The delay circuit in the low-pass transmission path II shown in FIG. 4 has the same circuit configuration as the delay circuit in the high-pass transmission path I shown in FIG. 4, and is a dual circuit configuration, with the values ​​of each element being different but the phase characteristics being the same.

[0061] Next, the passing phase difference at frequency in the phase shifter according to the first embodiment will be described with reference to Fig. 5. In Fig. 5, the horizontal axis represents frequency, the vertical axis represents passing phase difference, and curve A shown by a solid line ０ is a characteristic curve showing the passing phase difference in the phase shifter according to the first embodiment, that is, the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II. For comparison, the curve A shown by the dashed line in FIG. １ and curve A shown by the dashed line ２ Shows.

[0062] Characteristic curve A １ 1 is a phase shifter (hereinafter referred to as Comparative Example 1) in which all-band pass circuit 11 is not provided in high-band transmission path I, and output end 10 b of high-pass filter 10 is directly connected to first input end 2 b of output-side changeover switch 2, and all-band pass circuit 21 is not provided in low-band transmission path II, and output end 20 b of composite right-left handed transmission line 20 is directly connected to second input end 2 c of output-side changeover switch 2. The phase difference in Comparative Example 1 indicates the phase difference between high-pass filter 10 and composite right-left handed transmission line 20.

[0063] Characteristic curve A ２1 , high-pass filter 10 is not provided in high-band transmission path I, and input end 11 a of all-band pass circuit 11 is directly connected to first output end 1 b of input-side changeover switch 1, and composite right / left handed transmission line 20 is not provided in low-band transmission path II, and input end 21 a of all-band pass circuit 21 is directly connected to second output end 1 c of input-side changeover switch 1 (hereinafter referred to as comparative example 2). The passing phase difference of comparative example 2 indicates the passing phase difference between all-band pass circuit 11 in high-band transmission path I and all-band pass circuit 21 in low-band transmission path II.

[0064] Characteristic curve A showing the passing phase difference in Comparative Example 1 １ is the operating center frequency FC (the operating center frequency ω of the high-pass filter 10 and the composite right-handed / left-handed transmission line 20) ０ ) and is an asymmetric characteristic with a larger phase difference on the low frequency side. ２ is a peak-shaped characteristic centered on the operating center frequency FC.

[0065] In contrast, characteristic curve A, which shows the passing phase difference in the phase shifter according to the first embodiment, ０ 5, the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II is smoothed and widened. That is, as indicated by the arrow X in FIG. 5, the passing phase difference in the phase shifter according to the first embodiment is suppressed up to a low frequency range compared to the passing phase differences in the first and second comparative examples.

[0066] As a result, in the phase shifter according to the first embodiment, the design center frequency can be set on the high frequency side, and the inductance of the inductor constituting the phase shifter can be reduced. When the inductance of the inductor is reduced, the self-resonant frequency shifts to a higher frequency range, resulting in a phase shifter that operates over a wide band. In short, since the self-resonant frequency of the phase shifter according to the first embodiment shifts to a higher frequency range, the phase shift amount error can be reduced over a wide band from low frequency bands to high frequency bands.

[0067] In the phase shifter according to the first embodiment, the reason why the band can be widened is that the passing phase difference between high-pass filter 10 and composite right-handed / left-handed transmission line 20 (characteristic curve A １ ) and the passing phase difference between the all-band pass circuit 11 in the high-frequency transmission path I and the all-band pass circuit 21 in the low-frequency transmission path II (characteristic curve A ２ This is roughly the result of adding up the

[0068] Therefore, the passing phase difference in the phase shifter is Φ １ Operating center frequency ω ０ The phase shift (pass phase difference) Φ of the high-pass filter 10 ０１ and the operating center frequency ω ０ The pass phase difference Φ of the all-pass circuit 11 in ０２ The setting of is the passing phase difference (phase shift amount) Φ ０１ and the passing phase difference Φ ０２ The sum of these is the passing phase difference Φ １ Make it so that it becomes like this.

[0069] The phase shifter according to the first embodiment includes a high-band transmission path I connected between a first output terminal 1 b of an input-side changeover switch 1 and a first input terminal 2 b of an output-side changeover switch 2, and a low-band transmission path II connected between a second output terminal 1 c of an input-side changeover switch 1 and a second input terminal 2 c of an output-side changeover switch 2. The high-band transmission path I has a high-pass filter 10 and an all-pass circuit 11 connected in series, and the low-band transmission path II has a composite right-handed / left-handed transmission line 20 and an all-pass circuit 21 connected in series. Therefore, the passing phase difference between the high-band transmission path I and the low-band transmission path II is smoothed, the phase shift amount error can be reduced, and the bandwidth is widened.

[0070] Second Embodiment A phase shifter according to a second embodiment will be described with reference to Figures 6 and 7. In the phase shifter according to the first embodiment, the all-pass circuit 11 in the high-band transmission path I is one all-pass filter, and the all-pass circuit 21 in the low-band transmission path II is one all-pass filter.

[0071] In contrast, the phase shifter according to the second embodiment differs from the phase shifter according to the first embodiment in that the all-pass circuit 11 in the high-band transmission path I is made up of all-pass filters 11A and 11B connected in cascade in two stages, and the all-pass circuit 21 in the low-band transmission path II is made up of all-pass filters 21A and 21B connected in cascade in two stages. In other respects, the phase shifter according to the second embodiment is the same as the phase shifter according to the first embodiment.

[0072] Therefore, the following description will focus on the differences from the phase shifter according to embodiment 1. In Figures 6 and 7, the same reference numerals as those in Figures 1 to 5 indicate the same or corresponding parts.

[0073] The all-pass circuit 11 in the high-band transmission path I is composed of two-stage all-pass filters 11A and 11B. The all-pass filter 11A has an input terminal 11Aa and an output terminal 11Ab, and includes a first capacitor 111A, a first inductor 112A, a second inductor 113A, and a second capacitor 114A. The circuit configuration of the all-pass filter 11A is the same as the circuit configuration of the all-pass filter 11 in the phase shifter according to the first embodiment.

[0074] The capacitance C of the first capacitor 111A Ａ１ （１） is the same as the above equation (3) and is shown in the following equation (15).

[0075] The capacitance C of the second capacitor 114A Ａ２ （１） is the same as the above equation (4) and is shown in the following equation (16).

[0076] The inductance L of each of the first inductor 112A and the second inductor 113A Ａ１ （１） is the same as the above equation (5) and is shown in the following equation (17).

[0077] In the above formulas (15) to (17), p １ is the same as the above equation (6) and is shown in the following equation (18).

[0078] In the above equations (15) to (17), ω １ is the operating center frequency of all-pass filter 11A, and the lower limit operating frequency ωmin and the operating center frequency ω in composite right-handed / left-handed transmission line 20 are ０ In the above equation (18), Φ Ａ０２ is the frequency ω １ The phase difference of the all-pass filter 11A at the operating center frequency ω ０ are the operating center frequencies of high-pass filter 10 and composite right-left handed transmission line 20.

[0079] The all-pass filter 11B has an input terminal 11Ba and an output terminal 11Bb, and includes a first capacitor 111B, a first inductor 112B, a second inductor 113B, and a second capacitor 114B. The circuit configuration of the all-pass filter 11B is the same as the circuit configuration of the all-pass filter 11 in the phase shifter according to the first embodiment.

[0080] The capacitance C of the first capacitor 111B Ｂ１ （１） is the same as the above equation (3) and is shown in the following equation (19).

[0081] The capacitance C of the second capacitor 114B Ｂ２ （１） is the same as the above equation (4) and is shown in the following equation (20).

[0082] The inductance L of each of the first inductor 112B and the second inductor 113B Ｂ１ （１） is the same as the above equation (5) and is shown in the following equation (21).

[0083] In the above equations (19) to (21), p ２ is the same as the above equation (6) and is shown in the following equation (22).

[0084] In the above equations (19) to (21), ω ２ is the operating center frequency of the all-pass filter 11B, and the operating center frequency ω ０and the upper limit operation frequency ωmax in composite right-left handed transmission line 20. In the above equation (22), Φ Ｂ０２ is the frequency ω ２ is the passing phase difference of the all-pass filter 11B.

[0085] Passing phase difference Φ Ａ０２ is the passing phase difference Φ Ｂ０２ or the same as the passing phase difference Φ Ａ０２ passes through phase difference Φ Ｂ０２ The operating center frequency ω ０ is the operating center frequency of high-pass filter 10 and the operating center frequency of composite right-left handed transmission line 20. Frequency ω ２ and the operating center frequency ω ０ The interval is the frequency ω １ and the operating center frequency ω ０ The interval is the same as

[0086] The all-pass circuit 21 in the low-band transmission path II is composed of two-stage all-pass filters 21A and 21B. The all-pass filter 21A has an input terminal 21Aa and an output terminal 21Ab, and also has a third capacitor 211A, a third inductor 212A, a fourth inductor 213A, and a fourth capacitor 214A. The circuit configuration of the all-pass filter 21A is the same as the circuit configuration of the all-pass filter 21 in the phase shifter according to the first embodiment.

[0087] The capacitance C of the third capacitor 211A Ａ１ （２） is the same as the above equation (12) and is shown in the following equation (23).

[0088] The capacitance C of the fourth capacitor 214A Ａ２ （２） is the same as the above equation (13) and is shown in the following equation (24).

[0089] The inductance L of each of the third inductor 212A and the fourth inductor 213A Ａ１ （２） is the same as the above equation (14) and is shown in the following equation (25).

[0090] In the above equations (23) to (25), ω １ is the operating center frequency of all-pass filter 21A, and the lower limit operating frequency ωmin and the operating center frequency ω in composite right-handed / left-handed transmission line 20 are ０ Φ Ａ０２ is the frequency ω １ The phase difference of the all-pass filter 21A at the operating center frequency ω ０ are the operating center frequencies of high-pass filter 10 and composite right-left handed transmission line 20.

[0091] As shown in the above equations (15), (16), and (17) and the above equations (23), (24), and (25), the all-pass filter 21A in the low-band transmission path II has the same circuit configuration as the all-pass filter 11A in the high-band transmission path I, and the circuit configurations are dual to each other, with the values ​​of each element being different but the phase characteristics being the same.

[0092] The all-pass filter 21B has an input terminal 21Ba and an output terminal 21Bb, and includes a third capacitor 211B, a third inductor 212B, a fourth inductor 213B, and a fourth capacitor 214B. The circuit configuration of the all-pass filter 21B is the same as the circuit configuration of the all-pass filter 21 in the phase shifter according to the first embodiment.

[0093] The capacitance C of the third capacitor 211B Ｂ１ （２） is the same as the above equation (12) and is shown in the following equation (26).

[0094] The capacitance C of the fourth capacitor 214B Ｂ２ （２） is the same as the above equation (13) and is shown in the following equation (27).

[0095] The inductance L of each of the third inductor 212B and the fourth inductor 213B Ｂ１ （２） is the same as the above equation (14) and is shown in the following equation (28).

[0096] In the above equations (26) to (28), ω ２ is the operating center frequency of the all-pass filter 21B, and the operating center frequency ω ０ and the upper limit operation frequency ωmax in composite right-left handed transmission line 20. Ｂ０２ is the frequency ω ２ is the passing phase difference of the all-pass filter 21B.

[0097] As shown in the above equations (19), (20), and (21) and the above equations (26), (27), and (28), the all-pass filter 21B in the low-band transmission path II has the same circuit configuration as the all-pass filter 11B in the high-band transmission path I, and the circuit configurations are dual to each other, with the values ​​of each element being different but the phase characteristics being the same.

[0098] In the low-pass transmission path II, the transmission phase difference Φ Ａ０２ is the passing phase difference Φ Ｂ０２ or the same as the passing phase difference Φ Ａ０２ passes through phase difference Φ Ｂ０２ The value is slightly smaller than the frequency ω ２ and the operating center frequency ω ０ The interval is the frequency ω １ and the operating center frequency ω ０ The interval is the same as

[0099] Next, the passing phase difference in frequency in the phase shifter according to the second embodiment will be described with reference to Fig. 7. In Fig. 7, the horizontal axis represents frequency, the vertical axis represents passing phase difference, and curve A shown by a solid line ００ is a characteristic curve showing the passing phase difference in the phase shifter according to the second embodiment, that is, the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II. For comparison, the curve A shown by the dashed line in FIG. １ and curve A shown by the dashed line Ａ２ and the curve A shown by the dashed double-dashed line Ｂ２ Shows.

[0100] Characteristic curve A １6 is a phase shifter (hereinafter referred to as Comparative Example 1) in which all-band pass circuit 11 is not provided in high-band transmission path I, and output end 10 b of high-pass filter 10 is directly connected to first input end 2 b of output-side changeover switch 2, and all-band pass circuit 21 is not provided in low-band transmission path II, and output end 20 b of composite right-left handed transmission line 20 is directly connected to second input end 2 c of output-side changeover switch 2. The phase difference in Comparative Example 1 indicates the phase difference between high-pass filter 10 and composite right-left handed transmission line 20.

[0101] Characteristic curve A Ａ２ 6, the high-pass filter 10 and the second-stage all-pass filter 11B of the all-pass circuit 11 are not provided in the high-pass transmission path I, the input terminal 11Aa of the first-stage all-pass filter 11A of the all-pass circuit 11 is directly connected to the first output terminal 1b of the input-side changeover switch 1, and the output terminal 11Ab of the first-stage all-pass filter 11A is directly connected to the first input terminal 2b of the output-side changeover switch 2. 1. The figure shows the pass phase difference in a phase shifter (hereinafter referred to as Comparative Example 2A) in which composite right-handed / left-handed transmission line 20 and second-stage all-pass filter 21B of all-band-pass circuit 21 are not provided, input terminal 21Aa of first-stage all-pass filter 21A of all-band-pass circuit 21 is directly connected to second output terminal 1c of input-side changeover switch 1, and output terminal 21Ab of first-stage all-pass filter 21A is directly connected to second input terminal 2c of output-side changeover switch 2. The pass phase difference in Comparative Example 2A indicates the pass phase difference between first-stage all-pass filter 11A of all-band-pass circuit 11 in high-band transmission path I and first-stage all-pass filter 21A of all-band-pass circuit 21 in low-band transmission path II.

[0102] Characteristic curve A Ｂ２In the phase shifter shown in FIG. 6, the high-pass filter 10 and the first-stage all-pass filter 11A of the all-pass circuit 11 are not provided in the high-pass transmission path I, the input terminal 11Ba of the second-stage all-pass filter 11B of the all-pass circuit 11 is directly connected to the first output terminal 1b of the input-side changeover switch 1, and the output terminal 11Bb of the second-stage all-pass filter 11B is directly connected to the first input terminal 2b of the output-side changeover switch 2. 1B. The figure shows the pass phase difference when a phase shifter (hereinafter referred to as Comparative Example 2B) is used in which composite right-handed / left-handed transmission line 20 and first-stage all-pass filter 21B of all-band-pass circuit 21 are not provided, input terminal 21Ba of second-stage all-pass filter 21B of all-band-pass circuit 21 is directly connected to second output terminal 1c of input-side selector switch 1, and output terminal 21Bb of second-stage all-pass filter 21B is directly connected to second input terminal 2c of output-side selector switch 2. The pass phase difference of Comparative Example 2B indicates the pass phase difference between second-stage all-pass filter 11B of all-band-pass circuit 11 in high-band transmission path I and second-stage all-pass filter 21B of all-band-pass circuit 21 in low-band transmission path II.

[0103] Characteristic curve A showing the passing phase difference in Comparative Example 1 １ is the operating center frequency FC (the operating center frequency ω of the high-pass filter 10 and the composite right-handed / left-handed transmission line 20) ０ ) and is an asymmetric characteristic with a larger phase difference on the low frequency side. Ａ２ is the operating center frequency ω of the all-pass filter 11A and the all-pass filter 21A. １ The characteristic curve A shows the transmission phase difference in Comparative Example 2B. Ｂ２ is the operating center frequency ω of the all-pass filter 11B and the all-pass filter 21B. ２ It has the characteristic of being mountain-shaped with the center at the center.

[0104] In contrast, characteristic curve A, which shows the passing phase difference in the phase shifter according to the second embodiment, ００In the phase shifter according to the second embodiment, the pass phase difference between the high-pass filter 10 and the composite right-handed / left-handed transmission line 20 is smoothed and the band is widened. １ ) and the pass phase difference (characteristic curve A) between the first-stage all-pass filter 11A of the all-pass circuit 11 in the high-pass transmission path I and the first-stage all-pass filter 21A of the all-pass circuit 21 in the low-pass transmission path II. Ａ２ ) and the pass phase difference (characteristic curve A) between the second-stage all-pass filter 11B of the all-pass circuit 11 in the high-pass transmission path I and the second-stage all-pass filter 21B of the all-pass circuit 21 in the low-pass transmission path II. Ｂ２ This is roughly the result of adding up the

[0105] Moreover, the frequency ω １ The pass phase difference Φ of the all-pass filter 11A in Ａ０２ is the frequency ω ２ The pass phase difference Φ of the all-pass filter 11B in Ｂ０２ By setting the value smaller, the smoothing can be extended to the lower frequency side. The phase shifter according to the second embodiment has the same effect as the phase shifter according to the first embodiment, and can further widen the bandwidth.

[0106] In the phase shifter according to the second embodiment, the two-stage all-pass filters 11A and 11B constituting the all-pass circuit 11 in the high-band transmission path I and the two-stage all-pass filters 21A and 21B constituting the all-pass circuit 21 in the low-band transmission path II may each be a delay circuit formed of the all-pass filter shown in FIG. 3 or the all-pass filter shown in FIG. 4, as described in the first embodiment.

[0107] In the phase shifter according to the second embodiment, the all-band pass circuit 11 in the high-band transmission path I is configured with two-stage all-pass filters 11A and 11B, and the all-band pass circuit 21 in the low-band transmission path II is configured with two-stage all-pass filters 21A and 21B. Alternatively, the all-band pass circuit 11 in the high-band transmission path I may be configured with three or more stages of all-pass filters 11A, 11B, ..., and the all-band pass circuit 21 in the low-band transmission path II may be configured with three or more stages of all-pass filters 21A, 21B, ....

[0108] In this case, the number of all-pass filter stages in the high-band transmission path I and the number of all-pass filter stages in the low-band transmission path II are the same, and the all-pass filter in the high-band transmission path I and the all-pass filter in the low-band transmission path II of corresponding stages have a dual circuit configuration, and although the values ​​of each element are different, the phase characteristics are the same.

[0109] Furthermore, the operating center frequencies of the multi-stage all-pass filters in the high-band transmission path I and the multi-stage all-pass filters in the low-band transmission path II are set to smaller values ​​as they are positioned closer to the input-side changeover switch 1. The operating center frequencies of the multi-stage all-pass filters in the high-band transmission path I and the multi-stage all-pass filters in the low-band transmission path II are set to frequencies that are shifted by a fixed interval.

[0110] Third Embodiment A phase shifter according to a third embodiment will be described with reference to Fig. 8 to Fig. 12. The phase shifter according to the third embodiment has an inductance L Ｈ is changed from the value shown in the above equation (2) in the phase shifter according to the first embodiment to the value shown in the following equation (29), and the inductance L of second low-frequency inductor 204 of composite right-left handed transmission line 20 in low-frequency transmission path II is Ｌ The phase shifter of the present embodiment differs from the phase shifter of the first embodiment in that the value shown in the above equation (9) in the phase shifter of the first embodiment is changed to the value shown in the following equation (30), but in other respects it is the same as the phase shifter of the first embodiment.

[0111] Therefore, the following description will focus on the differences from the phase shifter according to embodiment 1. Note that the circuit configuration of the phase shifter according to embodiment 3 is the same as the circuit configuration shown in Figure 1, and therefore Figure 1 will be used in the following description.

[0112]

[0113]

[0114] In the above equation (29), γ is a positive constant less than or equal to 1, and in the above equations (29) and (30), ζ is a positive variable less than or equal to 1.

[0115] The inductance L of the high-pass inductor 103 of the high-pass filter 10 of the high-pass transmission path I shown in the above equation (29) Ｈ is the operating center frequency ω of the high-pass filter 10 shown in the above equation (2). ０ The inductance L of the high-frequency inductor 103 has a relationship in which the normalized reactance of Ｈ This is a lower value obtained by multiplying the slope of (1-γζ).

[0116] The inductance L of the second low-frequency inductor 204 of the composite right-left handed transmission line 20 in the low-frequency transmission path II shown in the above equation (30) is Ｌ is the inductance L of the second low-frequency inductor 204 when the resonance frequency of the series combination of the first low-frequency inductor 201 and the first low-frequency capacitor 202 connected in series shown in the above equation (9) is the same as the resonance frequency of the parallel combination of the second low-frequency capacitor 203 and the second low-frequency inductor 204 connected in parallel. Ｌ This is a lower value obtained by applying a slope of (1-ζ) to the value.

[0117] Now, the operating center frequency FC (the operating center frequency ω of the high-pass filter 10 and the composite right-handed / left-handed transmission line 20) is ０ ) at 20 GHz, and the operating center frequency ω ０ The phase shift (pass phase difference) of the high-pass filter 10 is 22.5, and the impedance of the power supply circuit system is Z ０ Various verifications were carried out for the cases where ζ was varied, with β set to 50, β set to 2, and γ set to 0.3. The verification results are shown in Figs.

[0118] 8 shows the verification results of the passing phase difference with respect to frequency when ζ is varied in the circuit configuration shown in FIG. 1. FIG. 8 shows the results of the verification results of the passing phase difference with respect to frequency when ζ is varied in the circuit configuration shown in FIG. Ｈ and the inductance L of the second low-frequency inductor 204 of the composite right-left handed transmission line 20 in the low-frequency transmission path II. Ｌ 10 shows the passing phase difference versus frequency when ζ is varied and reduced to 0, 0.3, 0.5, and 0.7.

[0119] In FIG. 8, the horizontal axis represents frequency, the vertical axis represents the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II, and curve A １１ The characteristic curve showing the passing phase difference in the phase shifter when ζ=0, curve A １２ Curve A is a characteristic curve showing the passing phase difference in the phase shifter when ζ=0.3. １３ The characteristic curve showing the passing phase difference in the phase shifter when ζ=0.5, curve A １４ 10 shows a characteristic curve indicating a passing phase difference in the phase shifter when ζ=0.7.

[0120] As can be seen from FIG. 8, when ζ is up to 0.5, that is, when the inductance L Ｈ and the inductance L of the second low-frequency inductor 204 Ｌ Even if the frequency is reduced to 50%, the valley-like characteristic centered on the operating center frequency FC is generally maintained.

[0121] Next, in the circuit configuration shown in Fig. 1, the results of verification of the case where an ideal lumped element and a spiral inductor are used as the second low-frequency inductor 204 are shown in Fig. 9 and Fig. 10. Fig. 9 shows the results of verification of the case where an ideal lumped element and a spiral inductor are used as the second low-frequency inductor 204 in the circuit configuration shown in Fig. 1. Ｈ 9.41 nH, and the inductance L of the second low-frequency inductor 204 Ｌ 30.35 nH and ζ=0, the comparison results are shown for the case where an ideal lumped element is used as the second low-frequency inductor 204 and the case where a spiral inductor is used.

[0122] In FIG. 9, the horizontal axis represents frequency, the vertical axis represents the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II, and curve B １１ is the characteristic curve when an ideal lumped constant element is used as the second low-frequency inductor 204, and curve B is the characteristic curve when an ideal lumped constant element is used as the second low-frequency inductor 204. １２ 2 shows the characteristic curve when a spiral inductor is used as the second low-frequency inductor 204.

[0123] FIG. 10 shows the inductance L of the high-frequency inductor 103 in the circuit configuration shown in FIG. Ｈ 7.44 nH, and the inductance L of the second low-frequency inductor 204 Ｌ 9.11 nH, ζ=0.7 (70% reduction), the comparison results are shown for the case where an ideal lumped element is used as the second low-frequency inductor 204 and the case where a spiral inductor is used.

[0124] In FIG. 10, the horizontal axis represents frequency, the vertical axis represents the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II, and curve B ２１ is the characteristic curve when an ideal lumped constant element is used as the second low-frequency inductor 204, and curve B is the characteristic curve when an ideal lumped constant element is used as the second low-frequency inductor 204. ２２ 2 shows the characteristic curve when a spiral inductor is used as the second low-frequency inductor 204.

[0125] As is clear from FIG. 10, the characteristic curve B when a spiral inductor is used as the second low-frequency inductor 204 ２２ Regarding the characteristic curve B when using ideal lumped constant elements, ２１ Similarly, the primary resonance frequency is increased to around 3.1 GHz, and the inductance L Ｈ and the inductance L of the second low-frequency inductor 204 Ｌ By reducing the .DELTA..times ...

[0126] FIG. 11 shows the verification results of the passing phase difference obtained by subtracting the passing phase of composite right-left handed transmission line 20 alone in low-band transmission path II from the passing phase of high-pass filter 10 alone in high-band transmission path I, versus frequency when ζ is varied.

[0127] FIG. 11 shows the inductance L of the high-pass inductor 103 of the high-pass filter 10 of the high-pass transmission path I. Ｈ and the inductance L of the second low-frequency inductor 204 of the composite right-left handed transmission line 20 in the low-frequency transmission path II. Ｌ 10 shows the passing phase difference versus frequency when ζ is varied and reduced to 0, 0.3, 0.5, 0.7, and 0.9.

[0128] In FIG. 11, the horizontal axis represents frequency, the vertical axis represents the passing phase difference between the high-frequency transmission path I and the low-frequency transmission path II, and curve A ２１ The characteristic curve showing the passing phase difference in the phase shifter when ζ=0, curve A ２２ Curve A is a characteristic curve showing the passing phase difference in the phase shifter when ζ=0.3. ２３ The characteristic curve showing the passing phase difference in the phase shifter when ζ=0.5, curve A ２４ Curve A is a characteristic curve showing the passing phase difference in the phase shifter when ζ=0.7. ２５ 10 shows a characteristic curve indicating a passing phase difference in the phase shifter when ζ=0.9.

[0129] As can be seen from FIG. 11, when ζ is up to 0.5, that is, when the inductance L Ｈ and the inductance L of the second low-frequency inductor 204 Ｌ Even if the frequency is reduced to 50%, the valley-like characteristic centered on the operating center frequency FC is generally maintained.

[0130] FIG. 12 shows the inductance L of the second low-frequency inductor 204 of the composite right-left handed transmission line 20 in the low-frequency transmission path II. Ｌ 12 shows the frequency versus the passing amplitude when ζ is varied to 0, 0.3, 0.5, 0.7, and 0.9. In FIG. 12, the horizontal axis represents frequency, the vertical axis represents reflected amplitude, and curve C １ The characteristic curve showing the passing amplitude when ζ = 0, curve C ２ The characteristic curve showing the passing amplitude when ζ = 0.3, curve C ３ The characteristic curve showing the passing amplitude when ζ=0.5, curve C ４ The characteristic curve showing the passing amplitude when ζ=0.7, curve C ５ 1 shows a characteristic curve showing the passing amplitude when ζ=0.9.

[0131] As can be seen from FIG. 12, when ζ is up to 0.5, that is, when the inductance L Ｌ The phase shifter according to the third embodiment has the same effect as the phase shifter according to the first embodiment, and in particular, the inductance L of the high-frequency inductor 103 is reduced. Ｈ and the inductance L of the second low-frequency inductor 204 Ｌ By reducing the value of , even when a spiral inductor is used as the second low-frequency inductor 204, it is possible to achieve a broadband similar to that achieved when an ideal lumped element is used.

[0132] In the phase shifter according to the second embodiment, as explained in the third embodiment, the inductance L Ｈ is set to the value shown in the above equation (29), and the inductance L of the second low-frequency inductor 204 of the composite right-left handed transmission line 20 in the low-frequency transmission path II is set to Ｌ may be set to the value shown in the above equation (30).

[0133] It should be noted that the embodiments may be freely combined, any of the components of the embodiments may be modified, or any of the components of the embodiments may be omitted.

[0134] The phase shifter according to the present disclosure is particularly suitable for use in phased array antennas and multi-beam antennas.

[0135] I high-frequency transmission path, II low-frequency transmission path, 1 input-side changeover switch, 1a input terminal, 1b first output terminal, 1c second output terminal, 2 output-side changeover switch, 2a output terminal, 2b first input terminal, 2c second input terminal, 10 high-pass filter, 101 first high-frequency capacitor, 102 second high-frequency capacitor, 103 high-frequency inductor, 11, 11A, 11B all-band pass circuit (all-pass filter, delay circuit), 111, 111A, 111B first capacitor, 112, 112A, 112B first inductor, 113, 113A, 113B second inductor, 114, 114A, 114B second capacitor, 121 fifth inductor, 122 fifth capacitor, 123 sixth capacitor, 124 sixth inductor, 211, 211A, 211B a third capacitor, 212, 212A, 212B; a third inductor; and a fourth inductor, 213, 213A, 213B; a fourth capacitor, 214, 214A, 214B.

Claims

1. A phase shifter comprising: an input-side selector switch having an input terminal into which an input signal is input, a first output terminal and a second output terminal; an output-side selector switch having an output terminal into which an output signal is output, a first input terminal and a second input terminal; a high-frequency transmission path connected between the first output terminal of the input-side selector switch and the first input terminal of the output-side selector switch; and a low-frequency transmission path connected between the second output terminal of the input-side selector switch and the second input terminal of the output-side selector switch, The aforementioned high-frequency transmission path has a high-frequency filter and a full-band pass circuit connected in series. The aforementioned low-frequency transmission path has a series-connected right-handed / left-handed composite line and a full-band pass-through circuit. The right-hand / left-hand composite line in the low-frequency transmission path comprises a first low-frequency inductor, one end of which is connected to the second output terminal of the input-side selector switch; a first low-frequency capacitor, one electrode of which is connected to the other end of the first low-frequency inductor and the other electrode of which is connected to the full-band pass circuit in the low-frequency transmission path; a second low-frequency inductor, connected between the other electrode of the first low-frequency capacitor and a ground node; and a second low-frequency capacitor, connected between the other electrode of the first low-frequency capacitor and a ground node. In the right-handed / left-handed composite transmission line in the low-frequency transmission path, the resonant frequency of the series configuration in which the first low-frequency inductor and the first low-frequency capacitor are connected in series is the same as the resonant frequency of the parallel configuration in which the second low-frequency inductor and the second low-frequency capacitor are connected in parallel. The inductance of the second low-frequency inductor is lower than the inductance of the second low-frequency inductor when the resonant frequency of the series configuration and the resonant frequency of the parallel configuration are the same. Phase shifter.

2. The full-band pass circuit in the aforementioned high-frequency transmission path is a full-band pass filter. The full-band pass circuit in the aforementioned low-frequency transmission path is a full-band pass filter. The phase shifter according to claim 1.

3. The operating center frequency of the full-pass filter in the aforementioned high-frequency transmission path is the same as the operating center frequency of the high-pass filter in the aforementioned high-frequency transmission path. The phase shifter according to claim 2.

4. The full-band pass circuit in the aforementioned high-frequency transmission path is composed of multiple stages of full-band pass filters. The full-band pass circuit in the aforementioned low-frequency transmission path is composed of multiple full-band pass filters. The phase shifter according to claim 1.

5. The operating center frequencies of each of the multiple full-pass filters in the aforementioned high-frequency transmission path are set to frequencies that are shifted at regular intervals. The phase shifter according to claim 4.

6. The full-band pass circuit in the aforementioned high-frequency transmission path is composed of a two-stage full-band pass filter. The full-band pass circuit in the aforementioned low-frequency transmission path is composed of a two-stage full-band pass filter. The phase shifter according to claim 1.

7. The center frequencies of the two full-pass filters in the aforementioned high-frequency transmission path are set to frequencies that are equally spaced apart on either side of the operating center frequency of the high-pass filter in the aforementioned high-frequency transmission path. The center frequencies of the two full-pass filters in the low-frequency transmission path are set to frequencies that are equally spaced apart from the operating center frequency of the high-pass filter in the high-frequency transmission path. The phase shifter according to claim 6.

8. The pass-through filter in the high-frequency transmission path comprises a first capacitor with one electrode connected to the high-frequency filter and the other electrode connected to the first input terminal of the output-side selector switch, a first inductor with one end connected to one electrode of the first capacitor, a second inductor with one end connected to the other electrode of the first capacitor, and a second capacitor connected between the connection point where the other end of the first inductor and the other end of the second inductor are connected and the ground node. The full-pass filter in the low-frequency transmission path comprises a third capacitor with one electrode connected to the right-handed / left-handed composite line and the other electrode connected to the second input terminal of the output-side selector switch; a third inductor with one end connected to one electrode of the third capacitor; a fourth inductor with one end connected to the other electrode of the third capacitor; and a fourth capacitor connected between the connection point where the other end of the third inductor and the other end of the fourth inductor are connected and the ground node. A phase shifter according to any one of claims 2 to 7.

9. The pass-through filter in the high-frequency transmission path includes a fifth inductor having one end connected to the high-frequency filter and the other end connected to the first input terminal of the output-side selector switch, a fifth capacitor with one electrode connected to one end of the fifth inductor, a sixth capacitor with one electrode connected to the other end of the fifth inductor, and a sixth inductor connected between the connection point where the other electrode of the fifth capacitor and the other electrode of the sixth capacitor are connected and a ground node. The full-pass filter in the low-frequency transmission path includes a seventh inductor, one end of which is connected to the right-hand / left-hand combined transmission line and the other end of which is connected to the second input terminal of the output-side selector switch; a seventh capacitor, one electrode of which is connected to one end of the seventh inductor; an eighth capacitor, one electrode of which is connected to the other end of the seventh inductor; and an eighth inductor connected between the connection point where the other electrode of the seventh capacitor and the other electrode of the eighth capacitor are connected and the ground node. A phase shifter according to any one of claims 2 to 7.

10. The full-band pass circuit in the aforementioned high-frequency transmission path is composed of a delay circuit. The full-band pass circuit in the aforementioned low-frequency transmission path is composed of a delay circuit. The phase shifter according to claim 1.

11. The delay circuit in the high-frequency transmission path includes a ninth capacitor with one electrode connected to the high-frequency filter, a ninth inductor with one end connected to the other electrode of the ninth capacitor and the other end connected to the first input terminal of the output-side selector switch, a tenth inductor connected to one electrode of the ninth capacitor, an eleventh inductor with one end connected to the other end of the ninth inductor, a tenth capacitor with one electrode connected to the connection point where the other end of the tenth inductor and the other end of the eleventh inductor are connected, and a twelfth inductor connected between the other electrode of the tenth capacitor and the ground node. The delay circuit in the low-frequency transmission path includes an 11th capacitor with one electrode connected to the right-hand / left-hand combined transmission line, a 13th inductor with one end connected to the other electrode of the 11th capacitor and the other end connected to the second input terminal of the output-side selector switch, a 14th inductor connected to one electrode of the 11th capacitor, a 15th inductor with one end connected to the other end of the 13th inductor, a 12th capacitor with one electrode connected to the connection point where the other end of the 14th inductor and the other end of the 15th inductor are connected, and a 16th inductor connected between the other electrode of the 12th capacitor and the ground node. The phase shifter according to claim 10.

12. A phase shifter according to any one of claims 1 to 7, 10, or 11, wherein the high-pass filter in the high-pass transmission path comprises a first high-pass capacitor with one electrode connected to the first output terminal of the input-side selector switch, a second high-pass capacitor with one electrode connected to the other electrode of the first high-pass capacitor and the other electrode connected to the full-band pass circuit in the high-pass transmission path, and a high-pass inductor connected between the connection point where the other electrode of the first high-pass capacitor and one electrode of the second high-pass capacitor are connected and a ground node.

13. In the high-pass filter, the capacitances of the first high-pass capacitor and the second high-pass capacitor are such that the normalized susceptance at the operating center frequency is the reciprocal of the tangent of half the phase shift amount. In the aforementioned high-pass filter, the inductance of the high-pass inductor is such that the normalized reactance at the operating center frequency satisfies the reciprocal of the sine of the phase shift amount. The phase shifter according to claim 12.

14. The phase shifter according to claim 12, wherein in the high-pass filter, the inductance of the high-pass inductor is lower than the inductance of the high-pass inductor whose normalized reactance at the operating center frequency is the reciprocal of the sine of the phase shift amount.

15. The phase shifter comprises an input-side selector switch having an input terminal into which an input signal is input, a first output terminal and a second output terminal, an output-side selector switch having an output terminal to which an output signal is output, a first input terminal and a second input terminal, a high-frequency transmission path connected between the first output terminal of the input-side selector switch and the first input terminal of the output-side selector switch, and a low-frequency transmission path connected between the second output terminal of the input-side selector switch and the second input terminal of the output-side selector switch, The high-frequency transmission path has a high-frequency filter, and the low-frequency transmission path has a right-handed / left-handed composite transmission line. The high-pass filter in the high-pass transmission path includes a first high-pass capacitor and a second high-pass capacitor connected in series between the first output terminal of the input-side selector switch and the first input terminal of the output-side selector switch, and a high-pass inductor connected between the connection point where the first high-pass capacitor and the second high-pass capacitor are connected and the ground node. The low-frequency transmission path, a right-handed / left-handed composite line, has a series configuration consisting of a first low-frequency inductor and a first low-frequency capacitor connected in series between the first output terminal of the input-side selector switch and the first input terminal of the output-side selector switch, and a parallel configuration consisting of a second low-frequency inductor and a second low-frequency capacitor connected in parallel between the output terminal of the series configuration on the output-side selector switch side and the ground node. The inductance of the second low-frequency inductor is lower than the inductance of the second low-frequency inductor when the resonant frequency of the series configuration and the resonant frequency of the parallel configuration are the same. Phase shifter.

16. The phase shifter according to claim 18, wherein the inductance of the high-frequency inductor of the high-frequency filter in the high-frequency transmission path is lower than the inductance of the high-frequency inductor that satisfies the normalized reactance of the operating center frequency of the high-frequency filter to the reciprocal of the sine of the phase shift amount.