Inductor circuit and wireless communication device

Abstract

The application discloses an inductor circuit and a wireless communication device. The inductor circuit comprises a receiver-side inductive circuit, a transmitter-side inductive circuit and an antenna-side inductive circuit, which are realized on a single chip. The receiver-side inductive circuit is arranged on a specific ring of a specific plane to form a ring shape. The transmitter-side inductive circuit and the antenna-side inductive circuit are arranged in the specific ring and surrounded by the specific ring of the specific plane. The circuit area of the transmitter-side inductive circuit in the specific ring and on the specific plane is greater than the circuit area of the receiver-side inductive circuit and the antenna-side inductive circuit. Better circuit balance and better circuit / signal matching can be provided, and more circuit area can be saved.

Description

Technical Field

[0001] This invention relates to a transformer structure, and more particularly to an inductor circuit and a wireless communication device. Background Technology

[0002] Generally speaking, a traditional wireless transceiver requires multiple circuit areas, such as different chips, to implement different coils of a traditional transformer circuit. This means that the implementation of the traditional transformer circuit requires more circuit area. Summary of the Invention

[0003] Therefore, one of the objectives of this invention is to disclose an inductor circuit and a wireless communication device having the inductor circuit, so as to solve the above-mentioned problems.

[0004] According to an embodiment of the present invention, an inductor circuit is disclosed. The inductor circuit includes a receiver-side inductor circuit, a transmitter-side inductor circuit, and an antenna-side inductor circuit. The receiver-side inductor circuit has a first terminal coupled to a first input interface of the receiver circuit and a second terminal coupled to a second input interface of the receiver circuit. The transmitter-side inductor circuit has a first terminal coupled to a first output interface of the transmitter circuit and a second terminal coupled to a second output interface of the transmitter circuit. The antenna-side inductor circuit has a first terminal coupled to a first signal interface of the antenna circuit and a second terminal coupled to a second signal interface of the antenna circuit. The receiver-side inductor circuit is disposed on a specific ring on a specific plane, forming a ring; the transmitter-side inductor circuit and the antenna-side inductor circuit are disposed within the specific ring and surrounded by the specific ring on the specific plane. The circuit area occupied by the transmitter-side inductor circuit within the specific ring and on the specific plane is greater than the circuit area occupied by the receiver-side inductor circuit and the antenna-side inductor circuit.

[0005] According to an embodiment of the present invention, a wireless communication device is also disclosed. The wireless communication device includes the inductor circuit, antenna circuit, receiving circuit, and transmitter circuit described above.

[0006] According to embodiments of the present invention, better circuit balance and better circuit / signal matching can be provided, and more circuit area can be saved. Attached Figure Description

[0007] Figure 1 This is a block diagram of a wireless communication device according to an embodiment of the present invention.

[0008] Figure 2 This is a schematic diagram illustrating an example of the physical circuit layout of the receiver-side inductive circuit LR according to an embodiment of the present invention.

[0009] Figure 3This is a schematic diagram illustrating an example of the physical circuit layout of an antenna-side inductive circuit LA according to an embodiment of the present invention.

[0010] Figure 4 This is a schematic diagram illustrating an example of the physical circuit layout of a transmitter-side inductive circuit LT according to an embodiment of the present invention.

[0011] Figure 5 According to an embodiment of the present invention Figure 1 A schematic diagram of a physical circuit layout example of the combined positions of inductor circuits LA, LR, and LT on the antenna side, receiver side, and transmitter side of the inductor circuit.

[0012] The reference numerals in the attached figures are explained as follows:

[0013] 100 Wireless communication devices

[0014] 105 Antenna Circuit

[0015] 110 Receiver Circuit

[0016] 115 Transmitter Circuit

[0017] 120 Inductor Circuit Detailed Implementation

[0018] This invention aims to disclose a technical solution for a wireless communication device and a corresponding transformer-inductor circuit. In this transformer-inductor circuit, most or all of the inductive elements are disposed on and / or within a ring on a specific plane, effectively saving circuit costs and reducing the circuit area occupied by multiple inductive elements. The disclosed technical solution can more effectively reduce the circuit area occupied by these inductive elements on a single die. Compared with the conventional method of implementing different inductive elements individually, the technical solution disclosed in this invention can effectively integrate a larger portion or all of the inductive elements into the same circuit region on the same plane, thereby saving even more circuit costs.

[0019] Figure 1This is a block diagram of a wireless communication device 100 according to an embodiment of the present invention. The wireless communication device 100 includes an antenna circuit 105, a receiver circuit 110, a transmitter circuit 115, and an inductor circuit 120 serving as a transformer circuit. For example, the wireless communication device 100 can be implemented using circuit elements such as a system-on-chip (SOC) die. The wireless communication device 100 supports, for example, at least one wireless communication protocol, such as one or more mobile communication protocols, Bluetooth communication protocols, and any version of the IEEE 802.11 communication protocol (i.e., wireless local area network protocol). For example, the wireless communication device 100 can be a Bluetooth transceiver or a Wi-Fi transceiver. Furthermore, the wireless communication device 100 can be, for example, a transceiver device operating in a signal receiving mode and a signal transmitting mode, respectively.

[0020] Transmitter circuit 115, for example in signal transmission mode, is configured to generate a set or pair of differential signals and output them to inductor circuit 120. Receiver circuit 110, in signal reception mode, is configured to receive another set or pair of differential signals.

[0021] The inductor circuit 120, used as a transformer, includes a first inductor circuit LR, a second inductor circuit LT, and a third inductor circuit LA. The inductor circuits LR, LT, and LA are respectively configured for the receiver side, transmitter side, and antenna side, and are hereinafter referred to as the receiver-side inductor circuit LR, the transmitter-side inductor circuit LT, and the antenna-side inductor circuit LA. The antenna-side inductor circuit LA is located on or on the primary side of the transformer 120, while the receiver-side inductor circuit LR and the transmitter-side inductor circuit LT are located on or on the secondary side of the transformer 120. Furthermore, the signal polarity is as follows: Figure 1 As shown in the image.

[0022] The antenna-side inductive circuit LA is an inductive inductor coil on the antenna side. Its first terminal LA_E1 is coupled to the first signal port P1 of the antenna circuit 105, and its second terminal LA_E2 is coupled to the second signal port P2 of the antenna circuit 105. The first signal port P1 and the second signal port P2 are, for example, interfaces for two differential signals and are used to transmit a pair of differential signals from the antenna circuit 105 to the transformer 120 in the signal reception mode, and to transmit another pair of differential signals from the transformer 120 to the antenna circuit 105 in the signal transmission mode. In the signal reception mode, this pair of differential signals is coupled through the antenna-side inductive circuit LA and the receiver-side inductive circuit LR via a transformer coupling operation, and is then received by the receiving circuit 110. In the signal transmission mode, different pairs of differential signals are coupled through another transformer coupling operation through the transmitter-side inductive circuit LT and the antenna-side inductive circuit LA, and are then received by the antenna circuit 105 to transmit them into the air.

[0023] Furthermore, in other embodiments, one of the first signal interface P and the second signal interface P2 may be associated with operations for sending and receiving a communication signal, while the other interface may be associated with a ground level of the antenna circuit 105. This is not a limitation of the invention.

[0024] The receiver-side inductive circuit LR is an inductive inductor coil on the receiver side. Its first terminal LR_E1 is coupled to the first input interface R1 of the receiver circuit 110, and its second terminal LR_E2 is coupled to the second input interface R2 of the receiver circuit 110. The first input interface R1 and the second input interface R2 are the differential signal input interfaces of the receiver circuit 110. In addition, the center / terminal LR_C of the coil of the receiver-side inductive circuit LR is coupled to the ground node P4 of the receiver circuit 110.

[0025] The transmitter-side inductive circuit LT is an inductive inductor coil on the transmitting side. Its first terminal LT_E1 is coupled to the first output interface S1 of the transmitter circuit 115, and its second terminal LT_E2 is coupled to the second output interface S2 of the transmitter circuit 115. The first output interface S1 and the second output interface S2 are two differential signal output interfaces of the transmitter circuit 115. In addition, the transmitter-side inductive circuit LT also includes a first intermediate terminal LT_E3 and a second intermediate terminal LT_E4. The first intermediate terminal LT_E3 is coupled to a third output interface S3 of the transmitter circuit 115, and the second intermediate terminal LT_E4 is coupled to a fourth output interface S4 of the transmitter circuit 115. The first output interface S1 and the second output interface S2 of the transmitter circuit 115 correspond to a first transmit power of the signal transmission mode, and the third output interface S3 and the fourth output interface S4 of the transmitter circuit 115 correspond to a second transmit power of the signal transmission mode, which is different from the first transmit power. In addition, the center / endpoint LT_C of the coil of the transmitter-side inductive circuit LT is coupled to the ground node P3 of the transmitter circuit 115.

[0026] The turns ratio (or number of turns) is expressed as follows: Figure 1 In this example, the antenna-side inductor LA has N1 turns, the receiver-side inductor LR has N2 turns, and the transmitter-side inductor LT has N3 or N4 turns at different points. For instance, the receiver-side inductor LR is configured to have N2 turns from the first endpoint LR_E1 to the second endpoint LR_E2, the antenna-side inductor LA is configured to have N1 turns from the first endpoint LA_E1 to the second endpoint LA_E2, the transmitter-side inductor LT has N3 turns from the first endpoint LT_E1 to the second endpoint LT_E2, and the transmitter-side inductor LT has N4 turns from the first intermediate endpoint LT_E3 to the second intermediate endpoint LT_E4. In one example (but not a limitation), the values ​​of N1, N2, N3, and N4 can be 2, 1, 6, and 4, respectively. Furthermore, the turns ratios of N1, N2, N3, and N4 may be the same or different in other embodiments. These embodiments are not intended to limit the invention.

[0027] To save more die area while simultaneously implementing the aforementioned inductor circuit design, the inductor circuits LA, LR, and LT can be arranged on a single circuit die to form the inductor circuit 120. (Reference) Figure 2 , Figure 3 and Figure 4 In conjunction with references Figure 5 . Figure 2This is a schematic diagram illustrating an example of the physical circuit layout of the receiver-side inductive circuit LR according to an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating an example of the physical circuit layout of an antenna-side inductive circuit LA according to an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating an example of the physical circuit layout of a transmitter inductive circuit LT according to an embodiment of the present invention. Figure 5 According to one embodiment of the present invention Figure 1 This is a schematic diagram illustrating an example of the physical circuit layout of the antenna-side, receiver-side, and transmitter-side inductor circuit 120. The combined positions of the antenna-side, receiver-side, and transmitter-side inductor circuits LA, LR, and LT of this inductor circuit 120 are arranged on the same plane, for example, on a specific plane.

[0028] exist Figure 2 As shown, in practice, if the number of turns N2 is configured to 1, the receiver-side inductive circuit LR is, for example (but not limited to), implemented and configured as a single-turn inductive coil without cross-connections. This single-turn inductive coil can be considered as an outer loop of the inductor circuit 120 and disposed on a specific loop of the specific plane to form as shown. Figure 2 The single coil is shown as a ring / circle. Its center endpoint / node LR_C is coupled to the ground node P4 of the receiving circuit 110, while the first endpoint LR_E1 and the second endpoint LR_E2 of the receiver-side inductive circuit LR are respectively coupled to the two input interfaces R1 and R2 of the receiving circuit 110. Furthermore, the center endpoint / node LR_C of the single coil can be coupled to other different circuits located at different angles / positions on this specific plane.

[0029] exist Figure 3 In this embodiment, the antenna-side inductive circuit LA is implemented and configured as two loops, namely, an inner loop (or inner coil on the antenna side) 301, an outer loop (or outer coil on the antenna side) 302, and a cross-connection portion 303. If the number of turns N1 is configured to be 2, each loop 301 and 302 is associated with a single inductive coil. Both the inner loop 301 and the outer loop 302 are configured and located inside or within the outer ring of the inductor circuit 120, i.e., surrounded by the receiver-side inductive circuit LR. The antenna-side inductive circuit LA is equivalently arranged in a spiral shape.

[0030] exist Figure 4In this example, the transmitter-side inductive circuit LT is implemented and arranged as three turns, namely, having an inner turn 401, a middle turn 402, an outer turn 403, and multiple cross-connections 404 (e.g., five cross-connections). If the number of turns N3 and the number of turns N4 are 6 and 4 respectively, then each turn is associated with two inductive coils (i.e., an inductive coil of the inner turn and an inductive coil of the outer turn). And as... Figure 4 As shown, the distance between two distinct adjacent turns is greater than the distance between two adjacent inductive coils belonging to the same turn. That is, each inner / middle / outer turn 401 to 403 of the transmitter-side inductive circuit LT includes two inductive coils, such that the total length from the first endpoint LT_E1 to the second endpoint LT_E2 of the transmitter-side inductive circuit LT is configured to have six inductive coils, while the total length from the first endpoint LA_E1 to the second endpoint LA_E2 of the antenna-side inductive circuit LA is configured to have two inductive coils. This achieves an implementation where the turns ratio N1:N3 of the transformer (i.e., inductor circuit 120) is 2:6. Similarly, the total length from the first intermediate endpoint LT_E3 of the transmitter-side inductive circuit LT to the second intermediate endpoint LT_E4 of the transmitter-side inductive circuit LT is configured to have four inductive coils, thus achieving a transformer turns ratio N1:N4 (i.e., inductor circuit 120) of 2:4. Similarly, the inner ring 401, the middle ring 402, and the outer ring 403 are all configured and located inside or within the outer ring of the inductor circuit 120, i.e., surrounded by the receiver-side inductive circuit LR. The transmitter-side inductive circuit LT is equivalently arranged in a spiral shape.

[0031] exist Figure 5 In this configuration, the inner ring 301 of the antenna-side inductive circuit LA is disposed between the inner ring 401 and the intermediate ring 402 of the transmitter-side inductive circuit LT, thereby separating the inner ring 401 and the intermediate ring 402 of the transmitter-side inductive circuit LT. Furthermore, the outer ring 302 of the antenna-side inductive circuit LA is disposed between the outer ring 403 and the intermediate ring 402 of the transmitter-side inductive circuit LT, thereby separating the outer ring 403 and the intermediate ring 402 of the transmitter-side inductive circuit LT. For implementation... Figure 5The circuit placement / arrangement on a single-chip circuit becomes very easy. The inner ring 401 of the transmitter-side inductor circuit LT is equivalently surrounded by the inner ring 301 of the antenna-side inductor circuit LA. The inner ring 301 of the antenna-side inductor circuit LA is equivalently surrounded by the inner ring 402 of the transmitter-side inductor circuit LT. The inner ring 402 of the transmitter-side inductor circuit LT is equivalently surrounded by the outer ring 302 of the transmitter-side inductor circuit LT. The outer ring 302 of the transmitter-side inductor circuit LT is equivalently surrounded by the outer ring 403 of the transmitter-side inductor circuit LT. The outer ring 403 of the transmitter-side inductor circuit LT is equivalently surrounded by the coil of the receiver-side inductor circuit LR. For example... Figure 5 As shown, the transmitter-side inductive circuit LT and the antenna-side inductive circuit LA can be considered as being disposed on an inner annular region of the specific plane, which is surrounded by the outer ring of the inductor circuit 120. Furthermore, the circuit area occupied by the transmitter-side inductive circuit LT on this specific plane is larger than the circuit area occupied by the receiver-side inductive circuit LR and the antenna-side inductive circuit LA.

[0032] In addition, Figure 5 In this embodiment, the antenna-side inductive circuit LA includes two antenna-side loops or coils, and the transmitter-side inductive circuit LT includes three transmitter-side rings / circles, each of which includes two inductive coils. Each antenna-side coil is positioned between two transmitter-side rings / circles. In other embodiments, the antenna-side inductive circuit LA may include N antenna coils / circles, and the transmitter-side inductive circuit LT may include (N+1) transmitter-side rings / circles, each of which includes M coils. The value of N can be equal to or greater than 3, thereby enabling different designs with different turns ratios N1:N2, N1:N3, and N1:N4. The value of M can be different from 2. These variations of embodiments also fall within the scope of this invention.

[0033] In other embodiments, the different inner / middle / outer loops 401 to 403 of the transmitter-side inductive circuit LT may each have different numbers of coils in response to different designs of ratios N1:N2, N1:N3, and N1:N4. Furthermore, it should be noted that the shape of the aforementioned at least one loop / coil can be octagonal, polygonal, or circular, etc.; its shape is not a limitation of the invention.

[0034] In addition, Figure 5In this circuit, the first endpoints LR_E1 and LR_E2 of the receiver-side inductive circuit LR, and the endpoints LT_E1, LT_E2, LT_E3, and LT_E4 of the transmitter-side inductive circuit LT, can all be configured to be located on a first side of the single-chip die of the inductor circuit 120, that is... Figure 5 The first endpoint LA_E1 and the second endpoint LA_E2 of the antenna-side inductor circuit LA are located on a second side of the inductor circuit 120, such as the top side, which is different from the bottom side. In other embodiments, all endpoints of the three inductor circuits LA, LT, and LR can be located on the same side of the single-chip die, or they can be located on different sides of the single-chip die, such as the left or right side of the single-chip die.

[0035] By integrating an integrated transformer, a balun circuit, and multiple inductive components, the technical solution disclosed in this invention can provide better circuit balance and better circuit / signal matching, while saving more circuit area. Furthermore, Figure 1 The traces or coils of multiple inductive circuits on the primary and secondary sides of the transformer 120 can be implemented on the same metal layer, and can be achieved by using a top layer such as a thick metal layer (but not limited to) to reduce potential losses and obtain a better quality factor. Furthermore, Figure 1 and Figure 5 The transformer 120 shown can be adapted and installed in a variety of different applications. For example, it can be used in the structure of a multi-power selectable power amplifier in the transmitter circuit 115, a Doherty power amplifier, a Gm-boosted CG low noise amplifier in the receiver circuit 110, and a source inductive-degenerated low noise amplifier, etc.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inductor circuit, characterized in that, include: A receiver-side inductive circuit has a first terminal and a second terminal. The first terminal of the receiver-side inductive circuit is coupled to a first input interface of a receiver circuit, and the second terminal of the receiver-side inductive circuit is coupled to a second input interface of the receiver circuit. A transmitter-side inductive circuit has a first terminal and a second terminal. The first terminal of the transmitter-side inductive circuit is coupled to a first output interface of a transmitter circuit, and the second terminal of the transmitter-side inductive circuit is coupled to a second output interface of the transmitter circuit. as well as An antenna-side inductive circuit has a first terminal and a second terminal. The first terminal of the antenna-side inductive circuit is coupled to a first signal interface of an antenna circuit, and the second terminal of the antenna-side inductive circuit is coupled to a second signal interface of the antenna circuit. The receiver-side inductive circuit is arranged on a ring on a specific plane to form a ring; the transmitter-side inductive circuit and the antenna-side inductive circuit are arranged inside the ring and surrounded by the ring on the specific plane; and the circuit area occupied by the transmitter-side inductive circuit on the inner side of the ring and on the specific plane is larger than the circuit area occupied by the receiver-side inductive circuit and the antenna-side inductive circuit, respectively; the specific plane is the plane in which the receiver-side inductive circuit, the transmitter-side inductive circuit, and the antenna-side inductive circuit coexist. The antenna-side inductive circuit includes an inner antenna coil and an outer antenna coil; the transmitter-side inductive circuit includes an inner ring, a middle ring, and an outer ring; the inner antenna coil is disposed between the inner ring and the middle ring of the transmitter-side inductive circuit; the outer antenna coil is disposed between the middle ring and the outer ring of the transmitter-side inductive circuit; and the outer ring of the transmitter-side inductive circuit is disposed between the outer antenna coil and the receiver-side inductive circuit, the receiver-side inductive circuit being disposed on the ring of the specific plane.

2. The inductor circuit as described in claim 1, characterized in that, The transmitter-side inductive circuit further includes a first intermediate terminal and a second intermediate terminal, the first intermediate terminal being coupled to a third output interface of the transmitter circuit, and the second intermediate terminal being coupled to a fourth output interface of the transmitter circuit; and the first output interface and the second output interface of the transmitter circuit correspond to a first transmission power, while the third output interface and the fourth output interface of the transmitter circuit correspond to a second transmission power different from the first transmission power.

3. The inductor circuit as described in claim 1, characterized in that, The receiver-side inductive circuit, the transmitter-side inductive circuit, and the antenna-side inductive circuit are all housed within a single chip.

4. The inductor circuit as described in claim 1, characterized in that, Each of the inner ring, the middle ring, and the outer ring of the transmitter-side inductive circuit has an inner coil and an outer coil, forming a spiral shape of the transmitter-side inductive circuit.

5. The inductor circuit as described in claim 1, characterized in that, The antenna-side inductive circuit includes N antenna-side coils, and the transmitter-side inductive circuit includes (N+1) turns; and each antenna-side coil is disposed between two turns of the transmitter-side inductive circuit, where N is equal to or greater than 3.

6. The inductor circuit as described in claim 1, characterized in that, The first and second endpoints of the receiver-side inductive circuit and the first and second endpoints of the transmitter-side inductive circuit are located on the first side of the inductor circuit, while the first and second endpoints of the antenna-side inductive circuit are located on the second side of the inductor circuit, which is different from the first side of the inductor circuit.

7. A wireless communication device, characterized in that, include: An antenna circuit; A receiver circuit; A transmitter circuit; as well as An inductor circuit includes: A receiver-side inductive circuit has a first terminal and a second terminal. The first terminal of the receiver-side inductive circuit is coupled to a first input interface of the receiver circuit, and the second terminal of the receiver-side inductive circuit is coupled to a second input interface of the receiver circuit. A transmitter-side inductive circuit has a first terminal and a second terminal. The first terminal of the transmitter-side inductive circuit is coupled to a first output interface of the transmitter circuit, and the second terminal of the transmitter-side inductive circuit is coupled to a second output interface of the transmitter circuit. An antenna-side inductive circuit has a first terminal and a second terminal. The first terminal of the antenna-side inductive circuit is coupled to a first signal interface of the antenna circuit, and the second terminal of the antenna-side inductive circuit is coupled to a second signal interface of the antenna circuit. The receiver-side inductive circuit is arranged on a ring on a specific plane to form a ring; the transmitter-side inductive circuit and the antenna-side inductive circuit are arranged inside the ring and surrounded by the ring on the specific plane; and the circuit area occupied by the transmitter-side inductive circuit on the inner side of the ring and on the specific plane is larger than the circuit area occupied by the receiver-side inductive circuit and the antenna-side inductive circuit, respectively; the specific plane is the plane in which the receiver-side inductive circuit, the transmitter-side inductive circuit, and the antenna-side inductive circuit coexist. The antenna-side inductive circuit includes an inner antenna coil and an outer antenna coil; the transmitter-side inductive circuit includes an inner ring, a middle ring, and an outer ring; the inner antenna coil is disposed between the inner ring and the middle ring of the transmitter-side inductive circuit; the outer antenna coil is disposed between the middle ring and the outer ring of the transmitter-side inductive circuit; and the outer ring of the transmitter-side inductive circuit is disposed between the outer antenna coil and the receiver-side inductive circuit, the receiver-side inductive circuit being disposed on the ring of the specific plane.

8. The wireless communication device as claimed in claim 7, characterized in that, The transmitter-side inductive circuit further includes a first intermediate terminal and a second intermediate terminal, the first intermediate terminal being coupled to a third output interface of the transmitter circuit, and the second intermediate terminal being coupled to a fourth output interface of the transmitter circuit; and the first output interface and the second output interface of the transmitter circuit correspond to a first transmission power, while the third output interface and the fourth output interface of the transmitter circuit correspond to a second transmission power different from the first transmission power.

9. The wireless communication device as claimed in claim 7, characterized in that, The receiver-side inductive circuit, the transmitter-side inductive circuit, and the antenna-side inductive circuit are all housed within a single chip.

10. The wireless communication device as claimed in claim 7, characterized in that, Each of the inner ring, the middle ring, and the outer ring of the transmitter-side inductive circuit has an inner coil and an outer coil, forming a spiral shape of the transmitter-side inductive circuit.

11. The wireless communication device as claimed in claim 7, characterized in that, The antenna-side inductive circuit includes N antenna-side coils, and the transmitter-side inductive circuit includes (N+1) turns; and each antenna-side coil is disposed between two turns of the transmitter-side inductive circuit, where N is equal to or greater than 3.

12. The wireless communication device as claimed in claim 7, characterized in that, The first and second endpoints of the receiver-side inductive circuit and the first and second endpoints of the transmitter-side inductive circuit are located on the first side of the inductor circuit, while the first and second endpoints of the antenna-side inductive circuit are located on the second side of the inductor circuit, which is different from the first side of the inductor circuit.

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