KR102211745B1 - Front end module - Google Patents

Abstract

A front end module according to an embodiment of the present invention includes: a first antenna terminal to which a first antenna is connected; A second antenna terminal to which a second antenna is connected; A plurality of first-side terminals provided on a first side and a plurality of second-side terminals provided on a second side corresponding to the other side of the first side, and each of the plurality of first-side terminals includes the first A switch connected to different antenna terminals of the antenna terminal and the second antenna terminal; A first filter connected to the first antenna terminal and having a pass band of a first frequency band; A second filter connected to the first antenna terminal and having a pass band of a second frequency band; A third filter connected to one of the plurality of second side terminals and having a pass band of a third frequency band; And a fourth filter connected to the other one of the plurality of second terminals and having a pass band of a fourth frequency band. Including, the third filter and the fourth filter may be connected to different antenna terminals of the first antenna terminal and the second antenna terminal.

Description

Front end module {FRONT END MODULE}

The present invention relates to a front end module.

The fifth generation (5G) communication is expected to efficiently connect more devices with more large-capacity data and faster data transmission speed compared to the existing LTE (Long Term Evolution) communication.

5G communication is developing in the direction of using the frequency band of 24250MHz ~ 52600MHz corresponding to the millimeter wave (mmWave) band and the frequency band of 450MHz ~ 6000MHz corresponding to the sub-6GHz band.

Each of the n77 band (3300MHz~4200MHz), n78 band (3300MHz~3800MHz) and n79 band (4400MH~5000MHz) was defined as one of the operating bands of sub-6GHz, and the n77 band (3300MHz~4200MHz), n78 band (3300MHz~3800MHz) and n79 band (4400MH~5000MHz) will be used as the main band according to the advantage of having a wide bandwidth.

An object of the present invention is to provide a front end module capable of providing various platforms.

A front end module according to an embodiment of the present invention includes: a first antenna terminal to which a first antenna is connected; A second antenna terminal to which a second antenna is connected; A plurality of first-side terminals provided on a first side and a plurality of second-side terminals provided on a second side corresponding to the other side of the first side, and each of the plurality of first-side terminals includes the first A switch connected to different antenna terminals of the antenna terminal and the second antenna terminal; A first filter connected to the first antenna terminal and having a pass band of a first frequency band; A second filter connected to the first antenna terminal and having a pass band of a second frequency band; A third filter connected to one of the plurality of second side terminals and having a pass band of a third frequency band; And a fourth filter connected to the other one of the plurality of second terminals and having a pass band of a fourth frequency band. Including, the third filter and the fourth filter may be connected to different antenna terminals of the first antenna terminal and the second antenna terminal.

According to an embodiment of the present invention, by reducing the number of antennas employed in mobile devices, it is possible to improve antenna isolation characteristics.

Also, the front end module according to an embodiment of the present invention may be applied to mobile devices having various types of platforms.

Furthermore, the front-end module according to an embodiment of the present invention simultaneously supports an n77 band (3.3GHz to 4.2GHz), a WiFi 5GHz band (5.15GHz to 5.95GHz), and a WiFi 2.4GHz band (2.4GHz to 2.4835GHz). In addition, it can support the n77 band (3.3GHz~4.2GHz), Wi-Fi 5GHz band (5.15GHz~5.95GHz), and LTE MB/HB band (1.7GHz~2.0GHz/2.3GHz~2.7GHz) at the same time. .

1 is a block diagram of a mobile device equipped with a front end module according to an embodiment of the present invention.
2 and 3 are block diagrams of a front end module according to an embodiment of the present invention.
4A is a block diagram of a front end module according to a first switching operation of a switch according to an embodiment of the present invention, and FIG. 4B is a front end module according to a first switching operation of a switch according to an embodiment of the present invention. Represents the frequency response.
5A is a block diagram of a front end module according to a second switching operation of a switch according to an embodiment of the present invention, and FIG. 5B is a front end module according to a second switching operation of a switch according to an embodiment of the present invention. Represents the frequency response.
6A is a schematic circuit diagram of a switch according to an embodiment of the present invention, FIG. 6B is an equivalent circuit diagram when the switch of FIG. 6A is turned on, and FIG. 6C is a circuit diagram when the switch of FIG. 6A is turned off.
7 is a block diagram of a front end module according to another embodiment of the present invention.
8 and 9 are block diagrams of a front end module according to another embodiment of the present invention.
10 is a block diagram illustrating an example of an amplifying unit connected to a filter according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention to be described later refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. In the drawings, like reference numerals refer to the same or similar functions over several aspects.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those of ordinary skill in the art to easily implement the present invention.

1 is a block diagram of a mobile device equipped with a front end module according to an embodiment of the present invention.

Referring to FIG. 1, a mobile device 1 according to an embodiment of the present invention includes a plurality of front end modules connected to different antennas among a plurality of antennas ANT1 to ANT6 and a plurality of antennas ANT1 to ANT6. (FEM1 to FEM6) may be included.

The mobile device 1 performs wireless communication of a plurality of standards, such as cellular (LTE/WCDMA/GSM) communication, WiFi communication of 2.4 GHz and 5 GHz, and Bluetooth communication. A plurality of antennas ANT1 to ANT6 and a plurality of front end modules FEM1 to FEM6 included in the mobile device support wireless communication of a plurality of standards.

A MIMO (Multi-Input/Multi-Output) system may be applied to the mobile device 1. MIMO is a technology that can increase the bandwidth in proportion to the number of antennas. If N antennas are used, frequency efficiency of N times as compared to a single antenna can be obtained. However, according to the trend of slimming and miniaturization of mobile devices, there is a limit to the space in which an antenna is mounted, and physical restrictions are imposed on additionally implementing a plurality of antennas in a terminal under the condition that antennas used in the existing system are present. Accordingly, a front end module connected to any one antenna needs to support a plurality of standard wireless communications.

Meanwhile, even when MIMO is applied to a mobile device, various mobile devices may employ different numbers of antennas. That is, even when one front-end module is designed to support wireless communication of a plurality of standards using one antenna, if there is an extra antenna available in the mobile device, wireless communication is performed using different antennas. What to do can be advantageous in terms of frequency efficiency. Therefore, the front-end module needs to support various types of platforms.

2 and 3 are block diagrams of a front end module according to an embodiment of the present invention.

The front end module according to an embodiment of the present invention may include a first filter (F1), a second filter (F2), a third filter (F3), a fourth filter (F4), and a switch (SW). , In addition, a first antenna terminal (T_ANTa), a second antenna terminal (T_ANTb), a first terminal (T1), a second terminal (T2), a third terminal (T3), and a fourth terminal (T4). I can. The first antenna ANTa may be connected to the first antenna terminal T_ANTa, and the second antenna ANTb may be connected to the second antenna terminal T_ANTb.

The first filter F1, the second filter F2, the third filter F3, the fourth filter F4, and the switch SW may constitute a switched triplexer.

The first filter F1 and the second filter F2 may be understood as a main filter that is always connected to the first antenna terminal T_ANTa, and the third filter F3 and the fourth filter F4 are switches. Through (SW), it may be understood as a sub-filter selectively connected to the first antenna terminal T_ANTa and the second antenna terminal T_ANTb. The first filter F1 and the second filter F2 may constitute a main filter unit, and the third filter F3 and the fourth filter F4 may constitute a sub filter unit.

The first filter F1 is disposed between the first antenna terminal T_ANTa and the first terminal T1. One end of the first filter F1 is connected to the first antenna terminal T_ANTa, and the other end of the first filter F1 is connected to the first terminal T1.

The first filter F1 supports cellular communication in a first frequency band, specifically, a Sub-6 GHz band. As an example, the first filter F1 may support cellular communication in a 3.3 GHz to 4.2 GHz band (n77 band). According to an embodiment, the first filter F1 may support cellular communication in a 3.3 GHz to 3.8 GHz band (n78 band).

The first filter F1 operates as a band pass filter. As an example, the first filter F1 may include a band pass filter having a pass band of 3.3 GHz to 4.2 GHz, and a lower limit frequency of 3.3 GHz and an upper limit frequency of 4.2 GHz. According to an embodiment, the first filter F1 may include a band pass filter having a pass band of 3.3 GHz to 3.8 GHz and a lower limit frequency of 3.3 GHz and an upper limit frequency of 3.8 GHz.

Meanwhile, referring to FIG. 3, according to an embodiment, the first filter F1 is omitted from the front end module, and the front end module includes a second filter F2, a third filter F3, and a fourth filter F4. ), and a switch (SW).

The second filter F2 is disposed between the first antenna terminal T_ANTa and the second terminal T2. One end of the second filter F2 is connected to the first antenna terminal T_ANTa, and the other end of the second filter F2 is connected to the second terminal T2.

The second filter F2 supports Wi-Fi communication in a second frequency band, specifically, a 5 GHz band. For example, the second filter F2 may support Wi-Fi communication in a band of 5.15 GHz to 5.950 GHz.

The second filter F2 operates as a band pass filter. For example, the second filter F2 may include a band pass filter having a pass band of 5.15 GHz to 5.950 GHz band, a lower limit frequency of 5.15 GHz and an upper limit frequency of 5.950 GHz.

The first filter F1 and the second filter F2 are respectively connected to the first antenna terminal T_ANTa. Accordingly, the first antenna ANTA connected to the first antenna terminal T_ANTa may simultaneously perform cellular communication in the Sub-6 GHz band and Wi-Fi communication in the 5 GHz band.

Meanwhile, referring to FIG. 2, since the first filter F1 supporting cellular communication in the Sub-6 GHz band and the second filter F2 supporting Wi-Fi communication in the 5 GHz band share one antenna, different Compared to the case where the filters are connected to different antennas, it is necessary to have higher attenuation characteristics.

For example, when the first filter F1 supporting cellular communication in the Sub-6 GHz band and the second filter F2 supporting Wi-Fi communication in the 5 GHz band are connected to separate antennas, the first filter F1 And assuming that each of the second filters F2 requires an attenuation characteristic of 25 dB, when the first filter F1 and the second filter F2 are connected to one antenna, an antenna isolation degree of 10 dB. Since characteristics are additionally required, each of the first filter F1 and the second filter F2 needs to have a total attenuation characteristic of 35dB or more.

Although the BAW filter has excellent attenuation characteristics, it is difficult to form a wide passband, and thus, it is difficult to apply to 5G communication requiring broadband frequency characteristics. Accordingly, in order to satisfy the broadband frequency characteristic, the first filter F1 and the second filter F2 of the present invention may be formed of an LC filter implemented by a combination of a capacitor and an inductor.

The third filter F3 is disposed between the switch SW and the third terminal T3. One end of the third filter F3 is connected to the switch SW, and the other end of the third filter F3 is connected to the third terminal T3.

The third filter F3 supports Wi-Fi communication in a third frequency band, specifically, a 2.4 GHz band. As an example, the third filter F3 may support Wi-Fi communication in the 2.4GHz to 2.4835GHz band.

The third filter F3 operates as a band pass filter. As an example, the third filter F3 may include a band pass filter having a pass band of 2.4 GHz to 2.4835 GHz and a lower limit frequency of 2.4 GHz and an upper limit frequency of 2.4835 GHz.

For example, the third filter F3 may be composed of a BAW filter having excellent attenuation characteristics. The third filter F3 composed of the BAW filter may have sufficient attenuation characteristics for adjacent LTE B40/B41 bands.

The fourth filter F4 is disposed between the switch SW and the fourth terminal T4. One end of the fourth filter F4 is connected to the switch SW, and the other end of the fourth filter F4 is connected to the fourth terminal T4.

The fourth filter F4 supports cellular communication in a fourth frequency band, specifically, a band less than 3 GHz. For example, the fourth filter F4 may support cellular communication in a 1.7 GHz to 2.0 GHz band (LTE MB), or may support cellular communication in a 2.3 GHz to 2.7 GHz band (LTE HB).

The fourth filter F4 operates as a low-pass filter. As an example, the fourth filter F4 may include a low-pass filter having a pass band of 2.0 GHz or less or 2.7 GHz or less and an upper limit frequency of 2.0 GHz or 2.7 GHz. The fourth filter F4 may be composed of an LC filter, and may be integrated into one filter together with the first filter F1 and the second filter F2 composed of an LC filter.

The switch SW is implemented as a 4-terminal switch in the form of Double Pole Double Throw (DPDT). The switch SW includes a plurality of first-side terminals provided on a first side and a plurality of second-side terminals provided on a second side corresponding to the other side of the first side. Here, the first side may be understood as a side of the first antenna terminal T_ANTa and the second antenna terminal T_ANTb, and the second side may be understood as a third filter F3 and a fourth filter F4 side.

The plurality of first-side terminals includes a 1-1 terminal T1-1, and a 1-2 terminal T1-2 disposed on the first antenna terminal T_ANTa and the second antenna terminal T_ANTb side. The plurality of second terminal terminals 2-1 terminal (T2-1) and 2-2 terminal (T2-2) disposed on the side of the third filter (F3) and the fourth filter (F4) It may include. The switch SW additionally includes a first connector cnt1 and a second connector cnt2.

The 1-1 terminal T1-1 is connected to the first antenna terminal T_ANTa, the 1-2 terminal T1-2 is connected to the second antenna terminal T_ANTb, and the 2-1 terminal ( T2-1) is connected to the third filter (F3), and the 2-2 terminal (T2-2) is connected to the fourth filter (F4).

The first connector cnt1 has one end connected to the 1-1 terminal T1-1, and the other end connected to one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2. It may be selectively connected or may not be connected to any one by operating off. Therefore, the 1-1 terminal (T1-1) is connected to one of the 2-1 terminal (T2-1) and the 2-2 terminal (T2-2) according to the switching operation of the first connector (cnt1). Or it may not be connected to either.

The second connector cnt2 has one end connected to the 1-2 terminal T1-2, and the other end connected to one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2. It may be connected, or may not be connected to any one by operating off. Accordingly, the 1-2 terminal T1-2 is connected to one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2 according to the switching operation of the first connector cnt1. It may be connected or not connected to either.

Any one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2 may be connected to at most one of the first connector cnt1 and the second connector cnt2. . Therefore, any one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2 is connected to one of the first connector cnt1 and the second connector cnt2, or , It may not be connected to both the first connector cnt1 and the second connector cnt2.

Various combinations of filters may be connected to the first antenna ANTa and the second antenna ANTb according to the switching operation of the first connector cnt1 and the second connector cnt2.

For example, when the first connector cnt1 connects the 1-1 terminal T1-1 and the 2-1 terminal T2-1, a second filter F2 supporting Wi-Fi communication in a 5GHz band A third filter F3 supporting Wi-Fi communication in the and 2.4 GHz band may be connected to one first antenna ANTA.

In addition, when the first connector cnt1 connects the 1-1 terminal T1-1 and the 2-2 terminal T2-2, the second filter F2 supporting Wi-Fi communication in the 5 GHz band A fourth filter F4 supporting cellular communication in a band less than 3 GHz may be connected to one first antenna ANTA.

In addition, when the second connector cnt2 connects the 1-2 terminal T1-2 and the 2-1 terminal T2-1, a second filter F2 supporting Wi-Fi communication in the 5GHz band and The third filter F3 supporting Wi-Fi communication in the 2.4 GHz band may be connected to different antennas.

In addition, when the second connector cnt2 is connected to the 1-2 terminal (T1-2) and the terminal 2-2 (T2-2), the second filter (F2) for supporting Wi-Fi communication in the 5GHz band and The fourth filter F4 supporting cellular communication in a band less than 3 GHz may be connected to different antennas.

In addition to the above-described embodiments, the first connector cnt1 connects the 1-1 terminal T1-1 and the 2-1 terminal T2-1, and the second connector cnt2 is the first connector. By connecting the 2nd terminal T1-2 and the 2nd-2nd terminal T2-2, the third filter F3 is connected to the first antenna ANTA, and the fourth filter F4 is connected to the second antenna ( ANTb) can be connected. Furthermore, the first connector cnt1 connects the 1-1 terminal T1-1 and the 2-2 terminal T2-2, and the second connector cnt2 is the 1-2 terminal T1-2. ) And the 2-1 terminal T2-1, the third filter F3 may be connected to the second antenna ANTb, and the fourth filter F4 may be connected to the first antenna ANT1. . The third filter F3 and the fourth filter F4 may be connectable to different antenna terminals among the first antenna terminal ANTa and the second antenna terminal ANTb.

4A is a block diagram of a front end module according to a first switching operation of a switch according to an embodiment of the present invention, and FIG. 4B is a front end module according to a first switching operation of a switch according to an embodiment of the present invention. Represents the frequency response.

In FIG. 4B, a first graph (graph1) represents the frequency response of the first filter (F1), a second graph (graph2) represents the frequency response of the second filter (F2), and a third graph (graph3) represents the 3 shows the frequency response of the filter F3.

Referring to FIG. 4A, in accordance with the first switching operation of the switch SW, the other end of the first connector cnt1 is connected to the 2-1 terminal T2-1, and thus the first terminal T1-1 ) Is connected to the 2-1 terminal T2-1. In addition, since the other end of the second connector cnt2 is turned off, the 1-2 terminal T1-2 is not connected to the 2-1 terminal T2-1 and the 2-2 terminal T2-2. Does not.

That is, according to the first switching operation of the switch SW, the first antenna ANTA is connected to the first filter F1, the second filter F2, and the third filter F3. By a first filter (F1) supporting cellular communication in the Sub-6 GHz band, a second filter supporting Wi-Fi communication in the 5 GHz band (F2), and a third filter (F3) supporting Wi-Fi communication in the 2.4 GHz band. , The frequency response shown in FIG. 4B may appear.

5A is a block diagram of a front end module according to a second switching operation of a switch according to an embodiment of the present invention, and FIG. 5B is a front end module according to a second switching operation of a switch according to an embodiment of the present invention. Represents the frequency response.

In FIG. 5B, a first graph (graph1) represents the frequency response of the first filter (F1), a second graph (graph2) represents the frequency response of the second filter (F2), and a third graph (graph3) represents the 4 shows the frequency response of the filter F4.

Referring to FIG. 5A, in accordance with the second switching operation of the switch SW, the other end of the first connector cnt1 is connected to the 2-2 terminal T2-2, and thus the 1-1 terminal T1-1 ) Is connected to the 2-2 terminal T2-2. In addition, the other end of the second connector cnt2 is turned off, so that the 1-2 terminal T1-2 is not connected to the 2-1 terminal T2-1 and the 2-2 terminal T2-2. Does not.

That is, according to the second switching operation of the switch SW, the first antenna ANTA is connected to the first filter F1, the second filter F2, and the fourth filter F4. By a first filter (F1) supporting cellular communication in the Sub-6 GHz band, a second filter supporting Wi-Fi communication in the 5 GHz band (F2), and a fourth filter (F4) supporting cellular communication in a sub-3 GHz band. , The frequency response shown in FIG. 5B may appear.

Meanwhile, in FIGS. 4A and 5A, the 1-1 terminal T1-1 is selectively connected to one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2, and Although the switching operation in which the 1-2 terminal T1-2 is turned off has been described, the switch SW may operate in various forms. For example, the 1-1 terminal (T1-1) is connected to the 2-1 terminal (T2-1), the 1-2 terminal (T1-2) is connected to the 2-2 terminal (T2-2) Can be connected. In addition, the 1-1 terminal (T1-1) is not connected to the 2-1 terminal (T2-1) and the 2-2 terminal (T2-2), and the 1-2 terminal (T1-2) is It may be selectively connected to one of the 2-1 terminal T2-1 and the 2-2 terminal T2-2.

6A is a schematic circuit diagram of a switch according to an embodiment of the present invention, FIG. 6B is an equivalent circuit diagram when the switch of FIG. 6A is turned on, and FIG. 6C is a circuit diagram when the switch of FIG. 6A is turned off. The configuration of the switch shown in FIG. 6A is exemplary, and the switch of the present invention may be modified in various forms.

Referring to FIG. 6A, the switch is disposed in the signal transmission path between the terminal Ta and the terminal Tb and is disposed between a plurality of first transistors Tr1 operated by the first control signal G1 and the terminal Tb and the ground. 2 It may include a plurality of second transistors Tr2 operated by the control signal G2.

Referring to FIG. 6B, when the switch is turned on, the plurality of first transistors Tr1 are turned on by the first control signal G1 to be equivalent to a resistance component, and the plurality of second transistors Tr2 are It operates off by the second control signal G2, and is equivalent to a capacitor component.

Referring to FIG. 6C, when the switch is turned off, the plurality of first transistors Tr1 are turned off by the first control signal G1 to be equivalent to a capacitor component, and the plurality of second transistors Tr2 are It operates on by the second control signal G2 and is equivalent to a resistance component.

Meanwhile, as described above, the other end of the first connector cnt1 is turned off, so that the 1-1 terminal T1-1 is the 2-1 terminal T2-1 and the 2-2 terminal T2. It may not be connected to any one of -2).

In this case, the first filter F1 and the second filter F2 must be connected to the first antenna ANta to transmit and receive RF signals, but through the first filter F1 and the second filter F2. There may be a problem that the transmitted and received RF signals are bypassed to the ground of FIG. 6C.

7 is a block diagram of a front end module according to another embodiment of the present invention.

Since the front end module according to the exemplary embodiment of FIG. 7 is similar to the front end module according to the exemplary embodiment of FIG. 2, overlapping descriptions will be omitted, and differences will be mainly described.

Referring to FIG. 7, the front-end module may further include a matching unit MU having a matching network, and the switch SW is a matching unit MU having a matching network. It may further include a 2-3 terminal (T2-3) connected to.

In the first connector cnt1 of the switch SW according to the present embodiment, the 1-1 terminal T1-1 is the 2-1 terminal T2-1 and the 2-2 terminal T2-2. In the off operation state not connected to, it is connected to the 2-3rd terminal T2-3.

The matching network provided in the matching unit MU secures a sufficiently large impedance, so that the first connector cnt1 is the first-first terminal T1-1 and the second-third terminal T2-3. Even in the case of connecting to, an open state may be provided for a signal path between the first antenna terminal T_ANTa and the first filter F1 and the second filter F2.

Therefore, through the matching network of the matching unit (MU), on the signal path between the first antenna terminal (T_ANTa) and the first filter (F1) and the second filter (F2), the problem of RF signal loss It can be solved.

On the other hand, the attenuation characteristics of the third filter (F3) or the fourth filter (F4) for the pass band of 3.3 GHz to 4.2 GHz of the first filter (F1) and the pass band of 5.15 GHz to 5.950 GHz of the second filter (F2) When this 40dB can be secured, a front end module can be configured as shown in FIG. 7. However, the attenuation characteristics of the third filter (F3) or the fourth filter (F4) for the pass band of 3.3 GHz to 4.2 GHz of the first filter (F1) and the pass band of 5.15 GHz to 5.950 GHz of the second filter (F2) If 40dB is not secured, a separate filter needs to be provided.

In addition, the attenuation characteristic of the first filter (F1) or the second filter (F2) is 40 dB for the pass band of the third filter (F3) of 2.4 GHz to 2.4835 GHz and the pass band of less than 3 GHz of the fourth filter (F4). If it can be secured, the front end module may be configured as shown in FIG. 7. However, the attenuation characteristics of the first filter (F1) or the second filter (F2) for the pass band of 2.4 GHz to 2.4835 GHz of the third filter (F3) and less than 3 GHz of the fourth filter (F4) is 40 dB. If not secured, a separate filter needs to be provided.

8 and 9 are block diagrams of a front end module according to another embodiment of the present invention.

Referring to FIG. 8, the front end module according to an embodiment of the present invention includes a fifth filter F5 disposed between a first antenna terminal T_ANTa and a 1-1 terminal T1-1 of the switch SW. ) May be further included. The fifth filter F5 may be composed of an LC filter.

The fifth filter F5 operates as a band-stop filter. As an example, the fifth filter F5 may operate as a band-stop filter having a lower limit frequency of 3.3 GHz and an upper limit frequency of 6.0 GHz.

The fifth filter F5 is disposed between the 1-1 terminal T1-1 and the first antenna terminal T_ANTa. The fifth filter F5 is disposed in the signal path between the third filter F3 and the first antenna terminal T_ANTa or in the signal path between the fourth filter F4 and the first antenna terminal T_ANTa, Attenuation characteristics of 40dB or more may be provided to the filter F3 and the fourth filter F4.

9, the front end module according to an embodiment of the present invention includes a sixth filter F6 disposed between the first antenna terminal T_ANTa and the first filter F1/second filter F2. It may contain more. The sixth filter F6 may be composed of an LC filter.

The sixth filter F6 operates as a band-stop filter. As an example, the sixth filter F6 may operate as a band-stop filter having a lower limit frequency of 1.7 GHz and an upper limit frequency of 2.7 GHz.

The sixth filter F6 is disposed in a signal path between the first antenna terminal T_ANTa and the first filter F1 and the second filter F2. The sixth filter F6 is disposed in the signal path between the first filter F1 and the first antenna terminal T_ANTa or in the signal path between the second filter F2 and the first antenna terminal T_ANTa, Attenuation characteristics of 40dB or more may be provided to the filter F1 and the second filter F2.

10 is a block diagram illustrating an example of an amplification unit connected to a filter according to an embodiment of the present invention.

In FIG. 10, the filter F has a configuration corresponding to any one of the first filter F1, the second filter F2, the third filter F3, and the fourth filter F4 of the above-described embodiments. Can be understood. In addition, the receiving end (Rx) and the transmitting end (Tx) may be understood as a configuration included in any one of the first terminal (T1) to the fourth terminal (T4) according to various embodiments of the present invention. For example, the first terminal T1 may include a receiving end Rx and a transmitting end Tx.

The amplification unit AU may include a switch SW, a low noise amplifier (LNA), and a power amplifier (PA).

Referring to FIG. 10, the filter F is connected to one end of the low noise amplifier LNA and one end of the power amplifier PA through the switch SW. The low noise amplifier LNA may be disposed in the reception path Rx_RF of the RF signal, and the power amplifier PA may be disposed in the transmission path Tx_RF of the RF signal. In addition, the other end of the low noise amplifier (LNA) is connected to the receiving end (Rx), and the other end of the power amplifier (PA) is connected to the transmitting end (Tx).

In FIG. 10, it is shown that the low noise amplifier (LNA) is arranged in the reception path (Rx_RF) and the power amplifier (PA) is arranged in the transmission path (Tx_RF), but depending on the need for amplification according to design, the reception path The low noise amplifier LNA may be removed from (Rx_RF), or the power amplifier PA may be removed from the transmission path Tx_RF.

In the above, the present invention has been described by specific matters such as specific elements and limited embodiments and drawings, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , Anyone with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention is limited to the above-described embodiments and should not be defined, and all modifications that are equally or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. I would say.

ANT: antenna
F1: first filter
F2: second filter
F3: third filter
F4: fourth filter

Claims (16)

A first antenna terminal to which the first antenna is connected;
A second antenna terminal to which a second antenna is connected;
A plurality of first-side terminals provided on a first side and a plurality of second-side terminals provided on a second side corresponding to the other side of the first side, and each of the plurality of first-side terminals includes the first A switch connected to different antenna terminals of the antenna terminal and the second antenna terminal;
A first filter connected to skip the switch between the first antenna terminal and the first terminal and having a pass band of a first frequency band;
A second filter connected to skip the switch between the first antenna terminal and the second terminal and having a pass band of a second frequency band;
A third filter connected to a third terminal, connected to one of the plurality of second side terminals, and having a pass band of a third frequency band; And
A fourth filter connected to a fourth terminal, connected to another one of the plurality of second-side terminals, and having a pass band of a fourth frequency band; Including,
The third filter and the fourth filter may be connected to different antenna terminals of the first antenna terminal and the second antenna terminal.
The method of claim 1,
The plurality of first-side terminals include a 1-1 terminal connected to the first antenna terminal and a 1-2 terminal connected to the second antenna terminal,
The plurality of second side terminals includes a 2-1 terminal connected to the third filter and a 2-2 terminal connected to the fourth filter.
The method of claim 2, wherein the switch,
A first connector including one end connected to the 1-1 terminal and the other end connected to one of the 2-1 terminal and the 2-2 terminal or operating off, and
A front end module further comprising a second connector including one end connected to the 1-2 terminal and the other end connected to one of the 2-1 terminal and the 2-2 terminal, or operating off.
The method of claim 3,
Any one of the 2-1 terminal and the 2-2 terminal is connected to at least one of the first connector and the second connector.
The method of claim 3,
The other end of the first connector is connected to the 2-1 terminal, and the other end of the second connector is connected to the 2-2 terminal.
The method of claim 3,
The other end of the first connector is connected to the 2-2 terminal, and the other end of the second connector is connected to the 2-1 terminal.
The method of claim 3, wherein the switch,
The front end module further comprises a 2-3rd terminal connected to a matching network that provides an open state for a signal path between the first antenna terminal and the first filter and the second filter.
The method of claim 7,
The first connector is a front end module connected to the 2-3rd terminal during the off operation.
The method of claim 2,
A fifth filter disposed between the first antenna terminal and the first-first terminal to provide an attenuation characteristic of 40dB or more to the third filter and the fourth filter; The front-end module further comprising.
The method of claim 2,
A sixth filter disposed in a signal path between the first antenna terminal and the first filter and the second filter to provide an attenuation characteristic of 40dB or more to the first filter and the second filter; The front-end module further comprising.
The method of claim 1,
The first filter supports cellular communication in the Sub-6 GHz band,
The second filter supports Wi-Fi communication in a 5GHz band,
The third filter supports Wi-Fi communication in the 2.4 GHz band,
The fourth filter is a front-end module supporting cellular communication in a band less than 3GHz.
The method of claim 1,
Each of the first filter, the second filter, and the fourth filter is composed of an LC filter, and the third filter is composed of a BAW filter.
A first antenna terminal to which the first antenna is connected;
A second antenna terminal to which a second antenna is connected;
A plurality of first-side terminals provided on a first side and a plurality of second-side terminals provided on a second side corresponding to the other side of the first side, and each of the plurality of first-side terminals includes the first A switch connected to different antenna terminals of the antenna terminal and the second antenna terminal;
A main filter unit including at least one main filter connected to skip the switch between the first antenna terminal and the first terminal or between the first antenna terminal and the second terminal; And
A plurality of sub-filters connected to third and fourth terminals, respectively, wherein the plurality of sub-filters comprises: a sub-filter unit connected to different second-side terminals of the plurality of second-side terminals; Including,
The plurality of sub-filters may be connected to different antenna terminals of the first antenna terminal and the second antenna terminal.
The method of claim 13,
The plurality of first-side terminals include a 1-1 terminal connected to the first antenna terminal and a 1-2 terminal connected to the second antenna terminal,
The plurality of second-side terminals include a 2-1 terminal connected to one of the plurality of sub-filters, and a 2-2 terminal connected to the other one of the plurality of sub-filters.
The method of claim 14, wherein the switch,
A first connector including one end connected to the 1-1 terminal and the other end connected to one of the 2-1 terminal and the 2-2 terminal or operating off, and
A front end module further comprising a second connector including one end connected to the 1-2 terminal and the other end connected to one of the 2-1 terminal and the 2-2 terminal, or operating off.
The method of claim 15, wherein the switch,
The front end module further comprises a 2-3rd terminal connected to a matching network that provides an open state with respect to the signal path between the first antenna terminal and the at least one main filter.

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