KR20200127953A - Front end module - Google Patents

Abstract

According to one embodiment of the present invention, a front end module capable of reducing the number of antennas mounted on a mobile device comprises: an antenna terminal; and a duplexer including a first filter connected to the antenna terminal and a second filter supporting wireless communication of a standard different from a standard supported by the first filter in a frequency band different from a frequency band of the first filter. Each of the first filter and the second filter may include an LC filter, and some operation time sections of the first filter may overlap with some operation time sections of the second filter. The first filter may include a plurality of series units connected in series between the antenna terminal and the first terminal, and a plurality of shunt units disposed between different nodes between the antenna terminal and the first terminal and the ground. The second filter may include a plurality of series units connected in series between the antenna terminal and the second terminal, and a plurality of shunt units disposed between different nodes between the antenna terminal and the second terminal and the ground. At least one of the plurality of shunt units of the first filter may include a capacitor and an inductor connected in series with each other to form an attenuation region. At least one of the plurality of shunt units of the second filter may include a capacitor and an inductor connected in series with each other to form an attenuation region.

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.

In the sub-6GHz band, a 4*4 MIMO (Multi-Input/Multi-Output) system is basically applied to improve frequency efficiency. MIMO is a technology that can increase the bandwidth in proportion to the number of antennas. If you use 4 antennas, you can get 4 times the frequency efficiency of a single antenna. However, according to the trend of slimming and miniaturization of mobile devices, there is a limit to the space in which antennas are mounted, and physical restrictions are imposed on additionally implementing four antennas in a terminal under the condition that antennas used in the existing system exist.

The present invention is to provide a front end module capable of reducing the number of antennas mounted on a mobile device.

A front end module according to an embodiment of the present invention includes an antenna terminal; And a duplexer including a first filter connected to the antenna terminal, and a second filter supporting wireless communication of a standard different from the standard supported by the first filter in a frequency band different from that of the first filter. Wherein, each of the first filter and the second filter includes an LC filter, a part of the operation time period of the first filter overlaps with a part of the operation time period of the second filter, and the first filter is an antenna terminal And a plurality of series portions connected in series between the and the first terminal, and a plurality of shunt portions disposed between the ground and different nodes between the antenna terminal and the first terminal, and the second filter includes the antenna terminal and the second A plurality of series portions connected in series between terminals, and a plurality of shunt portions disposed between different nodes between an antenna terminal and the second terminal and a ground, at least one of the plurality of shunt portions of the first filter It includes a capacitor and an inductor connected in series with each other to form an attenuation zone, and at least one of the plurality of shunt portions of the second filter may include a capacitor and an inductor connected in series with each other to form an attenuation zone.

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.

1 is a block diagram of a mobile device equipped with a front end module according to an embodiment of the present invention.
2 is a block diagram of a front end module according to an embodiment of the present invention.
3 is a circuit diagram of a duplexer according to an embodiment of the present invention.
4 shows a frequency response according to an embodiment of the present invention.
5 to 7 are block diagrams of a front end module according to various embodiments of the present disclosure.
8 is a block diagram illustrating an example of an amplification 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. Like reference numerals in the drawings 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 various standards such as cellular (LTE/WCDMA/GSM) communication, 2.4GHz and 5GHz Wi-Fi communication, 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 1 support wireless communication of various standards.

However, when a plurality of antennas ANT1 to ANT6 are implemented in a limited space of the mobile device 1, RF signals input and output from the plurality of antennas ANT1 to ANT6 interfere with each other, resulting in deterioration of the antenna performance. there is a problem.

Accordingly, there is a need for a front-end module connected to any one antenna to support a plurality of standard wireless communications, thereby reducing the number of antennas mounted in the mobile device 1.

2 is a block diagram 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 includes a first antenna terminal (T_ANTa), a first terminal (T1), a second terminal (T2), and a first filter (F1) and a second filter (F2). It may include a duplexer (DPX).

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 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 may support wireless communication of a standard different from the standard supported by the first filter F1 in a frequency band different from that of the first filter F1.

The first filter F1 supports cellular communication in a preset first frequency band of the 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) corresponding to the first frequency 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.

The second filter F2 supports Wi-Fi communication in the 5GHz 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.

According to an embodiment of the present invention, a first filter (F1) supporting cellular communication in a Sub-6 GHz band and a second filter (F2) supporting Wi-Fi communication in a 5 GHz band are configured as one duplexer (DPX). Further, by connecting the duplexer DPX to one first antenna ANTA, the number of antennas provided in the mobile device can be drastically reduced. Some of the operation time periods of the first filter F1 provided in one duplexer DPX may overlap with some of the operation time periods of the second filter F2. For example, the operation time period of the first filter F1 may coincide with the operation time period of the second filter F2, and the first antenna ANTA may simultaneously perform cellular communication and Wi-Fi communication with an external device. .

According to an embodiment of the present invention, by reducing the number of antennas provided in the mobile device, RF signals output from different antennas can be prevented from interfering with each other, thereby improving communication performance of the mobile device. Furthermore, by integrating filters supporting different standards into one front-end module, the total area of the front-end module can be reduced.

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. Therefore, in order to satisfy the wideband frequency characteristic, it is necessary to configure the filters as an LC filter implemented by a combination of a capacitor and an inductor.

3 is a circuit diagram of a duplexer according to an embodiment of the present invention.

Referring to FIG. 3, the duplexer DPX may include a first filter F1, a second filter F2, and an impedance matching unit IMU.

Each of the first filter F1 and the second filter F2 may include an LC filter implemented by a combination of a capacitor and an inductor. Each of the first filter F1 and the second filter F2 includes an LC filter and may have an attenuation characteristic of 35dB or more.

The first filter F1 includes a plurality of series portions SE1 to SE3 arranged in series between the first antenna terminal T_ANTa and the first terminal T1, and the first antenna terminal T_ANTa and the first terminal T1. ) And a plurality of shunt portions SH1 to SH3 disposed between different nodes and ground.

For example, the plurality of series portions SE1 to SE3 may include a first series portion SE1, a second series portion SE2, and a first series portion SE1 sequentially disposed between the first antenna terminal T_ANTa and the first terminal T1, and Including a third series portion (SE3), and the plurality of shunt portions (SH1 to SH3) is a first shunt portion disposed between the ground and a node between the first series portion (SE1) and the second series portion (SE2) ( SH1), a second shunt part (SH2) disposed between the node and the ground between the second series part (SE2) and the third series part (SE3), and between the third series part (SE3) and the first terminal (T1) It may include a third shunt portion (SH3) disposed between the node and the ground.

The first series part SE1 may include a capacitor C and an inductor L connected in parallel with each other, a capacitor C connected in parallel with each other, and a capacitor C connected in series with the inductor L. have.

The second series part SE2 may include a capacitor C, and the third series part SE3 includes a capacitor C and an inductor L connected in parallel with each other, and a capacitor C connected in parallel with each other. And it may include an inductor (L) connected in series with the inductor (L).

Each of the first shunt unit SH1, the second shunt unit SH2, and the third shunt unit SH3 may include a capacitor C and an inductor L connected in series.

The capacitors C and the inductors L provided in each of the first series part SE1 and the third series part SE3 and connected in parallel to each other may form an attenuation region by parallel resonance. The first series section (SE1) can form an attenuation range from 5.90 GHz to 6.0 GHz, specifically, about 5.95 GHz, and the third series section (SE3) is from 2.25 GHz to 2.35 GHz, specifically, about 2.3 GHz. It can form an attenuation zone.

According to an embodiment of the present invention, the first filter (F1) is, according to the attenuation band formed at about 5.95 GHz by the first series unit (SE1), the high frequency band (WiFi 5GHz high) of the WiFi 5GHz band. The attenuation characteristics can be improved, and the attenuation characteristics with the low frequency band (LTE HB low) among the LTE high bands (HB) can be improved according to the attenuation band formed at about 2.3 GHz by the third series unit (SE3). I can.

The capacitor C and the inductor L provided in each of the first shunt unit SH1, the second shunt unit SH2, and the third shunt unit SH3 may form an attenuation area by series resonance. The first shunt unit SH1 may form an attenuation band at 1.95 GHz to 2.05 GHz, specifically, about 2 GHz, and the second shunt unit SH2 forms an attenuation band at 2.64 GHz to 2.74 GHz and about 2.69 GHz. In addition, the third shunt unit SH3 may form an attenuation range in the range of 5.10 GHz to 5.20 GHz and about 5.15 GHz.

According to an embodiment of the present invention, the first filter F1 improves the attenuation characteristic with the 1.7 GHz to 2.0 GHz band (LTE MB) according to the attenuation band formed in the about 2 GHz band by the first shunt unit SH1. According to the attenuation band formed at about 2.69 GHz by the second shunt unit SH2, the attenuation characteristic with the high frequency band (LTE HB high) among the 2.3 GHz to 2.7 GHz band (LTE HB) can be improved. In addition, according to the attenuation band formed at about 5.15 GHz by the third shunt unit SH3, an attenuation characteristic with a lower frequency band (WiFi 5 GHz low) of the WiFi 5 GHz band may be improved.

The second filter F2 includes a plurality of series portions SE4 to SE7 arranged in series between the first antenna terminal T_ANTa and the second terminal T2, and the first antenna terminal T_ANTa and the second terminal T2. ) And a plurality of shunt units (SH4 to SH6) disposed between different nodes and ground.

As an example, the plurality of series portions SE4 to SE7 may include a fourth series portion SE4, a fifth series portion SE5, and a fourth series portion SE4 sequentially disposed between the first antenna terminal T_ANTa and the second terminal T2. Including a 6 series part (SE6) and a 7th series part (SE7), a plurality of shunt parts (SH4 to SH6) between the node and the ground between the fourth series part (SE4) and the fifth series part (SE5) The fourth shunt part SH4 disposed in the, the fifth shunt part SH5 disposed between the node and the ground between the fifth series part SE5 and the sixth series part SE6, and the sixth series part SE6 ) And a sixth shunt portion SH6 disposed between a node between the seventh series portion SE7 and the ground.

The fourth series part SE4 may include a capacitor C and an inductor L connected in parallel with each other, a capacitor C connected in parallel with each other, and a capacitor C connected in series with the inductor L. have. The fifth series portion SE5 may include an inductor L, and each of the sixth series portion SE6 and the seventh series portion SE7 may include a capacitor C.

The fourth shunt unit SH4 may include a capacitor C, and each of the fifth shunt unit SH5 and the sixth shunt unit SH6 includes a capacitor C and an inductor L connected in series. Can include.

According to an embodiment of the present invention, the capacitor C and the inductor L connected in parallel with each other of the fourth series unit SE4 may implement a second harmonic attenuation characteristic in the 11 GHz band.

In addition, the capacitor C and the inductor L provided in each of the fifth shunt unit SH5 and the sixth shunt unit SH6 may form an attenuation region by series resonance. The fifth shunt unit SH5 can form an attenuation band at 4.15 GHz to 4.25 GHz, specifically, about 4.2 GHz, and the sixth shunt unit SH6 is 3.70 GHz to 3.80 GHz, specifically, at about 3.75 GHz. It can form an attenuation zone.

According to an embodiment of the present invention, the second filter F2 has an attenuation characteristic with a higher frequency band (n77 high) of the n77 band according to the attenuation band formed in the about 4.20 GHz band by the fifth shunt unit SH5. The attenuation characteristic with the intermediate frequency band (n77 mid) of the n77 band may be improved according to the attenuation band formed at about 3.75 GHz by the sixth shunt unit SH6.

Meanwhile, in order to implement the first filter F1 and the second filter F2 as one duplexer DPX, the impedance of the passband of the first filter F1 and the impedance of the passband of the second filter F2 Need to match.

According to an embodiment of the present invention, an impedance matching unit IMU is provided between the first antenna terminal T_ANTa and the first filter F1/F2, and the first filter F1 and The impedance of each passband of the second filter F2 may be matched. The impedance matching unit IMU may be disposed between a node connected to each of the first antenna terminal T_ANTa, the first filter F1, and the second filter F2 and the ground.

The impedance matching unit IMU may include a matching inductor Lmat disposed between the first antenna terminal T_ANTa and the ground. The matching inductor Lmat may match the impedance of each passband of the first filter F1 and the second filter F2 to 50 ohms.

When a phase shifter in which a plurality of elements are arranged in a ð shape or a T shape is employed as an impedance matching unit, as the number of elements for impedance matching increases, signal loss increases. In particular, signal loss tends to occur even more when elements are placed on the signal path.

According to an embodiment of the present invention, the matching inductor Lmat for impedance matching is not directly disposed in the signal path, but is disposed between the first antenna terminal T_ANTa and the ground, which can be greatly advantageous in terms of signal loss. have.

4 shows a frequency response according to an embodiment of the present invention.

In FIG. 4, a first graph (graph1) represents the frequency response of the first filter (F1), and the second graph (graph2) represents the frequency response of the second filter (F2).

Referring to the first graph 1 of FIG. 4, the frequency response of the first filter F1 has a pass characteristic of about -1.53 dB at about 3.3 GHz and a pass characteristic of about -1.30 dB at about 4.20 GHz. The first filter F1 has a high attenuation characteristic for the 2.300 GHz to 2.600 GHz band allocated as an LTE communication band, and at the same time, a high attenuation characteristic for the 5.15 GHz to 5.950 GHz band allocated as a Wi-Fi communication band. I can.

Referring to the second graph 2 of FIG. 4, the frequency response of the second filter F2 has a pass characteristic of about -0.97 dB at about 5.15 GHz and a pass characteristic of about -0.66 dB at about 5.95 GHz. The second filter F2 may have a high attenuation characteristic for a 3.3GHz to 4.2GHz band allocated as a Sub-6GHz band.

According to an embodiment of the present invention, the first filter F1 may have an attenuation characteristic of about -39.05 dB at 5.15 GHz, and the second filter F2 has an attenuation characteristic of about -36.95 dB at 4.2 GHz. Therefore, even when the first filter F1 and the second filter F2 share one antenna, RF signals can be stably transmitted and received without interference.

According to an embodiment of the present invention, filters having high attenuation characteristics are implemented as a duplexer, which is greatly advantageous in terms of signal loss compared to a case where a separate diplexer is provided in addition to the filters, and due to component simplification, the front end The area of the module can be reduced, and the manufacturing cost can be reduced.

5 to 7 are block diagrams of a front end module according to various embodiments of the present disclosure.

Since the front end module according to the exemplary embodiment of FIGS. 5 to 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. 5, the front end module according to the embodiment of FIG. 5 may further include a third filter F3 and a switch SW as compared to the front end module according to the embodiment of FIG. 2. 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 cellular communication in a preset second frequency band of the Sub-6 GHz band. As an example, the third filter F3 may support cellular communication in a 4.4GHz to 5.0GHz band (n79 band) corresponding to the second frequency 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 4.4 GHz to 5.0 GHz and including a lower limit frequency of 4.4 GHz and an upper limit frequency of 5.0 GHz.

The switch SW is implemented as a 3-terminal switch in the form of SPDT (Single Pole Double Throw). One end of the switch SW may be connected to the first antenna terminal T_ANTa, and the other end of the switch SW may be selectively connected to the duplexer DPX and the third filter F3. The switch SW may selectively connect the duplexer DPX and the third filter F3 to the first antenna terminal T_ANTa.

The 4.4 GHz to 5.0 GHz band corresponding to the pass band of the third filter F3 is the 3.3 GHz to 4.2 GHz band corresponding to the pass band of the first filter F1 and the pass band of the second filter F2. Since the band gap is extremely narrow in the 5.15 GHz to 5.95 GHz band, RF signals may be transmitted and received through one first antenna ANTA in a time division method through the switch SW. Accordingly, the operation time period of the first filter F1 and the second filter F2 and the operation time period of the third filter F3 may be different from each other.

The front-end module according to the present embodiment includes cellular communication in the n77 band (3.3 GHz to 4.2 GHz) of the sub-6 GHz band and Wi-Fi communication in the 5 GHz band, as well as cellular communication in the n79 band (4.4 GHz to 5.0 GHz) of the sub-6 GHz band. Communication can be performed.

Referring to FIG. 6, the front end module according to the embodiment of FIG. 6 may further include a fourth filter F4 compared to the front end module according to the embodiment of FIG. 2.

The fourth filter F4 is disposed between the second antenna terminal T_ANTb and the fourth terminal T4. One end of the fourth filter F4 is connected to the second antenna terminal T_ANTb, and the other end of the fourth filter F4 is connected to the fourth terminal T4.

The fourth filter F4 supports Wi-Fi communication in the 2.4GHz band. As an example, the fourth filter F4 may support Wi-Fi communication in a 2.4 GHz to 2.4835 GHz band.

The fourth filter F4 operates as a band pass filter. As an example, the fourth filter F4 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.

The front-end module according to the present embodiment may perform wireless communication in the 2.4GHz band in addition to cellular communication in the n77 band (3.3GHz to 4.2GHz) of the sub-6GHz band and Wi-Fi communication in the 5GHz band.

Referring to FIG. 7, the front end module according to the embodiment of FIG. 7 further includes a third filter F3, a fourth filter F4, and a switch SW as compared to the front end module according to the embodiment of FIG. 2. Can include. The third filter F3, the fourth filter F4 and the switch SW of FIG. 7 are the same as the third filter F3 and the switch SW of FIG. 5 and the fourth filter F4 of FIG. 6. , Detailed description will be omitted.

The front-end module according to the present embodiment includes cellular communication in the n77 band (3.3 GHz to 4.2 GHz) of the sub-6 GHz band and Wi-Fi communication in the 5 GHz band, as well as cellular communication in the n79 band (4.4 GHz to 5.0 GHz) of the sub-6 GHz band. Communication and Wi-Fi communication in the 2.4GHz band can be performed.

8 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. 8, the filter F is the first filter F1, the second filter F2, the third filter F3, and the fourth filter F4 of FIGS. 2, 5, 6, and 7 It can be understood as a configuration corresponding to any one of. 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) of FIGS. 2, 5, 6, and 7. . 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. 8, 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. 8, 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 the design, 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.

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.

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
DPX: Duplexer

Claims (16)

Antenna terminals; And
A duplexer including a first filter connected to the antenna terminal, and a second filter supporting wireless communication of a standard different from the standard supported by the first filter in a frequency band different from that of the first filter; Including,
Each of the first filter and the second filter includes an LC filter, and a part of the operation time period of the first filter overlaps a part of the operation time period of the second filter,
The first filter includes a plurality of series portions connected in series between the antenna terminal and the first terminal, and a plurality of shunt portions disposed between ground and different nodes between the antenna terminal and the first terminal, ,
The second filter includes a plurality of series portions connected in series between the antenna terminal and the second terminal, and a plurality of shunt portions disposed between ground and different nodes between the antenna terminal and the second terminal, ,
At least one of the plurality of shunt portions of the first filter includes a capacitor and an inductor connected in series with each other to form an attenuation region,
At least one of the plurality of shunt portions of the second filter includes a capacitor and an inductor connected in series to each other to form an attenuation region.
The method of claim 1,
The duplexer further includes an impedance matching unit for matching the impedance of the pass band of the first filter and the impedance of the pass band of the second filter,
The impedance matching unit includes a matching inductor disposed between the antenna terminal and the ground.
The method of claim 1,
The first filter is a front-end module that supports cellular communication in a 3.3GHz ~ 4.2GHz band, and the second filter supports Wi-Fi communication in a 5.15GHz ~ 5.950GHz band.
The method of claim 3,
An attenuation band formed by a capacitor and an inductor connected in series with at least one of the plurality of shunt portions of the first filter is formed in 5.10 GHz to 5.20 GHz,
An attenuation band formed by a capacitor and an inductor connected in series with at least one of the plurality of shunt portions of the second filter is formed in a range of 4.15 GHz to 4.25 GHz.
The method according to claim 3 or 4,
At least one of the plurality of series portions of the first filter includes a capacitor and an inductor connected in parallel to each other to form an attenuation range in the range of 5.90 GHz to 6.0 GHz.
The method of claim 5,
At least one of the plurality of series portions of the first filter further includes a capacitor and an inductor connected in parallel to each other to form an attenuation range in 2.25 GHz to 2.35 GHz,
At least one of the plurality of shunt portions of the first filter is a capacitor and an inductor connected in series to form an attenuation band in 1.95 GHz to 2.05 GHz, and a capacitor and inductor connected in series to form an attenuation band in 2.64 GHz to 2.74 GHz. Further comprising a capacitor and an inductor,
At least one of the plurality of shunt portions of the second filter further comprises a capacitor and an inductor connected in series with each other to form an attenuation range in 3.70 GHz to 3.80 GHz.
The method of claim 1,
At least one of the plurality of series portions of the first filter includes a capacitor and an inductor connected in parallel to each other to form an attenuation region,
The frequency difference between the frequency band of the first filter and the attenuation band formed by at least one of the plurality of shunt parts of the first filter connected in series with each other is at least one of the plurality of series parts of the first filter A front-end module that is smaller than a frequency difference between a frequency band of the first filter and an attenuation band formed by a capacitor and an inductor connected in parallel with each other.
The method according to claim 1 or 7,
At least one of the plurality of series portions of the second filter includes a capacitor and an inductor connected in parallel to each other to form an attenuation region,
The frequency difference between the attenuation band formed by at least one of the plurality of shunt parts of the second filter in series with each other and the attenuation band formed by the capacitor and the inductor and the frequency band of the second filter is at least one of the plurality of series parts of the second filter A front-end module that is smaller than a frequency difference between a frequency band of the second filter and an attenuation band formed by a capacitor and an inductor connected in parallel with each other.
The method of claim 8,
At least one of a series part including a capacitor and an inductor connected in parallel among the plurality of series parts of the second filter has a second harmonic attenuation characteristic of a frequency band of the second filter.
The method of claim 1,
A front-end module in which an attenuation band formed by a capacitor and an inductor connected in series with at least one of the plurality of shunt portions of the first filter is formed such that the highest frequency of the frequency band of the first filter is located within.
The method of claim 10,
A front-end module in which an attenuation band formed by a capacitor and an inductor connected in series with at least one of the plurality of shunt portions of the second filter is formed such that the lowest frequency of the frequency band of the second filter is located within.
The method of claim 1,
At least one of the plurality of series portions of the first filter includes a capacitor and an inductor connected in parallel to each other to form an attenuation region,
The number of shunt parts including capacitors and inductors connected in series among the plurality of shunt parts of the first filter is greater than the number of series parts including capacitors and inductors connected in parallel among the plurality of series parts of the first filter. Many front-end modules.
The method of claim 1 or 12,
At least one of the plurality of series portions of the second filter includes a capacitor and an inductor connected in parallel to each other to form an attenuation region,
The number of shunt parts including capacitors and inductors connected in series among the plurality of shunt parts of the second filter is greater than the number of series parts including capacitors and inductors connected in parallel among the plurality of series parts of the second filter. Many front-end modules.
The method of claim 1,
A third filter having a passband in the 4.4GHz~5.0GHz band; And
A switch selectively connecting the duplexer and the third filter to the antenna terminal; The front-end module further comprising.
The method of claim 1,
A fourth filter having a pass band of 2.4 GHz to 2.4835 GHz; Including more,
The fourth filter is a front end module that is connected to an antenna terminal to which the duplexer is connected and another antenna terminal.
The method of claim 1,
Each of the first filter and the second filter has an attenuation characteristic of 35dB or more.

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