CN216721305U - Diversity radio frequency front end module - Google Patents

Abstract

The utility model discloses a diversity radio frequency front-end module, which comprises a radio frequency switch, a matching circuit and a multi-path filter, wherein the multi-path filter is divided into a higher frequency band group and a lower frequency band group, the matching circuit comprises a high-pass filter arranged between the filter of the higher frequency band group and the radio frequency switch, and a low-pass filter arranged between the filter of the lower frequency band group and the radio frequency switch. The utility model can realize carrier aggregation matching, not only enables different frequency bands to have good indexes such as insertion loss, return loss and the like when the carrier aggregation works, but also does not influence the performance of each frequency band when the single-path works.

Description

Diversity radio frequency front end module

Technical Field

The utility model belongs to the technical field of mobile communication, and particularly relates to a diversity radio frequency front-end module.

Background

The carrier aggregation is used in the radio frequency front-end module, so that discontinuous frequency bands can be aggregated, the available bandwidth can be widened, and the network transmission rate can be improved.

In the diversity radio frequency front end module in the prior art, as shown in fig. 1, each frequency band can work independently by controlling to turn on a single switch; and two or more switches can be controlled to be opened simultaneously, so that several frequency bands can work simultaneously during carrier aggregation. However, in the prior art, two or more filters in different frequency bands, especially in a frequency band with a large frequency difference, are directly combined by an opened switch, and the indexes such as insertion loss and return loss of the filters are deteriorated, which affects the normal operation of the system.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides the radio frequency front-end module capable of realizing carrier aggregation matching.

The utility model provides a diversity radio frequency front end module, includes radio frequency switch, matching circuit and multichannel filter, multichannel filter divide into higher frequency channel group and lower frequency channel group, matching circuit is including setting up the filter of higher frequency channel group with high pass filter between the radio frequency switch, and set up the filter of lower frequency channel group with low pass filter between the radio frequency switch.

Preferably, the high-pass filter is an LC high-pass filter.

Preferably, the low-pass filter is an LC low-pass filter.

Preferably, the higher frequency band group is an H band, and the lower frequency band group is an M band; or

The higher frequency band group is an H band, and the lower frequency band group is an L band; or

The higher frequency band group is M band, and the lower frequency band group is L band.

Compared with the prior art, the utility model has the following beneficial effects:

by arranging the high-pass filter between the higher frequency band filter and the radio frequency switch and arranging the low-pass filter between the lower frequency band filter and the radio frequency switch, the indexes of each frequency band during independent work can be ensured not to be influenced, and the frequency bands of the higher frequency band group and the frequency bands of the lower frequency band group also have good indexes (such as insertion loss, return loss and the like) during carrier aggregation work.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a diversity rf front-end module in the prior art;

FIG. 2 is a schematic structural diagram of a diversity RF front-end module according to the present invention;

FIG. 3 is a schematic diagram of a prior art B1/3 band and B40 band filter;

FIG. 4 is a graph of the frequency response of the prior art B1/3 band alone;

FIG. 5 is a graph of the frequency response of the prior art B40 band alone;

FIG. 6 is a schematic diagram of a matching circuit according to the present invention;

FIG. 7 is a frequency response graph of a matching circuit of the present invention;

FIG. 8 is a schematic diagram of a circuit structure of a combination of a B1/3 band and a B40 band in the embodiment of the present invention;

FIG. 9 is a simplified schematic diagram of the circuit configuration of FIG. 8;

FIG. 10 is a frequency response graph of carrier aggregation operation in B1/3 and B40 frequency bands without access to a matching circuit in the present invention;

FIG. 11 is a frequency response graph of carrier aggregation operation in B1/3 and B40 bands when the matching circuit is accessed in the present invention.

Wherein, 1, a radio frequency switch; 2, a filter; 3 a matching circuit; 31 a high pass filter; 32 low pass filter.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

A diversity rf front-end module, as shown in fig. 2, includes an rf switch 1, a matching circuit 3 and a multi-path filter 2, wherein the multi-path filter 2 is divided into a higher frequency band group and a lower frequency band group, the matching circuit 3 includes a high-pass filter 31 disposed between the filter 2 of the higher frequency band group and the rf switch 1, and a low-pass filter 32 disposed between the filter 2 of the lower frequency band group and the rf switch 1.

In this embodiment, taking the RX mid-high frequency commonly used for carrier aggregation as an example, the frequency band may be divided into two parts, i.e., an M band (corresponding to the lower frequency band group) and an H band (corresponding to the higher frequency band group), where the M band may correspond to frequency bands such as B1, B2, B3, B34, and B39, and is centered at 1805-2170 MHz; the H band can correspond to the frequency bands of B7, B40, B41, etc., and is centered at 2300 + 2700 MHz. The higher band group and the lower band group are not limited to H band and Mband in application, but may be other combinations, such as H band and L band, or M band and L band.

Now, the combination of the B1/3 band of M band and the B40 band of H band is taken as an example for explanation: fig. 3 shows a circuit structure before combining the B1/3 frequency band (B1: 2110-2170 MHz; B3: 1805-1880MHz) and the B40 frequency band (2300-2400MHz) in the prior art, fig. 4 shows a corresponding frequency response curve when the B1/3 frequency band is used alone in the prior art, fig. 5 shows a corresponding frequency response curve when the B40 frequency band is used alone in the prior art, fig. 6 shows a circuit structure adopted by the matching circuit in this embodiment, and fig. 7 shows a frequency response curve of the matching circuit. As can be seen from the figure 7, the matching circuit realizes broadband matching at the combining port, and the return loss S11 of the combining port is better than-15 dB between 1.8GHz and 2.8 GHz.

As shown in fig. 8, when the B1/3 band is combined with the B40 band, the low pass filter end of the matching circuit is connected to the filter of the B1/3 band, and the high pass filter end of the matching circuit is connected to the filter of the B40 band. Combining two inductors connected in parallel at the high-pass filter into one inductor can obtain the circuit structure shown in fig. 9.

Fig. 10 shows frequency response curves of carrier aggregation operation of B1/3 and B40 frequency bands when the matching circuit is not accessed, and fig. 11 shows frequency response curves of carrier aggregation operation of B1/3 and B40 frequency bands when the matching circuit is accessed. It can be seen that, after the matching circuit is accessed, the insertion loss and return loss of different frequency bands during carrier aggregation operation are obviously improved.

In one embodiment, the high pass filter 31 may be an LC high pass filter. As shown in fig. 6, the LC high-pass filter includes a capacitor and an inductor, the capacitor is connected in series between the radio frequency switch and the filter, one end of the inductor is connected between the capacitor and the filter, and the other end of the inductor is grounded.

In one embodiment, the low pass filter 32 may be an LC low pass filter. As shown in fig. 6, the LC low-pass filter includes a capacitor and an inductor, the inductor is connected in series between the radio frequency switch and the filter, one end of the capacitor is connected between the inductor and the filter, and the other end of the capacitor is grounded.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (4)

1. The utility model provides a diversity radio frequency front end module, includes radio frequency switch, matching circuit and multichannel filter, its characterized in that, multichannel filter divide into higher frequency channel group and lower frequency channel group, matching circuit is including setting up the filter of higher frequency channel group with high pass filter between the radio frequency switch, and set up the filter of lower frequency channel group with low pass filter between the radio frequency switch.

2. The diversity rf front-end module of claim 1, wherein:

the high pass filter is an LC high pass filter.

3. The diversity rf front-end module of claim 1, wherein:

the low pass filter is an LC low pass filter.

4. The diversity rf front-end module of claim 1, wherein:

the higher frequency band group is an H band, and the lower frequency band group is an M band; or

The higher frequency band group is an H band, and the lower frequency band group is an L band; or

The higher frequency band group is M band, and the lower frequency band group is L band.

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