Multi-band inter-band combiner, antenna device and terminal

Abstract

The utility model relates to a multi-band inter-band combiner, an antenna device and a terminal, and is applied to the technical field of communication, the multi-band inter-band combiner comprises a plurality of sub-band combiners, each sub-band combiner comprises a duplexer and a receiving filter combination, and each receiving filter combination comprises a plurality of receiving filters; the duplexers are configured with different frequency bands; the frequency bands of the receiving filters in the receiving filter combination are different, and the frequency bands of the receiving filters comprise the frequency bands of other duplexers; the inter-sub-band combiner is connected with a respective antenna, and the duplexer and each receiving filter in the inter-sub-band combiner are connected with the antenna. The problems that in the prior art, due to the fact that aggregated Bands are distributed on different antennas, the requirement for the number of the antennas is large, and cost is high are solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a multi-band inter-band combiner, an antenna device and a terminal. Background Art

[0002] With the rapid development of wireless cellular communications, from 4G to 5G, for high-speed applications, in order to increase the amount of uplink and downlink data, carrier aggregation is a very common practice.

[0003] Inter-band combination with FDD (frequency division duplex) frequency band is a common and almost the most combined combination mode. Currently, in order to realize inter-band combination, take the inter-band combination of two bands as an example, the uplink BX (frequency band is X) and BY (frequency band is Y) are transmitted one way each, and the downlink BX and BY are transmitted two ways each, see Figure 1 Usually, an independent transmitting and receiving duplexer is used for each of the two frequency bands. A BX duplexer is needed to connect to one antenna, a BY duplexer to one antenna, and then the remaining downlink BX and BY transmissions are connected to one antenna. The BX+By two-in-one receiving filter is connected to one antenna, or the BX receiving filter and the BY receiving filter are connected to one antenna each. That is to say, at least three antennas are needed to achieve this, which makes the overall cost higher. Utility Model Content

[0004] The present application provides a multi-band inter-band combiner, an antenna device and a terminal, which are used to solve the problem in the prior art that aggregated bands are allocated to different antennas, resulting in a large number of antennas and high costs.

[0005] In a first aspect, an embodiment of the present application provides a multi-band inter-band combiner, including: a plurality of inter-sub-band combiners, the inter-sub-band combiners including a duplexer and a receive filter combination, each of the receive filter combinations including a plurality of receive filters;

[0006] Each of the duplexers is configured with a different frequency band;

[0007] The frequency bands of the receiving filters in the receiving filter combination are different, and the frequency bands of the receiving filters include the frequency bands of other duplexers;

[0008] The inter-sub-band combiner is connected to respective antennas, and the duplexer and each of the receiving filters in the inter-sub-band combiner are connected to the antennas.

[0009] Optionally, the multi-band inter-band combiner is an inter-band combiner for M frequency bands, the number of the inter-sub-band combiners is N, each of the receive filter combinations includes M-1 receive filters, and M≥N≥2.

[0010] Optionally, when M is greater than N, the frequency band of the receiving filter also includes a frequency band in the M frequency bands that is different from the frequency band of the duplexer.

[0011] Optionally, the duplexer is connected to the antenna via a first impedance transformation circuit.

[0012] Optionally, the first impedance transformation circuit is used to adjust the impedance transformation of the path where the duplexer is located to a target impedance, and the target impedance is greater than a preset impedance.

[0013] Optionally, the first impedance transformation circuit is an LC impedance transformation network.

[0014] Optionally, the receiving filter is connected to the antenna via a second impedance transformation circuit.

[0015] Optionally, the second impedance transformation circuit is used to adjust the impedance transformation of the path where the receiving filter is located to be greater than a preset impedance.

[0016] In a second aspect, an embodiment of the present application provides an antenna device, comprising the multi-band inter-band combiner and an antenna as described in the first aspect.

[0017] In a third aspect, an embodiment of the present application provides a terminal, a terminal body and the antenna device described in the second aspect.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the multi-band inter-band combiner provided by the embodiment of the present application includes multiple sub-band inter-band combiners, the sub-band inter-band combiner includes a duplexer and a receiving filter combination, each receiving filter combination includes multiple receiving filters; each duplexer is configured with a different frequency band; the frequency band of each receiving filter in the receiving filter combination is different, and the frequency band of the receiving filter includes the frequency band of other duplexers; the sub-band inter-band combiner is connected to the respective antennas, and the duplexer and each receiving filter in the inter-band combiner are connected to the antenna. In this way, by setting the receiving filter and connecting it to the antenna connected to the duplexer, the aggregated receiving filter does not need to set up a new antenna, and can also achieve inter-band combination, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic diagram of the structure of a multi-band inter-band combiner provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of another multi-band inter-band combiner provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of the equivalent impedance provided by the embodiment of the present application;

[0024] Figure 4 A schematic diagram of the impedance region of the Smith diagram provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of path loss when no impedance transformation circuit is provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of path loss when an impedance conversion circuit is provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the impedance region of the Smith diagram provided in the embodiment of the present application;

[0028] Figure 8 A schematic diagram of path loss when an impedance transformation circuit is set according to another embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] Figure 1 A schematic diagram of the structure of a multi-band inter-band combiner provided in an embodiment of the present application, see Figure 1 , the multi-band inter-band combiner of the present application comprises:

[0031] A plurality of inter-sub-band combiners 1, each of which comprises a duplexer 11 and a receiving filter combination 12, each of which comprises a plurality of receiving filters 121;

[0032] Each of the duplexers is configured with a different frequency band;

[0033] The frequency bands of the receiving filters in the receiving filter combination are different, and the frequency bands of the receiving filters include the frequency bands of other duplexers;

[0034] The inter-sub-band combiner is connected to the respective antennas 2, and the duplexer and each of the receiving filters in the inter-sub-band combiner are connected to the antennas.

[0035] In some embodiments, a duplexer generally includes a transmit filter and a receive filter. Therefore, for a multi-band inter-band combiner, the transmit filter in the duplexer can be used to implement transmission, and the receive filter in the duplexer and the receive filter can be used to implement reception.

[0036] Among them, the duplexer connected to the antenna and the receiving filter are equivalent to a parallel relationship. By connecting the receiving filter and the duplexer in parallel, the receiving filter that realizes the inter-band combination does not need to be configured with a new antenna. It shares the antenna with the duplexer, thereby reducing the number of antennas and reducing costs.

[0037] The number of duplexers can be set according to actual needs. The number of frequency bands to be transmitted is consistent with the number of duplexers. For example, if the user needs dual-frequency transmission, two duplexers are set; if five frequency bands are required for transmission, five duplexers are set.

[0038] The number of receiving filters is set according to actual needs. Since there are receiving filters in the duplexer, the number of receiving filters is set to the number of frequency bands to be received minus one. For example, if the user needs to transmit and receive for four frequency bands, four duplexers and three receiving filters are set; if the user needs to transmit and receive for three frequency bands and only needs to receive for one frequency band without transmitting, three duplexers and three receiving filters are set.

[0039] In an optional embodiment, the multi-band inter-band combiner is an inter-band combiner for M frequency bands, the number of the sub-band inter-band combiners is N, each of the receive filter combinations includes M-1 receive filters, and M≥N≥2.

[0040] In some embodiments, since the duplexer includes a transmit filter and a receive filter, and since the transmit filter is not required for some frequency bands, the number of duplexers is less than the number of frequency bands or less than the number of receive filters, that is, M is greater than N. When the transmit and receive requirements are the same, the number of duplexers is the same as the number of frequency bands, that is, M is equal to N.

[0041] In an optional embodiment, when M is greater than N, the frequency band of the receiving filter further includes a frequency band among the M frequency bands that is different from the frequency band of the duplexer.

[0042] In some embodiments, some frequency bands may not need to be transmitted, so the duplexer corresponding to the frequency band may not be set, and the receiving filter of the frequency band can be directly connected in parallel with other duplexers. Thus, the number of receiving filters is greater than the number of duplexers.

[0043] In an optional embodiment, the duplexer is connected to the antenna via a first impedance conversion circuit. The receiving filter is connected to the antenna via a second impedance conversion circuit.

[0044] In some embodiments, since the aggregation requirement is that each frequency band can work simultaneously and the performance needs to be unaffected by each other (or have a small acceptable impact), the frequency band cannot be switched by a switch and the combined device needs to be terminated. However, the duplexer and receiving filter of conventional wireless communication technology will present low impedance in other surrounding frequency bands. If they are terminated directly, they will affect each other. Therefore, impedance transformation circuits can be added at the termination points to transform the impedance to reduce the impact on the combined circuit.

[0045] In an optional embodiment, the first impedance transformation circuit is used to adjust the impedance transformation of the path where the duplexer is located to a target impedance, and the target impedance is greater than a preset impedance.

[0046] In some embodiments, the first impedance transformation circuit can be adjusted from a low impedance region to a high impedance region by the performance of the impedance region of the path where the first impedance transformation circuit is located in the Smith diagram, wherein the impedance of the path is greater than a preset impedance, and the preset impedance is the impedance in the high impedance region.

[0047] In an optional embodiment, the first impedance transformation circuit is an LC impedance transformation network.

[0048] In an optional embodiment, the second impedance transformation circuit is used to adjust the impedance transformation of the path where the receiving filter is located to be greater than a preset impedance.

[0049] In an optional embodiment, the second impedance transformation circuit is an LC impedance transformation network.

[0050] The principle of the second impedance conversion circuit is the same as that of the first impedance conversion circuit, which will not be described in detail here.

[0051] In a specific embodiment, taking a dual-band inter-band combiner as an example, according to the use requirements, in order to realize the combination of Bx and By, that is, 1 uplink + 1 uplink, 2 downlink + 2 downlink, the existing devices can be combined to realize this combination:

[0052] The combination of Bx and By includes 1 uplink + 1 uplink, 2 downlink + 2 downlink. The corresponding filter components are Bx1*Tx (transmit) filter + 2*Rx (receive) filter. Similarly, By 1*Tx filter + 2*Rx filter, so the components can be disassembled into:

[0053] Bx: Duplexer (Duplexer_x (duplexer with frequency band x) includes Tx filtering and Rx filtering) + RxFilter_x (receive filter with frequency band x) of Bx;

[0054] By: Duplexer (Duplexer_y includes Tx filtering and Rx filtering) + By Rx Filter_y (receive filter with frequency band y).

[0055] In order to achieve the aggregation of Bx and By, the antenna allocation is combined as follows:

[0056] Antenna 1 (ANT-1): Duplexer_x+Rx Filter_y, that is, Tx of Bx is allocated on ANT-1, and Rx of Bx and By is allocated on ANT-1;

[0057] Antenna 2 (ANT-2): Duplexer_y+Rx_Filter_x, that is, By's Tx and Bx and By's Rx are allocated on ANT-2.

[0058] join Figure 2 , add an impedance transformation circuit (such as Figure 2 In the impedance transformation circuit A / B / C / D), the implementation principle of each combination circuit is:

[0059] above Figure 3 Take ANT_1 in the figure as an example. Duplexer_x and Filter_Y are terminated together. From the termination point S1, looking toward Duplexer_x, it can be equivalent to impedance ZDx, and looking toward Filter_y, it can be equivalent to impedance ZFy. From this, we can conclude that:

[0060] For the signal transmission from ANT-1 to ZDx, ZFy is equivalent to parallel connection. The smaller the impedance presented by ZFy to ZDx, the greater the impact on ANT-1 to ZDx. The larger the impedance presented, the smaller the impact on ANT-1 to ZDx. Therefore, the function of the impedance transformation circuit B is to adjust the impedance transformation presented by Filter_y to Bx (Duplexer_x) to high impedance.

[0061] For the signal transmission from ANT-1 to ZFy, ZDx is equivalent to parallel connection. The smaller the impedance presented by ZDx to ZFy, the greater the impact on ANT-1 to ZFy. The larger the impedance presented, the smaller the impact on ANT-1 to ZFy. Therefore, the function of impedance transformation circuit A is to adjust the impedance transformation presented by Duplexer_x to By (Filter_y) to high impedance.

[0062] The above is the conventional impedance concept, which is reflected in high frequency and is expressed in the impedance area of ​​the Smith diagram as follows:

[0063] Impedance circuit A adjusts the impedance transformation of the By Rx operating frequency range from S1 to Duplexer_x to a high impedance region (close to the Open point); impedance circuit B adjusts the impedance transformation of the By Rx operating frequency range from S1 to Filter_x to a high impedance region (close to the Open point).

[0064] This type of impedance transformation circuit can be adjusted using conventional LC.

[0065] Specifically, the following uses B3 TRx Duplexer and B7_Rx filter to perform B3+7Rx CA as an example for detailed description:

[0066] join Figure 4 , as shown below, the original impedance of B3 TRx on the left side for the B7 operating frequency is in the low impedance region, such as Figure 5 The original loss of the single B7 Rx path (B3 TRx and B7 are not terminated) is ~1dB. B3TRx and B7 are directly terminated without impedance transformation, such as Figure 6 Compared with B7, the loss becomes ~4.5dB, which is about 3.5dB worse.

[0067] Keep the termination and add LC impedance transformation A at the B3TRx port to adjust the impedance (M1 point) from the low impedance area to Figure 7 High impedance areas such as Figure 8 As shown in Figure 1, the path loss of B7 is about ~1dB, which is much less deteriorated than the independent B7 path loss, and is optimized by 3~3.5dB compared to the circuit without LC impedance transformation. Figure 8This is the curve after adjusting the impedance transformation circuit of B7 and B3 TRx at the same time.

[0068] In summary, the multi-band inter-band combiner of the present application can make full use of the current mainstream mature devices (duplexers and filters) according to the actual use scenario needs, directly connect them through the LC impedance transformation circuit, and move the frequency impedance of each other from the low impedance area to the high impedance area to greatly reduce the influence of each other, so as to achieve two-way simultaneous operation and aggregation. The overall architecture can achieve the balance between the minimum antenna and low cost. The present application takes into account the downlink aggregation capability of dual-bands and the transmission capability of a single band, and can significantly reduce the cost.

[0069] Based on the same concept, an embodiment of the present application provides an antenna device, which includes the multi-band inter-band combiner and the antenna described in the above related embodiments.

[0070] Based on the same concept, an embodiment of the present application provides a terminal, which includes a terminal body and the antenna device described in the above-mentioned related embodiments.

[0071] The terminal may be, but is not limited to, a device that can use an antenna, such as a mobile phone, a tablet computer, a PC, a television, etc.

[0072] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0073] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A multi-band inter-band combiner, characterized in that: include: A plurality of inter-sub-band combiners, each of which comprises a duplexer and a receive filter combination, each of which comprises a plurality of receive filters; Each of the duplexers is configured with a different frequency band; The frequency bands of the receiving filters in the receiving filter combination are different, and the frequency bands of the receiving filters include the frequency bands of other duplexers; The inter-sub-band combiner is connected to respective antennas, and the duplexer and each of the receiving filters in the inter-sub-band combiner are connected to the antennas.

2. The multi-band inter-band combiner according to claim 1, characterized in that: The multi-band inter-band combiner is an inter-band combiner for M frequency bands, the number of the sub-band inter-band combiners is N, each of the receiving filter combinations includes M-1 receiving filters, and M≥N≥2.

3. The multi-band inter-band combiner according to claim 2, characterized in that: When M is greater than N, the frequency band of the receiving filter further includes a frequency band different from the frequency band of the duplexer among the M frequency bands.

4. The multi-band inter-band combiner according to claim 1, characterized in that: The duplexer is connected to the antenna via a first impedance conversion circuit.

5. The multi-band inter-band combiner according to claim 4, characterized in that: The first impedance conversion circuit is used to adjust the impedance conversion of the path where the duplexer is located to a target impedance, and the target impedance is greater than a preset impedance.

6. The multi-band inter-band combiner according to claim 4 or 5, characterized in that: The first impedance transformation circuit is an LC impedance transformation network.

7. The multi-band inter-band combiner according to claim 1, characterized in that: The receiving filter is connected to the antenna via a second impedance conversion circuit.

8. The multi-band inter-band combiner according to claim 7, characterized in that: The second impedance conversion circuit is used to adjust the impedance conversion of the path where the receiving filter is located to be greater than a preset impedance.

9. An antenna device, characterized in that: It comprises the multi-band inter-band combiner and antenna as described in any one of claims 1 to 8.

10. A terminal, characterized in that: A terminal body and the antenna device as claimed in claim 9.

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