Duplexer, radio frequency module, and electronic device

Abstract

The application discloses a duplexer, a radio frequency module and an electronic device. The duplexer comprises: a first side and a second side parallel to each other in a first direction; one end of the first side is provided with a transmitting end, and the other end of the first side is provided with a receiving end; an antenna end is arranged between the two ends of the second side, and the antenna end is connected with an antenna connecting line extending to the first side; one side of the antenna connecting line towards the receiving end is a first area, and the other side of the antenna connecting line towards the transmitting end is a second area; a plurality of resonators are arranged in the first area and the second area; in the first area, the resonators are connected into a receiving filter based on a first connecting line; in the second area, the resonators are connected into a transmitting filter based on a second connecting line; in the first direction, a first resonator connected with the receiving end has a first distance from the antenna end; a first resonator connected with the transmitting end has a second distance from the antenna end; and at least one of the first distance and the second distance is greater than 200 mu m.

Description

Technical Field

[0001] This application relates to the field of wireless communication equipment technology, and more specifically, to a duplexer, a radio frequency module, and an electronic device. Background Technology

[0002] Surface acoustic wave (SAW) resonators are widely used devices in the radio frequency (RF) field. They combine low insertion loss and good suppression performance with a small size, primarily utilizing the piezoelectric effect to convert electrical energy into and out of mechanical energy. SAW resonators can be used in combination to achieve gating characteristics for signal transmission.

[0003] Multiple surface acoustic wave resonators (SAWs) can be interconnected to form filters, which can then be used to construct duplexers. In existing duplexers, the isolation between the transmitting and receiving filters is poor. Improving the isolation between the transmitting and receiving filters in a duplexer is a pressing problem in the field of wireless communication equipment. Utility Model Content

[0004] In view of the above problems, this application provides a duplexer, an RF module, and an electronic device to improve the isolation between the transmit filter and the receive filter in the duplexer. The specific solution is as follows:

[0005] The first aspect of this application provides a duplexer, comprising:

[0006] A first side and a second side are parallel to each other in a first direction; a transmitting end is provided at one end of the first side and a receiving end is provided at the other end of the first side; an antenna end is provided between the two ends of the second side, and an antenna connecting line extending to the first side is connected to the antenna end; the side of the antenna connecting line facing the receiving end is the first region, and the side of the antenna connecting line facing the transmitting end is the second region; multiple resonators are provided in both the first region and the second region.

[0007] In the first region, the resonators are connected based on the first connecting line to form a receiving filter connected between the receiving end and the antenna end;

[0008] In the second region, the resonators are connected based on the second connecting line to form a transmit filter connected between the transmitter and the antenna.

[0009] In the first direction, the first resonator connected to the receiving end has a first distance from the antenna end; the first resonator connected to the transmitting end has a second distance from the antenna end; at least one of the first distance and the second distance is greater than 200 μm.

[0010] Optionally, the first distance can be set to be greater than 200 μm and the second distance to be less than 200 μm; or, the first distance can be less than 200 μm and the second distance can be greater than 200 μm; or, the first distance can be greater than 200 μm and the second distance can be greater than 200 μm.

[0011] Optionally, in the above duplexer, at least the first distance is greater than 200 μm.

[0012] Optionally, in the duplexer described above, both the first distance and the second distance are greater than 200 μm.

[0013] Optionally, in the above duplexer, the first distance is greater than the second distance.

[0014] Optionally, in the above duplexer, the first distance is 270μm~390μm.

[0015] Optionally, in the above duplexer, the second distance is 380μm~500μm.

[0016] Optionally, in the duplexer described above, the portion of the antenna connection line located between the antenna end and the resonator connected to the antenna end can be a non-linear structure, such as a broken line or a curve, to increase the length of this portion of the antenna connection line. This increases the distance between the antenna end and the transmitting filter and the receiving filter, thereby increasing the current path from the antenna end to the transmitting filter and the receiving filter, further improving the isolation between the receiving filter and the transmitting filter, and enhancing the isolation performance of the duplexer.

[0017] Optionally, in the duplexer described above, for the multiple resonators located in the second region, there are multiple series resonators connected in series between the transmitting end and the antenna end, and a grounded parallel resonator is connected between adjacent series resonators.

[0018] At least one parallel resonator includes two parallel sub-resonators, with different finger spacings on the interdigitated electrodes of the two resonators.

[0019] Optionally, in the duplexer described above, in the transmit filter, at least the parallel resonator closest to the antenna end includes two parallel sub-resonators.

[0020] A second aspect of this application provides a radio frequency module including a duplexer as described above.

[0021] A third aspect of this application provides an electronic device including the aforementioned radio frequency module.

[0022] By employing the above-mentioned technical solutions, in the duplexer, RF module, and electronic equipment, at least one of the first distance and the second distance is greater than 200μm, which ensures that there is a sufficient distance between the first resonator connected to the receiver and the antenna end to reduce interference from the receiver to the antenna end, and / or a sufficient distance between the first resonator connected to the transmitter and the antenna end to reduce interference from the transmitter to the antenna end. This effectively improves the isolation between the transmitting filter and the receiving filter in the duplexer, and effectively enhances the isolation performance of the duplexer. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0025] Figure 1 An equivalent circuit diagram of a duplexer provided in an embodiment of this application;

[0026] Figure 2 for Figure 1 A schematic diagram showing the layout of each resonator and terminal in the duplexer.

[0027] Figure 3 Isolation curves of duplexers in some embodiments provided in this application;

[0028] Figure 4 Isolation curves of duplexers provided in other embodiments of this application;

[0029] Figure 5 Isolation curves of duplexers in some other embodiments provided in this application.

[0030] Figure label:

[0031] 100 - Resonator; 101 - First side; 102 - Second side; 103 - Antenna connection line; 104 - Longitudinal coupling filter; 105 - First connection line; 106 - Transmit filter; 107 - Second connection line; 108 - Receive filter; 109 - First curve; 110 - Second curve; 111 - Third curve; 112 - Fourth curve; 113 - Sixth curve; 114 - Fifth curve; Y - First direction; X - Second direction; TX - Transmitter; RX - Receiver; GND - Ground; ANT - Antenna; D1 - First distance; D2 - Second distance. Detailed Implementation

[0032] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0033] A duplexer is one of the most important components in an RF module. A duplexer consists of two sets of bandpass filters at different frequencies: a transmit filter and a receive filter. The main performance parameters of a duplexer include insertion loss, VSWR (Standing Wave Ratio), and isolation. Isolation refers to the signal attenuation from the transmitter to the receiver; essentially, it's the energy leakage control capability between the two bandpass filters. Isolation is usually expressed in decibels (dB). Insufficient isolation will directly lead to degraded communication quality, equipment damage, or even system failure. Therefore, isolation is a performance parameter that must be prioritized for optimization in duplexer design. However, the isolation between the transmit and receive filters in conventional duplexers is relatively poor.

[0034] The inventors discovered that in a duplexer, the signals from the transmitting and receiving ends and the antenna end interfere with each other due to mutual current inductance, which leads to a decrease in isolation performance. This problem can be solved by placing the first resonators connected to the transmitting and receiving ends in the duplexer as far away from the antenna end as possible. This can effectively reduce the interference between the transmitting and receiving ends and the antenna end, thereby effectively improving the isolation performance of the duplexer.

[0035] In view of this, embodiments of this application provide a duplexer, which includes:

[0036] A first side and a second side are parallel to each other in a first direction; a transmitting end is provided at one end of the first side and a receiving end is provided at the other end of the first side; an antenna end is provided between the two ends of the second side, and an antenna connecting line extending to the first side is connected to the antenna end; the side of the antenna connecting line facing the receiving end is the first region, and the side of the antenna connecting line facing the transmitting end is the second region; multiple resonators are provided in both the first region and the second region.

[0037] In the first region, the resonators are connected based on the first connecting line to form a receiving filter connected between the receiving end and the antenna end;

[0038] In the second region, the resonators are connected based on the second connecting line to form a transmit filter connected between the transmitter and the antenna.

[0039] In the first direction, the first resonator connected to the receiving end has a first distance from the antenna end; the first resonator connected to the transmitting end has a second distance from the antenna end; at least one of the first distance and the second distance is greater than 200 μm.

[0040] In the duplexer provided in this application embodiment, at least one of the first distance and the second distance is greater than 200 μm, which can ensure that there is a sufficient distance between the first resonator connected to the receiving end and the antenna end to reduce the interference of the receiving end to the antenna end, and / or there is a sufficient distance between the first resonator connected to the transmitting end and the antenna end to reduce the interference of the transmitting end to the antenna end. This can effectively improve the isolation between the transmitting filter and the receiving filter in the duplexer, and effectively improve the isolation performance of the duplexer.

[0041] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] refer to Figure 1 and Figure 2 , Figure 1 An equivalent circuit diagram of a duplexer provided in this application embodiment is shown. Figure 2 for Figure 1 The diagram shows the layout of each resonator and terminal in the duplexer.

[0043] like Figure 1 and Figure 2 As shown, the duplexer includes: a first side 101 and a second side 102 parallel to each other in the first direction Y, both the first side 101 and the second side 102 being parallel to the second direction X, and the first direction Y and the second direction X being perpendicular; a transmitting end TX is provided at one end of the first side 101, and a receiving end RX is provided at the other end of the first side 101; an antenna end ANT is provided between the two ends of the second side 102, and the antenna end ANT is connected to an antenna connecting line 103 extending to the first side 101; the side of the antenna connecting line 103 facing the receiving end RX is a first region, and the side of the antenna connecting line facing the transmitting end TX is a second region; multiple resonators 100 are provided in both the first region and the second region. Figure 2In the illustration, the left side of the antenna connection line 103 is the first region, and the right side of the antenna connection line 103 is the second region.

[0044] In the first region, each resonator 100 is connected based on the first connection line 105 to form a receiver filter 108 connected between the receiver RX and the antenna ANT; in the second region, each resonator 100 is connected based on the second connection line 107 to form a transmitter filter 106 connected between the transmitter TX and the antenna ANT.

[0045] In the first direction Y, the first resonator 100 connected to the receiver RX has a first distance D1 with the antenna ANT; the first resonator 100 connected to the transmitter TX has a second distance D2 with the antenna ANT; at least one of the first distance and the second distance D2 is greater than 200μm.

[0046] In the duplexer provided in this application embodiment, at least one of the first distance D1 and the second distance D2 is greater than 200μm, which can ensure that there is a sufficient distance between the first resonator 100 connected to the receiving end RX and the antenna end ANT to reduce the interference of the receiving end RX to the antenna end ANT, and / or there is a sufficient distance between the first resonator 100 connected to the transmitting end TX and the antenna end ANT to reduce the interference of the transmitting end TX to the antenna end ANT. This can effectively improve the isolation between the transmitting filter 106 and the receiving filter 108 in the duplexer, and effectively improve the isolation performance of the duplexer.

[0047] Optionally, the functional area of ​​the duplexer used to position the resonator 100 can be rectangular (e.g., Figure 2 (As shown in the dashed box in the middle), all resonators 100 in the duplexer are located within this rectangular area. The first side 101 and the second side 102 are the two long sides of the rectangle. In this way, the transmitter TX and the receiver RX are located at one end of the same long side, thereby maximizing the distance between the transmitter TX and the receiver RX, reducing mutual interference between the transmitter TX and the receiver RX, and achieving maximum isolation between the transmitter TX and the receiver RX.

[0048] In addition, the antenna end ANT can be located between the two ends of the other long side, which makes it easier for the antenna end ANT to be connected to the first and second regions on the left and right sides respectively. This allows for a more uniform wiring pattern for both the transmitting filter 106 and the receiving filter 108, which helps to stabilize the signal transmission inside each filter and reduce radio frequency loss and distortion.

[0049] In some embodiments of this application, at least the first distance D1 is greater than 200 μm. In actual products, the resonator 100 in the receiving filter 108 causes greater interference to the antenna ANT, that is, the receiving end RX causes greater interference to the antenna ANT than the transmitting end TX. In this way, the first resonator 100 connected to the receiving end RX can be kept at a sufficient distance from the antenna ANT to reduce the interference of the receiving end RX to the antenna ANT.

[0050] In some embodiments of this application, the first distance D1 and the second distance D2 are both greater than 200 μm. This method ensures sufficient distance between the first resonator 100 connected to the receiver RX and the antenna ANT to reduce interference from the receiver RX to the antenna ANT. It also ensures sufficient distance between the first resonator 100 connected to the transmitter TX and the antenna ANT to reduce interference from the transmitter TX to the antenna ANT.

[0051] Optionally, as mentioned above, the interference from the receiver RX to the antenna ANT is greater than that from the transmitter TX. When both the first distance D1 and the second distance D2 are greater than 200μm, the first distance D1 can be set to be greater than the second distance D2 so that the receiver RX and the antenna ANT have a better isolation effect.

[0052] It should be noted that, depending on the usage requirements, either the first distance D1 or the second distance D2, or both, can be set to be greater than 200μm, and is not limited to the description above.

[0053] In some embodiments of this application, the first distance D1 is 270μm to 390μm. Optionally, the first distance D1 can be 330μm. Within the numerical range provided by this embodiment, the interference of the receiver RX to the antenna ANT can be effectively reduced, while also avoiding the first distance D1 being too large and affecting the size of the duplexer.

[0054] In some embodiments of this application, the second distance D2 is 380μm to 500μm. Optionally, the second distance D2 can be 440μm. Within the numerical range provided by this embodiment, the interference of the transmitting end TX to the antenna end ANT can be effectively reduced, while also avoiding the second distance D2 being too large and affecting the size of the duplexer.

[0055] like Figure 1 As shown, the transmit filter 106 includes multiple resonators 100 connected between the antenna end ANT and the transmit end TX. The receive filter 108 includes multiple resonators 100 connected between the antenna end ANT and the receive end RX.

[0056] In some embodiments of this application, for a plurality of resonators 100 located in the second region, the plurality of resonators 100 includes: a plurality of series resonators connected in series between the transmitting end TX and the antenna end ANT, and a grounded parallel resonator connected between adjacent series resonators; wherein at least one parallel resonator includes two parallel sub-resonators, and the interdigitated electrodes of the two resonators have different finger spacing. Figure 1 and Figure 2 As shown, in the transmit filter 106, seven resonators 100 are connected between the transmitter (TX) and the antenna (ANT). Four of these resonators 100, connected sequentially to the transmitter (TX) and antenna (ANT), are series resonators, denoted as TS1, TS2, TS3, and TS4, respectively. The other three resonators 100 are parallel resonators, denoted as TP1, TP2, and TP2, respectively. Adjacent series resonators are grounded through a parallel resonator.

[0057] In the transmitting filter 106, at least one parallel resonator is provided, including two parallel sub-resonators. The finger spacing of the interdigitated electrodes in the two resonators is different. By differentiating the finger spacing of the interdigitated electrodes of the two sub-resonators in the parallel resonator, the isolation between the transmitting filter 106 and the receiving filter 108 can be improved, and the isolation of the duplexer can be further improved.

[0058] In some embodiments of this application, in the transmit filter 106, at least the parallel resonator closest to the antenna end ANT includes two parallel sub-resonators, such as... Figure 1 and Figure 2 As shown, the parallel resonator TP1 is split into two parallel sub-resonators, denoted as TP11 and TP12, respectively. In the transmit filter 106, the first parallel resonator closest to the antenna ANT causes significant interference to the receive filter. Splitting this parallel resonator into two parallel sub-resonators can significantly improve the isolation between the transmit filter 106 and the receive filter 108.

[0059] like Figure 1 and Figure 2 As shown, in the first region, the receiving filter 108 includes a longitudinal coupling filter 104. The longitudinal coupling filter 104 allows the receiving filter 108 to utilize its low insertion loss, steep transition band, and optimal passband flatness to match the receiver's performance requirements for high sensitivity to weak signals and strong interference suppression.

[0060] Optionally, the longitudinal coupling filter 104 is connected to the antenna terminal ANT via a series resonator RS1. The two ends of the longitudinal coupling filter 104 are also connected to grounded parallel resonators RP1 and RP2, respectively.

[0061] In some embodiments of this application, such as Figure 1 As shown, the duplexer also includes a first resistor R1 connected between the transmitter TX and the transmit filter 106. Based on the first resistor R1, impedance matching can be improved, transmission efficiency can be increased, receiver interference can be isolated, power protection devices can be controlled, and the high-efficiency operation and long-term reliability of the transmitter can be guaranteed.

[0062] In some embodiments of this application, such as Figure 1 As shown, the second resistor R2 is connected between the receiver RX and the receiver filter 108. Based on the second resistor R2, impedance matching can be improved, reflection loss reduced, strong interference signals attenuated, passband flatness optimized, and high sensitivity and low noise of the receiver ensured.

[0063] In some embodiments of this application, such as Figure 1 As shown, the portion of the second connecting line 107 located between the antenna end ANT and the connected resonator 100 (i.e., the second connecting line 107 at one end between the antenna end ANT and TS1) can be as follows: Figure 1 The straight structure shown facilitates the fabrication of the second connecting line 107.

[0064] In other methods, when there is sufficient wiring space in the duplexer, the portion of the antenna connection line 103 between the antenna end ANT and the resonator 100 connected to the antenna end ANT can also be a non-linear structure, such as a broken line or a curve. This can increase the distance between the antenna end ANT and the two filters, and increase the transmission path of interference signals in the receiving filter 108 and the transmitting filter 106 to the antenna end ANT, thereby further improving the isolation between the receiving filter 108 and the transmitting filter 106, and further improving the isolation performance of the duplexer.

[0065] Both the transmitting filter 106 and the receiving filter 108 include grounded parallel resonators, which are grounded based on their respective connected ground terminals GND. Optionally, ground terminals GND are provided on both the first side 101 and the second side. This allows the parallel resonators in the transmitting filter 106 and the receiving filter 108 to be grounded through the ground terminals GND located on their respective sides, facilitating the grounding wiring of the parallel resonators in the first and second regions. Moreover, this method allows for a more reasonable arrangement of the receiving end RX, transmitting end TX, antenna end ANT, and ground terminal of the duplexer on the first side 101 and the second side 102, which not only facilitates the circuit interconnection between the resonators 100 in the duplexer but also improves isolation performance.

[0066] refer to Figure 3 , Figure 3Isolation curves of duplexers in some embodiments provided in this application. Figure 3 In the diagram, the horizontal axis represents frequency in MHz, and the vertical axis represents isolation in dB. The first curve 109 is the isolation curve of a conventional duplexer, and the second curve 110 is the isolation curve of the duplexer provided in this embodiment when both the first distance D1 and the second distance D2 are greater than 20 μm.

[0067] Figure 3 In the diagram, at position m2 with a frequency of 718 MHz, the isolation of the first curve 109 and the second curve 110 are -65.483 dB and -66.241 dB, respectively; at position m1 with a frequency of 748 MHz, the isolation of the first curve 109 and the second curve 110 are -65.135 dB and -65.156 dB, respectively; at position m12 with a frequency of 773 MHz, the isolation of the first curve 109 and the second curve 110 are -57.773 dB and -58.123 dB, respectively; and at position m3 with a frequency of 803 MHz, the isolation of the first curve 109 and the second curve 110 are -56.594 dB and -57.776 dB, respectively.

[0068] based on Figure 3 It can be seen that, compared to the first curve 109, the isolation of the second curve 110 can be improved to more than 2dB. Among them, the frequency range from m2 to m1 is the passband of the transmitting filter 106, and m12 to m3 is the passband of the receiving filter 108. The region where the isolation is improved to more than 2dB is located within the passband of the two filters.

[0069] Simulation data show that by increasing the first distance and / or the second distance to 200 μm or more, the isolation between the transmitting filter 106 and the receiving filter 108 in the duplexer can be effectively improved, thus enhancing the isolation performance of the duplexer.

[0070] In a conventional duplexer, the distance between the first resonator 100 connected to the receiver RX and the antenna ANT in the first direction Y is generally about 200μm, that is, the first distance D1 is 200μm. In this embodiment, the first distance D1 can be increased to 330μm. Compared with the conventional duplexer, the first distance D1 can be increased by 120μm to 180μm in this embodiment.

[0071] In a conventional duplexer, the distance between the first resonator 100 connected to the transmitter TX and the antenna ANT in the first direction Y is generally about 190 μm, that is, the second distance D2 is 190 μm. In the embodiment of this application, the second distance D2 can be increased to about 440 μm. Compared with the conventional duplexer, the embodiment of this application can increase the second distance D2 by 220 μm to 280 μm.

[0072] In this embodiment, the distance between at least one of the first resonator 100 connected to the receiver RX and the first resonator 100 connected to the transmitter TX and the antenna ANT can be increased. That is, either the first distance D1 and the second distance D2 can be increased to 200μm or more, or both the first distance D1 and the second distance D2 can be increased to 200μm or more, so as to improve the isolation between the transmitter filter 106 and the receiver filter 108 in the duplexer.

[0073] refer to Figure 4 , Figure 4 Isolation curves of duplexers in other embodiments provided in this application. Figure 4 In the graph, the horizontal axis represents frequency in MHz, and the vertical axis represents isolation in dB. Curve 111 shows the isolation when both the first distance D1 and the second distance D2 increase to over 200 μm. Curve 112 shows the isolation when only the second distance D2 increases to over 200 μm, at which point the first distance D1 is less than 200 μm.

[0074] Figure 4 In the diagram, at position m2 with a frequency of 718 MHz, the isolation of the third curve 111 and the fourth curve 112 are -66.241 dB and -64.702 dB, respectively; at position m1 with a frequency of 748 MHz, the isolation of the third curve 111 and the fourth curve 112 are -65.156 dB and -63.803 dB, respectively; at position m12 with a frequency of 773 MHz, the isolation of the third curve 111 and the fourth curve 112 are -58.123 dB and -58.352 dB, respectively; and at position m3 with a frequency of 803 MHz, the isolation of the third curve 111 and the fourth curve 112 are -57.776 dB and -57.385 dB, respectively.

[0075] based on Figure 4 It can be seen that the isolation performance of the fourth curve 112 in the m2-m1 frequency band is significantly better than that of the third curve 111. This indicates that if the position of the first resonator 100 connected to the receiver RX remains unchanged, simply moving the first resonator 100 connected to the transmitter TX to increase its distance from the antenna ANT can also significantly improve the isolation performance of the duplexer.

[0076] refer to Figure 5 , Figure 5 Isolation curves of duplexers in some other embodiments provided in this application. Figure 5In the graph, the horizontal axis represents frequency in MHz, and the vertical axis represents isolation in dB. Curve 114 (the fifth curve) shows the isolation when both the first distance D1 and the second distance D2 increase to over 200 μm. Curve 113 (the sixth curve) shows the isolation when only the first distance D1 increases to over 200 μm, at which point the second distance D2 is less than 200 μm.

[0077] based on Figure 5 It can be seen that the isolation performance of the fifth curve 114 in the m12-m3 frequency band is significantly better than that of the sixth curve 113. This indicates that if the position of the first resonator 100 connected to the transmitter TX remains unchanged, simply moving the first resonator 100 connected to the receiver RX to increase its distance from the antenna ANT can also significantly improve the isolation performance of the duplexer.

[0078] Based on the duplexer provided in the above embodiments, another embodiment of this application also provides a radio frequency module, which includes the duplexer provided in any of the above embodiments.

[0079] The RF module provided in this application uses the duplexer provided in the above embodiment. By optimizing the distance between the first resonator 100 connected to the receiver RX and the antenna ANT and / or the distance between the first resonator 100 connected to the transmitter TX and the antenna ANT, the isolation between the transmit filter 106 and the receive filter 108 can be improved, thereby improving the isolation performance of the duplexer.

[0080] Based on the above embodiments, another embodiment of this application also provides an electronic device, which includes the above-described radio frequency module.

[0081] Optionally, the electronic device can be a wireless communication device such as a smartphone, a satellite communication device, or a radar system. This application does not limit the type of electronic device and it can be any electronic device with a radio frequency module.

[0082] The electronic device provided in this application uses the above-mentioned radio frequency module. By optimizing the distance between the first resonator 100 connected to the receiver RX and the antenna ANT and / or the distance between the first resonator 100 connected to the transmitter TX and the antenna ANT, at least one of the first distance D1 and the second distance D2 is not less than 200μm. This can improve the isolation between the transmitter filter 106 and the receiver filter 108, thereby improving the isolation performance of the duplexer and ultimately enhancing the performance of the electronic device.

[0083] The various embodiments in this application are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. The embodiments provided in this application can be combined with each other without contradiction.

[0084] It should be noted that, in the description of this application, the accompanying drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the embodiments identify the same structures. Additionally, for ease of understanding and description, the thicknesses of some layers, films, panels, regions, etc., may be exaggerated in the drawings. It is also understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element may be directly on the other element or there may be intermediate elements. Furthermore, "on" means positioning an element on or below another element, but does not inherently mean positioning it above another element according to the direction of gravity.

[0085] The terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the middle.

[0086] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A duplexer, characterized in that, include: The first and second sides are parallel and opposite to each other in the first direction; A transmitting end is provided at one end of the first side, and a receiving end is provided at the other end of the first side; an antenna end is provided between the two ends of the second side, and an antenna connecting line extending to the first side is connected to the antenna end; the side of the antenna connecting line facing the receiving end is a first region, and the side of the antenna connecting line facing the transmitting end is a second region; multiple resonators are provided in both the first region and the second region. In the first region, each of the resonators is connected based on a first connection line to form a receiving filter connected between the receiving end and the antenna end; In the second region, each of the resonators is connected based on a second connecting line to form a transmission filter connected between the transmitting end and the antenna end; In the first direction, the first resonator connected to the receiving end has a first distance from the antenna end; the first resonator connected to the transmitting end has a second distance from the antenna end; at least one of the first distance and the second distance is greater than 200 μm.

2. The duplexer according to claim 1, characterized in that, At least the first distance is greater than 200 μm.

3. The duplexer according to claim 2, characterized in that, Both the first distance and the second distance are greater than 200 μm.

4. The duplexer according to claim 3, characterized in that, The first distance is greater than the second distance.

5. The duplexer according to claim 3, characterized in that, The first distance is 270μm~390μm.

6. The duplexer according to claim 3, characterized in that, The second distance is 380μm~500μm.

7. The duplexer according to any one of claims 1-6, characterized in that, For the plurality of resonators located in the second region, the resonators include: a plurality of series resonators connected in series between the transmitting end and the antenna end, and a grounded parallel resonator connected between adjacent series resonators; At least one of the parallel resonators comprises two parallel sub-resonators, wherein the interdigitated electrodes of the two resonators have different finger spacing.

8. The duplexer according to claim 7, characterized in that, In the transmit filter, at least the parallel resonator closest to the antenna end comprises two parallel sub-resonators.

9. A radio frequency module, characterized in that, Includes the duplexer as described in any one of claims 1-8.

10. An electronic device, characterized in that, Includes the radio frequency module as described in claim 9.

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