CN-122001331-A - Hybrid radio frequency filter

Abstract

A hybrid radio frequency filter comprises a first receiving end, a second receiving end, a first series capacitor, a second series capacitor, a first series resonator and a second series resonator. The first series capacitor, the first series resonator, the second series resonator and the second series capacitor are sequentially coupled in series between the first receiving end and the second receiving end.

Inventors

• LIN SHIMENG
• YE YOUFENG

Assignees

• 立积电子股份有限公司

Dates

Publication Date

20260508

Application Date

20241121

Priority Date

20241108

Claims (17)

1. 1. A hybrid radio frequency filter, comprising: A first transceiver; a second transceiver; A first series capacitor; a second series capacitor; a first series resonator A second series resonator; the first series capacitor, the first series resonator, the second series resonator and the second series capacitor are sequentially coupled in series between the first receiving end and the second receiving end.
2. 2. The hybrid radio frequency filter of claim 1, further comprising: a first matching circuit comprising: A first end coupled to the first transceiver end, and A second end coupled to the first series capacitor, and A second matching circuit comprising: a first end coupled to the second series capacitor, and The second end is coupled to the second receiving and transmitting end.
3. 3. The hybrid radio frequency filter of claim 2, wherein the filter is configured to filter the signal from the antenna, The first series capacitor is directly coupled to the second end of the first matching circuit.
4. 4. The hybrid radio frequency filter of claim 2, wherein the filter is configured to filter the signal from the antenna, The second series capacitor is directly coupled to the first end of the second matching circuit.
5. 5. The hybrid rf filter of claim 1 wherein the first series capacitor has the same capacitance as the second series capacitor.
6. 6. The hybrid rf filter of claim 1, wherein the equivalent capacitance of the first series resonator and the second series resonator are the same.
7. 7. The hybrid radio frequency filter of claim 1, further comprising: A third series capacitor comprising: a first end coupled to the first series resonator, and A second end A fourth series capacitor comprising: A first end coupled to the second end of the third series capacitor, and A second end coupled to the second series resonator; wherein the capacitance of the third series capacitor is substantially the same as the capacitance of the fourth series capacitor.
8. 8. The hybrid radio frequency filter of claim 7, further comprising: at least one first parallel resonator comprising: a first end coupled between the first series capacitor and the first series resonator, and A second end coupled to a first node, and At least one second parallel resonator comprising: A first end coupled between the second series resonator and the second series capacitor, and A second end coupled to a second node.
9. 9. The hybrid radio frequency filter of claim 8, wherein the filter is configured to filter the signal from the antenna, The at least one first parallel resonator comprises a plurality of resonators connected in series, and The at least one second parallel resonator comprises a plurality of resonators connected in series.
10. 10. The hybrid radio frequency filter of claim 8, further comprising: A first parallel capacitor, comprising: a first end coupled between the first series resonator and the third series capacitor, and A second end coupled to a third node, and A second parallel capacitor, comprising: A first end coupled between the fourth series capacitor and the second series resonator, and A second end coupled to a fourth node.
11. 11. The hybrid radio frequency filter of claim 10, further comprising: a third parallel resonator comprising: a first end coupled between the third and fourth series capacitors, and A second end coupled to a fifth node.
12. 12. The hybrid radio frequency filter of claim 7, further comprising: at least one first parallel capacitor comprising: a first end coupled between the first series capacitor and the first series resonator, and A second end coupled to a first node, and At least one second parallel capacitor comprising: A first end coupled between the second series resonator and the second series capacitor, and A second end coupled to a second node.
13. 13. The hybrid radio frequency filter of claim 12, further comprising: a first parallel resonator comprising: a first end coupled between the first series resonator and the third series capacitor, and A second end coupled to a third node, and A second parallel resonator comprising: A first end coupled between the fourth series capacitor and the second series resonator, and A second end coupled to a fourth node.
14. 14. The hybrid radio frequency filter of claim 13, further comprising: A third parallel capacitor, comprising: a first end coupled between the third and fourth series capacitors, and A second end coupled to a fifth node.
15. 15. The hybrid RF filter of claim 11 or 14, wherein the first node, the second node, the third node, the fourth node, and the fifth node are each coupled to a reference voltage terminal via an inductor, or At least two of the first node, the second node, the third node, the fourth node and the fifth node are coupled to a reference voltage terminal through a common inductor.
16. 16. The hybrid rf filter of claim 15 wherein the reference voltage terminal is a ground terminal.
17. 17. The hybrid rf filter of claim 13, wherein the first series resonator, the first parallel resonator, the second series resonator, and the second parallel resonator are each a thin film bulk acoustic resonator.

Description

Hybrid radio frequency filter Technical Field The present invention relates to a hybrid radio frequency filter, and more particularly to a hybrid radio frequency filter including a series capacitor and a series resonator. Background With the development of communication technology, the frequency bands supported by mobile phones, wireless communication devices and other products are increasing, so as to increase the signal coverage capability and international roaming capability. With the rapid popularity of wireless devices, there is an increasing demand for small and lightweight resonators and filters therefor. Acoustic wave devices, such as surface acoustic wave (surface acoustic wave, SAW) devices, bulk acoustic wave (bulk acoustic wave, or body acoustic wave, BAW) devices, and the like, are widely used for the conversion and transfer of electrical and acoustic signals. Acoustic wave devices have many uses. For example, the acoustic wave device can be used as a filter to filter noise and leave wireless signals in a specific frequency band, and has the characteristics of small transmission loss, good electromagnetic interference resistance and small volume, so that the acoustic wave device is widely applied to various communication products. In addition, the acoustic wave device can also be used for a resonator (also called a resonator), a transformer, a sensor, and the like. For example, the radio frequency filter may include a series resonator and a parallel resonator to form a ladder-type filter. A film bulk acoustic resonator (Film Bulk Acoustic Resonator; FBAR) may be used to achieve better characteristics, such as quality factor, at high frequencies. Furthermore, for example, in some Wi-Fi applications, it may be desirable for the RF filter to have better characteristics over a wider frequency band (e.g., 5.945GHz-7.125 GHz), but using only series or parallel FBARs on the circuit may not meet the above requirements. Therefore, a hybrid rf filter is needed to achieve both higher frequency and wider band characteristics. Disclosure of Invention An embodiment of the invention provides a hybrid radio frequency filter. The hybrid radio frequency filter may include a first transceiver, a second transceiver, a first series capacitor, a second series capacitor, a first series resonator, and a second series resonator. The first series capacitor, the first series resonator, the second series resonator and the second series capacitor can be serially coupled between the first transceiver and the second transceiver in sequence. Drawings Fig. 1 is a circuit diagram of a hybrid rf filter according to an embodiment of the invention. Fig. 2 is a circuit diagram of a hybrid rf filter according to another embodiment of the present invention. Symbol description: 10. 20-hybrid radio frequency filter TR 1-TR 2 transceiver 12. 22 First matching circuit 14. 24 Second matching circuit CS 1-CS 4 series capacitor RP 1-RP 3 parallel resonator N1-N5 node RS 1-RS 2 series resonator CP 1-CP 3 parallel capacitor L1 shaft Detailed Description The present invention may be understood by reference to the following detailed description taken in conjunction with the accompanying drawings, wherein, for the sake of easy understanding of the reader and brevity of the drawings, specific elements of the invention are depicted only in a portion of an electronic device and are not drawn to actual scale. In addition, the number and size of the elements in the drawings are illustrative only and are not intended to limit the scope of the invention. Elements labeled with the same reference numbers in the figures have the same or similar properties or functions in the context. It is to be understood that the following exemplary embodiments may be substituted, rearranged, and mixed for the features of several different embodiments without departing from the spirit of the invention to accomplish other embodiments. Features of the embodiments may be used singly or in combination without departing from the spirit or conflict of the invention. In the following description and in the claims, the terms "include," have, "and the like are open-ended terms, and thus should be interpreted to mean" include, but not limited to. Thus, when the terms "comprises," "comprising," and/or "having" are used in the description of the present invention, they specify the presence of the corresponding features, regions, steps, operations, and/or components, but do not exclude the presence of one or more corresponding features, regions, steps, operations, and/or components. Fig. 1 is a circuit diagram of a hybrid rf filter 10 according to an embodiment of the invention. As shown, in some embodiments, the hybrid rf filter 10 may include a first transceiver TR1 and a second transceiver TR2. The first transceiver TR1 may be configured to receive an input rf signal, and the second transceiver TR2 may be configured to transmit an output rf signal. The radio frequency signal is t