High-performance duplexer based on SAW and BAW
A duplexer, high-performance technology, applied in the direction of electrical components, impedance networks, etc., can solve the problems of large volume and difficult to meet the demand of chip components
Pending Publication Date: 2020-07-31
XWAVE TECH (SHANGHAI) CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the existing duplexer needs to adopt a higher-level filter comprehensive design to achieve high out-of-band suppression and high stability, which will lead to excessive volume, and at the same time, the existing chip components of specifications It is also difficult to meet the needs of the problem
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Embodiment 1
[0030] Refer to attached figure 1 , a high-performance duplexer based on SAW and BAW in this embodiment, including the first filter for filtering the transmitted radio frequency signal, that is, the bulk acoustic wave filter BAW and the second filter for receiving and filtering the radio frequency signal That is, the surface acoustic wave filter SAW;
[0031] The first filter includes an S1 resonator, an S2 resonator, an S3 resonator, an S4 resonator, and an RA1 resonator connected in series in sequence, a P1 resonator and a P2 resonator are connected in parallel at both ends of the S1 resonator, and the S3 resonator A P3 resonator and a P4 resonator are connected in parallel at both ends of the resonator, and an RA2 resonator is connected in parallel between the S4 resonator and the RA1 resonator;
[0032] The second filter includes a B1 resonator, a B3 resonator, a B5 resonator, a B7 resonator and a B9 resonator connected in series in sequence, and the second filter also in...
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The invention discloses a high-performance duplexer based on SAW and BAW, and belongs to the technical field of duplexers. A first filter, namely a bulk acoustic wave filter BAW, is used for filteringtransmitted radio frequency signals, and a second filter, namely a surface acoustic wave filter SAW, is used for receiving the radio frequency signals and filtering the radio frequency signals; by using the SAW resonator at the last stage of the first filter, deterioration of secondary distortion and harmonic characteristics can be suppressed. In addition, by incorporating the SAW resonator of the first filter in series with the SAW resonator of the second filter in the same SAW chip, antenna matching can be improved relative to other duplexers. Meanwhile, a loop is configured to generate aninverted signal with a target signal at a specific frequency to suppress the target signal, so that the stability and high out-of-band rejection of the duplexer are improved, and the size of the duplexer is reduced.
Description
technical field [0001] The invention belongs to the technical field of duplexers, in particular to a high-performance duplexer based on SAW and BAW. Background technique [0002] Acoustic filters are widely used in radio frequency electronic systems. For example, the filters in the RF front-end of a mobile phone typically include an acoustic filter, and two acoustic filters can be combined to form a duplexer. The general duplexer is composed of a spiral vibrating cavity. Because of its high operating frequency and great influence on the distribution parameters, it is often made into a sealed sleeve. Each signal feeder uses a coaxial cable with better shielding effect, and the shape of the cavity is also A certain degree of finish is required. In many LC duplexer circuit applications, it is necessary to adopt a higher-level filter comprehensive design to meet the design requirements. As the design level of the filter becomes higher and higher, the precision requirements for...
Claims
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Login to View More IPC IPC(8): H03H9/64H03H9/52
CPCH03H9/52H03H9/6489
Inventor 胡孝伟代文亮马举
Owner XWAVE TECH (SHANGHAI) CO LTD