Duplexer, multiplexer, high-frequency front-end circuit and communication device

A technology of duplexer and multiplexer, applied in high-frequency front-end circuits and communication devices, duplexers, and multiplexers, can solve the problems of low impedance at Fs frequency, complex impedance characteristics of FBAR, and high impedance at Fp frequency , to achieve the effect of improving roll-off, high roll-off and out-of-band suppression

Pending Publication Date: 2020-01-07
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, FBAR has more complex impedance characteristics. In the impedance curve, the impedance at the Fs frequency is lower, and the impedance at the Fp frequency is higher.

Method used

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  • Duplexer, multiplexer, high-frequency front-end circuit and communication device
  • Duplexer, multiplexer, high-frequency front-end circuit and communication device
  • Duplexer, multiplexer, high-frequency front-end circuit and communication device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] figure 2 It is a circuit configuration diagram of the duplexer 2 according to the embodiment. Such as figure 2 As shown, the duplexer 2 includes a transmit side filter 21 , a receive side filter 22 and an antenna terminal 23 .

[0070] The transmission side filter 21 receives a transmission wave generated by a transmission circuit through a transmission input terminal 24, filters the transmission wave in a transmission pass band, and outputs it to the antenna terminal 23 which is a transmission side output terminal. More specifically, the transmitting side filter 21 includes an LC resonance unit 211 , a resonator 212 , a capacitor 213 , matching inductance elements 214 to 217 and a transmitting input terminal 24 .

[0071] The LC resonance unit 211 is connected between the transmission input terminal 24 and the antenna terminal 23; the resonator 212 is connected between the transmission input terminal 24 and the reference terminal (ground), and the capacitor 213 is ...

Embodiment 2

[0082] Figure 9 It is a circuit configuration diagram of the duplexer 3 according to the embodiment. Such as Figure 9 As shown, the duplexer 3 includes a transmitting filter 31 , a receiving filter 32 and an antenna terminal 33 .

[0083] The transmission side filter 31 receives a transmission wave generated by a transmission circuit through a transmission input terminal 34, filters the transmission wave in a transmission pass band, and outputs it to the antenna terminal 33 which is a transmission side output terminal. More specifically, the transmitting side filter 31 includes an LC resonance unit 311 , resonators 312 - 313 , a capacitor 314 , matching inductance elements 315 - 318 and a transmitting input terminal 34 .

[0084] The LC resonance unit 311 is connected between the transmission input terminal 34 and the antenna terminal 33; the resonators 312-313 are connected in parallel between the transmission input terminal 34 and the reference terminal (ground), and the...

Embodiment 3

[0092] Figure 10 It is a circuit configuration diagram of the duplexer 4 according to the embodiment. Such as Figure 10 As shown, the duplexer 4 includes a transmitting filter 41 , a receiving filter 42 and an antenna terminal 43 .

[0093] The transmission side filter 41 receives a transmission wave generated by a transmission circuit through a transmission input terminal 44, filters the transmission wave in a transmission pass band, and outputs it to the antenna terminal 43 which is a transmission side output terminal. More specifically, the transmission-side filter 41 includes resonators 411 to 412 , a capacitor 413 , inductance elements 414 to 418 for matching, and a transmission input terminal 44 .

[0094] The resonator 411 is connected between the transmission input terminal 44 and the antenna terminal 43, the resonator 412 is connected between the transmission input terminal 44 and the reference terminal (ground), and the capacitor 413 is connected between the antenn...

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PUM

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Abstract

The invention provides a duplexer, a multiplexer, a high-frequency front-end circuit and a communication device. The duplexer or the multiplexer comprises a transmitting-side filter and a receiving-side filter, the transmitting-side filter and the receiving-side filter are jointly connected and connected to an antenna terminal, and the roll-off of a transition zone can be effectively improved in the multiplexer by setting the frequency position of a resonator. Meanwhile, due to the impedance characteristic of a FBAR resonator, out-of-band rejection can be deteriorated near a roll-off edge, anextra out-of-band zero point can be formed by adopting a plurality of resonators with different frequencies and electromechanical coupling coefficients, and the out-of-band rejection can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a duplexer, a multiplexer, a high-frequency front-end circuit and a communication device. Background technique [0002] Broadband filters, duplexers, and multiplexers are generally implemented using LC filters, which can achieve a bandwidth of several GHz. LTCC is widely used in LC filters due to its various advantages. However, due to the limitation of the Q value, it has a greater disadvantage than FBAR in terms of insertion loss, out-of-band suppression and roll-off. FBAR has a higher Q value, which can achieve better insertion loss, out-of-band rejection, roll-off and other performance. However, due to the limitation of the electromechanical coupling coefficient, it is difficult to achieve a wide bandwidth. Therefore, combining the broadband characteristics of LTCC and the high Q value characteristics of FBAR can realize a filter with better performance. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): H03H9/70H04B1/40
CPCH03H9/706H04B1/40
Inventor 庞慰蔡华林
Owner TIANJIN UNIV
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