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Switchable surface acoustic wave filter bank with two channel bandwidths

A surface acoustic wave and filter bank technology, applied in instruments, radio wave measurement systems, impedance networks, etc., can solve the problem of not having switchable surface acoustic wave filter banks with two channel bandwidths, etc., to achieve low insertion loss, The effect of low amplitude fluctuation, low square coefficient

Inactive Publication Date: 2009-12-16
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is no switchable SAW filter bank with two channel bandwidths in the prior art

Method used

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  • Switchable surface acoustic wave filter bank with two channel bandwidths
  • Switchable surface acoustic wave filter bank with two channel bandwidths
  • Switchable surface acoustic wave filter bank with two channel bandwidths

Examples

Experimental program
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Effect test

Embodiment 1

[0039] figure 2It is a functional block diagram of two kinds of channel bandwidth, low loss and high stopband suppression passive switchable surface acoustic wave filter bank of the present invention, which is composed of two sets of surface acoustic wave filters 3, four sets of one-knife-eight-throw switches 2 and a controller 1 . Controller 1 converts the external three-bit TTL signal into an 8-bit driving signal, and controls four sets of switches to switch simultaneously. At a certain moment, only one of the channels is turned on, and the other channels are turned off, and all the power of the input signal is added to the channel. , so there is no loss in the combined network. In this embodiment, the 1-pole, 8-throw switch is formed by parallel connection of one ends of eight 1-pole, 1-pole, 1-throw switches. The 1-pole, 1-throw switch is composed of a discrete component PIN diode circuit, and can also be made of an integrated circuit.

[0040] In this embodiment, the w...

Embodiment 2

[0050] Compared with Embodiment 1, this embodiment has a different structure of the single-phase unidirectional transducer used in the narrowband channel. In this embodiment, the filter chip of the single-phase unidirectional transducer structure is such as Figure 4 As shown, the chip is composed of two finger-weighted transducers 7 on a piezoelectric substrate 5 .

[0051] In this embodiment, the ratio of the thickness of the reflective electrode metal grid bar to the wavelength of the single-phase unidirectional transducer structure filter in the narrowband channel is 1.2%.

[0052] In this embodiment, the ratio of the reflective electrode thickness to the wavelength of the fan-shaped transducer structure filter in the broadband channel is 1.4%.

[0053] The remaining parts in this embodiment are completely consistent with Embodiment 1.

Embodiment 3

[0055] Compared with Embodiment 1, this embodiment has a different structure of the single-phase unidirectional transducer used in the narrowband channel. In this embodiment, the filter chip of the single-phase unidirectional transducer structure is such as Figure 5 As shown, in this embodiment, the chip consists of abscissa weighted transducers 6 and unweighted transducers 9 on a piezoelectric substrate 5 .

[0056] In this embodiment, the ratio of the reflective electrode thickness to the wavelength of the single-phase unidirectional transducer structure filter in the narrowband channel is 1.6%.

[0057] In this embodiment, the ratio of the reflective electrode thickness to the wavelength of the fan-shaped transducer structure filter in the broadband channel is 1.8%.

[0058] The remaining parts in this embodiment are completely consistent with Embodiment 1.

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PUM

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Abstract

The invention relates to a switchable surface acoustic wave filter bank with two channel bandwidths, comprising a multi-throw switch, a controller and a plurality of surface acoustic wave filters; it is characterized in that the plurality of surface acoustic wave filters At least one narrowband channel and one broadband channel are formed; the narrowband channel is composed of two cascaded surface acoustic wave filters, and the two surface acoustic wave filters are all made of single-phase unidirectional transducers made on quartz Structure; the broadband channel is composed of two different SAW filters cascaded, wherein the front-stage SAW filter adopts a longitudinally coupled resonant filter structure, and the rear-stage SAW filter adopts a fan-shaped filter structure. The present invention can not only realize low insertion loss in narrowband channel, but also realize lower squareness factor; meanwhile, realize low insertion loss, high stopband suppression and low squareness factor in wideband channel, and the insertion loss is close to that of narrowband channel pass.

Description

technical field [0001] The invention relates to a switchable surface acoustic wave filter bank, in particular to a switchable surface acoustic wave filter bank with low loss and high stopband suppression which is applied in a phased array radar receiver and has two channel bandwidths. Background technique [0002] The switchable surface acoustic wave filter bank that can realize the program control function is needed for frequency hopping communication and frequency-agile radar: one is to select frequency in the frequency synthesizer; the other is to do anti-interference filtering in the receiver. In the application of the receiver, the received signal is generally very weak. In order to ensure the signal-to-noise ratio of the system, the filter bank is required to have a low insertion loss; in order to suppress strong interference signals, a single filter is required to have a narrow bandwidth, steep transition band and high stop band rejection. [0003] There is no switch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/64G01S7/285
Inventor 何世堂李顺洲刘建生刘久玲
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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