Frequency-selecting interdigital transducer
A technology of interdigital transducers and transducers, applied in the direction of electrical components, impedance networks, etc., can solve problems such as the inability to realize the compound filtering effect of two-dimensional lattice transducers, and achieve breakthroughs in frequency response limitations and flexible frequency selection The effect of the characteristic
Active Publication Date: 2015-06-10
GUANGDONG CANCHIP TECH CO LTD
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Its program such as figure 2 As shown, but the author only uses the dot matrix to complete the energy limiting function at a single frequency point. There is no further research on the frequency selection of multiple frequency points of the filter structure (such as passband frequency pass characteristics, stopband frequency suppression characteristics), that is, it cannot be realized. Composite filtering effect with 2D lattice transducer
[0005] So far, the micron-scale piezoelectric structure of the two-dimensional lattice is used in the frequency selection of the surface acoustic wave interdigital transducer, especially the scheme to improve the frequency characteristics of the passband and stopband has yet to be proposed.
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[0026] The technical solutions of the present invention will be further described in detail below through the accompanying drawings and embodiments.
[0027] The invention provides a composite interdigital transducer which adopts a two-dimensional lattice and has frequency selection characteristics.
[0028] image 3 It is a schematic structural diagram of a frequency-selective interdigital transducer according to an embodiment of the present invention. As shown in the figure, the frequency-selective interdigital transducer includes a piezoelectric substrate 30, a one-dimensional interdigital transducer 31, a two-dimensional metal lattice 32, and a bus bar 33. The one-dimensional interdigital transducer 31 is arranged on the piezoelectric substrate 30, and the two-dimensional metal lattice 32 is arranged on the electrode of the one-dimensional interdigital transducer 31, so the one-dimensional The interdigital transducer 31 and the two-dimensional metal lattice 32 are superimposed...
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The invention relates to a frequency-selecting interdigital transducer. The transducer comprises a piezoelectric substrate, a one-dimensional interdigital transducer and a two-dimensional metal dot matrix, wherein the one-dimensional interdigital transducer is arranged on the piezoelectric substrate, the two-dimensional metal dot matrix is arranged on the one-dimensional interdigital transducer, and a pass band or a stop band is generated by selecting a specific value between the period of the two-dimensional metal dot matrix and the period of one electrode of the one-dimensional interdigital transducer. Matrix elements of the two-dimensional metal dot matrix are made of copper, tungsten or gold. The electrode of the one-dimensional interdigital transducer is made of aluminium, copper or gold. The piezoelectric substrate is made of lithium tantalite, lithium niobate or quartz. When a proportion between the period of the electrode of the one-dimensional interdigital transducer and the period of the two-dimensional metal dot matrix is in the range of 1.1 to 6.6, the band-pass frequency characteristic is realized. When a proportion between the period of the one-dimensional interdigital transducer and the period of the two-dimensional metal dot matrix is in the range of 0.2 to 6, the band elimination frequency characteristic is realized.
Description
Technical field [0001] The invention relates to the field of electronic components, in particular to a frequency selective interdigital transducer. Background technique [0002] The interdigital transducer is small in size and can efficiently excite and receive surface acoustic waves (SAW). It is a typical electro-acoustic-electric conversion structure in surface wave filters and other surface wave devices. It responds to acoustic waves in surface acoustic wave devices. The excitation and reception of the signal can modulate, so as to realize the function of frequency selection. [0003] Conventional interdigital transducers are metal interdigital transducers arranged periodically on the piezoelectric substrate material such as figure 1 As shown, 11 is a piezoelectric substrate, 12 is an interdigital transducer, 13 is a bus bar, and the interdigital period is λ. Its amplitude frequency response is determined by the shape and material of the interdigital transducer. Because of its m...
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IPC IPC(8): H03H9/25
Inventor李红浪何世堂刘久玲梁勇
OwnerGUANGDONG CANCHIP TECH CO LTD