Patent ID: 11916533
Assignee: nan
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A radio-frequency filter comprising:
an input node for receiving a signal;
an output node for providing a filtered signal; and
a surface acoustic wave device implemented to be electrically between the input node and the output node, the surface acoustic wave device configured to provide resonance of a surface acoustic wave having a wavelength λ and including a quartz substrate and a piezoelectric plate formed from LiTaO3 or LiNbO3 and disposed over the quartz substrate, the piezoelectric plate having a thickness greater than 2λ, the surface acoustic wave device further including an interdigital transducer electrode formed over the piezoelectric plate, the interdigital transducer electrode having a mass density ρ and a thickness T greater than, T
    threshold
   
   =
   
    
     (
     
      
       0
       .
       5
      
      MR
     
     )
    
    [
    
     a
     -
     
      b
      ⁡
      (
      
       1
       -
       
        e
        
         
          -
          ρ
         
         /
         c
        
       
      
      )
     
    
    ]
   
  
  ,, quantity MR being a metallization ratio of the interdigital transducer electrode, quantity a having a value of 0.19091λ±δa, quantity b having a value of 0.17658λ±δb, and quantity c having a value of 9.08282 g/cm3±δc.