Patent ID: 11967769
Assignee: AGC INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A layered antenna structure comprising:
a planar antenna; and
m layers of a dielectric, m being an integer equal to or more than one, on which the planar antenna is layered,
wherein, where an electrical length of a thickness of an x-th layer of a dielectric is denoted as Lx, x being an integer equal to or more than one, Lx is expressed as:, L
    x
   
   =
   
    
     t
     x
    
    
     (
     
      1
      /
      
       
        ε
        
         r
         ⁢
         x
        
       
      
     
     )
    
   
  
  ,, and
wherein tx is a thickness of the x-th layer of the dielectric and εrx is a relative permittivity of the x-th layer of the dielectric;
where a wavelength of a predetermined frequency in air is denoted as λ0, and N is an integer equal to or more than zero, the layered antenna structure satisfies:, 1
      +
      
       (
       
        N
        ×
        2
       
       )
      
     
     4
    
    ×
    
     0
     .
     8
    
    ⁢
    5
    ×
    
     λ
     0
    
   
   ≦
   
    
     
      ∑
       
     
     
      x
      =
      1
     
     m
    
    ⁢
    
     L
     x
    
   
   ≦
   
    
     
      1
      +
      
       (
       
        N
        ×
        2
       
       )
      
     
     4
    
    ×
    
     1
     .
     1
    
    ⁢
    5
    ×
    
     λ
     0
    
   
  
  ;
 

wherein the planar antenna comprises:
a dielectric layer including a first surface and a second surface on a side opposite from the first surface;
an antenna conductor provided on the first surface;
a ground conductor provided on the first surface or the second surface, or provided on both of the first surface and the second surface; and
a transmission line including a signal line that is connected to the antenna conductor or provided in proximity to the antenna conductor,
wherein a dielectric portion of the dielectric layer that is in contact with the signal line has a loss tangent of 0.007 or less at 28 GHz.