發送短信 : Low-order multi-port arrays with reduced element spacing for digital beam-forming and direction-finding

__    __     ___      _____      ___      ____    
\ \\ / //   / _ \\   / ____||   / _ \\   |  _ \\  
 \ \/ //   / //\ \\ / //---`'  | / \ ||  | |_| || 
  \  //   |  ___  ||\ \\___    | \_/ ||  | .  //  
   \//    |_||  |_|| \_____||   \___//   |_|\_\\  
    `     `-`   `-`   `----`    `---`    `-` --`