Patent ID: 9666929
Date: 2017-05-30
CPC Classifications: H01P

Claim:
1. A balun comprising: a first transmission line including an end terminal for receiving or outputting a signal with a target wavelength, and having a length of half the target wavelength; and a number (N) of second transmission lines, each of which is disposed adjacent to and spaced apart from said first transmission line so as to establish electromagnetic coupling therebetween, each of which includes a first end terminal and a second end terminal for cooperatively outputting or receiving a differential signal pair with the target wavelength, and a grounded central terminal, and each of which has a first length that is between said first end terminal and said central terminal thereof and that equals a quarter of the target wavelength, and a second length that is between said second end terminal and said central terminal thereof and that equals a quarter of the target wavelength, where N is an integer greater than or equal to two, wherein each of said second transmission lines has a width 1/N times that of said first transmission line.