| US 7,577,416 B2 | ||
| Single balanced mixer | ||
| Masayuki Kimishima, Gyoda (Japan) | ||
| Assigned to Advantest Corp., Tokyo (Japan) | ||
| Filed on Jan. 08, 2001, as Appl. No. 9/756,442. | ||
| Prior Publication US 2001/0027091 A1, Oct. 04, 2001 | ||
| Int. Cl. H04B 1/26 (2006.01); H04B 15/00 (2006.01) | ||
| U.S. Cl. 455—313 [455/318; 455/326] | 5 Claims |
| 1. A single balanced mixer for converting an input RF signal to an IF (intermediate frequency) signal by mixing the input
RF signal with a local signal, comprising:
a first hybrid coupler for, upon receiving the local signal, producing two local signals of same amplitude and opposite phase;
a pair of mixing elements each receiving a corresponding one of the two local signals from the first hybrid coupler;
a pair of λ/4 strip lines for transmitting the input RF signal to the mixing elements, one end of each of the λ/4 strip lines
being connected to one another at a point where the input RF signal is supplied and other end of each of the λ/4 strip lines
being connected to the corresponding mixing element;
a pair of IF filters for filtering the IF signals of opposite phase produced at the mixing elements; and
a second hybrid coupler for combining the IF signals from the IF filters to produce the IF signal of same phase;
wherein a length of each of the λ/4 strip lines is one fourth of a wave length λ of the IF signal.
|