S/N ENHANCER

S/N ENHANCER

PROBLEM TO BE SOLVED: To obtain the S/N enhancer with a small size or a small insertion loss. SOLUTION: A signal, including a high level main signal and a low level noise signal, is given to a 1st directional coupler 12 of the S/N enhancer 10. The signal distributed by the 1st directional coupler 12...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: NIIMURA SATORU, MATSUZAKI HIROYASU
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
WAVEGUIDES
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To obtain the S/N enhancer with a small size or a small insertion loss. SOLUTION: A signal, including a high level main signal and a low level noise signal, is given to a 1st directional coupler 12 of the S/N enhancer 10. The signal distributed by the 1st directional coupler 12 is given to a 1st magnetostatic filter 14 and a 2nd magnetostatic filter 16. A filter that has a high conversion efficiency from an input signal into a magnetostatic wave and a low conversion efficiency from a magnetostatic wave into an output signal is adopted for the 1st magnetostatic filter 14. Conversely, a filter that has a low conversion efficiency from an input signal into a magnetostatic wave and a high conversion efficiency from a magnetostatic wave into an output signal is adopted for the 2nd magnetostatic filter 16. A 2nd directional coupler 18 is used to synthesize output signals of the 1st magnetostatic filter 14 and the 2nd magnetostatic filter 16 in phases opposite to each other.