Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1982-12-08
1985-07-23
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455317, 455327, 455330, H04B 110, H04B 126
Patent
active
045312362
ABSTRACT:
A microwave integrated circuit frequency converter includes a first filter (30) for a signal frequency and a second filter (32) for a local oscillator frequency connected at one terminal thereof with one terminal of the signal frequency filter (30) by a line (38), (40) having a predetermined electrical length. A parallel stub line (42) is short-circuited at one end thereof. A diode (34) is connected at its one end to a third filter (36) which is adapted to reflect the signal and local oscillator frequencies while passing an intermediate frequency. The diode (34) is connected at the other end to a line (41). The parallel stub line (42) and line (41) are connected at their other ends to a specific junction P on the connecting line (38), (40) at which the impedance is open circuited for the signal frequency when the local oscillator frequency filter (32) is seen from the signal frequency filter (30) side and the impedance is open circuited for the local oscillator frequency when the signal frequency filter (30) is seen from the local oscillator frequency filter (32) side.
REFERENCES:
patent: 4211977 (1980-07-01), Shinkawa et al.
patent: 4412351 (1983-10-01), Onishi et al.
Ng Jin F.
Nippon Electric Co. Ltd.
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