High-sensitivity wireless receiving device and high-frequency unit used therefor
AssigneeNtt Docomo, Inc.
InventorsShoichi Narahashi, Kunihiro Kawai, Kei Satoh, Toshio Nojima
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Abstract
In a high sensitive radio receiver system for a diversity reception from two antennae per each of three sectors (SC1, SC3, SC3), a series connection of a bandpass filter (31 to 36) and a low noise amplifier (41 to 46) is contained in each of a plurality of vacuum chambers (81 to 86), the interior of which is cooled by a distinct, separate cooling unit (91 to 96). The two antennae per sector are connected to bandpass filters contained in different vacuum chambers.
Claims28
A high sensitive radio receiver system for receiving a signal from at least two antennae provided in each of a plurality of sectors, comprising:
- a plurality of vacuum chambers;
- a plurality of cooling units each for cooling the interior of each of the plurality of vacuum chambers;
- a plurality of bandpass filters each contained in one of the vacuum chambers and deriving a received h.f. signal in a predetermined frequency band, said at least two antennae of each sector being connected to the bandpass filters contained in different ones of the plurality of vacuum chambers;
- and
- low noise amplifiers each contained in corresponding one of said vacuum chambers and connected in series to an output of corresponding one of the plurality of bandpass filters, for amplifying and delivering the received h.f. signal;
- wherein each combination of each series connection of the bandpass filter and the low noise amplifier, the vacuum chamber which contains the series connection and the cooling unit which cools the series connection constitute a high frequency receiver unit.
A high frequency receiver unit for filtering, amplifying and delivering a received h.f. signal which is input thereto, comprising
- a vacuum chamber;
- a cooling unit for cooling the interior of the vacuum chamber;
- a first signal path contained within the vacuum chamber and including a series connection of a superconducting bandpass filter which operates in its superconducting state at or below a critical temperature and a low noise amplifier for passing a received h.f. signal therethrough;
- and
- a second signal path including a normal conducting bandpass filter which operates at least above the critical temperature of the superconducting bandpass filter and having a substantially same passband as the superconducting bandpass filter and which delivers the received h.f. signal while bypassing the first signal path whenever the superconducting bandpass filter is no longer in its superconducting state.
Dependencies are inferred from the claim text.