US 4,792,939 AGranted

Duplex radio communication transceiver

AssigneesHitachi Denshi Kabushiki Kaisha, Hitachi, Ltd.

InventorsMitsutaka Hikita, Atsushi Sumioka, Yoshikatu Ishida, Kunihiro Hamada, Yutaka Chiba, Yoshio Abe

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Abstract

In order to reduce the size of a duplex radio communication transceiver such as a mobile telephone, this transceiver is constructed of a transmitting and receiving duplexer, a filter to be coupled to the duplexer, an amplifier for amplifying a signal received, and a filter to be connected with the output of the amplifier. All the filters are made of acoustic surface wave filters, and all the circuits are mounted on a single metallic substrate and sealed by means of a metallic casing into a module. The transceiver thus constructed has a volume which is one tenth as small as that of the device of the same kind according to the prior art.

Claims12

Dependent claims

A duplex radio communication transceiver comprising:

(a) a module including the following parts mounted on a single metallic substrate:
a branching circuit having an antenna terminal to be coupled to an antenna, a transmission signal input terminal and a reception signal output terminal;
a transmitting acoustic surface wave filter coupled to said transmission signal input terminal;
a first acoustic surface wave filter coupled to said reception signal output terminal;
a receiving amplifier for amplifying the output of said first acoustic surface wave filter;
and
a second acoustic surface wave filter for inputting the output of said receiving amplifier;
(b) a mixer for mixing the output of said second acoustic surface wave filter and the output of a local oscillator;
(c) an intermediate amplifier for amplifying the output of said mixer;
and
(d) a transmission signal power amplifying part for amplifying power of a signal to be transmitted to apply it to said transmitting acoustic surface wave filter.

8 more elements

A duplex radio communication transceiver comprising:

(a) a module including the following parts mounted on a single metallic substrate:
a branching circuit having an antenna terminal to be coupled to an antenna, a transmission signal input terminal and a reception signal output terminal;
a transmitting acoustic surface wave filter coupled to said transmission signal input terminal;
a first acoustic surface wave filter coupled to said reception signal output terminal;
a receiving amplifier for amplifying the output of said first acoustic surface wave filter;
a second acoustic surface wave filter for inputting the output of said receiving amplifier;
and
a mixer for mixing the output of said second acoustic surface wave filter and the output of a local oscillator;
(b) an intermediate amplifier for amplifying the output of said mixer;
and
(c) a transmission signal power amplifying part for amplifying power of a signal to be transmitted to apply it to said transmitting acoustic surface wave filter.

8 more elements

Dependencies are inferred from the claim text.