High frequency signal switching unit

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of u said relay contact terminals of said high frequency relay, and
• wherein said printed circuit board has a plurality of grooves defined therein so as to extend across a thickness thereof, in which end portions of said coaxial cables are respectively received, said external conductors of said coaxial cables are directly connected to said ground layer of said printed circuit board along said plurality of grooves.

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of said relay contact terminals of said high frequency relay;
• wherein said printed circuit board has a plurality of recesses defined therein in which end portions of said coaxial cables are respectively received;
• and
• wherein each of said internal conductors has a planar free end and a through-hole defined therein, into which one of said relay contact terminals is inserted.

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of said relay contact terminals of said high frequency relay;
• wherein said printed circuit board has a plurality of grooves defined therein so as to extend across a thickness thereof, in which end portions of said coaxial cables are respectively received;
• and
• wherein said printed circuit board is a multi-layered construction having two layers formed one upon another with strip lines made of an electrically conductive material interposed therebetween, said printed circuit board also having two ground layers formed on external surfaces of said two layers, respectively, said strip lines connecting said relay contact terminals of said high frequency relay to said internal conductors of said coaxial cables, said external conductors of said coaxial cables are directly connected to said ground layer of said printed circuit board along said plurality of grooves.

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of said relay contact terminals of said high frequency relay;
• wherein said printed circuit board has a plurality of recesses defined therein in which end portions of said coaxial cables are respectively received;
• wherein said printed circuit board is of a multi-layered construction having two layers formed one upon another with strip lines made of an electrically conductive material interposed therebetween, said printed circuit board also having two ground layers formed on external surfaces of said two layers, respectively, said strip lines connecting said relay contact terminals of said high frequency relay to said internal conductors of said coaxial cables;
• and
• wherein said printed circuit board has a plurality of recesses defined therein on one side thereof where connecting portions between said internal conductors of said coaxial cables and said strip lines are exposed.

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of said relay contact terminals of said high frequency relay;
• wherein said printed circuit board has a plurality of grooves defined therein so as to extend across a thickness thereof, in which end portions of said coaxial cables are respectively received;
• and
• wherein each of said internal conductors has a planar free end and a through-hole defined therein, into which one of said relay contact terminals is inserted.

A high frequency signal switching unit comprising:

• a casing;
• a printed circuit board accommodated in said casing and having a first surface and a second surface opposite to each other, said printed circuit board also having a ground layer formed on substantially the entire first surface;
• at least one input terminal and at least one output terminal both mounted on said casing;
• at least one high frequency relay mounted on said printed circuit board for switching between said input terminal and said output terminal so that a high frequency signal inputted into said input terminal is selectively outputted from said output terminal, said high frequency relay having a plurality of relay contact terminals and a grounding terminal;
• and
• a plurality of coaxial cables accommodated in said casing and having respective internal and external conductors for connecting said input and output terminals to said relay contact terminals of said high frequency relay;
• wherein said grounding terminal of said high frequency relay and said external conductors of said coaxial cables are connected to said ground layer of said printed circuit board, while each of said internal conductors of said coaxial cables is connected to one of said relay contact terminals of said high frequency relay;
• wherein said printed circuit board has a plurality of grooves defined therein so as to extend across a thickness thereof, in which end portions of said coaxial cables are respectively received;
• wherein said printed circuit board is of a multi-layered construction having two layers formed one upon another with strip lines made of an electrically conductive material interposed therebetween, said printed circuit board also having two ground layers formed on external surfaces of said two layers, respectively, said strip lines connecting said relay contact terminals of said high frequency relay to said internal conductors of said coaxial cables;
• and
• wherein said printed circuit board has a plurality of recesses defined therein on one side thereof where connecting portions between said internal conductors of said coaxial cables and said strip lines are exposed.