Micro electromechanical switches

• US 20020186108A1
• Filed: 04/01/2002
• Published: 12/12/2002
• Est. Priority Date: 04/02/2001
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hallbjorner, Paul
• Application Number:
  US10/112,051
• Publication Number:
  US 20020186108A1
• Time in Patent Office: Days
• US Class Current: 335/78
• CPC Class Codes: H01H 59/0009 making use of micromechanics
• CPC Class Codes: H01P 1/12 by mechanical chopper
• CPC Class Codes: H01P 1/18 Phase-shifters H01P1/165 takes precedence
• CPC Class Codes: H01Q 3/38 the phase-shifters being digital

Abstract

A micro electromechanical N-way switch comprising normally open micro electromechanical switches and normally closed micro electromechanical switches arranged in up to 2^C rows with C columns of a logical functions matrix. Each row of predetermined serially coupled micro electromechanical switches will create, when selected, a signal path to one way of the N-way switch. The micro electromechanical switches are commonly controlled column by column. Also a phase shift arrangement is shown, with a limited predetermined number of micro electromechanical switches in the signal path, irrespective of the number of selectable phase shift elements.

Claims

1. A switching circuit and a switching circuit signal path control arrangement therefor comprising a plurality of micro electromechanical switches each having a signal path with a first connection at one end of the signal path and a second connection at the other end of the signal path, and at least two control lines controlling the micro electromechanical switches, the micro electromechanical switches being at least two normally open micro electromechanical switches each having an active signal path when activated, and at least two normally closed micro electromechanical switches each having an active signal path when not activated, characterized in that:

the micro electromechanical switches are arranged in a logical function matrix comprising at least two rows and two columns, on a row by row basis the first connections of micro electromechanical switches of a first column being signal connections at a first side of the logical function matrix and second connections of micro electromechanical switches of a last column being signal connections at a second side of the logical function matrix;

the signal paths of the micro electromechanical switches are serially coupled on a row by row basis;

the control lines controlling the micro electromechanical switches are coupled to the micro electromechanical switches on a column by column basis with one control line per column, the micro electromechanical switches arranged in a column of the logical function matrix being commonly controlled by a single control line, this constitutes the switching circuit signal path control arrangement;

thereby controlling the signal paths of the switching circuit with a number of control lines being less than the number of micro electromechanical switches.

2. The switching circuit and the switching circuit signal path control arrangement according to claim 1, characterized in that:

the maximum number of rows with micro electromechanical switches of the virtual matrix is limited to 2^C, where C is the number of columns of the virtual matrix.

3. The switching circuit and the switching circuit signal path control arrangement according to claim 1 or 2, characterized in that:

the normally open micro electromechanical switches and the normally closed micro electromechanical switches are arranged in predetermined sequences in each row;

each row comprises a unique predetermined sequence.

4. The switching circuit and the switching circuit signal path control arrangement according to any one of claims 1 to 3, characterized in that:

the connections of the first side of the virtual matrix are coupled together, making a demultiplexer switching circuit.

5. The switching circuit and the switching circuit signal path control arrangement according to any one of claims 1 to 3, characterized in that:

the connections of the second side of the virtual matrix are coupled together, making a multiplexer switching circuit.

6. A phase shift arrangement comprising a number of selectable phase shift elements, characterized in that the selectable phase shift elements are selected by means of a switching circuit and a switching circuit signal path control arrangement according to any one of claims 1 to 5.