# US 5,708,361 A · Antenna arrangement for a magnetic resonance apparatus

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- Number: US 5,708,361 A
- Document ID: US5708361A
- Status: Granted
- Kind: A
- Application number: 08/721,119
- Filed: 1996-09-26
- Granted: 1998-01-13
- Earliest claimed: 1995-09-29
- Assignees: Siemens Aktiengesellschaft
- Inventors: Jianmin Wang; Axel Friedrich
- Web page: https://patentgrep.com/patent/US5708361A

## CPC

- G01R 33/365: {Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array}
- G01R 33/3415: comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

An antenna arrangement for a magnetic resonance apparatus has at least two adjacent individual antennas. Each individual antenna has at least one conductor loop. For mutual decoupling, the conductor loops of the adjacent individual antennas each have an interruption. The interruptions are electrically connected in parallel and are jumpered with at least one capacitive element, the capacitive element having a capacitance value at which the individual antennas are decoupled from one another.

## Claims

### Claim 1

An antenna arrangement for a magnetic resonance imaging apparatus comprising:
at least two adjacent individual antennas, each individual antenna having at least one conductor loop, each conductor loop having an interruption therein;
an electrical connection directly connecting the respective interruptions in the respective conductor loops of said at least two individual antennas in parallel; and
at least one capacitive element connected across at least one of said interruptions, said capacitive element having a capacitance for decoupling said at least two individual antennas from each other.

### Claim 2 (depends on 1)

An antenna arrangement as claimed in claim 1 wherein the respective conductor loops of the two adjacent individual antennas have respective sections facing each other, and wherein said interruptions are respectively disposed in said sections.

### Claim 3 (depends on 1)

An antenna arrangement as claimed in claim 1 comprising a capacitive element disposed in every interruption.

### Claim 4 (depends on 1)

An antenna arrangement as claimed in claim 1 wherein said electrical connection includes a sheath wave barrier.

### Claim 5 (depends on 1)

An antenna arrangement as claimed in claim 1 further comprising, for each individual antenna;
a preamplifier connected to the individual antenna and a transformation and matching circuit connected between the preamplifier and the individual antenna, said preamplifier having an input resistance for maximizing an impedance effective for the individual antenna connected thereto, said impedance being determined by said transformation and matching circuit and by said input resistance.