Electric and magnetic field detection device and electric and magnetic field measurement apparatus

• US 6,844,725 B2
• Filed: 10/18/2002
• Issued: 01/18/2005
• Est. Priority Date: 10/18/2001
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hoshino, Shigeki
• Primary Examiner(s): Patidar, Jay
• Assistant Examiner(s): Aurora, Reena
• Application Number:
  US10/272,825
• Publication Number:
  US 20030076092A1
• Time in Patent Office: 823 Days
• Field of Search: 324/530, 324/157, 324260-262, 324/258, 324/226, 324/227, 324/207.21, 324/252, 360/326, 338/32.R, 365/158
• US Class Current: 324/226
• CPC Class Codes: G01R 29/0814 Field measurements related to measuring influence on or from apparatus, components or humans EMC, EMI and similar testing in general G01R31/001, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
• CPC Class Codes: G01R 31/002 where the device under test is an electronic circuit
• CPC Class Codes: H05K 1/0268 for electrical inspection or testing
• CPC Class Codes: H05K 1/0298 Multilayer circuits

Abstract

The intensity of electric and magnetic component is measured at a high-speed without reducing spatial resolution. An electric and magnetic field detection device has an electric field detection device for detecting an electric field component, and a magnetic field detection device for detecting a magnetic field component. These detection devices are so formed on a multilayer printed circuit board that they can be operated independently.

Claims

1. An electric and magnetic field detection device which detects an intensity of electric field and magnetic field comprising:

an electric field detection device;

a magnetic field detection device; and

a multilayer printed circuit board;

wherein said electric field detection device and said magnetic field detection device are formed in said multilayer printed circuit board;

wherein at least one of said electric and magnetic field detection devices include a signal conductor surrounded by a shield; and

wherein said multilayer printed circuit board includes;

a first layer, a first signal conductor being disposed on an upper surface of the first layer and a first conductive sheet being disposed on a lower surface of the first layer; and

a second layer, a second conductive sheet being disposed on an upper surface of the second layer so that the first signal conductor is positioned between the first and second conductive sheets;

wherein each of the first and second conductive sheets is electrically grounded.

2. The electric and magnetic field detection device of claim 1, wherein each of the first and second layers comprises a first set of conductors electrically interconnecting the first and second conductive sheets.

3. The electric and magnetic field detection device of claim 2, wherein the first set of conductors electrically interconnecting the first and second conductive sheets comprise through hole wirings arranged in through holes in the first and second layers, the through hole wirings and the first and second conductive sheets forming the shield surrounding the first signal conductor.

4. The electric and magnetic field detection device of claim 3, wherein the multilayer printed circuit board further comprises:

a third layer, a second signal conductor being disposed on an upper surface of the third layer; and

a fourth layer, a third conductive sheet being disposed on an upper surface of the second layer so that the second signal conductor is positioned between the second and third conductive sheets.

5. The electric and magnetic field detection device of claim 4, wherein each of the third and fourth layers comprises a second set of conductors electrically interconnecting the second and third conductive sheets comprising through hole wirings arranged in through holes in the third and fourth layers, the through hole wirings and the second and third conductive sheets forming the shield surrounding the second signal conductor.

6. The electric and magnetic field detection device of claim 1, wherein said multilayer printed circuit board comprises at least five wiring layers.

7. The electric and magnetic field detection device of claim 1, further comprising:

at least one connector which connects said detection devices to at least one electronic element located outside said multilayer printed circuit board.

8. The electric and magnetic field detection device of claim 7, wherein each connector is one of a coplanar type, a strip line type and a microstrip line type.

9. A electric and magnetic field measurement apparatus which measures an intensity of electric field and magnetic field, comprising:

an electric and magnetic field detection device of claim 1;

an amplifier connected to at least one of said field detection devices;

a spectrum analyzer connected to said amplifier; and

control means for switching and performing said measurement.

10. The electric and magnetic field measurement apparatus of claim 9, wherein said amplifier is connected to all of said field detection devices.

11. The electric and magnetic field measurement apparatus of claim 9, further comprising an additional amplifier, said amplifier and said additional amplifier each being connected to a respective one of said field detection devices.

12. An electric and magnetic field detection device which detects an intensity of electric field and magnetic field comprising:

an electric field detection device;

a magnetic field detection device; and

a multilayer printed circuit board;

wherein said electric field detection device and said magnetic field detection device are each at least partly disposed between respective layers of said multilayer printed circuit board.

13. An electric field detection device which detects an intensity of electric field comprising:

an electric field detection device; and

a multilayer printed circuit board;

wherein said electric field detection device is formed in said multilayer printed circuit board;

wherein at least one of said electric field detection devices include a signal conductor surrounded by a shield; and

wherein said multilayer printed circuit board includes;

a first layer, a first signal conductor being disposed on an upper surface of the first layer and a first conductive sheet being disposed on a lower surface of the first layer; and

a second layer, a second conductive sheet being disposed on an upper surface of the second layer so that the first signal conductor is positioned between the first and second conductive sheets;

wherein each of the first and second conductive sheets is electrically grounded;

wherein each of the first and second layers comprises a first set of conductors electrically interconnecting the first and second conductive sheets; and

wherein the first set of conductors electrically interconnecting the first and second conductive sheets include through hole wirings arranged in through holes in the first and second layers, the through hole wirings and the first and second conductive sheets forming the shield surrounding the first signal conductor.

14. A magnetic field detection device which detects an intensity of magnetic field comprising:

a magnetic field detection device; and

a multilayer printed circuit board;

wherein said magnetic field detection device is formed in said multilayer printed circuit board;

wherein at least one of said magnetic field detection devices include a signal conductor surrounded by a shield; and

wherein said multilayer printed circuit board includes;

a first layer, a first signal conductor being disposed on an upper surface of the first layer and a first conductive sheet being disposed on a lower surface of the first layer; and

a second layer, a second conductive sheet being disposed on an upper surface of the second layer so that the first signal conductor is positioned between the first and second conductive sheets;

wherein each of the first and second conductive sheets is electrically grounded;

wherein each of the first and second layers comprises a first set of conductors electrically interconnecting the first and second conductive sheets; and

wherein the first set of conductors electrically interconnecting the first and second conductive sheets include through hole wirings arranged in through holes in the first and second layers, the through hole wirings and the first and second conductive sheets forming the shield surrounding the first signal conductor.