Cavity type resonator method, Shield case material evaluation system for EMC measures

Catalog No. emc71

It is used iron and aluminum for the material of back side case for plasma display or plastic with aluminum.
The hole of the case will be fixed with a conductive liner sheet.
The installation is performed through the electroconductive gasket, to avoid the case becomes antenna.
There is a big problem that it becomes a resonator, and an unnecessary electromagnetic radiation is leaked from the hole, due to 500 times radiation.
The electric wave absorption sheet covers the case and case will be conductive.
In other words an electric wave absorption function case will be a solution.
A system will be measured such materials.

Configurations

Specifications

・Frequency : 1GHz
・Specimen : Size 25mmX25mm Thickness 0.1~2mm
・Measuring instrument : Vector network analyzer, Scalar network analyzer, or synthesized sweeper with receiver
Wlndows PC ( GPIB boad with National Instrument driver 〉

Model No.

・Resonator kit
　　COE-01 Resonator
　　TMR-1D Resonator kit for 1GHz
　　TMR-5D Resonator kit for 5GHz
・Program
　　DMP-70 Program for EMC
・CM06D-APC2.9(m)APC2.9(m)-1000　
　　Coaxial cable assembly at 40GHz : 1m-2 pcs

Option

・Network analyzer, Windovs PC and printer

Figure (1)

Table (1) Q value by this system of various materials and Q value of case

Material	Q value of material	Q value of case produced with left material	Effect of EMC
Material none	6265	―	―
A	6133	2300	None
B	5635	2110	Normal
C	5370	2000	Better
D	5218	1950	Best

One example of the measurement screen when material C is measured is shown as below.
It is a resonance curve. Q value is indicated in a right part.

One example of measurement screen