Abstract: An apparatus to create uniform electric and magnetic-field distribution as zeroth-order resonance in a waveguide and a cavity according to an embodiment of the present invention includes a rectangular waveguide with a rectangular-shaped cross section comprising a cavity in the inside, and a conductive helical wire inserted into the cavity of the waveguide, wherein the main body of the conductive helical wire does not contact the inner surfaces of the waveguide at a predetermined gap, and both ends of the conductive helical wire are short-circuited to the inner surface of the waveguide, so as to create a uniform electric field and magnetic field throughout the entire waveguide.

Abstract: A multi input multi output (MIMO) antenna with no phase change is provided. The MIMO antenna having no phase change constituting one antenna structure overall, wherein unit structures at both sides are symmetrical to each other in a meander form with respect to the center; the unit structures having the meander form are connected to a ground plate by using as a medium power feeding units 240 and 250 supplying an electric energy to the respective unit structures; and the unit structures are installed with a three-dimensional structure, being adjacent to the ground plate.

Abstract: An apparatus to create uniform electric and magnetic-field distribution as zeroth-order resonance in a waveguide and a cavity according to an embodiment of the present invention includes a rectangular waveguide with a rectangular-shaped cross section comprising a cavity in the inside, and a conductive helical wire inserted into the cavity of the waveguide, wherein the main body of the conductive helical wire does not contact the inner surfaces of the waveguide at a predetermined gap, and both ends of the conductive helical wire are short-circuited to the inner surface of the waveguide, so as to create a uniform electric field and magnetic field throughout the entire waveguide.

Abstract: A multi input multi output (MIMO) antenna with no phase change is provided. The MIMO antenna having no phase change constituting one antenna structure overall, wherein unit structures at both sides are symmetrical to each other in a meander form with respect to the center; the unit structures having the meander form are connected to a ground plate by using as a medium power feeding units 240 and 250 supplying an electric energy to the respective unit structures; and the unit structures are installed with a three-dimensional structure, being adjacent to the ground plate.

Abstract: An apparatus and method for detecting a defect on a ground layer of microstrip by using scattering parameters is disclosed. The apparatus includes: a providing unit for providing a signal to the microstrip by changing a frequency of the signal in a predetermined range of frequencies; a detecting unit for detecting scattering parameters of an output signal from the microstrip in response to the frequency of the signal; and an analyzing unit for analyzing the interface based on the scattering parameters.

Abstract: An apparatus and a method for measuring an electric magnetic interference (EMI) level of a radio frequency device is disclosed. The apparatus for measuring a level of electric magnetic interference (EMI) with an electronic device to radiate an electromagnetic wave, the apparatus including: a test device for outputting a signal in response to the electromagnetic wave radiated from the electric device; a calculating unit for calculating a group_delay variation information of the test device by using the signal from the test device; a processor for storing a reference group_delay variation; and an analyzer for analyzing the level of EMI by comparing the reference group_delay variation information and the group_delay variation information.

Abstract: An apparatus and a method for measuring an electric magnetic interference (EMI) level of a radio frequency device is disclosed. The apparatus for measuring a level of electric magnetic interference (EMI) with an electronic device to radiate an electromagnetic wave, the apparatus including: a test device for outputting a signal in response to the electromagnetic wave radiated from the electric device; a calculating unit for calculating a group_delay variation information of the test device by using the signal from the test device; a processor for storing a reference group_delay variation; and an analyzer for analyzing the level of EMI by comparing the reference group_delay variation information and the group_delay variation information.

Abstract: An apparatus and method for detecting a defect on a ground layer of microstrip by using scattering parameters is disclosed. The apparatus includes: a providing unit for providing a signal to the microstrip by changing a frequency of the signal in a predetermined range of frequencies; a detecting unit for detecting scattering parameters of an output signal from the microstrip in response to the frequency of the signal; and an analyzing unit for analyzing the interface based on the scattering parameters.