Abstract:
A filter of the present invention comprises a multilayer substrate, two terminals, a ground conductor and a hybrid resonator. The multilayer substrate includes a plurality of conductor layers and a dielectric configured to isolate said plurality of conductor layers from each other. The hybrid resonator is disposed in the multilayer substrate and comprises a first and a second resonant elements and a coupling strip connecting the first and said second resonant elements. Each resonant element comprises a signal via, a group of ground vias and an artificial dielectric. Each signal via is disposed through the multilayer substrate. Each group of ground vias is disposed through the multilayer substrate and configured to surround the signal via. Each artificial dielectric is disposed in the multilayer substrate and between the signal via and the group of ground vias. The artificial dielectric comprises a conductive plate connected to the first signal via and an isolating slit isolating the first conductive plate from the group of ground vias.
Abstract:
A printed circuit board is disclosed. A top layer power supply pattern and a top layer ground pattern are formed. The top layer power supply pattern and the top layer ground pattern are connected to a power supply layer and a ground layer through a plurality of viaholes, respectively. A plurality of capacitors or a plurality of capacitor resistor series circuits are disposed at predetermined intervals between the top layer power supply pattern and the top layer ground pattern.
Abstract:
An electromagnetic shielding member includes magnetic and conductive members (3; 2) alternately arranged. At least one of the conductive members may be replaced with an elastic conductive electromagnetic shielding member. The shielding member can be used to seal a seam or door of a conductive metal casing (4). The conductive rod may have an L-section (Figure 5) or a U-section (Figure 6) with the magnetic rod being of square section and fitted therein.
Abstract:
The device disclosed is for measuring a Specific Absorption Rate (SAR) in a human body exposed to electromagnetic fields (8) radiating from an antenna (4), and is constituted by a phantom (5) (a model of the human body) and a probe structure (1). The phantom has equivalent electric constant of permittivity and permeability as those of a human body. The probe structure (1) has a combination of first and second loop probes (2,3) orthogonal to each other, and is arranged such that the second loop probe receives only a magnetic field that has been reflected from a surface of the phantom. Thus, the magnetic field radiating from the antenna and the magnetic field reflected from a surface of the phantom are distinguished from each other. The reflected magnetic field is corrected and the SAR can be accurately measured.
Abstract:
An electromagnetic shielding member includes magnetic and conductive members (3; 2) alternately arranged. At least one of the conductive members may be replaced with an elastic conductive electromagnetic shielding member. The shielding member can be used to seal a seam or door of a conductive metal casing (4). The conductive rod may have an L-section (Figure 5) or a U-section (Figure 6) with the magnetic rod being of square section and fitted therein.
Abstract:
There is provided a PCB (Printed Circuit Board) design support system capable of reducing radiation of electromagnetic waves by optimizing layout (11) of a substrate. The PCB design support system is composed of a section to input information about layout (11) of the PCB including information about ground plane (12) structure, power plane (13) structure and layout of a PCB including information about positions of mounting active elements (14) such as LSIs, ICs or a like and at least one decoupling capacitor (15), a section to build a calculation model (22) for calculating voltages between the ground plane (12) and power plane (13) and distribution of currents flowing on the ground plane (12) and power plane (13) using input information, a section to select a specified frequency and to calculate a voltage and current distribution occurring at the selected frequency between the ground plane (12) and power plane (13) and a section to display obtained voltage and current distribution in a form of two-dimensional voltage and current distribution maps corresponding to shapes of the PCB. The PCB design support system enables a via-hole (33) disposed between planes and/or wiring installed between planes causing variations in voltages to be specified in a precautionary manner from a stage of design of PCBs.