Tetsuo Moroya

PMC characteristics of capacitance grid with metal plate

This paper provides PMC characteristics of a capacitance grid with a metal plate and the design method using an equivalent circuit model is also provided. Measured results of very thin PMC model with the thickness of 1/150 wavelength are also provided.

Proposal of a dipole antenna unified with an AMC substrate

Various domestic appliances have become wireless, and it is necessary to establish a design theory for a small antenna. In this report, we suggest a model that has a dipole antenna unified with an AMC (Artificial Magnetic Conductor) substrate, and we show that the AMC substrate becomes a wide-plate dipole and operates as a radiation element.

Polarization conversion reflector using a metal-plate-loaded meander line

In this study, we propose a polarization conversion reflector using a metal-plate-loaded meander line and determine the reflectors axial ratio characteristics with a numerical analysis involving the method of moments. A relative bandwidth greater than 90% is obtained.

Broadband matching of a RFID antenna by using a T-type circuit

RFID usage is steadily increasing in the world, and its frequency bands are assigned in each country. RFID in UHF band is mainly used in 900MHz band. Allocated frequency bands of Europe, the USA and Japan are included from 860 to 960MHz. Broadbanding of the IC and antenna is needed to manage the worldwide RFID frequency band. This paper proposes broadband matching of a RFID antenna by using a T-type circuit. The antenna consists of a meander-line and a T-type circuit that realizes conjugate impedance matching to the IC impedance. Equivalent circuits of the antenna are shown and evaluated by parametric study. Prototype of the antenna is realized and its numerical analyses are examined.

A proposal of AMC inspired small antenna MACKEY

This paper provides an AMC inspired small antenna MACKEY that can be installed regardless of the presence of a surrounding metal.

Dual band MACKEY-E with E shaped radiator

This paper provides a MACKEY-E with E shape radiator that has dual band characteristics and works not only in free space but also on a metal plate.

A study on a dual band antenna MACKEY

A small antenna MACKEY (Metamaterial Antenna Chip developed by KIT EOE LaboratorY) consists of substrates that are metal plate loaded capacitance grids using AMC (Artificial Magnetic Conductor) substrate and dipole antenna is showing a characteristic distribution from the principle of operation, it is possible to be installed on a metal plate without affecting the characteristics of impedance and radiation in prior studies. In this report, the results of numerical analysis by FEM about the E shape model is shown. From the results, a feasibility study on the dual band MACKEY is presented.

Dual band characteristics of a linear antenna over a capacitance grid type AMC substrate

In this study, the dual band characteristics of the capacitance-grid (CG)-type Artificial Magnetic Conductor (AMC) substrate are presented, it is shown that the substrate works as an AMC substrate at the dual bands separated three times.

Dual band characteristics of a linear antenna over a capacitance-grid-type AMC substrate

This paper provides the dual band characteristics of the capacitance grid type AMC substrate and shows that the substrate works as AMC substrate at the dual bands separated three times.