Haruhumi Mandai

Chip multilayer antenna for 2.45 GHz-band application using LTCC technology

Utilizing the radiation from not only the antenna but GND plane of antenna-mounted terminals can contribute to reduce the size and weight of a chip antenna drastically without spoiling high performance. The optimization of the mounting conditions for the chip multilayer antenna is indispensable to realize higher performances. A wide bandwidth of more than 100 MHz (VSWR<2) is required for the 2.45 GHz applications such as Bluetooth, Home-RF and so on. This paper investigates optimization of the mounting conditions for the chip antenna. The chip multilayer antenna is a suitable antenna for 2.45 GHz-band applications under the optimized mounting conditions.

Antenna switch duplexer for dualband phone (GSM/DCS) using LTCC multilayer technology

The multilayer antenna switch duplexer is chiefly utilized for European dualband phones (GSM/DCS) and contributes not only to reducing the size and weight, but also to shortening the development time of the RF circuit and simplifying the assembly process. DOE and Monte Carlo simulation are utilized to develop the duplexer. These simulation methods are very efficient in shortening the development time and improving the manufacturing yield.