EDNE May 2012 - (Page 11)

Antenna design offers multi-band performance novel and low cost antenna design offers efficient performance across multiple frequency bands and with a bill of materials (BOM) cost that is expected to be under 10 cents in volume, it can replace several antennas, to save on both the BOM and manufacturing costs of new generations of radio-equipped products. The concept was created to eliminate the proliferation of antennas on military equipment, and is now being offered for licensing and further development for antenna manufacturers, radio equipment OEMs, designers supporting wireless chipsets with reference designs, and design consultants in the RF marketplace. Ploughshare’s wideband antenna is a cylindrical ‘top hat’ shape employing a novel capacitive coupling structure to provide good radio frequency (RF) performance characteristics across multiple bands. Its ability to be tuned to operate across a wide frequency band offers designers the potential to signif- A The cylindrical design of the wideband antenna maintains a good radiation pattern over multiple bands. icantly reduce the size and build cost of many emergent types of communications and consumer equipment. It can also substantially reduce the design complexity that many electronics designers currently face as they attempt to integrate antennas for multiple RF protocols - and often antenna diversity as well - into increasingly smaller spaces. One current circuit-board-mountable prototype version of the antenna has been produced and tested for operation over the 2.1 to 5 GHz band, where it offers an omnidirectional radiation pattern with a gain of 5 dBi, radiation efficiency of more than 95%, and a 1.92:1 VSWR 16/4/12 15:01 Page 1 (voltage standing wave ratio). This high level of performance is achieved by an antenna structure assembled from just four simple metal and dielectric parts. The example design has an overall height of 1.5 cm and a footprint diameter of 2 cm. In this form, Ploughshare believes the antenna has potential applications to simplify the design of a range of wireless communications infrastructure equipment such as routers and in-building basestations, or in industrial and consumer radio equipment such as smart utility meter reading terminals or media streaming devices in home entertainment systems. The company has also produced a design prototype for a second version of the antenna that is capable of operating across an even wider range of frequencies such as 100 MHz to 6 GHz. This example design has a height of 10 cm and a footprint diameter of 20 cm. —by Graham Prophet  Ploughshare Innovations, www.ploughshareinnovations.com Toshiba Power Mosfet 206x125 Eng + flash.qxd:Layout 1 NUREMBERG: 8-10.5.2012, HALL 12, STAND 301 TOSHIBA DTMOS IV SUPER JUNCTION POWER MOSFETS: CHIPS WITH OPTIMISED RDS(on) x Qg AND MORE PACKAGE OPTIONS AVAILABLE The latest generation of Toshiba’s innovative family of DTMOS power MOSFETs is now available with a Vdss rating of 600V. The DTMOS IV makes your solutions more efficient, with easily controlled switching speed, achieved by optimising RDS(on) x Qg performance, enabling a more effective application design. Our compact smart isolation TO-220SIS package with copper connector instead of standard wire bonds, along with the high-performance TO-3P(N) package, form the basis for the devices available, followed by TO-220 and the compact SMD DPAK package. Other compact package options will be available in the future. www.edn-europe.com Visit us today at www.toshiba-components.com/power MAY 2012 | EDN EuropE 11 http://www.ploughshareinnovations.com http://www.toshiba-components.com/power

Table of Contents for the Digital Edition of EDNE May 2012

Cover
Contents
International Rectifier
RS Components
Masthead
Comment
International Rectifier
Pulse
Analog Devices
Toshiba
Digi-key
Bergquist
Baker's best
Test & Measurement
Agilent Technologies
Digi-key
Audio-converter-subsystem design challenges in the 21st century
Coilcraft
Silicon Labs
Digi-key
Cover Story
Digi-key
Sensor & Test
Mechatronics in design
Vicor's insert
Understand and reduce dc/dc-switching-converter ground noise
Power MOSFETs continue to evolve
Design Idea
Product Roundup
Tales from the cube

EDNE May 2012