Cellular antenna working inside all-metal case

Capacitive-feed antenna that can be enclosed in an all-metal mobile handset case

Antenna working inside all metal case

Antenna working inside all metal case

People that know and follow me a longer period already note that I am reading and collecting anything about embedded cellular antennas that looks unique.  My hard disk is full with files about special small embedded antennas.
Today I make a text public that I found inside the magazine of Pulse. What Pulse is showing and doing is real amazing.  I assume that we can use this technology for M2M applications, too.
Think about a metal box to transport bank notes or the metal frame of a bike. Or the metal enclosure of a vending or even an ATM machine. With this new antenna technology I can make some further dreams real.

Text by Pulse antenna

Pulse launched recently the first capacitive-feed antenna that can be enclosed in an all-metal mobile handset case. Our capacitive-feed antenna can be used in mobile phones that operate at 900, 1800, 1900, and 2100 megahertz as well as several antenna manufacturing technologies such as flexible printed wiring board, laser direct structuring (LDS), and molded interconnect device (MID).The antenna radiator is placed at the outside surface of the phone chassis and fed by a capacitively coupled feed circuit. All available antenna function is utilized with no loss of signal performance. The antenna quality, reliability, and operation are based on proven technology found in all Pulse antenna systems. Design FreedomThe solution offers flexibility in phone design and manufacturing. It can be used either as a stand-alone solution or integrated, for example, with the all-metal cover. Without having to coat the antenna with plastic, the metal shell and the antenna can be constructed as a single unit. The metallic appearance can be ap-plied to the antenna area or the metal cover. The metal cover can also be decorated with paint, leather, or other materials without affecting antenna performance.  Integrating an antenna into an all-metal cover design can result in reduced costs.  Pulse optimizes the knowledge it has gained from working with a broad range of customer designs and options.  A new antenna model can be customized without having to redesign every model, offering additional customer savings. Metal covers are becoming more popular in mobile phones because they give mobile handsets rigidity and strength, enable thinner devices with bigger displays, are made of recyclable material, and provide an effective dispersion of radio engine heat.  They are also pop-ular because the cover is more attractive. “Although the trend for mobile phones is to encase them completely with metal, there has not been an antenna that performs adequately in an all-metal cover.  In the past, plastic had to be used to cover the antenna portion of the handset to enable proper antenna performance.  With our capacitive-feed antenna, exterior metal parts can now also be used as antennas,” says R&D Director Petteri Annamaa.

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