First they were trying to gain room inside the iPhone 4 so that they could make it thinner and have a larger battery, and secondly, they were trying to get the antenna(s) outside of the device, just as you would by using an external antenna sticking out the top of the device.
With its built-in antenna, the device also receives conventional 2D 416x240 resolution MDTV broadcasts and scales images up to 800x480 resolution.
ENGADGET: LG's glassesless 3D Mobile DTV eyes on (update: video)
As the court noted, Aereo has one TV antenna and one recording device for each subscriber.
FORBES: Barry Diller's Aereo Streaming-TV Service Wins Big Ruling Against Broadcasters
In analog cellular days every phone had an external antenna, this gave the device better range when it was communicating with the cell sites.
Art Stewart, vice president of wireless products at sensor maker AuthenTec, which provided fingerprint sensors for the phone, says LG had "antenna issues" with the device.
Mechanics spot strange things stuck under cars all the time, but when 20-year-old Yasir Afifi's ride was put up on lifts his shop found something that hadn't been kicked up from the road: a cylindrical tube connected to a device with an antenna.
At issue is a technical flaw in the new model of the popular iPhone that causes the cell phone's signal to fade when it is gripped around the device's external antenna.
ENGADGET: Senator Chuck Schumer writes open letter to Steve Jobs, world is officially doomed
Next is the fact that we are not talking about a single antenna for the iPhone nor for any wireless device.
Not only is the length of the antenna important but where it is placed inside a device is just as critical.
As you can see the entire issue of antenna design and placement is critical to the performance of a wireless device.
"But Apple will need to ensure a change in material does not compromise the performance of the device, " he added, noting the infamous " antenna-gate" issue with the iPhone 4.
This makes them easy to set up--no tower or central antenna needed--as well as hard to knock out, since if one device goes down, the others will route around it.
MicroChips' titanium-encased device is about the size of a pager and has a novel flat antenna on one side that can transmit and receive radio signals from several feet outside the body.
The only notable change is an articulating, telescoping antenna that screws into the top of the phone -- a sure sign that this device is nothing but a trial unit since we'd assume retail devices would have a sexier way to stow it.
ENGADGET: Samsung's Mobile DTV-enabled Moment hands-on Hands-on
It contains a device that measures such things as temperature, motion and light intensity, and it sports a miniature antenna and a radio with a range of 10 to 50 meters.
The transfer of radio signals to and from the antenna and the radio receiver and transmitters, and the efficiency with which that is accomplished determines how well the device will perform.
应用推荐