QUOTE(chuahcs79 @ Aug 8 2012, 02:25 PM)
u can try method below:
picture is better than thousand word,
we call this reflecting technology.
it works if signal frequency already reach into one place well and by using a curve object to reflect the signal back to the antenna reception point of a device with a hope to pool/divert more scattered signal to this main subject. the result how will depends on how well expertise to shape the reflecting curve angle/size to fit the reception point. (last time i put a pro 24dbi parabolic wifi antenna feeding part to a clock size curve reflector, the result worsen than 14dbi antenna bcoz the reflecting size not correct for the feeding part.)
more like a passive technology.
antenna on the hand is producing gain (dbi) which able to reach to a certain distance away depends on wireless transmission power(mW) of the device, (either for broadcasting or for reception job), not a passive solution. There is metal to metal, pin to pin connectivity, signal passing through copper metal. frequency must correct to have real gain, resistance from start to end must be matched.
so basically a passive way vs active way.
one main drawback of using reflecting technology today is about the heat dissipation of the device. As last time regradless 3G or wifi device mostly low heat product not big deal then. but nowadays newer 3G modem with hot qualcomm chipset / high power wifi adapter really need a better open air condition to help release its heat faster for longer product lifespan or for stability. Aluminum foil material used in reflector fully surrounding device will on the other hand prevent that or even help accumulate the heat surrounding the device.