[HCARC] Interesting antenna development

[w4wj at aol.com]

As I said many years ago...
 
It's all about BANDWIDTH!!
 
73
Don
W4WJ
 
In a message dated 10/18/2017 9:25:28 AM Central Standard Time, kerryk5ks at hughes.net writes:

 
 Yes, John, someone doesn't understand why cell towers multiply and cells 
get smaller! The reason there are more smaller cells has nothing to do 
with antennas. In some areas the capacity of cell systems has been 
nearly reached. There are no more frequencies to expand into at the 
moment so the approach is to split existing cells into several smaller 
cells. If you go from one cell to ten smaller cells you have ten times 
the capacity and each of the smaller cells runs at a lower power level. 
It has nothing to do with antennas! The driver is internet and TV on 
cell phones. Huge amounts of bandwidth are required.

Kerry


On 10/18/2017 8:20 AM, John Canfield wrote:
> /"...However, the quality of antennas degrades as they become smaller, 
> hence the need for cellular carriers to put in place large numbers of 
> cellular antennas towers to ensure adequate phone reception for 
> consumers...."/The "quality" of the antenna degrades as they become 
> smaller? What in the world? John - WB5THT
>
> On 10/18/2017 8:06 AM, Jim & Lorain Ellison wrote:
>> See 
>> http://science.dodlive.mil/2017/10/17/small-antennas-could-be-a-big-deal-for-the-air-force/?source=GovDelivery
>> for the full article.
>>
>>
>>
>> Researchers at the Air Force Research Laboratory’s Materials and 
>> Manufacturing Directorate, in partnership with Northeastern 
>> University, recently developed an ultra-compact antenna that uses a 
>> whole different approach in transmitting and receiving signals. This 
>> breakthrough could be a big step in the miniaturization of many 
>> military and commercial communication systems.
>>
>> Typical antennas rely on size to function effectively in the 
>> electromagnetic spectrum. If the antenna is not long enough to 
>> resonate at the proper frequency, the antenna will not be able to 
>> transmit or receive the desired electromagnetic waves efficiently. 
>> Over the years, impressive strides have been made in antenna 
>> miniaturization, with cellphones being a prime example. However, the 
>> quality of antennas degrades as they become smaller, hence the need 
>> for cellular carriers to put in place large numbers of cellular 
>> antennas towers to ensure adequate phone reception for consumers.
>>
>> “We identified ultra-compact antennas as the critical last step in 
>> true device miniaturization,” said Dr. Brandon Howe, AFRL materials 
>> scientist. “Researchers had successfully shrunk most electronic 
>> components, but the true miniaturization of antennas was still a 
>> missing piece.”
>>
>> The size of an efficient miniature antenna is typically about ten 
>> percent of the wavelength, whereas the ultra-compact AFRL antennas 
>> are as small as fractions of a percent of the wavelength. As a 
>> result, microwave antennas that were previously approximately a half 
>> inch can now be reduced to an object smaller than a flea (less than 
>> one millimeter). Although not an immediate replacement for small 
>> antennas, this miniaturization could be an important step toward 
>> incorporating antennas into a number of applications for which they 
>> were previously impractical.
>>
>>
>>
>> Jim Ellison
>>
>> N5NRA
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