How high can radio frequency transmitters/recievers go??

[FreakyOCR]

I want to know the highest possible frequency that a radio transmitter/reciever can use...

It doens't have to exist... I just need to know... thanks...

Current production techniques through the utilization of a SiGe BiCMOS HP process can yeild a maximum oscilation frequency of 65 GHz, assuming you are fabricating the chip with .25-micron die size.

The recent implemention of .18u SiGe HBT BiCMOS chips at IBM in Burlington, Vermont should allow for an implied a maximum of 90 GHz, assuming the mathmetical model parallels the actual limitations of physics. These chips are to be utilized in both RF and additional microwave oriented technologies.

BTW, THz is around the corner, though I have not read too many technical papers about the math involved at such frequency extremes. Information is limited to theoretics at this time.

Robert Richmond

[Kuasimodem]

From here

In honor of the German radio pioneer Heinrich Hertz, his name has been given to the cycle per second (hertz, Hz); 1 kilohertz (kHz) is 1000 cycles per sec, 1 megahertz (MHz) is 1 million cycles per sec, and 1 gigahertz (GHz) is 1 billion cycles per sec. Radio waves range from a few kilohertz up to 30 gigahertz (30,000,000,000 Hz).

RobRich,
When you get up into the Thz range, aren't you approaching the frequency of light? (science & physics was a while back, fuzzy memory)

[sKiT]

is this what you need?


Visible Light 430 THz to 750 THz

Three different posts, three different responses. My info is from the chip manufacturing side of the equation, though I believe Skit's link offers the best breakdown possible according to currently accepted physics models. It can be theorized that the response to your question would essentially approach the limit of infinity, as all energy exhibits a frequency effect upon examination of dimensional models like the "string theory".

I analyze technology from the mathmatical perspective in terms of what physical research is actually available right now. One of the best databases for info like this is the IBM research center tech doc search:

http://www.research.ibm.com/resource...r_search.shtml

Catch ya' later,
Robert Richmond

[sKiT]

I had to memorize that damn list when i was in Naval Avionics

[FreakyOCR]

Basically what I need is a transmitter that can transmit a frequency that cannot be replicated with any ease.... Basically I wouldn't want regular people to be able to get ahold of it...

In theory, the THz range through RF emmission should be possible, though the energy signature would not specifically be in a form of "light" as expected. IR radiation is extensible throughout the lower bands of the THz range, though an RF "overlap" (lack of a better word) still basically exists. It would be determinate upon the actual transimission source and medium before a conclusion could be offered. Ranges approaching infinitely small measurements would offer the best resolution for RF analysis at this level due to the discreet electromagnetic properties involved, though longer distances would (in theory) produce results more attributable to a quantized light packet like IR.

Hope this helps,
Robert Richmond

[sKiT]

everytime rob speaks, i swear i see I.Q. points jumping right out of my pockets!

What range and singnal propogation/radiation charactersitics are needing for this device? These questions will need to the answered before one could offer analysis of such a scenario.

Want ease of use with minimal public intrusion? Why not any currently accepted RF band with a specific modulation and/or CTCSS code overlayed. Add a couple of simple transistor stages which only respond to your unique CTCSS code, then you are in business.

Robert Richmond