Spiral Antenna

IE3D is aantenna modelling software. i want to design two arn archimedean spiral micrstrip antenna.kindly provide the details.IE3d is a ZELAND's software.www.zeland.com

i don think anyone on here will know... sorry haha

2007-05-22 00:35:25 by SHASHIKANT P

Glass marble

Spiral geometry design for 3 10 Ghz bandwidth

Ultra-Wideband (UWB) is a technology for transmitting information spread over a large bandwidth that should, in theory and under the right circumstances, be able to share spectrum with other users. A February 14, 2002 Report and Order by the Federal Communications Commission (FCC) [1] authorizes the unlicensed use of UWB in 3.1–10.6 GHz. This is intended to provide an efficient use of scarce radio bandwidth while enabling both high data rate personal-area network (PAN) wireless connectivity as well as longer-range, low data rate applications as well as radar and imaging systems. More than four dozen devices have been certified under the FCC UWB rules, the vast majority of which are radar, imaging or positioning systems. Deliberations in the International Telecommunication Union Radiocommunication Sector (ITU-R) have resulted in a Report and Recommendation on UWB in November of 2005. National jurisdictions around the globe are expected to act on national regulations for UWB very soon.

Ultra Wideband was traditionally accepted as impulse radio, but the FCC and ITU-R now define UWB in terms of a transmission from an antenna for which the emitted signal bandwidth exceeds the lesser of 500 MHz or 20% bandwidth. Thus, pulse-based systems—wherein each transmitted pulse instantaneously occupies a UWB bandwidth, or an aggregation of at least 500 MHz worth of narrow band carriers, for example in orthogonal frequency-division multiplexing (OFDM) fashion—can gain access to the UWB spectrum under the rules. Pulse repetition rates may be either low or very high. Pulse-based radars and imaging systems tend to use low repetion rates, typically in the range of 1 to 10 megapulses per second. On the other hand, communications systems favor high repetition rates, typically in the range of 1 to 2 gigapulses per second, thus enabling short-range gigabit-per-second communications systems. Each pulse in a pulse-based UWB system occupies the entire UWB bandwidth, thus reaping the benefits of relative immunity to multipath fading (but not to intersymbol interference), unlike carrier-based systems that are subject to both deep fades and intersymbol interference.

The FCC power spectral density emission limit is the same as for unintentional emitters in the UWB band, but is signficantly lower in certain segments of the spectrum.

A significant difference between traditional radio transmissions and UWB radio transmissions is that traditional transmissions transmit information by varying the power/frequency/and or phase in distinct and controlled frequencies while UWB transmissions transmit information by generating radio energy at specific times with a broad frequency range.

One of the valuable aspects of UWB radio technology is the ability for a UWB radio system to determine "Time of Flight" of the direct path of the radio transmission between the transmitter and receiver. With any radio transmission the signals reflect off of metallic objects and result in different radio signal paths that then can arrive at the receiver later in time and interfere with radio transmission that went directly from the transmitter to the receiver. With frequency based transmissions the sinusoidal waves add/subtract at the receiver antenna and make it difficult or impossible to distinguish the direct transmission path from the reflected paths. This is called "multi-path fading" and "multi-path interference". However, with UWB transmissions the time encoding can be randomly dithered and the receiver can then determine which is the direct path. With a bidirectional system or a radar system this allows distances to be determined much more accurately.

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Possible applications
Due to the extremely low emission levels, UWB systems tend to be short-range. However, due to the short duration of the UWB pulses, extremely high data rates are possible, and data rate can be readily traded for range by simply scaling the number of pulses per data bit. Conventional OFDM technology can also be used subject to the minimum bandwidth requirement of the regulations. High data rate UWB can enable wireless monitors, the efficient transfer of data from digital camcorders, wireless printing of digital pictures from a camera without the need for an intervening personal computer, and the transfer of files among cell phone handsets and other handheld devices like personal digital audio and video players.

UWB also has the potential to enable "see-through-the-wall" imaging technology and high-precision time-of-arrival-based localization approaches. [1] It is expected to exhibit excellent efficiency with a spatial capacity of approximately 1,000,000 bit/s/m².

UWB is also the new standard behind wireless HDMI, with products expecting to appear in Q4 2006 http://www.extremetech.com/article2/0,15 58,2011975,00.asp?kc=ETRSS02129TX1K00005 32

UWB is a possible technology for use in the Body Area Networks.

2006-10-19 00:36:23 by Ram k

Price: $137.00

I'm trying to create a small antenna on my circuit board. So far it looks as if I have to draw concentric arcs and connect them end to end with radial lines.

Come on, PADS uber-designers! I'm clueless.

You may have more responses if you post in a PC design forum like the one below. Just a thought or two- If you can import Gerber files you could make a spreadsheet and mathematically calculate points on the spiral separated by about twice the track width. Then make a simple Gerber file (using the spreadsheet string formulas) using the X and Y coordinates of the points thus making a fairly smooth spiral. After importing into a blank PC you can edit track width as needed then copy into a library.

2008-06-07 12:50:40 by Beelzebufo ampinga

Price: $199.00

I overheard a conversation this guy was saying that our DNA spirals, our galaxy spirals, and energy waves spiral and that the spiral of black peoples hair is like antennae that can channel natural knowledge and energy from the earths energy and magnetic field. Have you ever heard of anything like this?
$©ã®Le†† it was an overheard conversation. Maybe YOU need to put the crack pipe down or read the question more carefully.

lol this is funny never heard of this but to the who luvs me chick there is a such thing as black Israelites

2009-05-16 21:49:48 by ʍ○○η šнΐηє

Maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at its' end, or at a location in it, so they could be connected to make parallel induction coils, with or without an inner end connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors, which would probably work and behave like a tank circuit, and could be adjusted by how the lines are spaced, and by how many time each is wound, or maybe even a type of antenna, or set of antennas.

Or make a coiled wire, and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, another wire, or any other arrangement(s) - basically letting the mind keep wondering, and keep testing and calculating.....

Want more?
Have they ever tried standard material and/or other material, induction cores, made with open ends, closed at one, or at both, tapped in different ways, spiraled in different shapes (circular, triangular, etc...), or coated with molded plastic, at different thicknesses, etc, etc....?
Since there will always be new things, these shape ponderings might lead to some wiled stuff!!!

To me, learning from a book is basically memorizing what is already known, but real learning happens when your imagination kicks-in!

Thanks for thinking/pondering with me, and I hope it gets and keeps you wondering too!!!

lol, sound like you have spent as much time pondering as i have.

I agree with your view on books. Pondering is fun, but from my experience it is best to focus on things you can change, or move yourself into a place you can change those things.

I got big ideas too. Maybe someday we will be able to do more that just blog about them...

2009-07-04 22:09:38 by Thumper