Newbie starting point
I would like some advice on where to start for a loop antenna testing.
The goal would be initially for transmitting and receiving a remote
control. I don't have a target frequency per say in mind, maybe 900MHz
ISM, or somewhere in the 300-400MHz area. The range would be just a
few meters of distance.
- It is my opinion, after working on these loops for a number of years,
that they are not good for high frequencies. I saw a Radio Shack 100
MHz loop - but that is about as high in frequency as I have ever seen
- --- In firstname.lastname@example.org, "Bruce Carter" <rbrucecarter@...>
>Well, then again there are looped antennas used at those frequencies,
> It is my opinion, after working on these loops for a number of years,
> that they are not good for high frequencies. I saw a Radio Shack 100
> MHz loop - but that is about as high in frequency as I have ever seen
> them used.
but not used in the sense most use loop antennas at lower frequencies.
The size of the loop becomes a substantial fraction of a wavelength
and they are often just laid flat, etched right onto a PCB.
Here are some links I'd previously posted on Electronics_101 about
microwave striplines and antennas:
Appcad by Agilent
Freeware. Useful RF tools including stripline.
Applied Wave Research TX Line calculator
Free calculator for Transmission lines. Microstripline, slotline,
stripline, coplanar waveguide, etc. Free trial version.
A horizontally mounted loop that is vertically polarized and has good
gain. Designed for 144MHz but you can scale the sizes according to
Dual Ring DDRR without ground plate
Dual ring DDRR does not require a ground plate.
Electromagnetic Waves, Microwave Techniques
Transmission lines, antennas, techniques
Microstrip Analysis/Synthesis Calculator
Open source web-based microstripline calculator. Offline version also
Microstrip Trace Impedance Calculator
Web-based calculator, allows entering of copper thickness by mils or
oz. All other sizes in mils (1/1000ths of an inch) Any parameter can
be the variable.
Microstrip impedance calculator
Web-based, in mils or mm. Any parameter can be the variable.
Microwave Stripline Impedance Calculator
Microwave stripline impedance calculator. Java applet. Downloadable.
MultiStrip aka MStrip
Freeware program to calculate microstrip antennas. Window and DOS
versions. Their link to online manual is broken, see link to it here.
Multistrip aka MStrip online manual
The link on their website is broken, here is the correct link.
RF Cafe's Microstrip Equations
Page of equations, plus downloadable free microstripline calculator.