Hello

I have problems modelling RF antenna.

Here is code:
Code:

module ANTENNA (p1, p2, mag_field);
inout p1, p2;
input mag_field;
electrical p1, p2;
magnetic mag_field, mag_induct, mag_flux;

//Coil geometry description
.......................................

// Coil inductance innH
parameter real L = .....;

// Coil area in m^2
parameter real S = ....;

// Angle between magnetic field and normale to coil plane
parameter real alpha = 0;

analog begin
	Phi(mag_induct) <+ `c_MU * Phi(mag_field);
	Phi(mag_flux) <+ Phi(mag_induct) * S * cos(alpha);
	V(p1,p2) <+ ddt(Phi(mag_flux));
	V(p1,p2) <+ L * ddt(I(p1,p2));
end
endmodule
 

Coil geometry description, coil inductance and coil area calculation I bypassed as this is not significant vis-a-vis of problem.

As you could see from code, antenna coil has 3 ports - 2 electriacl p1 and p2 and one magnetic - mag_field.
Ports p1 and p2 i use to connect antenna coil to circuit, whereas mag_field I use to connect it to generator of magnetic field. The output of this generator has also nature magnetic.

In my schema I connect model in parallel to some capacitance and do transition simulation in ADE (Analog Design Environment).

The problem is that LC tank induced voltage isn't dependent on value of capacitance.

What is wrong in my verilogA description?

Regards

Pavel.

Thank you for response, Geoffrey

How can I implement MMF() in my code. It has no relations with electrical natures (voltage or current).

Regards

Pavel.

Geoffrey, you were right

Finally this code seems to work:

Code:

// VerilogA for OUT_STAGE, COIL_RECT, veriloga

`include "constants.vams"
`include "disciplines.vams"

`define c_MU 4*`M_PI*1e-7

module COIL_RECT (ep, en, mp, mn);
inout ep, en, mp, mn;
electrical ep, en;
magnetic mp, mn, mfp, mfn;

parameter real N = 4;	// number of turns

// Calculating Rectangular Coil geometric parameters
.........................................................

// Calculating inductance in Hn for geometry in m
parameter real L = ...........................................;

// Angle between magnetic field and normale to coil plane
parameter real alpha = 0;

// Average coil area in m^2
parameter real S = ..........................................;

// Coil resistance
parameter real Rl = 1;

analog begin
	Phi(mfp,mfn) <+ N*`c_MU*Phi(mp,mn)*S*cos(alpha);         // Faraday's Law
	MMF(mfp,mfn) <+ N*I(ep,en);                                            // Amper's Law
	V(ep,en) <+ Rl*I(ep,en) - ddt(Phi(mfp,mfn)) + L*ddt(I(ep,en));
end
endmodule
 

Regards.

Pavel