//VerilogA for passive,wgarc,veriloga

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

module wgarc(Ipow,Iphase,Ilam,Opow,Ophase,Olam);
    parameter integer modespec = 1 from [1:2];
    parameter integer alpha_use_dBm = 1 from [0:1];
    parameter real reffreq = 193.1e12 from (0:inf);
    parameter real neff_te_0 = 2.6 from (0:inf);
    parameter real neff_tm_0 = 2.6 from (0:inf);
    parameter real n_gv_te = 4.2 from (0:inf);
    parameter real n_gv_tm = 4.2 from (0:inf);
    parameter real disper_te = 0;
    parameter real disper_tm = 0;
    parameter real attenu_te = 0 from [0:inf);
    parameter real attenu_tm = 0 from [0:inf);
    parameter real phasedelay_te = 0;
    parameter real phasedelay_tm = 0;
    parameter real coupling_tem = 0;
    parameter real redius = 1e-3 from (0:inf);
    parameter real angle = 90 from (0:inf);
    parameter real kn_te = 0;
    parameter real kn_tm = 0;
    parameter real A_te = 0 from [0:inf);
    parameter real A_tm = 0 from [0:inf);
    parameter real B_te = 0 from [0:inf);
    parameter real B_tm = 0 from [0:inf);

    input Ipow,Iphase,Ilam;
    output Opow,Ophase,Olam;
    electrical Ipow,Iphase,Ilam,Opow,Ophase,Olam;

    real eeir,eeii,emir,emii;
    real eeor,eeoi,emor,emoi;
    real t11r,t11i,t12r,t12i,t21r,t21i,t22r,t22i;
    real beta_ter,beta_tei,beta_tmr,beta_tmi,beta_avr,beta_avi,beta_dvr,beta_dvi;
    real delta,trandelta,cdd,bddr,bddi;
    real rfront,ifrontch,t11r1,t1r2,t11i1,t1i2,t22r1,t2r2,t22i1,t2i2;
    real alpha_te0,alpha_tm0;
    real dn_te,dn_tm,dalpha_te,dalpha_tm;
    real alpha_te,alpha_tm,neff_te,neff_tm;
    real length=redius*angle/180*`M_PI;
    real phasedelay_te_u=phasedelay_te/360.0*2*`M_PI;
    real phasedelay_tm_u=phasedelay_tm/360.0*2*`M_PI;
    real freq;
    real iph;

    analog begin
        freq=`P_C/V(Ilam);
        iph=V(Iphase)/360.0*2*`M_PI;
        if (modespec == 1) begin
            eeir=sqrt(V(Ipow))*cos(iph);
            eeii=sqrt(V(Ipow))*sin(iph);
            emir=0;
            emii=0;
        end
        else if (modespec == 2) begin
            eeir=0;
            eeii=0;
            emir=sqrt(V(Ipow))*cos(iph);
            emii=sqrt(V(Ipow))*sin(iph);
        end

        alpha_te0=0.1*ln(10)*attenu_te;
        alpha_tm0=0.1*ln(10)*attenu_tm;
        dn_te=kn_te/pow(redius,2);
        dn_tm=kn_tm/pow(redius,2);
        dalpha_te=A_te/sqrt(redius)*exp(-B_te*redius);
        dalpha_tm=A_tm/sqrt(redius)*exp(-B_tm*redius);

        neff_te=neff_te_0+dn_te;
        neff_tm=neff_tm_0+dn_tm;
        alpha_te=alpha_te0+dalpha_te;
        alpha_tm=alpha_tm0+dalpha_tm;

        if (alpha_use_dBm == 1) begin
            alpha_te=0.1*ln(10)*alpha_te;
            alpha_tm=0.1*ln(10)*alpha_tm;
        end

        beta_ter=2*`M_PI*reffreq/`P_C*neff_te+2*`M_PI/`P_C*n_gv_te*(freq-reffreq)-`M_PI*`P_C*disper_te/pow(reffreq,2)*pow(freq-reffreq,2);     
        beta_tei=-alpha_te/2;
        beta_tmr=2*`M_PI*reffreq/`P_C*neff_tm+2*`M_PI/`P_C*n_gv_tm*(freq-reffreq)-`M_PI*`P_C*disper_tm/pow(reffreq,2)*pow(freq-reffreq,2);
        beta_tmi=-alpha_tm/2;
        if (coupling_tem == 0) begin
            rfront=exp(beta_tei*length);
            t11r1=cos(phasedelay_te_u-beta_ter*length);
            t11i1=sin(phasedelay_te_u-beta_ter*length);
            t22r1=cos(phasedelay_tm_u-beta_tmr*length);
            t22i1=sin(phasedelay_tm_u-beta_tmr*length);

            t11r=rfront*t11r1;
            t11i=rfront*t11i1;
            t12r=0;
            t12i=0;
            t21r=0;
            t21i=0;
            t22r=rfront*t22r1;
            t22i=rfront*t22i1;
        end
        else begin
            beta_avr=(beta_ter+beta_tmr)/2;
            beta_avi=(beta_tmi+beta_tmi)/2;
            beta_dvr=(beta_ter-beta_tmr)/2;
            beta_dvi=(beta_tmi-beta_tmi)/2;
            delta=sqrt(beta_dvr*beta_dvr+beta_dvi*beta_dvi+coupling_tem*coupling_tem);
            trandelta=delta*length;
            cdd=coupling_tem/delta;
            bddr=beta_dvr/delta;
            bddi=beta_dvi/delta;

            rfront=exp(beta_avi*length);
            t11r1=cos(trandelta)+bddi*sin(trandelta);
            t11i1=-bddr*sin(trandelta);
            t1r2=cos(phasedelay_te_u-beta_avr*length);
            t1i2=sin(phasedelay_te_u-beta_avr*length);
            ifrontch=-cdd*sin(trandelta);
            t2r2=cos(phasedelay_tm_u-beta_avr*length);
            t2i2=sin(phasedelay_tm_u-beta_avr*length);
            t22r1=cos(trandelta)-bddi*sin(trandelta);
            t22i1=bddr*sin(trandelta);

            t11r=rfront*(t11r1*t1r2-t11i1*t1i2);
            t11i=rfront*(t11r1*t1i2+t11i1*t1r2);
            t12r=rfront*ifrontch*t1i2;
            t12i=rfront*ifrontch*t1r2;
            t21r=rfront*ifrontch*t2i2;
            t21i=rfront*ifrontch*t2r2;
            t22r=rfront*(t22r1*t2r2-t22i1*t2i2);
            t22i=rfront*(t22r1*t2i2+t22i1*t2r2);
        end

        eeor=t11r*eeir-t11i*eeii+t12r*emir-t12i*emii;
        eeoi=t11r*eeii+t11i*eeir+t12r*emii+t12i*emir;
        emor=t21r*eeir-t21i*eeii+t22r*emir-t22i*emii;
        emoi=t21r*eeii+t21i*eeir+t22r*emii+t22i*emir;

        V(Olam) <+ V(Ilam);
        if (modespec == 1) begin
            V(Opow) <+ eeor*eeor+eeoi*eeoi;
            V(Ophase) <+ atan2(eeoi,eeor)*360.0/(2*`M_PI);
        end
        else if (modespec == 2) begin
            V(Opow) <+ emor*emor+emoi*emoi;
            V(Ophase) <+ atan2(emoi,emor)*360.0/(2*`M_PI);
        end
    end

endmodule