array_synthesis/antennaArray.py at main · majedo-net/array_synthesis · GitHub

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import numpy as np
from scipy.spatial import KDTree
from patchAntenna import PatchAntenna
from dipoleAntenna import DipoleAntenna
from spiralAntenna import SpiralAntenna

class AntennaArray():
    '''
    Class to represent an antenna array

    '''

    def __init__(self):
        self.elements = []
        self.excite_idx = None
        return

    def circ_count(self,len_d, count=0):
        count = 6+(2*len_d) + count
        if len_d <=0:
            return count
        len_d = len_d-1
        return circ_count(len_d,count)

    def rps(self,fmax,r,N):
        d0 = (3e8/fmax)/2
        d0 = d0*1000
        if r >=1:
            xi = 1
        else:
            xi = 1/((N**r) - (N-1)**r)
        d= np.zeros(N+1)
        for n in range(N+1):
            d[n] = d0*xi*(n+1)**r
        return d

    def circ_positions(self,d):
        self.xs = []
        self.ys = []
        for n,dn in enumerate(d):
            n_layer = (2*n) + 6
            wd = (2*np.pi/n_layer)
            for w in np.arange(0,(2*np.pi),wd):
                self.xs.append(dn*np.cos(w))
                self.ys.append(dn*np.sin(w))

        self.xs = np.insert(self.xs,0,0)
        self.ys = np.insert(self.ys,0,0)

    def rotate_positions(self,rot_angles):
        theta = rot_angles * np.pi / 180
        rotmat = np.array([[np.cos(theta), -1*np.sin(theta)],
                       [np.sin(theta), np.cos(theta)]])
        for n,t in enumerate(theta):
            if n==0: b=0
            else: b = self.circ_count(n-1)
            if n>0: b+=1
            e = self.circ_count(n) +1
            [self.xs[b:e],self.ys[b:e]] = np.matmul(rotmat[:,:,n],[self.xs[b:e],self.ys[b:e]])

    def generateRPSPositions(self,fmax,r=1,Nrps=3,rotations=None):
        self.circ_positions(self.rps(fmax,r,Nrps))
        self.N = len(self.xs)
        if rotations is not None:
            self.rotate_positions(rotations)
        self.xmax = np.max(np.abs(self.xs))
        self.ymax = np.max(np.abs(self.ys))
        self.xmin = np.min(self.xs)
        self.ymin = np.min(self.ys)
        self.zmax = 0

    def generateSingle(self):
        self.N = 1
        self.xs = [0.0]
        self.ys = [0.0]
        self.xmax = np.max(np.abs(self.xs))
        self.ymax = np.max(np.abs(self.ys))
        self.xmin = np.min(self.xs)
        self.ymin = np.min(self.ys)
        self.zmax = 0

    def getNearestNeighborSA(self,idx,Nr):
        '''
        generates the nearest neighbor subarray object
        '''
        points = list(zip(self.xs.ravel(),self.ys.ravel()))
        tree = KDTree(points)
        ds,idxes = tree.query([self.xs[idx],self.ys[idx]],k=(Nr+1))
        return self.generateSubarray(idxes)

    def generateSubarray(self,ids):
        '''
        generates a new array object with a subset of the elements for use in subarray simulations.
        '''
        new_elements = []
        for idx in ids:
            new_elements.append(self.elements[idx])
        ta = AntennaArray()
        ta.elements = new_elements
        ta.xs = []
        ta.ys = []
        for idx in ids:
            ta.xs.append(self.elements[idx].x)
            ta.ys.append(self.elements[idx].y)
        ta.xmax = np.max(ta.xs)
        ta.xmin = np.min(ta.xs)
        ta.ymax = np.max(ta.ys)
        ta.ymin = np.min(ta.ys)
        ta.zmax = self.zmax
        for idx in range(len(ta.elements)):
            ta.elements[idx].x -= (ta.xmax-ta.xmin)/2 +ta.xmin
            ta.elements[idx].y -= (ta.ymax-ta.ymin)/2 +ta.ymin
            ta.xs[idx] -=(ta.xmax-ta.xmin)/2 +ta.xmin
            ta.ys[idx] -=(ta.ymax-ta.ymin)/2 +ta.ymin
        return ta

    def initPatchElements(self):
        for id in range(len(self.xs)):
            self.elements.append(PatchAntenna(
                id,
                L_=10.2,
                W_=15.5,
                x_=self.xs[id],
                y_=self.ys[id],
                hs_=1.5,
                epsr_=4.2))
        self.zmax = 10

    def initDipoleElements(self,f0,orientation='x'):
        for id in range(len(self.xs)):
            excite=False
            if id == self.excite_idx: excite = True
            self.elements.append(DipoleAntenna(
                id,
                f0,
                x_=self.xs[id],
                y_=self.ys[id],
                orientation_=orientation,
                excite_=excite
            ))
        if orientation== 'z': self.zmax = 30

    def initSpiralElements(self,r0,rmax,h,hs=0.5,epsr=4.5,alpha=0.32):
        self.xmax = np.max(np.abs(self.xs)) + rmax
        self.ymax = np.max(np.abs(self.ys)) + rmax
        self.zmax = 3*h
        for id in range(len(self.xs)):
            excite = False
            if id == self.excite_idx: excite = True
            self.elements.append(SpiralAntenna(
                id,
                x_=self.xs[id],
                y_=self.ys[id],
                r0_=r0,
                rmax_=rmax,
                alpha_=alpha,
                h_=h,
                hs_=hs,
                epsr_=epsr
            ))