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(a). Two mutually coupled LC tanks terminated with balanced gain on the left and loss on the right side G1 = G2 = G (b) real and (c) imaginary parts of evaluated eigenfrequencies by perturbing G. In the illustrated plots, only eigenvalues with the positive real parts are drawn. (d) The coalescence factor corresponding to calculated eigenvectors which showing the degeneracy of two eigenvectors exactly at Ge(e) Root locus of zeros of Yin (ω) − G = 0 showing the real and imaginary parts of resonance frequencies of the circuit when perturbing both load resistance and gain G. At the EPD, the system’s total admittance is Yin (ω) − Ge ∝ (ω − ωe) 2; hence it shows a double zero at ωe.
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