Design of Active Integrated GNSS Antenna Based on the Impedance Transforming Quadrature Four-Feed Network

Figure 9

Simulated results of the impedance-transforming rat-race coupler. (a) S-parameters for port 1 excitation. (b) Amplitude imbalance and phase difference for port 1 excitation. (c) S-parameters for port 3 excitation. (d) Amplitude imbalance and phase difference for port 3 excitation.

(a)

(b)

(c)

(d)