A Broadband Single-Feed Circularly Polarized Patch Antenna with Wide Beamwidth

Figure 2

Transmission line model of the antenna. (a) Transmission line model of the slot coupling ( ( = 1–8) express the equivalent impedance of the slot coupling; expresses the equivalent impedance of the radiation patch). (b) Transmission line model of the microstrip ring ( expresses the input impedance of the port; expresses the characteristic impedance of the transformation line for matching with 50 ; ( = 1–8) express the characteristic impedance of the matching segments; ( = 1, 2) are the phase delay of each matching segment).

(a)

(b)