Radiation Efficiency Improvement Method for Multifeed Circular Polarization Antenna Array with Mutual Coupling Effect

Figure 1

(a) shows the top view of the feed network which is a four-port strip line bridge, (b) is radiation patch on a thick PCB board of 4 mm, (c) is bottom view of the feed network photo, (d) is the other half of the feed network, and (e) is the photo of radiation patch.

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(e)