Circularly polarized Ka-band reflectarray (RA) antennas are designed and fabricated using novel broadband closely spaced elements. We present the broadband element study for the Ka-band. Three different circularly polarized RA antennas are developed and fabricated from a single dielectric substrate using three distinct elements, which are optimized. All antennas are made of 625 elements that occupy $\text{6.25}\times \text{6.25}\lambda ^{2}$ at 30 GHz. A circularly polarized Ka-band conical horn antenna is used to excite the RA. The measured results exhibit good agreement with the simulations. Each of the proposed antennas provides an overall 30% bandwidth that represents the measured bandwidth of $-$10-dB reflection coefficients, 1-dB gain variation, and the 3-dB axial ratio. The estimated maximum aperture efficiency is 55% at 30 GHz. Two larger RAs of size $\text{25.25}\times \text{25.25}\; \lambda ^{2}$ (10 201 elements) are designed with focal-to-diameter (F/D) ratio 0.59 and 2.74, respectively, to show that the path loss is the main reason affecting the gain bandwidth.