1. Good radiation efficiency. Most FR4-based patches have very high efficiency because FR4 is very lossy at 5.8 GHz. 2. Also, most array antennas have higher losses in the feed network. This design uses a coupled patch to keep the feed network simple and reduce these losses. 3. Very good axial ratio, not only directly perpendicular to the patch but also off-center. 4. High gain, but not higher than the theoretical gain for an array with . This is because maximizing the gain results in high side lobes and poor axial ratio. 5. Very low side lobes, with almost all the energy concentrated in the main lobe. This increases the width of the main lobe, but adds some gain. Center frequency:5.8 GHz Bandwidth:660 MHz (5.47 - 6.13 GHz) Matching: S11 Less than - 20 dB, VSWR Less than 1.22 (at center frequency) Axial ratio: Less than 1.3 dBi antenna gain: 9.4 Half-power beamwidth: 55 (lateral and longitudinal) Radiation efficiency: 83.5% These values are based on simulations, actual measured values are below (they are very similar). Due to the variation in dielectric constant of FR4, the center frequency may shift between batches. Also, not all FR4 have the same dielectric constant. It is normal for the frequency to shift to 100 MHz. Due to different batches, there may be differences in product appearance and printed text, which not affect use. Specification:SMA Colour:Blue Material:Plastic+Metal Package Contents: 1 x Triple Feed Patch Array Antenna 1 x Adapter Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.