| Description | Claims | Drawing |
| EP17175123A | [0005] |
| GB2316539A | [0007] |
| A Sleeve Monopole Antenna with Wide Impedance Bandwidth for Indoor Base Station Applications | [0006] |
| Design of a wideband sleeve antenna with symmetrical ridges | [0006] |
| A novel wideband sleeve antenna with capacitive annulus for wireless communication applications | [0006] |