| Conical antennas are widely used in many applications because of their broad input impedance bandwidth and omni-directional radiation pattern. However, conical antennas usually have three-dimensional structures and are, hence, relatively difficult to fabricate and integrate. In this thesis, a quasi-planar conical antenna is designed, where dielectric loading could mechanically stabilize the antenna while maintaining the input impedance invariant within a broad band. Specifically, a few configurations of the quasi-planar conical antenna are simulated, fabricated, and tested. Simulation and measurement results show excellent agreements. It is concluded in this thesis that, the quasi-planar conical antenna is mechanically light and robust, easy to fabricate and re-configure, and it exhibits all of the nice electrical properties of the conventional conical antennas. |
