A NOVEL DUAL-FREQUENCY OMNIDIRECTIONAL ANTENNA WITH TRANSMISSION LINE RESONATORS LOADING

A novel dual-frequency antenna with horizontally polarized (HP) omnidirectional radiation is presented in this paper. The antenna consists of four printed arched dipoles, four planar baluns, and a four-way power splitter. The balun as well as the power splitter works as the feed network. By loading a transmission line resonator (TLR) as the near-field coupling parasitic element, the dual-frequency characteristics can be realized. After the design principle is stated, a sample antenna is manufactured and measured to prove the predicted performance of the proposed antenna. The measured results agree well with the predicted ones.