In this paper, a bidirectional antenna installed inside a vehicle was proposed and the experimental results of a power link between two vehicles described.
Caption: Figure 1: Structure of the proposed bidirectional antenna: (a) single radiation patch; (b) two patches; (c) three patches.
Caption: Figure 4: Simulated and measured H-plane radiation patterns of the bidirectional antennas at 5.8 GHz: (a) single radiation patch; (b) two patches; (c) three patches.
The winning products were Comba Telecom's CriticalPointPublic Safety Bidirectional Antenna
, DragonWave's Harmony Enhanced MC, GEAR4's D3O Piccadilly Case, Jabra's Elite Sport Wireless Earbuds, Leef's iBridge 3, Sabre Industries' SmartStack small cell pole, and weBoost's Drive 4G-X signal booster.
Section 3 shows the proposed stacked bidirectional antenna structure based on the bidirectional Yagi antenna.
For comparing the performance of the traditional Yagi-Uda and the proposed bidirectional antenna, we build an optimum Yagi-Uda antenna with four directors and a bidirectional Yagi antenna with eight directors.
As shown in Figure 3(a), the bidirectional antenna has a frequency offset around 30 MHz (3.3%) from the original Yagi antenna.
Based on the bidirectional Yagi antenna mentioned in the last section, we propose a stacked bidirectional antenna in this section.
Thus the solution is to replace the omnidirectional dipole with a bidirectional antenna. In other words, it is to combine two bidirectional linearly polarized antennas orthogonally at a distance of [[lambda].sub.0]/4.
The size of the microcell zones can be efficiently increased by using bidirectional antennas, which preferentially radiate the antenna beam along the longitude [1, 2].
In these environments, for example, streets, highways, tunnels, and corridors, a unidirectional or bidirectional antenna performs better than an omnidirectional antenna [5-11].
Phongcharoenpanich, and T Wakabayashi, "A simple and cost-effective bidirectional antenna using a probe excited circular ring," IEICE Transactions on Electronics, vol.