The slot-fed Yagi aerial employs a half wavelength dipole (3) composed of two pieces of thin metal rods, and its feeding section is of a shielded slot structure (6), and its feeding is realized by the slot (7).
A bi-directional YAGI type RFID tag antenna structure has director elements on two opposite sides so that the YAGI antenna radiates in two opposite directions.
A portable Yagi antenna kit (20) for being frequency/wavelength adjustable by virtue of being knockdownable, wherein the Yagi antenna is for mounting to a mast (22).
According to the log periodic dipole antenna-coupled yagi antenna, a log periodic dipole antenna (LPDA) is connected to a wave guide of the yagi antenna to increase gain, thereby resonating into a wide frequency band.
The L-band transmit antenna is a wire Yagi antenna mounted between dishes.
The present invention relates to a log periodic dipole antenna-coupled yagi antenna.
Preferably, the Yagi antenna elements are printed on a printed circuit board.
Asymmetrical three-dimensional radiating system composed by a modified Yagi-Uda (YU) antenna (10, 10'), whose asymmetrical radiating pattern in elevation is provided by a three-dimensional antenna structure.
Parasitic elements, such as a reflector and one or more directors, are added at appropriate separations to form a Yagi antenna.
As a result, the yagi antenna may be significantly improved in terms of the receiving function thereof, and thus used as a digital television antenna.
A sailor operating the receiver can switch to use the yagi antenna and using the signal strength indication means determine and monitor the direction of an overboard sailor relative to the vessel.