Abstract: An antenna structure capable of transmitting radio waves in multiple polarizations is positioned on a circuit board. The circuit board includes upper and lower surfaces and peripheral side wall. The antenna structure includes a first antenna array, a second antenna array, and a control circuit. Each antenna unit of the first antenna array is positioned on one of the upper surface or the lower surface, a portion of each antenna unit of the second array is positioned on the peripheral side wall. The other portion of each antenna unit bended and positioned on at least one of the upper surface or the lower surface. In activating the first antenna array and the second antenna array the control circuit can generate radio transmissions in multiple polarizations. A wireless communication device is also provided.

Abstract: An antenna structure serving as a radar emitter with extended long range function comprises a radiating element comprised of radiating units connected in series by a feeder. Each two adjacent radiating units are spaced apart from each other by a specified distance. Lengths of the radiating units are same, and width of the radiating units gradually decreases from a center to ends. The feeder transmits a current signal to the radiating element. The radiating element emits a radar beam based on the current signal.

Abstract: A small-scale antenna structure with high gain and with controllable polarization direction includes a motherboard, an antenna array thereon, and antenna units. An array of lens units is superimposed directly over and covers the antenna units. A wireless communication device using the antenna structure is also provided. The wireless communication device includes a main body and the antenna structure. The main body receives the antenna structure.

Abstract: An antenna structure serving as a radar emitter with extended long range function comprises a radiating element comprised of radiating units connected in series by a feeder. Each two adjacent radiating units are spaced apart from each other by a specified distance. Lengths of the radiating units are same, and width of the radiating units gradually decreases from a center to ends. The feeder transmits a current signal to the radiating element. The radiating element emits a radar beam based on the current signal.

Abstract: A small-scale antenna structure with high gain and with controllable polarization direction includes a motherboard, an antenna array thereon, and antenna units. An array of lens units is superimposed directly over and covers the antenna units. A wireless communication device using the antenna structure is also provided. The wireless communication device includes a main body and the antenna structure. The main body receives the antenna structure.

Abstract: An antenna structure capable of transmitting radio waves in multiple polarizations is positioned on a circuit board. The circuit board includes upper and lower surfaces and peripheral side wall. The antenna structure includes a first antenna array, a second antenna array, and a control circuit. Each antenna unit of the first antenna array is positioned on one of the upper surface or the lower surface, a portion of each antenna unit of the second array is positioned on the peripheral side wall. The other portion of each antenna unit bended and positioned on at least one of the upper surface or the lower surface. In activating the first antenna array and the second antenna array the control circuit can generate radio transmissions in multiple polarizations. A wireless communication device is also provided.

Abstract: An antenna system includes a ground plane, a microstrip-line coupler, a metal cover, and a main antenna. The microstrip-line coupler has a first input port, a second input port, a first output port, and a second output port. The metal cover is disposed above the microstrip-line coupler and coupled to the ground plane. The main antenna is coupled to the first output port and the second output port of the microstrip-line coupler. The metal cover is configured to reduce the interference from the microstrip-line coupler and to enhance the gain of the main antenna.

Abstract: An antenna system includes a ground plane, a microstrip-line coupler, a metal cover, and a main antenna. The microstrip-line coupler has a first input port, a second input port, a first output port, and a second output port. The metal cover is disposed above the microstrip-line coupler and coupled to the ground plane. The main antenna is coupled to the first output port and the second output port of the microstrip-line coupler. The metal cover is configured to reduce the interference from the microstrip-line coupler and to enhance the gain of the main antenna.