Planar end-fire pattern reconfigurable antenna

A planar end-fire pattern reconfigurable antenna, comprising:

• a dielectric substrate, a radiation patch, a ground plane, a switch and bias circuit, and a coaxial cable, wherein the dielectric substrate comprises a first surface and a second surface in opposite, the radiation patch is attached to the first surface of the dielectric substrate, the ground plane comprises a radial slot, the ground plane is attached to the second surface of the dielectric substrate, the switch and bias circuit is arranged in the radial slot of the ground plane, the coaxial cable comprises an outer conductor and an inner conductor, the outer conductor is connected to the ground plane, and the inner conductor penetrates through the dielectric substrate and is connected to the radiation patch;
• wherein the coaxial cable is arranged at a geometric center of the planar end-fire pattern reconfigurable antenna, and used for exciting the radiation patch and the ground plane, the radiation patch is used for generating electromagnetic radiation from a magnetic dipole perpendicular to a plane of the radiation patch, the ground plane is used for generating electromagnetic radiation from an electric dipole parallel to a plane of the ground plane, and the switch and bias circuit generates a reconfigurable end-fire radiation pattern by controlling on-off state combination of a switch of the switch and bias circuit;
• wherein the radiation patch has an Alford loop structure, and comprises outer ring branches and connecting arms, the outer ring branches are connected to the connecting arms, a gap is formed between the outer ring branches, and a number of the outer ring branches is the same as that of the connecting arms;
• and
• wherein the radial slot is internally provided with the switch and bias circuit, the switch and bias circuit is arranged near an edge of the ground plane, and comprises a PIN diode, an inductor, a capacitor, and a direct current connecting wire, and a number of the switch and bias circuit is the same as that of the radial slot.