Balun structure and electronic device

An electronic device, comprising:

• a planar microwave device and a balun structure connected to the planar microwave device,
• wherein the balun structure comprises:
• a first dielectric layer, a second dielectric layer, a ground electrode, an unbalance electrode, and a balance electrode;
• wherein the first dielectric layer, the ground electrode, the second dielectric layer are successively stacked, and the ground electrode has a coupling hole therein, the coupling hole extending from a surface facing the first dielectric layer to a surface facing the second dielectric layer;
• the unbalance electrode is disposed on a first side of the first dielectric layer, wherein the first side of the first dielectric layer is a side, distal from the ground electrode, of the first dielectric layer;
• the balance electrode is disposed on a first side of the second dielectric layer, and comprises an antenna structure, two impedance matching structures, and two transmission electrodes, wherein the first side of the second dielectric layer is a side, distal from the ground electrode, of the second dielectric layer;
• the antenna structure is provided with two arms, wherein in the direction perpendicular to the first dielectric layer, one end of each of the two arms is overlapped with the coupling hole, and the other ends of the two arms are respectively disposed on two sides of the coupling hole;
• the two impedance matching structures are respectively disposed on the two sides of the coupling hole and are respectively connected to the two arms of the antenna structure;
• the two transmission electrodes are respectively disposed on the two sides of the coupling hole and are respectively connected to the two impedance matching structures;
• and extension directions of the impedance matching structure and the transmission electrode are parallel to a length direction of the coupling hole;
• and
• in a direction perpendicular to the first dielectric layer, the unbalance electrode and the balance electrode are both at least partially overlapped with the coupling hole.