Feed network, antenna apparatus, and communication device

An antenna apparatus, comprising a radiating element, and a feed network comprising a transmission structure that is electrically connected to the radiating element, wherein

• the transmission structure comprises a main portion and two branch portions, the main portion has a first electric-conductor and a second electric-conductor that are disposed opposite to each other, and there is a spacing between the first electric-conductor and the second electric-conductor;
• and
• the two branch portions comprise a first branch portion and a second branch portion, wherein one end of the first branch portion is electrically connected to one end of the first electric-conductor, and the other end of the first branch portion is electrically connected to a first radiation part of a radiating element in an antenna apparatus, to feed a radio frequency signal into the first radiation part;
• one end of the second branch portion is electrically connected to the second electric-conductor, and the other end of the second branch portion is electrically connected to a second radiation part of the radiating element, to feed a radio frequency signal into the second radiation part;
• and the first radiation part and the second radiation part are two radiation parts in a same polarization direction in the radiating element.

A communication device, comprising the antenna apparatus, wherein the antenna apparatus comprises a radiating element and a feed network comprising a transmission structure, wherein the radiating element is electrically connected to the transmission structure,

• the transmission structure comprises a main portion and two branch portions, the main portion has a first electric-conductor and a second electric-conductor that are disposed opposite to each other, and the first electric-conductor is spaced from the second electric-conductor by a space;
• and
• the two branch portions comprise a first branch portion and a second branch portion, wherein one end of the first branch portion is electrically connected to one end of the first electric-conductor, and the other end of the first branch portion is electrically connected to a first radiation part of a radiating element in an antenna apparatus, to feed a radio frequency signal into the first radiation part;
• one end of the second branch portion is electrically connected to the second electric-conductor, and the other end of the second branch portion is electrically connected to a second radiation part of the radiating element, to feed a radio frequency signal into the second radiation part;
• and the first radiation part and the second radiation part are two radiation parts in a same polarization direction in the radiating element.