Antenna system with high isolation characteristics

摘要

An antenna system includes a first antenna, a second antenna, a band rejection filter, and a dielectric substrate. The band rejection filter is substantially disposed between the first antenna and the second antenna. The band rejection filter includes a protruded ground element, a main branch, a first extension branch, a first additional branch, and a second additional branch. The main branch substantially has a T-shape. The first extension branch is coupled to the main branch. The first additional branch is separated from the main branch, and a first coupling gap is formed between the first additional branch and the main branch. The second additional branch is separated from the main branch, and a second coupling gap is formed between the second additional branch and the first extension branch. The band rejection filter is configured to improve the isolation between the first antenna and the second antenna.

主权项

1. An antenna system, comprising:
a first antenna; a second antenna; a band rejection filter, substantially disposed between the first antenna and the second antenna, wherein the band rejection filter comprises:
a protruded ground element;a main branch, coupled to the protruded ground element, wherein the main branch substantially has a T-shape;a first extension branch, coupled to the main branch;a first additional branch, separated from the main branch, wherein a first coupling gap is formed between the first additional branch and the main branch; anda second additional branch, separated from the main branch, wherein a second coupling gap is formed between the second additional branch and the first extension branch; and a dielectric substrate, wherein the first antenna, the second antenna, and the band rejection filter are disposed on the dielectric substrate.