ANTENNA BANDWIDTH EXPANDER

摘要

Disclosed is an antenna bandwidth expander capable of improving transmission/reception performance of a wireless communication device by expanding a bandwidth of an antenna in which broadband frequency characteristics including various communication bands are necessary like an LTE smartphone. The antenna bandwidth expander may improve the transmission and reception performance of a terminal by easily and conveniently expanding a bandwidth of an antenna in first and second resonant frequency bands.

主权项

1. An antenna bandwidth expander mounted between an RF system and an antenna to be electrically connected thereto in a circuit board, the antenna bandwidth expander comprising:
a first conduction terminal electrically connected to the antenna; a second conduction terminal electrically connected via the first conduction terminal and a first capacitor; a first coil electrically connected between the first and second conduction terminals; a third conduction terminal electrically connected to an output port of the RF system; a fourth conduction terminal electrically connected via the third conduction terminal and a second capacitor; a second coil electrically connected between the third and fourth conduction terminals; and third and fourth capacitors respectively disposed between the second and third conduction terminals and between the first and fourth conduction terminals, wherein the second and fourth capacitors respectively connected to the second coil in parallel and in serial to form a resonant circuit in a first frequency band that is a low frequency band, and the first and third capacitors respectively connected to the first coil in parallel and in serial to form a resonant circuit in a second frequency band that is a high frequency band, and wherein the first and second coils are wound in opposite directions to be magnetically coupled.