Antenna bandwidth expander
AssigneesSun-Ki Kim, Joinset Co., Ltd.
InventorsJong-Cheol Yoon, Sun-Ki Kim, In-Yeup Song
Life of this patent
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Abstract
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.
Claims12
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.
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 ceramic body having first to fourth conduction terminals separately formed on a bottom surface and including therein a first coil electrically connected between the first and second conduction terminals and a second coil electrically connected between the third and fourth terminals;
- and
- first to fourth capacitors disposed between first to fourth conduction pads formed in correspondence to the first to fourth conduction terminals in the circuit board,
- wherein the first conduction terminal is electrically connected to the antenna, the third conduction terminal is electrically connected to an output port of the RF system, the second and fourth capacitors are respectively connected to the second coil in parallel and in serial to form a first resonant circuit in a first frequency band that is a low frequency band, and the first and third capacitors are 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.
An antenna bandwidth expander comprising:
- a first ceramic sheet having conduction terminals at four bottom corners and a ground or dummy terminal at a center;
- a second ceramic sheet having a first capacitor pattern formed thereon;
- a plurality of third ceramic sheets having the first capacitor pattern or a second capacitor pattern, and first and second coil patterns formed thereon;
- and
- a fourth ceramic sheet having the first capacitor pattern formed thereon,
- wherein the ceramic sheets are sequentially stacked, the first and second coil patterns are connected through via holes to form a coil and to be magnetically coupled, and the first and second capacitor patterns overlap to form a capacitor in the stacked state, and
- wherein the coil and the capacitor are electrically connected to the conduction terminal through a via hole.
An antenna bandwidth expander comprising:
- a first ceramic sheet having conduction terminals at four bottom corners and a ground or dummy terminal at a center;
- a second ceramic sheet having one connection pattern formed thereon;
- a plurality of ceramic sheets having first and second coil patterns formed thereon;
- and
- a fourth ceramic sheet having another connection pattern formed thereon,
- wherein the ceramic sheets are sequentially stacked and the first and second coil patterns are connected through respective via holes to form a coil and to be mutually magnetically coupled, and
- wherein the coil is electrically connected to the conduction terminal through the connection pattern and a via hole.
Dependencies are inferred from the claim text.