Abstract: An electronic device includes an antenna, an RF circuit, and a matching circuit. The matching circuit is configured to provide variable impedance between the antenna and the RF circuit, wherein the matching circuit includes a first element having a first terminal and a second terminal, and wherein the first terminal is coupled to the antenna; a second element having a third terminal connected to the second terminal of the first element and a fourth terminal coupled to the RF circuit; a first tuning cell connected to the second terminal of the first element and the third terminal of the second element, and comprising a first tuning element, a second tuning element and a first control element, wherein the first control element determines whether to make a first node connected between the first and second tuning elements couple to a voltage level.

Abstract: A stacked antenna includes a first dielectric substrate, a second dielectric substrate, at least one vertical conductive structure, at least one transmission line structure, a driven element, at least one reflector and a director. The second dielectric substrate is stacked on the first dielectric substrate. The conductive structure penetrates the first dielectric substrate or the second dielectric substrate. The transmission line structure is disposed between the first and second dielectric substrates. The driven element is disposed between the first and second dielectric substrates and is electrically connected to the conductive structure through the transmission line structure. The reflector is spaced from the driven element by the first dielectric substrate and is disposed under the first dielectric substrate. The director is spaced from the driven element by the second dielectric substrate.

Abstract: A stacked antenna includes a first dielectric substrate, a second dielectric substrate, at least one vertical conductive structure, at least one transmission line structure, a driven element, at least one reflector and a director. The second dielectric substrate is stacked on the first dielectric substrate. The conductive structure penetrates the first dielectric substrate or the second dielectric substrate. The transmission line structure is disposed between the first and second dielectric substrates. The driven element is disposed between the first and second dielectric substrates and is electrically connected to the conductive structure through the transmission line structure. The reflector is spaced from the driven element by the first dielectric substrate and is disposed under the first dielectric substrate. The director is spaced from the driven element by the second dielectric substrate.

Abstract: A tunable impedance matching circuit is provided for matching a signal source to an impedance of an antenna. The tunable impedance matching circuit includes two terminals, a series path, and two shunt paths. The first terminal is coupled to the signal source, and the second terminal is coupled to the antenna. The series path is coupled between the first terminal and the second terminal and includes a first tunable capacitor and at least one tunable inductor. One of the two shunt paths is coupled between the first terminal and a ground end, and the other one of the two shunt paths is coupled between the second terminal and the ground end. Each of the shunt paths includes a second tunable capacitor.

Abstract: An electronic device includes an antenna, an RF circuit, and a matching circuit. The matching circuit is configured to provide variable impedance between the antenna and the RF circuit, wherein the matching circuit includes a first element having a first terminal and a second terminal, and wherein the first terminal is coupled to the antenna; a second element having a third terminal connected to the second terminal of the first element and a fourth terminal coupled to the RF circuit; a first tuning cell connected to the second terminal of the first element and the third terminal of the second element, and comprising a first tuning element, a second tuning element and a first control element, wherein the first control element determines whether to make a first node connected between the first and second tuning elements couple to a voltage level.

Abstract: A stacked antenna includes a first dielectric substrate, a second dielectric substrate, at least one vertical conductive structure, at least one transmission line structure, a driven element, at least one reflector and a director. The second dielectric substrate is stacked on the first dielectric substrate. The conductive structure penetrates the first dielectric substrate or the second dielectric substrate. The transmission line structure is disposed between the first and second dielectric substrates. The driven element is disposed between the first and second dielectric substrates and is electrically connected to the conductive structure through the transmission line structure. The reflector is spaced from the driven element by the first dielectric substrate and is disposed under the first dielectric substrate. The director is spaced from the driven element by the second dielectric substrate.