The invention discloses a radio frequency (RF) matching device for a tire pressure sensor, which includes a system control unit, a RF control unit, a RF matching unit, and a multi-frequency antenna in order, wherein the RF matching unit includes a resonance portion, a filtering portion, and a matching portion in order, wherein the resonance unit is connected to the RF control unit to be adjusted to the required initial frequency and cut-off frequency of various frequency bands; the filter unit is connected between the resonance unit and the matching unit to suppress and eliminate noise and unwanted frequency-doubling signals; the matching unit allows the maximum power of the multi-frequency RF signal to be transferred to the multi-frequency antenna, so that the multi-frequency antenna can transmit multiple RF signals of different frequencies.

The invention discloses a radio frequency (RF) matching device for a tire pressure sensor, which includes a system control unit, a RF control unit, a RF matching unit, and a multi-frequency antenna in order, wherein the RF matching unit includes a resonance portion, a filtering portion, and a matching portion in order, wherein the resonance unit is connected to the RF control unit to be adjusted to the required initial frequency and cut-off frequency of various frequency bands; the filter unit is connected between the resonance unit and the matching unit to suppress and eliminate noise and unwanted frequency-doubling signals; the matching unit allows the maximum power of the multi-frequency RF signal to be transferred to the multi-frequency antenna, so that the multi-frequency antenna can transmit multiple RF signals of different frequencies.

A communication device is provided. The communication device comprises a metal back cover electrically connected to a system ground plane; a first antenna unit for generating a first operating frequency band of the communication device; a second antenna unit for generating a second operating frequency band of the communication device. The first antenna unit includes a first signal source electrically connected to a first metal frame via a first matching circuit. The second antenna unit includes a second signal source electrically connected to a second metal frame via a second matching circuit. The first matching circuit and the second matching circuit are configured to adjust bandwidths and frequency ratios of the first operating frequency band and the second operating frequency band.

A communication device is provided. The communication device comprises a metal back cover electrically connected to a system ground plane; a first antenna unit for generating a first operating frequency band of the communication device; a second antenna unit for generating a second operating frequency band of the communication device. The first antenna unit includes a first signal source electrically connected to a first metal frame via a first matching circuit. The second antenna unit includes a second signal source electrically connected to a second metal frame via a second matching circuit. The first matching circuit and the second matching circuit are configured to adjust bandwidths and frequency ratios of the first operating frequency band and the second operating frequency band.

An antenna structure utilizing as radiating elements only the metal frame of an electronic device includes a metal frame, a feeding portion, and a ground point. The metal frame defines a first gap and a second gap. The metal frame forms a radiating portion, a first coupling portion, and a second coupling portion through the first gap and the second gap. When the feed supplies current, the current flows through the radiating portion and, being coupled to the first coupling portion and second coupling portion through the first and second gaps, first, second, and third operating modes at different frequencies can be invoked to generate wireless signals in first, second, and third LTE-A frequency bands.

An antenna structure utilizing as radiating elements only the metal frame of an electronic device includes a metal frame, a feeding portion, and a ground point. The metal frame defines a first gap and a second gap. The metal frame forms a radiating portion, a first coupling portion, and a second coupling portion through the first gap and the second gap. When the feed supplies current, the current flows through the radiating portion and, being coupled to the first coupling portion and second coupling portion through the first and second gaps, first, second, and third operating modes at different frequencies can be invoked to generate wireless signals in first, second, and third LTE-A frequency bands.

An antenna structure includes: an antenna array and a radio frequency component; and a radio frequency transfer switch, wherein the radio frequency transfer switch is connected with the antenna array and the radio frequency component, a number of the antenna array connected with the radio frequency transfer switch is greater than a number of the radio frequency component connected with the radio frequency transfer switch, the radio frequency transfer switch is configured to switch a feed object of at least one radio frequency component connected therewith, and the feed object is any antenna array connected therewith.

An antenna structure includes: an antenna array and a radio frequency component; and a radio frequency transfer switch, wherein the radio frequency transfer switch is connected with the antenna array and the radio frequency component, a number of the antenna array connected with the radio frequency transfer switch is greater than a number of the radio frequency component connected with the radio frequency transfer switch, the radio frequency transfer switch is configured to switch a feed object of at least one radio frequency component connected therewith, and the feed object is any antenna array connected therewith.

A conductor pattern of an antenna device is provided in a notch and includes a common conductor, a first conductor, and a second conductor. A power supply unit is disposed at a connection portion between a conductor plate and the conductor pattern. Each of the first conductor and the second conductor is connected to the power supply unit with the common conductor interposed therebetween. The power supply unit is positioned at a position at which a distance to an opening end is shorter than a distance to a closed end at a side end. A first partial conductor of the first conductor is positioned between the second conductor and a side end. A length of the first conductor in a direction along the side end is longer than a length of the second conductor in the direction along the side end.

A conductor pattern of an antenna device is provided in a notch and includes a common conductor, a first conductor, and a second conductor. A power supply unit is disposed at a connection portion between a conductor plate and the conductor pattern. Each of the first conductor and the second conductor is connected to the power supply unit with the common conductor interposed therebetween. The power supply unit is positioned at a position at which a distance to an opening end is shorter than a distance to a closed end at a side end. A first partial conductor of the first conductor is positioned between the second conductor and a side end. A length of the first conductor in a direction along the side end is longer than a length of the second conductor in the direction along the side end.