An antenna system includes collocated active steering antennas implemented in a bottom portion of a wireless communication device designed for positioning near a user's mouth or chin. The co-located active steering antennas are each configured to steer a radiation pattern of the respective antenna, and can be further configured for active band switching and/or active impedance matching. These co-located active steering antennas can be used independently, or in a multi-input multi-output (MIMO) configuration. In addition, the antenna system is capable of antenna unit selectivity, which includes the ability to select one of the co-located antennas with the lowest head and hand loss for use, while disabling the antenna with the highest loss attributed to hand head loading.

A reconfigurable array antenna and system for including the same are described. In one embodiment, the antenna apparatus comprises a feeding network and an array coupled to the feeding network, wherein the array has a plurality of locations, with each location capable of having an antenna element attached thereto, and wherein the feeding network is operable to combine energy received by antenna elements in the array, and the energy is combined by the feeding network in RF.

A reconfigurable array antenna and system for including the same are described. In one embodiment, the antenna apparatus comprises a feeding network and an array coupled to the feeding network, wherein the array has a plurality of locations, with each location capable of having an antenna element attached thereto, and wherein the feeding network is operable to combine energy received by antenna elements in the array, and the energy is combined by the feeding network in RF.

To provide a compact antenna capable of corresponding to a plurality of frequency bands. In a first frequency characteristic adjustment unit, the susceptance thereof varies according to a frequency of an input signal. A second frequency characteristic adjustment unit is connected to the first frequency characteristic adjustment unit and the reactance thereof varies according to the frequency of the input signal. A third frequency characteristic adjustment unit is connected to the second frequency characteristic adjustment unit, the susceptance thereof varies according to the frequency of the input signal. A feeding unit is configured to input a signal of any frequency in a plurality of different frequencies to the second frequency characteristic adjustment unit. A sign of the reactance of the second frequency characteristic adjustment unit at the frequency of the signal input from the feeding unit is the same as those of the susceptances of the first frequency characteristic adjustment unit and the third frequency characteristic adjustment unit.

To provide a compact antenna capable of corresponding to a plurality of frequency bands. In a first frequency characteristic adjustment unit, the susceptance thereof varies according to a frequency of an input signal. A second frequency characteristic adjustment unit is connected to the first frequency characteristic adjustment unit and the reactance thereof varies according to the frequency of the input signal. A third frequency characteristic adjustment unit is connected to the second frequency characteristic adjustment unit, the susceptance thereof varies according to the frequency of the input signal. A feeding unit is configured to input a signal of any frequency in a plurality of different frequencies to the second frequency characteristic adjustment unit. A sign of the reactance of the second frequency characteristic adjustment unit at the frequency of the signal input from the feeding unit is the same as those of the susceptances of the first frequency characteristic adjustment unit and the third frequency characteristic adjustment unit.

An antenna device includes a slot, a connecting assembly, a first capacitor, a first match circuit, an antenna and a second match circuit. The slot is defined in a shell of the mobile terminal. The slot separates the shell into a first part and a second part. The first part is configured to couple with a mainboard via a first feeding point to form a slot antenna. The connecting assembly connects the first part with the second part. The first capacitor couples the first part and the first feeding point. The first match circuit couples the first capacitor and the first feeding point. The antenna is configured to send a signal through the slot. The antenna is disposed above the mainboard and below the slot and the antenna couples with the mainboard via a second feeding point.

An antenna device includes a slot, a connecting assembly, a first capacitor, a first match circuit, an antenna and a second match circuit. The slot is defined in a shell of the mobile terminal. The slot separates the shell into a first part and a second part. The first part is configured to couple with a mainboard via a first feeding point to form a slot antenna. The connecting assembly connects the first part with the second part. The first capacitor couples the first part and the first feeding point. The first match circuit couples the first capacitor and the first feeding point. The antenna is configured to send a signal through the slot. The antenna is disposed above the mainboard and below the slot and the antenna couples with the mainboard via a second feeding point.

Antenna structures and methods of operating the same are described. One apparatus includes a radio frequency (RF) circuitry, a housing, an antenna structure, and multi-connector switching circuitry. The RF circuitry includes a first RF feed for a first frequency and a second RF feed for a second frequency. The housing includes a first strip element disposed at a periphery of the housing, where the first strip element is physically separated from the housing by a first cutout in the housing. The antenna structure includes the first strip element coupled to a first multi-connector switching circuitry by a first connector and a second connector. The first multi-connector switching circuitry coupled to the first RF feed and the second RF feed where the first switching circuit to connect the first strip element to the first RF feed in a first mode of the first multi-connector switching circuitry.

A signal input circuit applied to an antenna comprises a balun transformer and a regulation circuit. The balun transformer has one first signal input terminal and two first signal output terminals. The balun transformer receives a feed signal and a ground signal via the first signal input terminal, generates two balanced signals based on the feed signal and the ground signal, and respectively outputs the two balanced signals via the two first signal output terminals. The regulation circuit is configured to adjust the two balanced signals into adjusted signals and has two second signal input terminals and two second signal output terminals, with the two second signal input terminals respectively connected with the two first signal output terminals of the balun transformer, and the two second signal output terminals configured to respectively output the two adjusted signals to an emitting portion of the antenna.

A signal input circuit applied to an antenna comprises a balun transformer and a regulation circuit. The balun transformer has one first signal input terminal and two first signal output terminals. The balun transformer receives a feed signal and a ground signal via the first signal input terminal, generates two balanced signals based on the feed signal and the ground signal, and respectively outputs the two balanced signals via the two first signal output terminals. The regulation circuit is configured to adjust the two balanced signals into adjusted signals and has two second signal input terminals and two second signal output terminals, with the two second signal input terminals respectively connected with the two first signal output terminals of the balun transformer, and the two second signal output terminals configured to respectively output the two adjusted signals to an emitting portion of the antenna.