A system for downhole frequency re-tuning includes a receiver antenna, a receiver matching network, a transmitter antenna, the transmitter antenna outputting a signal that is received at the receiver antenna, a transmitter matching network, a power amplifier providing operational power to the transmitter antenna, and a frequency sweeping system. The frequency sweeping system includes an oscillator, coupled to the power amplifier, the oscillator providing an input signal to the power amplifier to adjust power output to the transmitter antenna. The system also includes a circulator, positioned between the power amplifier and the transmitter matching network, the circulator directing the operational power to the transmitter antenna. The system further includes a reflected power meter, coupled to the circulator, the reflected power meter receiving reflected power at the transmitter antenna responsive to receiver antenna. The system also includes a control module.

An antenna arrangement for a communication device comprises a top conductive patch comprising at least a first coupling point and a second coupling point coupled to one or more feed circuits carrying a radio frequency (RF) signal to or from the top conductive patch. The RF signal has a first phase in the first coupling point and a second phase in the second coupling point. A first slot extends in the conductive patch between the first coupling point and the second coupling point. The antenna arrangement according enables a desired current distribution to be realized in the antenna in a controlled and systematic manner. A communication device includes such an antenna arrangement.

An antenna device includes: a first antenna having a directional gain at a low elevation angle higher than the directional gain at a high elevation angle; a second antenna having the directional gain at the high elevation angle higher than the first antenna, transmitting and receiving a radio wave having a vibration direction of an electric field intersecting with a radio wave transmitted and received by the first antenna; and a third antenna having the directional gain at the high elevation angle higher than the first antenna, and transmitting and receiving a radio wave having a vibration direction of an electric field intersecting with the radio wave transmitted and received by the second antenna.

Reconfigurable patch antenna systems are provided herein. In certain embodiments, a mobile device includes a patch antenna configured to handle a radio frequency signal at a signal feed. The patch antenna includes a plurality of antenna segments. The front-end system further includes a plurality of switches each configured to control connection of a respective one of the first plurality of antenna segments to the first signal feed, and a control circuit configured to control the plurality of switches to provide a frequency adjustment to the patch antenna.

An antenna structure includes a patch antenna including two opposite edges, a microstrip line connected to the patch antenna, two first radiation assemblies respectively disposed on two sides of the patch antenna, two second radiation assemblies disposed under the two first radiation assemblies, a liquid crystal layer disposed between a first plane and a second plane, and a ground plane disposed under the two second radiation assemblies. The patch antenna, the microstrip line, and the two first radiation assemblies are located on the first plane, and each of the first radiation assemblies includes multiple separated first conductors. The two second radiation assemblies are located on the second plane, and each of the second radiation assemblies includes multiple separated second conductors. A projection of the two second radiation assemblies on the first plane, the two first radiation assemblies, and the two edges of the patch antenna collectively form two loops.

An electronic device includes at least one processor, a first antenna comprises a first conductive patch disposed on a first layer, a first transmission line disposed on the first layer and electrically connected to one point of the first conductive patch, a ground disposed on a second layer and a dielectric disposed on a third layer between the first layer and the second layer, the first conductive patch has a shape of a rectangle in which a first corner portion of the rectangle and a second corner portion of the rectangle are removed, and the at least one processor transmits and/or receives at least one of a first RF signal having a first polarization characteristic and a second RF signal having a second polarization characteristic.

An electronic device and an antenna structure thereof are provided. The antenna structure includes a first radiating member, a feeding member disposed on the first radiating member, a second radiating member, and a grounding member. A first predetermined gap is between the feeding member and the first radiating member. The feeding member, the first predetermined gap, and the first radiating member resonate to generate a low frequency band and a high frequency band. The second radiating member including a main body and a grounding part is disposed on the first radiating member. A second predetermined gap is between the main body and the first radiating member. The grounding part, the main body, and the second predetermined gap resonate to increase a bandwidth of the low frequency band. The grounding member is disposed on the first radiating member and electrically connected to the grounding part.

An antenna device according to an embodiment includes a dielectric layer, a rhombus-shaped first radiator disposed on an upper surface of the dielectric layer, a transmission line connected to the first radiator, a signal pad connected to one end of the transmission line, ground pads disposed around the signal pad, and second radiators extending from the ground pad along lower sides of the first radiator.

An electronic device may include a millimeter wave antenna having a ground plane, resonating element, feed, and parasitic element. The resonating element may include first, second, and third layer of traces that are shorted together. The second traces may be interposed between the first and third traces and the third traces may be interposed between the second traces and the parasitic. The third traces may have a width that is less than the widths of the second and third traces. The third traces and the parasitic may define a constrained volume having an associated cavity resonance that lies outside of a frequency band of interest. If desired, the resonating element may include a single layer of conductive traces having a grid of openings that disrupt impedance in a transverse direction, thereby mitigating the trapping of energy within the frequency band of interest between the resonating element and the parasitic.

A method for manufacturing a liquid-crystal antenna device is provided. The method includes step (a) providing a first mother substrate. The first mother substrate includes a first region and a second region. The first region has a plurality of first sides. An extension line of at least one of the first sides divides the second region into a first part and a second part. The method also includes the following steps: (b) forming a first electrode layer on the first region and the second region, and (c) cutting the first mother substrate along the first sides of the first region.