Abstract: A communication system with a first input port and a second input port includes a first antenna, a second antenna, a first diplexer, a second diplexer, a third diplexer, a fourth diplexer, a first coupler, and a second coupler. The first diplexer has a common terminal coupled to the first input port. The second diplexer has a common terminal coupled to the second input port. The third diplexer has a common terminal coupled to the first antenna. The fourth diplexer has a common terminal coupled to the second antenna. Each of the first diplexer, the second diplexer, the third diplexer, and the fourth diplexer has a first terminal and a second terminal which are coupled between the first coupler and the second coupler.

Abstract: An antenna structure includes a main radiation element, a first feeding element, a first additional radiation element, a dielectric substrate, and a ground plane. A first signal source is coupled through the first feeding element to a first side of the main radiation element. The first additional radiation element is coupled to a second side of the main radiation element. A first slot is formed between the first additional radiation element and the main radiation element. The second side is different from the first side. The dielectric substrate has a first surface and a second surface which are opposite to each other. The main radiation element, the first feeding element, and the first additional radiation element are disposed on the first surface of the dielectric substrate. The ground plane is adjacent to the second surface of the dielectric substrate.

Abstract: An antenna structure includes a signal source, four transmission lines, and four radiation elements. The radiation elements are coupled through the transmission lines to the signal source, respectively. Each of the radiation elements includes a loop structure, a first connection element, and a second connection element. The loop structure has a first inner edge and a second inner edge which are opposite to each other. A looped region is formed between the first inner edge and the second inner edge. The looped region has first and second sides. The first connection element extends across the first side of the looped region. The first connection element is coupled between the first inner edge and the second inner edge. The second connection element extends across the second side of the looped region. The second connection element is coupled between the first inner edge and the second inner edge.

Abstract: An antenna system includes a dielectric substrate, a first dipole antenna element, a second dipole antenna element, a first additional metal element, a second additional metal element, first conductive via elements, and second conductive via elements. The first dipole antenna element and the first additional metal element are disposed on a first surface of the dielectric substrate. The first dipole antenna element includes a first radiation element and a second radiation element. The second dipole antenna element and the second additional metal element are disposed on a second surface of the dielectric substrate. The second dipole antenna element includes a third radiation element and a fourth radiation element. The first additional metal element is coupled through the first conductive via elements to the third radiation element. The second additional metal element is coupled through the second conductive via elements to the first radiation element.

Abstract: A communication device includes a nonconductive housing, a cable, an antenna structure, and a signal source. The nonconductive housing has a hollow structure. The cable is coupled to the signal source. The cable includes a signaling conductor and a grounding conductor. The antenna structure includes an antenna body and an enclosed radiation element. The antenna body is coupled to the signaling conductor. The antenna body is disposed outside the nonconductive housing. The enclosed radiation element is coupled to the grounding conductor. The enclosed radiation element is disposed inside the nonconductive housing.

Abstract: An antenna structure includes a first feeding element, a second feeding element, a balun structure, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, a sixth radiation element, and a dielectric substrate. The balun structure includes a central ground element, a first connection element, a second connection element, a third connection element, and a fourth connection element. The first connection element and the third connection element partially surround the central ground element. A first coupling gap is formed between the fifth radiation element and the first radiation element. A second coupling gap is formed between the fifth radiation element and the third radiation element. A third coupling gap is formed between the sixth radiation element and the second radiation element. A fourth coupling gap is formed between the sixth radiation element and the fourth radiation element.

Abstract: A communication system with a first input port and a second input port includes a first antenna, a second antenna, a first diplexer, a second diplexer, a third diplexer, a fourth diplexer, a first coupler, and a second coupler. The first diplexer has a common terminal coupled to the first input port. The second diplexer has a common terminal coupled to the second input port. The third diplexer has a common terminal coupled to the first antenna. The fourth diplexer has a common terminal coupled to the second antenna. Each of the first diplexer, the second diplexer, the third diplexer, and the fourth diplexer has a first terminal and a second terminal which are coupled between the first coupler and the second coupler.

Abstract: An antenna system includes a dielectric substrate, a first dipole antenna element, a second dipole antenna element, a first additional metal element, a second additional metal element, first conductive via elements, and second conductive via elements. The first dipole antenna element and the first additional metal element are disposed on a first surface of the dielectric substrate. The first dipole antenna element includes a first radiation element and a second radiation element. The second dipole antenna element and the second additional metal element are disposed on a second surface of the dielectric substrate. The second dipole antenna element includes a third radiation element and a fourth radiation element. The first additional metal element is coupled through the first conductive via elements to the third radiation element. The second additional metal element is coupled through the second conductive via elements to the first radiation element.

Abstract: An antenna structure includes a first feeding element, a second feeding element, a balun structure, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, a sixth radiation element, and a dielectric substrate. The balun structure includes a central ground element, a first connection element, a second connection element, a third connection element, and a fourth connection element. The first connection element and the third connection element partially surround the central ground element. A first coupling gap is formed between the fifth radiation element and the first radiation element. A second coupling gap is formed between the fifth radiation element and the third radiation element. A third coupling gap is formed between the sixth radiation element and the second radiation element. A fourth coupling gap is formed between the sixth radiation element and the fourth radiation element.

Abstract: A communication device includes a nonconductive housing, a cable, an antenna structure, and a signal source. The nonconductive housing has a hollow structure. The cable is coupled to the signal source. The cable includes a signaling conductor and a grounding conductor. The antenna structure includes an antenna body and an enclosed radiation element. The antenna body is coupled to the signaling conductor. The antenna body is disposed outside the nonconductive housing. The enclosed radiation element is coupled to the grounding conductor. The enclosed radiation element is disposed inside the nonconductive housing.

Abstract: An antenna structure includes a ground plane, a dielectric substrate, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. The first radiation element is coupled to a signal source. Both the third radiation element and the fourth radiation element are coupled between the first radiation element and the second radiation element. The third radiation element has a first notch and a second notch. The fourth radiation element has a third notch and a fourth notch. A loop structure is formed by the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element. A fifth notch is formed between the first radiation element and the third radiation element. A sixth notch is formed between the first radiation element and the fourth radiation element.

Abstract: An antenna structure includes a ground plane, a dielectric substrate, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. The first radiation element is coupled to a signal source. Both the third radiation element and the fourth radiation element are coupled between the first radiation element and the second radiation element. The third radiation element has a first notch and a second notch. The fourth radiation element has a third notch and a fourth notch. A loop structure is formed by the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element. A fifth notch is formed between the first radiation element and the third radiation element. A sixth notch is formed between the first radiation element and the fourth radiation element.

Abstract: An antenna structure includes a signal source, four transmission lines, and four radiation elements. The radiation elements are coupled through the transmission lines to the signal source, respectively. Each of the radiation elements includes a loop structure, a first connection element, and a second connection element. The loop structure has a first inner edge and a second inner edge which are opposite to each other. A looped region is formed between the first inner edge and the second inner edge. The looped region has first and second sides. The first connection element extends across the first side of the looped region. The first connection element is coupled between the first inner edge and the second inner edge. The second connection element extends across the second side of the looped region. The second connection element is coupled between the first inner edge and the second inner edge.

Abstract: A sliding variable resistor includes a sliding base, a first supporting pole, two buffering members, a substrate, a casing assembly, an anchoring plate, a driving member, a driven member, a belt, and a belt guard. The sliding base includes two first through hole and at least one variable resistor sheet. The first supporting pole is inserted into the two first through hole. The first supporting pole has its two ends abut against the first buffering seats, respectively. The substrate is engaged with the two buffering members. The two buffering members are arranged in the casing assembly. The anchoring plate is fixedly arranged on the casing assembly. The belt is engaged with the driving member and the driven member, respectively. The belt guard is fastened to the sliding base, and is engaged with the belt. As such, the sliding base, while sliding, can have an improved smoothness.

Abstract: An optical lens includes seven lenses. An first lens has a negative refractive power: an second lens, an third lens, an fifth lens, an sixth lens and an seventh lens have refractive powers respectively, and the fourth lens has a positive refractive power. One of the second lens and the third lens has a positive refractive power, and the other has a negative refractive power. One of the fifth lens and the sixth lens has a positive refractive power and the other has a negative refractive power. An object-side surface of the first lens has a refractive rate R1, an image-side surface of the first lens has a refractive rate R2, and |R2/R1|?0.01.

Abstract: A sliding variable resistor includes a sliding base, a first supporting pole, two buffering members, a substrate, a casing assembly, an anchoring plate, a driving member, a driven member, a belt, and a belt guard. The sliding base includes two first through hole and at least one variable resistor sheet. The first supporting pole is inserted into the two first through hole. The first supporting pole has its two ends abut against the first buffering seats, respectively. The substrate is engaged with the two buffering members. The two buffering members are arranged in the casing assembly. The anchoring plate is fixedly arranged on the casing assembly. The belt is engaged with the driving member and the driven member, respectively. The belt guard is fastened to the sliding base, and is engaged with the belt. As such, the sliding base, while sliding, can have an improved smoothness.

Abstract: An optical lens includes seven lenses. An first lens has a negative refractive power: an second lens, an third lens, an fifth lens, an sixth lens and an seventh lens have refractive powers respectively, and the fourth lens has a positive refractive power. One of the second lens and the third lens has a positive refractive power, and the other has a negative refractive power. One of the fifth lens and the sixth lens has a positive refractive power and the other has a negative refractive power. An object-side surface of the first lens has a refractive rate R1, an image-side surface of the first lens has a refractive rate R2, and |R2/R1|?0.

Abstract: A read/write test method for handheld electronic product is introduced. The handheld electronic product is connected to a storage device and is equipped with an open platform having a data read/write test program installed thereon. In the read/write test method, the following steps are repeatedly executed according to a default test condition: the data read/write test program sends out a first test command to write a test data file into the storage device; the data read/write test program sends out a second test command to execute closing, opening and reading of the test data file; and the data read/write test program, upon confirmation of successful reading of the test data file, sends out a third test command to execute cutting, pasting, copying, and deleting of the test data file. Upon completion of the above steps, test results from each of the steps are output for a test operator to analyze.

Abstract: A method for testing a handheld electronic device installed with an open operating platform including a first testing instruction and a second testing instruction includes sending the first testing instruction to the handheld electronic device to switch the handheld electronic device from a high power consumption state to a low power consumption state; sending the second testing instruction to the handheld electronic device to switch the handheld electronic device from the low power consumption state to the high power consumption state; and executing the first testing instruction and the second testing instruction repeatedly in a loop based on a predetermined test duration and test count, such that tests performed on the handheld electronic device are precise and stable.

Abstract: A method for testing handheld electronic device is for use in testing the power consumption level of a handheld electronic device equipped with an open operating platform. The method involves configuring, in the open operating platform, a radio communication unit and a display unit of the handheld electronic device; configuring the radio communication unit such that the radio communication unit can receive a data signal; adjusting controllably brightness of the display unit; and comparing, after a predetermined time period of control, an initial power level and a current power level of a battery in the handheld electronic device to evaluate power consumption of the handheld electronic device.