Abstract: The present invention is to provide a PCB based band-pass filter for cutting out harmonic of high frequency wherein in manufacturing a circuit board of a wireless communication product technology of PCB production is utilized to mount an input microstrip line, an output microstrip line, an open circuit microstrip line, and a short circuit microstrip line of the band-pass filter on the circuit board. By utilizing the present invention, it is possible of utilizing an unoccupied area of the circuit board to mount a band-pass filter thereon without using an additional filter of high frequency. Moreover, the band-pass filter is adapted to cut out harmonic of two, three, or four times of a fundamental frequency caused by nonlinear distortion of a power amplifier of the wireless communication product.

Abstract: The present invention is to provide a PCB based band-pass filter for cutting out harmonic of high frequency wherein in manufacturing a circuit board of a wireless communication product technology of PCB production is utilized to mount an input microstrip line, an output microstrip line, an open circuit microstrip line, and a short circuit microstrip line of the band-pass filter on the circuit board. By utilizing the present invention, it is possible of utilizing an unoccupied area of the circuit board to mount a band-pass filter thereon without using an additional filter of high frequency. Moreover, the band-pass filter is adapted to cut out harmonic of two, three, or four times of a fundamental frequency caused by nonlinear distortion of a power amplifier of the wireless communication product.

Abstract: The present invention discloses a dual-frequency antenna, wherein a coplanar wave guide wire is printed onto a dielectric substrate, so that an end of the coplanar wave guide wire can be used as a signal input end, and a ground metal surface is printed onto the same side of the dielectric substrate at a position corresponding to the periphery of the coplanar wave guide wire. The ground metal surface keeps a certain distance from the coplanar wave guide wire, and the other end of the coplanar wave guide wire is extended outside the ground metal surface. A radiating member is extended from a side along the direction of the longitudinal axis, and a meandered conductive wire is extended from the other side at the end of the longitudinal axis. The radiating member is parallel to the conductive wire, and a gap is kept in parallel to the edge of the ground metal surface, so that each radiating member can be used to receive signals of different frequencies.

Abstract: The present invention discloses a dual-frequency antenna, wherein a coplanar wave guide wire is printed onto a dielectric substrate, so that an end of the coplanar wave guide wire can be used as a signal input end, and a ground metal surface is printed onto the same side of the dielectric substrate at a position corresponding to the periphery of the coplanar wave guide wire. The ground metal surface keeps a certain distance from the coplanar wave guide wire, and the other end of the coplanar wave guide wire is extended outside the ground metal surface. A radiating member is extended from a side along the direction of the longitudinal axis, and a meandered conductive wire is extended from the other side at the end of the longitudinal axis. The radiating member is parallel to the conductive wire, and a gap is kept in parallel to the edge of the ground metal surface, so that each radiating member can be used to receive signals of different frequencies.

Abstract: The present invention discloses a miniature monopole antenna for dual-frequency printed circuit board, which individually prints a printed wire, two radiators, and a metal grounding surface on a dielectric printed wire board to form a monopole antenna. Therefore, the antenna can be operated within the dual-frequency range as specified by the IEEE 802.11a protocol and the IEEE 802.11b protocol. The monopole antenna designed in this invention not only can receive dual-frequency signals, but also can reduce the occupying volume to about one half of that of the traditional inverted L-shaped monopole antenna, which can effectively reduce the volume of the wireless communication products and comply with the trend of the compact design.

Abstract: A planar L-shaped antenna. The antenna is operable at two different frequency ranges and includes a patch line printed on top of a dielectric substrate and has one end formed as a signal feed point. A ground metal plate is printed on a bottom of the dielectric substrate. First and second radiating elements extend oppositely from another end of the patch line. The first and second radiating elements are perpendicular to the patch line and disposed above and beyond the ground metal plate for receiving signals having different frequencies respectively.

Abstract: The present invention discloses a low-cost coaxial cable fed inverted-L antenna with a structure using only one coaxial cable and extending an internal conductor outside one end of the coaxial cable to a predetermined length outside an external conductor on the other end, and then bending the coaxial cable backward in an opposite direction along the external conductor and parallel to the direction of the external conductor to extend to a predetermined length outside to define a radiating member, which doesn't require additional components or any other manufacturing procedure, and will greatly lower the production and manufacturing costs of the antenna and improve the yield rate of production.

Abstract: This invention is to provide a planar monopole antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; a first radiating element extended from the other end of the patch line beyond the ground metal plate and being perpendicular to the patch line and then further extended a predetermined distance in a direction parallel to the patch line toward and spaced apart from the ground metal plate; and a second radiating element operated at a high frequency projected from a side of the patch line beyond the ground metal plate and spaced apart from the first radiating element operated at a low frequency.

Abstract: This invention is to provide a planar monopole antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; a first radiating element extended from the other end of the patch line beyond the ground metal plate and being perpendicular to the patch line and then further extended a predetermined distance in a direction parallel to the patch line toward and spaced apart from the ground metal plate; and a second radiating element operated at a high frequency projected from a side of the patch line beyond the ground metal plate and spaced apart from the first radiating element operated at a low frequency.

Abstract: The present invention is to provide a planar double L-shaped antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; a first radiating element formed at the other end of the patch line and extended in a direction perpendicular to the patch line above and beyond the ground metal plate to shape as an inverted L shape; and a second radiating element extended beyond the ground metal plate to shape as an inverted L shape and spaced apart from the first radiating element, so that the first and the second radiating elements are capable of receiving signals having different frequencies.

Abstract: The present invention is to provide a planar L-shaped antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; first and second radiating elements extended oppositely from the other end of the patch line, wherein the first and second radiating elements being perpendicular to the patch line and disposed above and beyond the ground metal plate for receiving signals having different frequencies respectively.

Abstract: The present invention is to provide a planar double L-shaped antenna operable at two different frequency ranges comprising a patch line printed on a top of a dielectric substrate and having one end formed as a signal feed point; a ground metal plate printed on a bottom of the dielectric substrate; a first radiating element formed at the other end of the patch line and extended in a direction perpendicular to the patch line above and beyond the ground metal plate to shape as an inverted L shape; and a second radiating element extended beyond the ground metal plate to shape as an inverted L shape and spaced apart from the first radiating element, so that the first and the second radiating elements are capable of receiving signals having different frequencies.

Abstract: The present invention is to provide a patch horn antenna of dual frequency formed on a printed circuit board of a wireless electronic product, in which the horn antenna is formed on one side of the print circuit board, a first patch line is formed on the other side of the printed circuit board as a feed transmission line thereof by means of signal wave coupling, and a second patch line being extended from an opening of the horn antenna at one oblique side toward the other oblique side of the opening for effectively controlling the ranges of the frequency bands to obtain a good match between high and low frequency bands via adjusting the size of the second patch line the degree of the angle between two oblique sides of the opening or the coupling area of the first patch line.

Abstract: The present invention is to provide a patch antenna including a patch and a ground plane printed on top and bottom surfaces of a dielectric substrate respectively, wherein the patch has a size smaller than that of the dielectric substrate and has a patch line extended from a center of a side of the patch to an edge of the dielectric substrate for serving as a signal wave feed line thereof, and a gap provided at one side of the patch line to separate the patch line from the patch for forming a circuitous current path from one edge of the patch line along the sides adjacent the gap to one side of the patch to significantly reduce inductance generated by signal wave and increase an effective bandwidth thereof.