Abstract: The dipole antenna array is formed by connecting a plurality of dipole antennas, one end of the dipole antenna array has an open stub and a balancing circuit to adjust the width of frequency band, impedance and gain of the antenna array. Each dipole antenna is added on the two ends thereof with antenna loading devices such as a plurality of mini-aperture antennas. The dipole antenna array can have an option to add a reflector on an end thereof.

Abstract: A dual- or multi-frequency planar inverted F-antenna, wherein, a metal surface of the antenna matching the size and shape of the interior installation space of an equipment is installed on the top of a grounding surface, an open slot provided on the metal surface forms a common close end and an open end to thereby partitions the metal surface into a long section and a short section; a desired impedance matching between a short point and a feed point of the metal surface is obtained by adjusting positions of the short point and the feed point in pursuance of frequencies desired; the length of the long section from the short point to the open end of the open slot and the length from the short point to the end point of the short section are decided by dual- or multi-resonance frequencies in cooperating with the open slot which is deformed and curved.

Abstract: A structure of a helix antenna, wherein a non-uniform helical coil is press positioned between an inner insulating sleeve and an external insulating sleeve slipping one over the other, the coil is abutted respectively against the inner top surface of the external insulating sleeve and a metallic connecting seat of the inner insulating sleeve. A metallic contact piece is abutted against the metallic connecting seat, has a continuous bending portion exposed from a side slit on the inner insulating sleeve, and has a bottom end for press contacting an RF electric circuit of a communication instrument. The coil has on the top end a diametrically extending bent section to be an added loading of the antenna, the bottom end of the coil has a denser coil section positioned on the surface of the metallic connecting seat. The inner and external insulating sleeves have an external protruding annulus engaged with an inner annular recess for assembling the helical coil to have a fixed length.

Abstract: A structure of a helix antenna, wherein, a non-uniform helical coil is press positioned between an inner insulating sleeve and an external insulating sleeve slipping one over the other, the coil is abutted respectively against the inner top surface of the external insulating sleeve and a metallic connecting seat of the inner insulating sleeve; a metallic contact piece is abutted with one end thereof against the metallic connecting seat, and has on the other end a continuous bending portion exposed from a side slit on the inner insulating sleeve, and has a bottom end for press contacting an RF electric circuit of a communication instrument; the coil has on the top end thereof a diametrically extending bent section to be an added loading of the antenna, the bottom end of the coil has a denser coil section positioned on the surface of the metallic connecting seat; the inner and external insulating sleeves placed in the coil are provided at least a melting connecting area respectively comprised of and formed by e

Abstract: A multi-frequency hidden antenna for mobile phones, the electric circuit board of the antenna has on the front side thereof two separated grounding areas and an electric supplying line of a single-pole antenna of ¼&lgr;, the open circuit end of the electric supplying line is in the shape of an inverted triangle in a way to form a loaded coplanar waveguide antenna. The electric circuit board is further provided on the rear side thereof with a grounding area, while the electric supplying line on the front side thereof is provided with a short circuit portion of which harmonic oscillation frequency is adjustable in order to form a planar inverted F-antenna (PIFA) to be used together with said coplanar waveguide antenna. Thereby a multi-frequency hidden antenna is formed which can improve bandwidth, radiation efficiency and gain during making coplanar of and miniaturizing the hidden antenna.

Abstract: A hidden wideband antenna which is provided with an integrally shaped metal sheet, the metal sheet is provided with an open slot with a predetermined length on the main sheet thereof to partition it into a long section and a short section both of a partial wavelength respectively of multi-resonance frequencies, a signal feed-in contact piece and a grounding contact piece are provided at one corner of the main sheet by punching; an inwardly recessed section is provided along the long section to form a U-shape space, and a bent back section bent upwardly is provided at the outermost edge of the long section, the bent back section is provided with a protruding portion facing to the U-shape space of the inwardly recessed section to function as an open stub for adjusting the frequency matching and increasing the bandwidth of the hidden antenna.

Abstract: A hidden wideband antenna which is provided with an integrally shaped metal sheet, the metal sheet is provided with an open slot with a predetermined length on the main sheet thereof to partition it into a long section and a short section both of a partial wavelength respectively of multi-resonance frequencies, a signal feed-in contact piece and a grounding contact piece are provided at one corner of the main sheet by punching; an inwardly recessed section is provided along the long section to form a U-shape space, and a bent back section bent upwardly is provided at the outermost edge of the long section, the bent back section is provided with a protruding portion facing to the U-shape space of the inwardly recessed section to function as an open stub for adjusting the frequency matching and increasing the bandwidth of the hidden antenna.

Abstract: A multi-frequency hidden antenna for mobile phones, the electric circuit board of the antenna has on the front side thereof two separated grounding areas and an electric supplying line of a single-pole antenna of ¼ &lgr;, the open circuit end of the electric supplying line is in the shape of an inverted triangle in a way to form a loaded coplanar waveguide antenna. The electric circuit board is further provided on the rear side thereof with a grounding area, while the electric supplying line on the front side thereof is provided with a short circuit portion of which harmonic oscillation frequency is adjustable in order to form a planar inverted F-antenna (PIFA) to be used together with said coplanar waveguide antenna. Thereby a multi-frequency hidden antenna is formed which can improve bandwidth, radiation efficiency and gain during making coplanar of and miniaturizing the hidden antenna.

Abstract: A dual- or multi-frequency planar inverted F-antenna, wherein, a metal surface of the antenna matching the size and shape of the interior installation space of an equipment is installed on the top of a grounding surface, an open slot provided on the metal surface forms a common close end and an open end to thereby partitions the metal surface into a long section and a short section; a desired impedance matching between a short point and a feed point of the metal surface is obtained by adjusting positions of the short point and the feed point in pursuance of frequencies desired; the length of the long section from the short point to the open end of the open slot and the length from the short point to the end point of the short section are decided by dual- or multi-resonance frequencies in cooperating with the open slot which is deformed and curved.

Abstract: A capacitor-loaded type single-pole planar antenna, the antenna has a base installed on a non-electric conductive housing of a communication equipment with a metal shield inside, the base has a surface of a desired area, a tortuous low band antenna with a total length of ¼&lgr; of 900 MHz is provided on the surface, the low band antenna contains an open circuit end and a feed end, the feed end is driven by an interior RF circuit of the communication equipment, a capacitor and an open stub with a total length of ¼&lgr; of 1800 MHz and functioning as a high band antenna are installed on the tailing end of the low band antenna. Thus a dual-frequency planar antenna which can be directly installed on the surface of the housing of the communication equipment such as a mobile phone in a completely flat mode is accomplished.

Abstract: A planar helix antenna with two frequencies, comprising a circuit board with suitable area and thickness and an upper and a bottom surface on which several microstrip antenna sections are disposed in a an inclined and mutually spaced way, wherein, through holes are provided on the circuit board for conjunction ends of the antenna sections on the upper and bottom surfaces for electric connection to form a planar helix microstrip antenna; the top most end of the antenna sections has top loading, while the bottom end thereof is an out feeding point. The antenna sections get a high frequency harmonic oscillation point by coupling; while connection of these microstrip antenna sections on the front and the back sides can form by its electrical gross length a low frequency harmonic oscillation point. Such variation of space and top loading of the microstrip antenna sections can endue the dual frequency planar and miniaturized helix microstrip antenna with superior performance.

Abstract: A planar helix antenna with two frequencies, comprising a circuit board with suitable area and thickness and an upper and a bottom surface on which several microstrip antenna sections are disposed in a an inclined and mutually spaced way, wherein, through holes are provided on the circuit board for conjunction ends of the antenna sections on the upper and bottom surfaces for electric connection to form a planar helix microstrip antenna; the top most end of the antenna sections has top loading, while the bottom end thereof is an out feeding point. The antenna sections get a high frequency harmonic oscillation point by coupling; while connection of these microstrip antenna sections on the front and the back sides can form by its electrical gross length a low frequency harmonic oscillation point. Such variation of space and top loading of the microstrip antenna sections can endue the dual frequency planar and miniaturized helix microstrip antenna with superior performance.

Abstract: An omni-directional broadband helical antenna array having a square electric circuit board with the back side thereof grounded, wherein, the four orthogonal corners on the surface of the electric circuit board are provided each with a helical antenna. The distance between every two of the helical antennae is in the range of 0.25 &lgr;-0.3 &lgr;. The helical antennae feed signals outwardly via microstrip lines, the length of each of the microstrip lines is ¼&lgr;; and they feed signals outwardly via another microstrip line after gathering the above mentioned microstrip lines. Thus an omni-directional broadband helical antenna device capable of mounting in a communication instrument such as a notebook style computer is formed.

Abstract: A miniature microstrip antenna having a circuit board with a suitable length and a suitable width, and especially a microstrip antenna of which the size is reduced but the antenna still keeps the broadband function in all the directions, wherein, the circuit board does not have any metallic portion in the back side thereof. A ¼&lgr; microstrip line is rolled on the surface of the circuit board in the shape of a rectangular spiral, the end of the rectangular spiral microstrip line is connected via a vertical section to another {fraction (1/20)}&lgr; microstrip line which acts as an open-stub. A junction of the rectangular spiral microstrip line with the open-stub acts as a signal feeder point; a ground plane is provided near the signal feeder point but does not connect with the signal feeder point, the ground plane is punched to form a hole to get a desired harmonic oscillation frequency shifting. The miniature microstrip antenna has the size thereof reduced can thus be obtained.