Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-12-29
2001-08-14
Phan, Tho G. (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S829000, C343S831000
Reexamination Certificate
active
06275192
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a planar antenna and, more particularly, to a small planar antenna combined with a printed circuit board.
2. Description of the Related Art
Antennas are classified into linearly (vertical or horizontal) polarized wave antennas, and circularly polarized wave antennas according to the polarization properties of incident electromagnetic waves. The linearly polarized wave is transmitted along a plane and thus it can be lost. In contrast, the circularly polarized wave is transmitted through two planes of the same size that cross each other, and interference from other devices can be eliminated because the circular polarization antenna is able to transmit two polarized components, the horizontally and vertically polarized waves. Thus, even if the position and direction of a transmission antenna or reception antenna changes, both transmission and reception of waves are possible, and there is an advantage of omnidirectional sensitivity.
Recently, the advance in wireless data communications has increased the need for the bluetooth PICO Net (BPN) antenna which couples personal computers (PCs), notebook PCs, printers, or mobile phones through a wireless network. The BPN antenna is a circular polarization antenna which has a consistent transmission/reception sensitivity in every direction, with non-directional properties, or an antenna capable of radiating a plurality of polarized waves.
On the other hand, a conventional circular polarization antenna includes an x-directional antenna arranged in the x-direction and an x-directional antenna which is arranged perpendicular to the x-directional antenna. Both the x-directional antenna and the y-directional antenna are half wavelength dipole antennas. Referring to
FIG. 1
, the wavelength of an x-directional horizontally polarized wave
1
radiated from the x-directional antenna has a phase difference of 90° with respect to the wavelength of a y-directional vertically polarized wave
2
radiated from the y-directional antenna. Thus, circularly polarized waves can be obtained by powering the x-directional antenna and the y-directional antenna in sequence. However, a drawback of the conventional circular polarization antenna lies in that to provide the x- and y-directional antennas with the phase difference of 90°, a phase shifter for delaying a radio frequency (RF) signal fed from an RF signal module of the antenna is needed. In addition, the complicated structure of the antenna hinders production of a small antenna.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a planar antenna with consistent transmission and reception sensitivity in every direction, which can be adapted in a small device.
The objective of the present invention is achieved by a planar substrate comprising: a dielectric layer with a predetermined thickness; a first ground layer formed on a top surface of the dielectric layer; and a second ground layer formed on a bottom surface of the dielectric layer, with the first ground layer and the second ground layer corresponding to each other. A first antenna unit is provided which extends from a side of the first ground layer and a side of the second ground layer. The first antenna unit has a predetermined pattern that radiates a first polarized wave with an application of current. A second antenna unit is provided which extends from a side of the first ground layer and a side of the second ground layer. The second antenna unit has a predetermined pattern that radiates a second polarized wave orthogonal to the first polarized wave with the application of current. A feeding stripline is installed between the first and second antenna units, in the dielectric layer, for applying current to the first and second antenna units, wherein the first and second polarized waves can be separately radiated from the first and second antenna units, respectively.
REFERENCES:
patent: 5526003 (1996-06-01), Ogawa et al.
patent: 5828340 (1998-10-01), Johnson
patent: 6043786 (2000-03-01), Vannatta et al.
patent: 6133880 (2000-10-01), Grangeat et al.
patent: 6133881 (2000-10-01), Kushihi et al.
patent: 6195049 (2001-02-01), Kim et al.
patent: 6211825 (2001-04-01), Deng
Phan Tho G.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
LandOfFree
Planar antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Planar antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planar antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2506359