Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
1999-04-01
2001-06-12
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C455S090300
Reexamination Certificate
active
06246371
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to an antenna means for transmitting and receiving RF signals having a radiating structure with a band shape. Specifically, it relates to an antenna device for a mobile radio communication device, e.g., a hand-portable telephone or a car radio antenna, which is capable of both transmitting and receiving on multiple separate frequency bands. This would increase the probability of the telephone being operable for communication in a site where service is available within more than one band. Such a telephone may be a terminal in, e.g., a GSM, PCN, DECT, AMPS, PCS, and/or JDC cellular telephone system, possibly having an additional pager function or other radio facilities. The frequencies included in the multiple bands of the invention do not need to have any fixed relationship to one another and may thus have arbitrary separations.
The invention also relates to an antenna means which is compact, and requires a small space. For mobile radio communication devices, and especially hand-portable telephones there is a demand for small and efficient antenna means, to decrease the weight and to occupy less space.
RELATED ART
Antenna means having a band shaped radiating structure are known. For example, WO 91/15621 discloses an antenna structure in which the antenna is a foil having helical shape which is supported by winding it on a hollow cylindrical braid. The foil and the braid cylinder are potted in a resin. This antenna structure demands a quite large amount of space, which makes it unpractical for use in small hand-portable telephones or where there is a need for small and efficient antenna means. Further its manufacture is rather complicated.
EP-A1-0 509 339 discloses an antenna with top capacitance for use with mobile radio telephones. The antenna system has a counterweight base with the antenna formed by a top capacitor that has an S-shaped coil connection and a contact point. The top capacitor, having U-shape, is formed as a flexible foil with a substrate having a printed circuit pattern.
An antenna of this kind has the disadvantage that, with the top capacitance, it is difficult to achieve a desired electrical/physical length of the antenna. Therefore, a complicated feeding arrangement is needed, or the device cannot operate in lower frequency bands, especially in the frequency range of 875-960 MHz, where the physical length corresponding to 0.25 &lgr; is about 80 mm. Furthermore, the described feeding arrangements cause undesired losses. The geometrical shape is further limited to a U-shape.
SUMMARY OF THE INVENTION
A main object of the invention is to provide a wide band antenna means for transmitting and receiving RF signals, comprising: an antenna means for transmitting and receiving RF signals, comprising: a ground plane means arranged to be connected to ground of the circuitry of a radio communication device; a conductive radiating structure having band shape; the band having a first and a second essentially parallel, closely spaced and opposed surfaces; the radiating structure having in a first end a feed portion arranged to be coupled to circuitry of the radio communication device, and; the radiating structure having a second end being a free end, which antenna means is capable of transmitting and receiving RF signals in each one of a plurality of frequency bands, and requiring a small space.
Specifically the antenna means is intended as a single, sufficient antenna means to fulfil the requirements under normal operating conditions of a portable or mobile radio device capable of both transmitting and receiving in multiple frequency bands.
Another object of the invention is to provide a wide band antenna means which exhibits high efficiency in the different frequency bands, and radiation lobe pattern without significant “dead angles”.
It is a further object of the invention to enable directional radiation characteristics and improved gain pattern by selecting a combination of geometries of the radiating structure and the ground plane means.
Yet another object of the invention is to provide a wide band antenna means compact and durable enough for portable or mobile radio equipment, including automobile antennas of built-in type.
Still another object of the invention is to provide a wide band antenna means which is suited for manufacturing costeffectively in large quantities.
These and other objects are attained by an antenna means for transmitting and receiving RF signals. The antenna includes a ground plane arranged to be connected to the ground of the circuitry of a radio communication device. There is a conductive radiating structure having a shape of a band wherein the band has a first A surface and a second B surface which are essentially parallel, closely spaced and opposed surfaces. The radiating structure has, in a first end, a feed portion arranged to be coupled to circuitry of the radio communication device. Also, the radiating structure has a second end which is a free end. The band is divided by bend portions to form a number of sections (S
n
) along its length. The first surface A of a first section (S
1
) faces the first surface A of a second section (S
2
) which is consecutive to the first section (S
1
), and the second surface B of a section (S
m
) faces the second surface B of a consecutive section (S
m+1
).
The antenna means includes the first surface A of at least a further section (S
i
) which is facing the first surface A of a consecutive section (S
i+1
). Also, the second surface B of at least a further section (S
k
) faces the second surface B of a consecutive section (S
k+1
). The second surface B of the second section (S
2
) is facing the second surface B of a third section (S
3
), and it is adjacent to the second section (S
2
). Accordingly, for every section, the first surface A faces the first surface A of an adjacent section.
An angle is formed between at least one tangent line of each pair of surfaces facing each other. The angle between and inclusive of 0°-90°.
According to the invention, the feed portion, being a part of the band, extends in a direction essentially perpendicular to the ground plane means.
The antenna means includes a consecutive section (S
j
) which is located further away from the feed portion than the previous section (S
j−1
).
In the present invention, the conductive band has a central longitudinal axis, and the central longitudinal axis of the band extends essentially parallel with the ground plane.
Alternatively, the conductive band has a central longitudinal axis wherein the band is bent, between consecutive sections, and around bending axes which are essentially perpendicular to the longitudinal axis in the respective section.
Additionally, the conductive band can have a central longitudinal axis wherein the band is bent, between consecutive sections, around bending axes so as to provide an angle &bgr;>0° between the longitudinal axis in the respective consecutive sections.
In the invention, the ground plane is a part of the radio communication device. In other words, the housing and the ground plane has a conductive plate.
According to the invention, the band is of such a thickness that the radiating structure is self supporting. Also, the band is supported by a dielectric carrier, e.g., a dielectric band or body.
The antenna means includes that each section can be divided into a concave and a convex portion.
In the invention, the band can be provided with a slit between each section. Each of the slits extends from one edge of the band towards the opposite edge. The band is conductively interrupted between the sections by the slit except for a portion adjacent to the opposite edge. Accordingly, the slits extend alternately from opposite edges of the band along the length of the band.
Also, the band can have an increasing or decreasing width along its length. In one embodiment, the width w of the band in each section is greater than the length
1
of the respective section. In another embodiment, the width w of the band in each secti
Hellgren Mattias
Hu Annika Yidong
Kurz Hans-Peter
Allgon AB
Clinger James
Jacobson Price Holman & Stern PLLC
Wong Don
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