Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Reexamination Certificate
1999-06-30
2001-11-06
Hunter, Daniel (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
C343S7000MS, C343S831000, C343S846000
Reexamination Certificate
active
06314275
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hand-held transmitting and/or receiving apparatus comprising an elongated housing, an electric circuit inside the housing, an earphone at one side and one end of the housing, an electrical ground plane at the other side of the housing opposite to the earphone, an antenna resonator element arranged approximately parallel to the ground plane and having a first free and a second end which is electrically connected by a ground connector to the ground plane and means for connecting the ground plane and the resonator element to the electrical circuit.
2. Description of the Prior Art
An apparatus of this kind is disclosed in Japanese patent application 63-86 559. The antenna is an inverted F-antenna. The antenna resonator element of this antenna is connected to the ground plane by a ground connector at the end of the housing where the earphone is positioned. Therefore the free end of the antenna points away from this end of the housing and extends to the middle of the housing where the hand of the user holds the apparatus. From this follows that the hand of the user not only influences the field of the antenna and the radiation pattern accordingly but also the resonance frequency, the impedance and the gain of the antenna. As a result of the mismatching standing waves on the feedline to the antenna appear resulting in a loss of high frequency power.
A further disadvantage of this known antenna results from the fact that the centre of the head of the user is near to the maximum of the strength of the electrical field of the antenna. This results in additional losses of the radiation energy when the antenna is used as a transmitting antenna but results also in influences of the electrical field to the head of the user so loading the head with health risks.
The object of the invention is to overcome the disadvantages of the state of the art namely to avoid influences from the hand or head of a user of the hand-held transmitting and/or receiving apparatus on the antenna and vice versa.
SUMMARY OF THE INVENTION
The basic idea of the invention is to turn the known antenna by 180° so that the free end of the antenna is pointing to the end of the housing where the earphone is positioned. Therefore the maximum of the electrical field of the antenna is as far away from the user as possible, especially from his hand and his head so that the mutual influence is minimum. This means a lower influence on the electrical parameters of the antenna, especially impedance, gain and effectively. On the other side the risks on the health of the user are minimized.
According to one embodiment of the invention the ground plane extends over approximately the whole width of the elongated housing. This assists in achieving a radiation pattern having the maximum or maxima away from the head of the user.
According to a further embodiment of the invention the resonator element has approximately the same width and radiation pattern.
To this also adds a further improvement of the basic idea of the invention according to which the ground connector extends over the whole width of the resonator element.
According to a further improvement an elongated feeder element is provided positioned at one side of the resonator element for coupling the feeder element to the resonant element, one end of the feeder element representing a feeding end coupled to the means for connecting the resonator element to the electric circuit. This improvement avoids a galvanic contact between the electric circuit and the resonator element. Preferably the feeder element extends over approximately the whole length of the resonator element. By this an electromagnetic coupling is achieved. Additionally the feeding end of the feeder element can be positioned at the free end of the resonant element.
According to one improvement of the invention a projection is provided at the edge of the free end of the resonator element the projection having a smaller width than the resonator element. By adjusting the length of the projection the resonant frequency of the resonator element can be tuned. Preferably, the width of the projection is ten times or more less than the width of the resonator element. By this dimensioning of the projection a fine tuning of the resonator element is possible.
According to one improvement of the invention the resonator element and the ground plane are in the form of an electrically conducting layer or coating on a dielectric substrat. By this airgaps between the resonator element and the ground plane are avoided which may be influenced by mechanical forces, temperature or the like which could change the electrical parameters of the antenna. Preferably the dielectric substrat is the housing or a part of the housing. More preferably the dielectric substrat is a separate unit connected to or positioned inside the housing made from nonconducting material. The ground connector may comprise one single ground connector element extending over the whole width of the resonator element or may comprise at least two ground connector elements distributed over the width of the resonator element.
REFERENCES:
patent: 4167010 (1979-09-01), Kerr
patent: 4191959 (1980-03-01), Kerr
patent: 4641366 (1987-02-01), Yokoyama et al.
patent: 4701763 (1987-10-01), Yamamoto et al.
patent: 4876709 (1989-10-01), Rogers et al.
patent: 4980604 (1990-12-01), Hines
patent: 4980694 (1990-12-01), Hines
patent: 5365246 (1994-11-01), Rasinger et al.
patent: 5493704 (1996-02-01), Grangeat et al.
patent: 6121930 (2000-09-01), Grangeat et al.
patent: 6134421 (2000-10-01), Lee et al.
patent: 6218991 (2001-04-01), Sanad
patent: 6225951 (2001-05-01), Holshouser et al.
patent: 0176311 (1986-04-01), None
patent: 0522538 (1993-01-01), None
patent: 2238665 (1991-06-01), None
patent: 405259725 (1993-10-01), None
patent: WO90/13152 (1990-11-01), None
patent: WO94/24743 (1994-10-01), None
patent: 94/24723 (1994-10-01), None
Pedersen Gert Frølund
Thomsen Jan Gert
Hunter Daniel
Telit Mobile Terminals S.p.A.
Tran Pablo
Wood, Herron & Evans LLP.
LandOfFree
Hand-held transmitting and/or receiving apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hand-held transmitting and/or receiving apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hand-held transmitting and/or receiving apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2574116