Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-11-17
1999-08-17
Le, Hoanganh
Communications: radio wave antennas
Antennas
With radio cabinet
343841, 455 89, 455 90, H01Q 124
Patent
active
059400390
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a hand-held communication equipment with a radiation shielding antenna apparatus, and in particular, relates to altering the direction of a vertical antenna of the hand-held communication equipment, such as hand-held telephone, interphone and cordless telephone, etc., by tilting it toward a direction away from human body and to the horizontal direction (i.e., letting the antenna tilt backward to the backside of the hand-held telephone's main body), so that the user's head is in a safe area formed in the new polarizing mode, thereby damping the electromagnetic radiation to the user's head part below the safety standard.
BACKGROUND ART
At present, hand-held communication equipment has become more and more popular for its advantages such as free from the restriction of telephone line, handy portability and rapid connection. However, the radiation pollution brought by the hand-held communication equipment to the user shall not be ignored. Take a hand-held telephone set for example, when the user is having a call, the sound wave is converted into high-frequency electromagnetic wave by the hand-held telephone so as to send out electric signal. At the same time, relatively intensive high-frequency microwave radiation will occur in the surrounding space of the handset antenna. If the user's head part is exposed to such intense high frequency microwave radiation for long durations frequently, an injury to the user's head may be caused and result in pathological changes.
FIG. 1 is a diagram of electromagnetic radiation pattern of a conventional hand-held telephone antenna, which is used as an example to illustrate the radiation pollution of a hand-held telephone overshadowing the user's head.
The existing hand-held telephone antenna are usually divided into the following types: the ordinary rod type antenna, which is generally used in the communication equipment with microwave band with relatively shorter wavelength; inductively-loaded rod type antenna, which can be used in the communication equipment with relatively wider frequency band in which the length of the antenna is limited by the inductance for the purpose of shortening the antenna length so that it can be carried conveniently; pure inductance type antenna, used in mini and micro communication equipment, in which the antenna is minimized mainly for easy carrying; magnetic induction type antenna, used in single-section telescopic type hand-set, featuring a structure which is easy to carry and handy to use.
The electromagnetic waves transmitted by the above four types of antennae emit all around, as shown in FIG. 1, therefore the microwave radiation to the user will occur. Under the condition of the same power, the shorter the antenna is, the greater the transmitted power density will be, and consequently the severer the radiation to the user's head part will be. As it is specified explicitly in the safety and hygienic standards of environmental electromagnetic wave radiation published by the Health Ministry of the People's Republic of China that 40 mW/cm.sup.2 is the second-grade safety standard, the value exceeding this standard will have harmful influence on human body. Take the hand-held telephone for example, according to the test conducted by the China National Metrological Institute, when the transmitted power is 0.6 w, the electromagnetic power density around the antenna is 1100 to 2800 mW/cm.sup.2.
DISCLOSURE OF THE PRESENT INVENTION
The purpose of the present invention is to provide a hand-held communication equipment with a radiation shielding antenna apparatus to overcome the above defects in the prior art. When using the communication equipment with a radiation shielding antenna apparatus of the present invention, the head part of the user is in a safe area formed by the new polarizing mode so that the electromagnetic radiation sustained by the user's head will be minimized to attain the safety standards established by the Health Ministry of the People's Republic of China.
The purpose of the prese
REFERENCES:
patent: 5214434 (1993-05-01), Hsu
patent: 5335366 (1994-08-01), Daniels
patent: 5336896 (1994-08-01), Katz
patent: 5590416 (1996-12-01), Rydbeck
patent: 5613224 (1997-03-01), Auvray
patent: 5646635 (1997-07-01), Cockson et al.
patent: 5826201 (1998-10-01), Gratias
Wang Lei A.
Wang Wei
Chen Shih-Chao
Le Hoang-anh
LandOfFree
Hand-held communication equipment with a radiation shielding ant 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 communication equipment with a radiation shielding ant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hand-held communication equipment with a radiation shielding ant will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-319078