HAND-HELD COMMUNICATION EQUIPMENT WITH A RADIATION SHIELDING ANTENNA APPARATUS

Abstract: A hand-held communication equipment with a radiation shielding antenna apparatus comprises a main body and an antenna apparatus. Said antenna apparatus includes an antenna rod and a radiation shielding case being disposed on base portion of the antenna. When user makes a use of said hand-held communication equipment, said antenna rod is tilted, till it is normal to the main body. A polarizing form of the antenna is altered by an opposite arranged changement between the antenna and the main body, an electro-magnetic radiation effect is produced by the radiation shielding case, thus, can form a safe range in a place of head part of the user to make the radiation minimize to the head part of the user.

Description: TECHNICAL FIELD This invention relates to a hand-held communication equipment with a radiation shielding antenna apparatus, comprising a hand-held main body and an antenna apparatus, said antenna apparatus comprises an antenna rod and an antenna pedestal, wherein a plug is on the bottom of the fixing frame designed to fit in with the antenna socket in the hand-held main body for plucking the antenna apparatus into the main body, 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 telephones main body), so that the user's head is in a safe area formed in the new polarising 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. Figure 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 caused conveniently; pure inductance type antenna, used in mini and micro communication equipment, in which the antenna is minified 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 Figure 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 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 Meteorological Institute, when the transmitted power is 0.6w, the electromagnetic power density around the antenna is 1100 to 2800mW/cm 2 . An improvement to common hand-held communication apparatus is disclosed in W094/21053. In such an apparatus, a retrofit fixture is provided for the existing hand-held cellular telephone, and a small additional shielding body lies alongside the telephone handset. Within the additional body, there is a retractable antenna, which is electrically connected to the antenna output of telephone, and is arranged downwardly past the end of the telephone handset where the mouthpiece is located. This relocation make the energy radiating antenna away from the brain tissue, and according to the radiation square law, the amount of radiated energy received by the brain is effectively reduced. 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 polarising mode so that the electromagnetic radiation sustained by the user's head will be minimised to attain the safety standards established by the Health Ministry of the People's Republic of China. The purpose of the present invention is achieved as follows: the hand-held communication equipment with a radiation shielding antenna apparatus of the present invention comprises a hand-held main body of the communication equipment and an antenna apparatus arranged at the top of the main body, in which said antenna apparatus comprises an antenna rod and a radiation shielding case disposed at the base portion of the antenna. When the user makes use of said hand-held communication equipment, said antenna rod shall be tilted toward the backside of the main body of the hand-held communication equipment, with the angle between the antenna rod and the main body being 0°< Θ < 90°, preferably 45° < Θ < 90°, and most preferably Θ = 90°, thus, by means of changing the position of the antenna relative to the main body, and by the capacitance produced between the radiation shielding case and the inductive coil within the antenna apparatus, the polarising mode of the antenna is changed into a dual-foliar polarising mode, thus, a safe area is formed in the position around the user's head part, thereby minimising the radiation to the user's head part. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram of the antenna polarising mode when a conventional hand-held telephone is in use; Figure 2 shows the structure of the antenna apparatus of the present invention; Figure 3 shows the hand-held telephone of the present invention in a working state; Figure 4 is a diagram illustrating the principle of polarising mode of the antenna apparatus of the present invention. EMBODIMENT OF THE PRESENT INVENTION In order to describe clearly the structure and principle of the antenna apparatus of the invention, Motorola 9900 hand-held telephone is taken for example, however, it is apparent to those skilled in the art that the structure and principle of the present invention can also be applied to other types of hand-held communication equipment. Figure 2A and 2B are detailed illustrations of the structure of the antenna apparatus of the present invention, and Figure 3 is a hand-held telephone equipped with the antenna apparatus of the present invention, Figure 2A shows the antenna in a vertical position, and Figure 2B illustrates that the antenna is perpendicular to the main body when the hand-held equipment is in a working state. The antenna apparatus of the present invention comprises an antenna rod 2 and an antenna pedestal 3. An inductive coil 5, an inductive-coii fixing frame 6, a radiation shielding case 7 and a pedestal shell 8 are fixed on the pedestal. The lower end of the antenna rod may have a globe joint 9 or the like so that the antenna 2 can tilt toward the backside of the main body after being pulled out completely from the sleeve 4 in the telephone main body 1, until it is perpendicular to the main body. There is a plate spring 10 at the upper end of the inductive coil 5 pressing tightly against the antenna 2 to serve as a signal source of the antenna. The coil 5 is molded inside of the inductive coil fixing frame 6. There is a plug 11 on the bottom of the fixing frame 6, designed to fit in with the antenna socket of the hand-held telephone 1 for plugging the antenna apparatus into the main body. The radiation shielding case 7 made of a metallic material is grounded and covers the inductive coil fixing frame 6 for producing shielding effect to prevent the electromagnetism in the inductance from leaking, and achieving a change in the electromagnetic polarising mode through the capacitance produced between the radiation shielding case 7 and the inductive coil 5, so as to damp the electromagnetic field around the hand-held telephone earphone, thereby enabling the effective power to act on the antenna 2. The coil 5, fixing frame 6 and radiation shielding case 7, etc. are encased completely in the pedestal shell 8. Said pedestal shell 8 has a notch open toward the backside of the main body, with the width of said notch being equal to the diameter of the antenna for fixing the orientation of the antenna so that the antenna can not swing in the horizontal direction when it is perpendicular to the main body. When the user wants to use the hand-held communication equipment of the present invention, he only needs to insert the plug 11 on the bottom of the inductive-coil fixing frame 6 into the antenna socket of the handset with the notch of the antenna pedestal shell open toward the backside of the main body, and press the snap-on portion 12 of the antenna pedestal shell onto the corresponding portion of the handset shell. When the antenna is inserted completely into the antenna sleeve 4 in the handset, the handset is in a receiving state. If the user needs to make a call, the antenna 2 shall be pulled out completely from the sleeve 4, as shown Figure 3, and tilted toward the backside of the main body, preferably until it is perpendicular to the main body. The polarising mode of the antenna apparatus of the present invention and the principle of damping the radiation to the head part of the user will be illustrated as follows with reference to Figures 2, 3 and 4. The basic principle of the present invention is to change the polarising mode of the antenna for a new polarising mode, i.e., to shift the direction of a vertical antenna by letting it tilt toward the backside of the main body or be perpendicular to the main body and in combination with the arrangement of a radiation shielding case mounted at the base portion of the antenna to get the radiation intensity of the communication equipment antenna to be different in different directions, and to form a weak field strength area in a certain region, which is called a safe area. In this safe area the purpose of radiation shielding can be attained by diverting the strong field away from the position of the user's head part; that is, by means of changing the relevant position of the antenna and incorporating the principle of electromagnetic shielding, the user's head part can be protected from strong electromagnetic wave radiation in a relevant position. As shown in Figure 4, the matched inductance of the antenna pedestal is shielded with a grounded metal shell to prevent the electromagnetic wave from leaking and endangering the safety of the user's head part, thus, in addition to changing the electromagnetic direction of the antenna (as shown in the figures), a reasonable impedance matching can be achieved by the capacitance generated between the radiation shielding case and the Inductance to produce a safe area in the earphone position near the head part and attain the purpose of radiation shielding.

Claims: A hand-held communication equipment with a radiation shielding antenna apparatus, comprising a hand-held main body (1) and an antenna apparatus, said antenna apparatus comprises an antenna rod (2) and an antenna pedestal (3), wherein a plug (11) is on the bottom of the fixing frame (6) designed to fit in with the antenna socket in the hand-held main body (1) for plugging the antenna apparatus into the main body (1), characterised in that an inductive coil (5), an inductive coil fixing frame (6) and a radiation shielding case (7) are fixed in said pedestal (3) arranged at the top of the main body (1); the lower end of the antenna rod (2) has a globe joint (9); there is a plate spring (10) at the upper end of the inductive coil (5) pressing tightly against said antenna (2) serving as the signal source of the antenna; said radiation shielding case (7) encases the inductive coil (5) for producing a capacitance between said shielding case (7) and said inductive coil (5), thereby changing the polarising mode of the antenna; in the working state, the antenna rod (2) tilts toward the backside of the hand-held communication equipment main body (1), so as to change the polarising mode of the antenna into a dual foliar polarising mode, thus enabling the head part of the user to be in the radiation safe area generated by the new polarising mode. The hand-held communication equipment with a radiation shielding antenna apparatus according to claim 1, characterised in that the angle between the antenna rod and the backside of the main body is 0° < Θ < 90°. The hand-held communication equipment with a radiation shielding antenna apparatus according to claim 1, characterised in that the angle between the antenna rod and the backside of the main body is Θ = 90°.

Inventors: WANG LEI, WANG WEI, WANG, LEI, WANG, WEI
Applicants: WANG LEI, WANG WEI, WANG, LEI, WANG, WEI
Application year: 1996
Main classification: H01Q1
IPC codes: H01Q1, H05K9, H04B1