Antenna structure used in portable radio device
First Claim
1. An antenna structure used in a portable radio device, comprising:
- battery means for supplying power to said radio device, said battery means having a negative terminal and a cylindrical conductor electrically connected to said negative terminal;
loop antenna means, one end of which is connected to a common potential and the other end of which is connected to said portable radio device, the longitudinal axis of said battery means being substantially perpendicular to a plane including said loop antenna; and
coil spring means one end of which is connected to said common potential and the other end of which is electrically connected to said negative terminal, said coil spring means being inductively coupled to said loop antenna means.
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Abstract
An antenna structure comprises a loop antenna electrically connected to a high-frequency circuit of a portable radio device. The antenna structure also comprises a supplemental antenna including a coil spring which is used for fixing a dry battery powering the portable radio device, and a negative cylindrical conductor of the dry battery which conductor is electrically connected with the coil spring. The coil spring is placed to be inductively coupled to the loop antenna. The longitudinal axis of the dry battery is substantially perpendicular to a plane including the loop antenna. Thus, deterioration in signal reception sensitivity due to the directivity of the loop antenna can be compensated by the supplemental antenna.
155 Citations
26 Claims
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1. An antenna structure used in a portable radio device, comprising:
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battery means for supplying power to said radio device, said battery means having a negative terminal and a cylindrical conductor electrically connected to said negative terminal; loop antenna means, one end of which is connected to a common potential and the other end of which is connected to said portable radio device, the longitudinal axis of said battery means being substantially perpendicular to a plane including said loop antenna; and coil spring means one end of which is connected to said common potential and the other end of which is electrically connected to said negative terminal, said coil spring means being inductively coupled to said loop antenna means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An antenna used in a portable radio device, comprising:
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loop antenna means for picking up a radio signal; matching circuit means for impedance matching said loop antenna means and a radio section of said radio device; and supplemental antenna means inductively coupled in parallel to said loop antenna means with respect to a common potential for picking up a radio signal, said supplemental antenna means having first conductor means inductively coupled to said loop antenna means and second conductor means electrically connected with said first conductor means and substantially perpendicular to a plane including said loop antenna means. - View Dependent Claims (10)
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- 11. An antenna as claimed in claimed 10, wherein said cylindrical conductor comprises a negative cylindrical conductor of a battery, said battery supplying power to said radio device and wherein said helically shaped conductor comprises a negative coil spring terminal electrically connecting a negative terminal of said battery with said radio device and fixing said battery.
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15. An antenna comprising:
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a first conductor formed as a loop and connected through a resonant matching circuit to a communication circuit; and a second conductor arranged along a linear line substantially perpendicular to a plane including said loop, intersecting said plane at a substantial center of said loop and having an electric length in its longitudinal direction approximated to an odd multiple of one-fourth of an operating wavelength, said second conductor including a negative electrode cylinder of a battery and a helical conductor, said helical conductor being in contact with an outer surface of a portion of said cylinder to connect a negative potential of said battery to common potential of said communication circuit. - View Dependent Claims (16, 17)
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18. A paging receiver comprising:
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antenna means for picking up a radio signal; receiver section means connected to said antenna means for demodulating said radio signal to produce a baseband signal; decoder means for detecting from said baseband signal a paging number assigned to said paging receiver; annunciator means responsive to the detection of said paging number for generating an alert signal; and battery means for supplying power to said receiver section means, decoder means and annunciator means, wherein said battery means comprises a dry battery having a cylindrical conductor and a negative terminal electrically connected with said cylindrical conductor, and wherein said antenna means comprises; a loop antenna connected between said receiver section and common potential of said receiver, the longitudinal axis of said cylindrical conductor being substantially perpendicular to a plane including said loop antenna; and a coil spring connected between said negative terminal and said common potential for fixing said dry battery, said coiled spring being inductively coupled to said loop antenna. - View Dependent Claims (19, 20, 21)
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22. An antenna structure comprising:
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loop antenna means electrically connected to a high-frequency circuit of a portable radio device; and supplemental antenna means having a coil spring which fixes a dry battery powering said portable radio device, and a cylindrical conductor of said dry battery which conductor is electrically connected with said coil spring, said coil spring being placed to be inductively coupled to said loop antenna means, the longitudinal axis of said cylindrical conductor being substantially perpendicular to a plane including said loop antenna means.
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23. A method of picking up a radio signal for a portable radio device powered by a battery and including a loop antenna, said method comprising the following steps of:
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connecting one end of said loop antenna with a common potential of said radio device; connecting one end of a coil spring with said common potential; connecting the other end of said coil spring with a negative terminal of said battery; placing said battery so that the longitudinal axis of a negative cylindrical conductor of said battery is substantially perpendicular to a plane including said loop antenna and; placing said coil spring so that said coil spring inductively couples to said loop antenna. - View Dependent Claims (24)
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25. An antenna used in a portable radio device, comprising:
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first antenna means for picking up a radio signal, said first antenna means inducing maximum power when said radio device is in a first position, said first antenna means including a loop antenna; matching circuit means for impedance matching said first antenna means and a radio section of said radio device; and second antenna means for picking up a radio signal, said second antenna means inducing maximum power when said radio device is in a second position different from said first position and including supplemental antenna means inductively coupled in parallel to said loop antenna with respect to a common potential and substantially perpendicular to a plane including said loop antenna. - View Dependent Claims (26)
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Specification