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Mobile Phone Patent Abstract
An antenna for mobile phone mainly includes a low-profile multi-layered
circuit board mounted on a base and protectively covered with a
light-transmissible hood fitted around the base. The low-profile
multi-layered circuit board is provided at a reverse side with a
printed antenna and at a front side with a half-wave voltage-doubling
circuit and a light-emitting element. A power input of the half-wave
voltage-doubling circuit is replaced with a printed inductance for
inducing an alternating voltage and generating a resonance to eliminate
a capacitive reactance in a diode included in the circuit. The diode
rectifies the induced alternating voltage to a direct voltage for
driving the light-emitting element to emit lights. When additional
n diodes and n capacitances are parallelly connected to the half-wave
voltage-doubling circuit, a half-wave voltage-multiplying circuit
is constituted, so that an amplified output voltage (n+1)Vm times
as large as a received voltage signal can be obtained to drive multiple
light-emitting elements connected to the output of the circuit to
emit lights.
Mobile Phone Patent Claims
What is claimed is:
1. An antenna for mobile phone, comprising a light-transmissible
hood, a low-profile multi-layered circuit board protectively covered
by said hood, and a base onto which said low-profile multi-layered
circuit board is mounted and around which said hood is fitted; said
antenna being characterized in that:
said low-profile-multi-layered circuit board is provided at a reverse
side with a printed antenna and at a front side with a half-wave
voltage-doubling circuit and at least one light-emitting element;
a power input of said half-wave voltage-doubling circuit being replaced
with a printed inductance for inducing an alternating voltage and
generating resonance to eliminate a capacitive reactance in a diode
that is included in said half-wave voltage-doubling circuit for
rectifying said induced alternating voltage to a direct voltage
for driving said at least one light-emitting element to emit lights.
2. An antenna for mobile phone as claimed in claim 1, wherein said
light-emitting element is a light emitting diode.
3. An antenna for mobile phone as claimed in claim 1, wherein said
low-profile multi-layered circuit board includes two or more of
said light-emitting elements.
4. An antenna for mobile phone as claimed in claim 1, wherein said
half-wave voltage-doubling circuit is adapted to parallelly connect
to additional n diodes and n capacitances to constitute a half-wave
voltage-multiplying circuit that amplifies a received voltage signal
to an output voltage (n+1)Vm times as large as said received voltage
signal.
Mobile Phone Patent Description
BACKGROUND OF THE INVENTION
The present invention relates to an antenna for mobile phone, and
more particularly to an antenna for mobile phone that uses a printed
circuit to replace the conventional coil antenna, so that the antenna
is manufactured at reduced cost and provides increased frequency
stability.
With the increasingly grown technology nowaday, mobile phones have
not only largely reduced dimensions but also changeful appearances.
However, most mobile phones have an antenna that is almost unchanged--a
black, thick and short bar projected from a top of the mobile phone
and having simple functions of receiving and transmitting signals.
There are manufacturers developing some antennas for mobile phone
that are able to emit lights, in addition to receive and transmit
signals, enabling users to know current conditions of their mobile
phones through not only sound and vibration, but also light.
FIG. 7 is an exploded perspective showing the structure of a conventional
antenna 1 for mobile phone. The antenna 1 mainly includes a clear
hood 11, an antenna 12, a light-emitting element 13, a separating
plate 14, an insulating member 15, a signal needle 16, a coiled
member 17, and a base 18. The separating plate 14 is fixedly connected
to a top of the signal needle 16 for setting in the coiled member
17. The separating plate 14 prevents the antenna 12 from contacting
with the coiled member 17 and thereby protects the antenna 12 against
short circuit that would cause failure of the antenna 12 in receiving
and transmitting signals. An upper side of the separating plate
14 is electrically conductive for a lower end of the antenna 12
and a first pin of the light-emitting element 13 to fixedly weld
thereto. The base 18 is in the form of a funnel and is provided
with an axially extended through hole 181. The through hole 181
is provided on an inner peripheral wall with an insulting layer
to prevent the signal needle 16 located in the through hole from
unexpected contacting with the base 18 to result in short circuit
and failure in receiving and transmitting signals. The insulting
member 15 is a cylindrical member connected to and around the signal
needle 16, such that the insulting member 15 is set in an upper
end of the through hole 181. A second pin of the light-emitting
element 13 is welded to a top of the coiled member 17. The base
18 has an externally threaded portion for the base 18 to screw onto
a top of a mobile phone and contact with a negative electrode of
a power supply in the mobile phone. Finally, the clear hood 11 is
closed onto the base 18 to enclose the antenna 12.
The above-described conventional antenna for mobile phone has complicate
components that could not be easily assembled together, and therefore
requires increased manufacturing cost and selling price. The above-described
conventional antenna for mobile phone also has the following drawbacks:
1. The high number of complicate components tends to result in
errors in assembling the antenna to adversely affect the quality
of received signals.
2. In the conventional antenna that also emits lights, a voltage
signal at the output of the antenna has a maximum value equal to
a peak value Vm thereof, and only limited number of light-emitting
elements (loads) at the output can be driven by the output voltage
to emit lights.
In view of the drawbacks existing in the conventional antenna for
mobile phone, it is tried by the inventor to develop an improved
antenna for mobile phone to eliminate such drawbacks.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an antenna
for mobile phone that uses a printed circuit to replace the conventional
coil antenna, so as to reduce the manufacturing cost of the antenna
and increase the frequency stability thereof.
Another object of the present invention is to provide an antenna
for mobile phone that includes at least one light-emitting element
for emitting lights as an indicator of receiving signals.
To achieve the above and other objects, the antenna for mobile
phone according to the present invention mainly includes a low-profile
multi-layered circuit board mounted on a base and protectively covered
with a light-transmissible hood fitted around the base. The low-profile
multi-layered circuit board is provided at a reverse side with a
printed antenna and at a front side with a half-wave voltage-doubling
circuit and a light-emitting element. A power input of the half-wave
voltage-doubling circuit is replaced with a printed inductance for
inducing an alternating voltage and generating a resonance to eliminate
a capacitive reactance in a diode included in the circuit. The diode
rectifies the induced alternating voltage to a direct voltage for
driving the light-emitting element to emit lights. When additional
n diodes and n capacitances are parallelly connected to the half-wave
voltage-doubling circuit, a half-wave voltage-multiplying circuit
is constituted, so that an amplified output voltage (n+1)Vm times
as large as a received voltage signal can be obtained to drive multiple
light-emitting elements connected to the output of the circuit to
emit lights.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention
to achieve the above and other objects can be best understood by
referring to the following detailed description of the preferred
embodiments and the accompanying drawings, wherein
FIG. 1 is an exploded perspective of an antenna for mobile phone
according to a first embodiment of the present invention
FIG. 2 is an assembled perspective of the antenna of FIG. 1;
FIG. 3 is an assembled perspective of an antenna for mobile phone
according to a second embodiment of the present invention;
FIG. 4 is a circuit diagram showing the half-wave circuit adopted
in the present invention;
FIG. 5 is a circuit diagram showing the half-wave voltage-multiplying
circuit adopted in the present invention;
FIG. 6 shows the connection of an antenna of the present invention
to a mobile phone; and
FIG. 7 is an exploded perspective of a conventional antenna for
mobile phone.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to FIGS. 1 and 2 that are exploded and assembled perspective
views, respectively, of an antenna 2 for mobile phone according
to a first embodiment of the present invention. As shown, the antenna
2 mainly includes a light-transmissible hood 21, a low-profile multi-layered
circuit board 22, and a base 23. The light-transmissible hood 21
is a close-topped round tube adapted to connect a bottom thereof
to and around the base 23. The base 23 includes a round flat top
231 that is electrically conductive. The flat top 231 is provided
at an upper surface with a slot 232 into which the low-profile multi-layered
circuit board 22 is inserted, and at a lower surface with a downward
extended bolt 233. The low-profile multi-layered circuit board 22
is a rectangular board and is printed at a reverse side with a printed
antenna 221 and at a front side with a half-wave voltage-multiplying
circuit 224 and a light-emitting element 223. The antenna 2 assembled
from the above-mentioned components can be directly connected to
a mobile phone 3 by screwing the bolt 233 into an antenna hole 31
provided on the mobile phone 3, as shown in FIG. 6.
FIG. 3 shows an antenna for mobile phone according to a second
embodiment of the present invention. The antenna 2 in this second
embodiment is generally similar to the antenna 2 in the first embodiment,
except it uses a round flat-topped conductive seat 24 to replace
the base 23 in the first embodiment and further includes a retractable
support 25 and a base 26. The seat 24 is provided at its flat top
with a slot 241 into which the circuit board 22 is inserted, and
at its lower surface with a connecting head 242 for connecting an
upper end of the retractable support 25. The base 26 is provided
at a center with an axially extended through hole 261 and at a lower
surface with a downward extended bolt 262 adapted to screw into
the antenna hole 31 on the mobile phone 3. A lower end of the retractable
support 25 is downward extended through the through hole 261, such
that the retractable support 25 is axially movable in the through
hole 261 relative to the base 26.
FIG. 4 shows a half-wave circuit for the antenna of the present
invention. As shown, the half-wave circuit includes a printed antenna
221 provided at a reverse side of the low-profile multi-layered
circuit board 22, and a half-wave voltage-doubling circuit 222 and
a light-emitting element 223 provided at a front side of the low-profile
multi-layered circuit board 22.
The printed antenna 221 is provided at a reverse side of the low-profile
multi-layered circuit board 22 for receiving and transmitting high-frequency
signals and sending received voltage signals to an input of the
half-wave voltage-doubling circuit 222. The half-wave voltage-doubling
circuit 222 includes an inductance 2221 that replaces a power input
of the circuit 222 for inducing an alternating voltage, a diode
2222 and a capacitance 2223. The inductance 2221 resonates with
a sum of a micro capacitance in the diode 2222 and a capacitivity
of the capacitance 2223 and eliminates a capacitive reactance in
the diode 2222. The induced alternating voltage is rectified by
the diode 2222 to be direct voltage.
In the event there are multiple, for example, n+1 light-emitting
elements 223 to be driven, n diodes 2222 and n capacitances 2223
must be parallelly connected to the circuit 222 to constitute a
half-wave voltage-multiplying circuit 224, as shown in the frame
indicated with broken lines in FIG. 5, so that the half-wave voltage-multiplying
circuit 224 is able to amplify a received voltage signal to a maximum
output voltage that is (n+1)Vm times as large as the originally
received voltage signal to drive all the light-emitting elements
223 at the output of the half-wave circuit of the antenna for mobile
phone according to the present invention.
The light-emitting element 223 is a light emitting diode. When
a direct-voltage signal from the half-wave voltage-doubling circuit
222 or the half-wave voltage-multiplying circuit 224 drives the
light emitting diode 223, the light emitting diode 223 emits lights.
Since the half-wave voltage-multiplying circuit 224 is able to amplify
an input voltage Vm to output an amplified output voltage (n+1)Vm,
it is possible to provide multiple light emitting diodes (loads)
at the output of half-wave circuit of the present invention.
With the above arrangements, the antenna for mobile phone according
to the present invention provides at least the follow advantages:
1. Either the regular or the retractable antenna of the present
invention can be conveniently and quickly mounted on a mobile phone.
2. The antenna of the present invention adopts integrated printed
circuit and simple structure that facilitates reduction of manufacturing
cost and quick assembling of the antenna into a finish product for
mounting on a mobile phone and therefore benefits consumers.
3. The half-wave voltage-multiplying circuit of the present invention
provides an amplified output voltage (n+1)Vm times as large as the
received voltage. Therefore, multiple light emitting diodes (loads)
can be connected to the output of the circuit.
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