Communications: radio wave antennas – Antennas – High frequency type loops
Reexamination Certificate
2003-04-25
2004-06-29
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
High frequency type loops
C343S702000, C343S867000
Reexamination Certificate
active
06756946
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-loop antenna, especially to the antenna with two or more slices of conductors that connect with two or more antenna units that receiving signals of different frequencies, and thus achieving good capacity in receiving multiband frequency and/or broadband frequency.
2. Description of the Prior Art
The structure of an internal antenna in a mobile phone in prior art shown in
FIGS. 1A and 1B
. On top of the
FIG. 1A
is the antenna substrate
200
, and the grounding substrate
100
is beneath the antenna substrate
200
. The aforementioned substrates are connected by a component
300
. In general, as shown in
FIG. 1B
, the distance between the antenna substrate
200
and the grounding substrate
100
is extended in order to increase the bandwidth of the frequency. The longer the distance “d” is, the lower the equivalent value Q is, meanwhile, the frequency bandwidth of the signals is increased.
However, the thickness of a conventional mobile phone is limited, so the distance between the antenna substrate and the grounding substrate is restricted. Therefore, an idea of multi-loop structure of antenna circuit is invented to produce diverse combinations in neighboring antenna units in order to receive multi frequency. By the means of the multi-loop design, the antenna may receive frequency with multiband resonance.
A present structure of a conventional antenna is shown in
FIGS. 2A and 2B
. It is clearly shown that the present structure, which is on the antenna substrate
200
, comprising two antenna units
4
a
and
4
b
. Wherein, a longband antenna
4
a
is located in the outside of the antenna substrate
200
and connects to the grounding end, and a shortband antenna
4
b
is located in the inside of the antenna substrate
200
, connecting the feeding end. There is a conductor
4
c
mounted between the longband
4
a
and the shortband
4
a
. A current
900
may enter the feeding end, passing through shortband
4
a
, connecting conductor
4
c
and longband
4
b
, and then to the grounding end. Thus a complete circuit is formed.
In this type of sliced antenna in mobile phones, the position and the amount of the conductors
4
c
is fixed. Therefore, it can just form only one circuit and receive dual-band frequency.
Moreover, as the circuit of this type of antenna is fixed, the received dual frequency is also fixed. As a result, the frequency ratio cannot be tuned.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a multi-loop antenna, which increases the frequency bandwidth by means of the antenna units receiving different frequencies and being connected together. It is another object of the present invention to enable the adjustment of the proportion of the wideband/multiband frequencies by means of the antenna units connected by two or more conductors, wherein the antenna units, which receive different ranges of signals. According to the multi-loop antenna of the present invention, by means of two or more connecting conductors, different modules of connections may be accomplished, and the ability and flexibility of receiving wideband signals may also be achieved, and thus the frequency ratio and the flexibility of signal receiving are increased. It is a further object of the present invention.
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings in which:
REFERENCES:
patent: 5557293 (1996-09-01), McCoy et al.
patent: 6052091 (2000-04-01), Lee
patent: 6300914 (2001-10-01), Yang
patent: 6542126 (2003-04-01), Bahr et al.
patent: 6693594 (2004-02-01), Pankinaho et al.
Deng Sheng Ming
Tseug Horng-Wei
Chen Shih-Chao
Inpaq Technology Co. Ltd.
Troxell Law Office PLLC
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