Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-12-21
2003-02-04
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S767000, C343S895000
Reexamination Certificate
active
06515626
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an antenna for a mobile station; and, more particularly, to a planar microstrip patch antenna having improving antenna efficiency and high gain, and arranged for installation in a mobile station.
DESCRIPTION OF THE PRIOR ART
In recent years, mobile stations are used in both a personal communication service (PCS) and a wireless local loop (WLL) in which a different communication frequencies are used. Thus, it is necessary for an antenna to operate in frequency corresponding to each service.
Among the antennae for satisfying the above, a helical antenna is popularly used in the mobile station at the present time. One type is capable of being operated as a helical antenna at a retraction state and operated as a combination of the helical antenna and a monopole antenna in an extended state. In this antenna device, a housing of the handheld mobile station is generally used as a ground plane.
Referring to
FIGS. 1A and 1B
, there is shown the conventional helical antenna
100
for the mobile station, wherein each figure illustrates the antenna in a retracted state and extended state, respectively. The helical antenna of the previous art includes a rod antenna
8
having a conductive core
12
therein and a insulator
14
covering the outside of the conductive core
12
, a support member
10
for supporting the rod antenna
8
, made of an insulating and a non-magnetic material, a button
16
for functioning as a gripper for extending and retracting the rod antenna
8
, a helical antenna
6
made of a resilient metal wire in a spiral shape, a hood
18
having an aperture
20
on the top thereof, made of an insulating and a non-magnetic material, a contact washer
22
made of metal, for being in galvanic contact with the helical antenna
6
and an abutment
28
in the transition region between the lower and upper regions of the rod antenna. The abutment
28
plays a role in lifting the contact washer
16
so that the helical wire is compressed as shown in FIG.
1
B.
The connecting portion
26
is galvanically directly connected to the transceiver
2
. In the active state of the helical antenna
6
, the contact washer
22
abuts against the contact device
24
so that galvanic connection is obtained between the helical antenna
6
and the connecting portion
26
and thereby also direct to the transceiver
2
. Whereas, in the passive state, i.e., the extended state, the helical antenna
6
is galvanically separated from the transceiver
2
.
In the helical antenna device
100
, there are several drawbacks such that the mobile station is hardly miniaturized because the antenna is attached on the exterior of the mobile station and a user's head is subjected to an electromagnetic wave due to a concentration of the radiation near the center of the antenna. Moreover, the helical antenna device
100
also has a problem that radiation efficiency is decreased because the radiation of the antenna is disturbed by the user.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a planar microstrip patch antenna for improving antenna efficiency and gain by implementing a microstrip patch formed in a shape of a zigzag conduction or an H-slot.
In accordance with one aspect of the present invention, there is provided a planar microstrip patch antenna, comprising: a substrate made of a dielectric material; a microstrip patch, made of a conductive metal, formed on the substrate; a feeding conductor to electrically connect to an end of the microstrip patch; and a ground face disposed on a side of the substrate.
REFERENCES:
patent: 4644343 (1987-02-01), Schneider et al.
patent: 5760747 (1998-06-01), McCoy et al.
patent: 5872542 (1999-02-01), Simons et al.
patent: 5914693 (1999-06-01), Takei et al.
patent: 5926139 (1999-07-01), Korisch
patent: 6028567 (2000-02-01), Lahti
patent: 6078823 (2000-06-01), Chavez et al.
patent: 6081241 (2000-06-01), Josefsson et al.
patent: 6091366 (2000-07-01), Zhang et al.
patent: 6111545 (2000-08-01), Saari
Bark Hang-Gu
Kim Dong-Sob
Yoon Hyun-Bo
Baker & Botts LLP
Ho Tan
Hyundai Electronics Industries
LandOfFree
Planar microstrip patch antenna for enhanced antenna... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Planar microstrip patch antenna for enhanced antenna..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planar microstrip patch antenna for enhanced antenna... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3138482