Indian Patents. 235324:"AN ISOLATED NUCLEIC ACID COMPRISING SEQ ID NO.1 AND AN ISOLATED POLYPEPTIDE COMPRISING SEQ ID NO.2"

Title of Invention	"AN ISOLATED NUCLEIC ACID COMPRISING SEQ ID NO.1 AND AN ISOLATED POLYPEPTIDE COMPRISING SEQ ID NO.2"
Abstract	A microloop antenna includes a pair of symmetrical open loop radiators placed in a symmetrical position each having an opening oppositely facing each other and a pair of parallel ends extending toward a middle portion thereof and a pair of symmetrical feedlines symmetrically connected between the open loop radiators.

Full Text	A MICROLOOP ANTENNA BACKGROUND OF THE INVENTION The present invention relates to an antenna for a wireless communication system, and particularly to a microloop antenna for improving indoor radio communications. In recent years, wireless communication apparatuses such as cellular phones and Citizen's Band transceiver are commonly utilized to provide a consequent communication. However, as radio signals are often blocked' by walls of buildings, indoor communication quality is allways poor if there is no repeater installed in the buildings;. SUMMARY OF THE INVENTION An objective of the present invention is to provide a microloop antenna which is light in weight cind capable of providing a high communication quality. Another objective of the present invention is to provided a microloop antenna which is integrally formed with the communication apparatus. According to the present invention, a microloop antenna includes a pair of symmetrical opcsn Loop radiators placed in a symmetrical position each having an opening oppositely facing each other and a pair of parallel ends extending toward a middle portion thereon and a pair of symmetrical feedlines symmetrically connected between the open loop radiators. Other -objects, advantages, and novell features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS: Fig. 1 is a plan view of the microloop antenna of the present invention; Fig. 2 is a cross sectional view of the microloop antenna in cooperation with a release sheet; Fig. 3 ir a cross sectional view of another microloop antenna in cooperation with a release sheet; arid Fig. 4A-4D are plan views of radiators of other microloop antenna of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fig. 1 shows a plan view of one exemplary embodiment of a microloop antenna 100 according to this invention. The microloop antenna 100 includes two U-shaped loop radiators 10 and two feedlines 30 connected between the loop radiators 10. i The U-shaped loop radiators 10 and the :!eedlines 30 are symmetrically positioned with respect to eac:h of two mutually perpendicular axes X, Y intersecting at a middle point T of the microloop antenna 100. Each of the I'-shaped loop radiators 10 has an angled end 12 extending in a parallel relation toward the vertical axis Y (as shown) as to define a tuning capacitor. Preferably, a width W of the radiator 10 is about 1/Bμ to 1/10μ and a distance D between two radiators 10 is at least 1/15μ M is the wavelength at em anticipated operating frequency, such as when the operating frequency is 1.5 gigahertz;--the width W will be 2.5 centimeters while the operating frequency is 1.9 gigahertz, the width will be 2.0 centimeters. As shown, the feedlines 30 are in a square-step configuration, those skilled in the art will appreciate that the dimension of the feedlines 30 should be appropriately designed to match the impedance of the radiators. The feedlines 30 and the radiators 10 having the above-described configuration can be form€:d from a unitary sheet of conductive material such as gold, silver, copper, or aluminum or by forming said conductive material film on a plastic sheet using thin film forming me 1:hods such as deposition, plating, and sputtering and by patterning the film using photolithography or the like. Alternatively, the feedlines 30 and the radiators 10 may be formed by screen-printing a conductive material to provide the configuration as shown in Fig. 1. Referring to Fig. 2, the bottom side of the microloop antenna 10 0 is coated with an adhesive layer, 4 0 then the coated microloop antenna 100 is placed over a release sheet 50 for a user to easily adhere the antenna onto a back of a mobile phone (not shown) by peeling away th€; release sheet. Additionally, if the antenna 100 is deposited on a film 60 as previously mentioned, an adhesive layer 4 0 is coated on the bottom side of the film 60 then plated over a release sheet 50 as shown in Fig. 3 for a user to adhere the antenna 100 onto a back of the mobile phone by peeling away the release sheet 50. Alternatively, the antenna 100 may directly plated-on a back cover of a mobile phone if desired. Figs. 4A-4D show four individual configurations of the radiators according to the present invention, vrherein ends of each loop radiator 10 extend in parallel toward a central portion of the loop and define a tuning capacitor as previously mentioned. Alternatively, a sheet capacitor (not shown) may be used to replace the tuning cap-acitor defined in the radiator. Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed. I claim: 1. A microloop antenna, comprising: a pair of symmetrical open loop radiators placed in a symmetrical position each having an opening oppositely facing away each other and a pair of parallel ends extending toward a middle portion thereof; and a pair of symmetrical feedlines symmetrica1ly connected between the open loop radiators. 2. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines; a substantially square shaped area. 3. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines, a substantially circular shaped area. 4. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially rectangular shaped area. 5. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially octagonal shaped area. 6. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially triangular shaped area. 7. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially hexagonal shaped area. 8. A microloop antenna according to claim 2 wherein said square shaped area has a width of from one eighth to one tenth of wavelength of an operating frequency. 9. A microloop antenna according tc claim 4 wherein said rectangular shaped area has an edge symmetrical to the feedlines in length of from one eighth to one tenth of wavelength of an operating frequency. 10. A microloop antenna according to claim 1 wherein said symmetrically placed radiators have a distance of at i least one fifteenth of wavelength of an operating frequency. 11. A microloop antenna according to claim 1, wherein said loop radiators and feedlines are formed from a unitary sheet of conductive material. 12. A microloop antenna according to claim 1, wherein said loop radiators and feedlines are formed on a plastic sheet by using thin film deposition of a conductive material. 13. A microloop antenna according to claim 1, wherein said feedline is a square step configuration. 14. A microloop antenna, aubstantially as herein described, with reference to the accompanying drawings.

Full Text

A MICROLOOP ANTENNA
BACKGROUND OF THE INVENTION
The present invention relates to an antenna for a wireless communication system, and particularly to a microloop antenna for improving indoor radio communications.
In recent years, wireless communication apparatuses such as cellular phones and Citizen's Band transceiver are commonly utilized to provide a consequent communication. However, as radio signals are often blocked' by walls of buildings, indoor communication quality is allways poor if there is no repeater installed in the buildings;. SUMMARY OF THE INVENTION
An objective of the present invention is to provide a microloop antenna which is light in weight cind capable of providing a high communication quality.
Another objective of the present invention is to provided a microloop antenna which is integrally formed with the communication apparatus.
According to the present invention, a microloop antenna includes a pair of symmetrical opcsn Loop radiators placed in a symmetrical position each having an opening oppositely facing each other and a pair of parallel ends extending toward a middle portion thereon and a pair of symmetrical feedlines symmetrically connected between the open loop radiators.
Other -objects, advantages, and novell features of the invention will become more apparent from the following detailed description when taken in conjunction with the

accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 is a plan view of the microloop antenna of the present invention;
Fig. 2 is a cross sectional view of the microloop antenna in cooperation with a release sheet;
Fig. 3 ir a cross sectional view of another microloop antenna in cooperation with a release sheet; arid
Fig. 4A-4D are plan views of radiators of other microloop antenna of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 shows a plan view of one exemplary embodiment
of a microloop antenna 100 according to this invention. The
microloop antenna 100 includes two U-shaped loop radiators 10
and two feedlines 30 connected between the loop radiators 10.
i
The U-shaped loop radiators 10 and the :!eedlines 30 are symmetrically positioned with respect to eac:h of two mutually perpendicular axes X, Y intersecting at a middle point T of the microloop antenna 100. Each of the I'-shaped loop radiators 10 has an angled end 12 extending in a parallel relation toward the vertical axis Y (as shown) as to define a tuning capacitor. Preferably, a width W of the radiator 10 is about 1/Bμ to 1/10μ and a distance D between two radiators 10 is at least 1/15μ M is the wavelength at em anticipated operating frequency, such as when the operating frequency is 1.5 gigahertz;--the width W will be 2.5 centimeters while the operating frequency is 1.9 gigahertz, the width will be 2.0 centimeters.

As shown, the feedlines 30 are in a square-step configuration, those skilled in the art will appreciate that the dimension of the feedlines 30 should be appropriately designed to match the impedance of the radiators.
The feedlines 30 and the radiators 10 having the above-described configuration can be form€:d from a unitary sheet of conductive material such as gold, silver, copper, or aluminum or by forming said conductive material film on a plastic sheet using thin film forming me 1:hods such as deposition, plating, and sputtering and by patterning the film using photolithography or the like. Alternatively, the feedlines 30 and the radiators 10 may be formed by screen-printing a conductive material to provide the configuration as shown in Fig. 1.
Referring to Fig. 2, the bottom side of the microloop antenna 10 0 is coated with an adhesive layer, 4 0 then the coated microloop antenna 100 is placed over a release sheet 50 for a user to easily adhere the antenna onto a back of a mobile phone (not shown) by peeling away th€; release sheet.
Additionally, if the antenna 100 is deposited on a film 60 as previously mentioned, an adhesive layer 4 0 is coated on the bottom side of the film 60 then plated over a release sheet 50 as shown in Fig. 3 for a user to adhere the antenna 100 onto a back of the mobile phone by peeling away the release sheet 50. Alternatively, the antenna 100 may directly plated-on a back cover of a mobile phone if desired.
Figs. 4A-4D show four individual configurations of the radiators according to the present invention, vrherein ends of

each loop radiator 10 extend in parallel toward a central portion of the loop and define a tuning capacitor as previously mentioned. Alternatively, a sheet capacitor (not shown) may be used to replace the tuning cap-acitor defined in the radiator.
Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.

I claim:
1. A microloop antenna, comprising:
a pair of symmetrical open loop radiators placed in a symmetrical position each having an opening oppositely facing away each other and a pair of parallel ends extending toward a middle portion thereof; and
a pair of symmetrical feedlines symmetrica1ly connected between the open loop radiators.
2. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines; a substantially square shaped area.
3. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines, a substantially circular shaped area.
4. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially rectangular shaped area.
5. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially octagonal shaped area.
6. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially triangular shaped area.
7. A microloop antenna according to claim 1 wherein said symmetrical open loop radiator defines a substantially hexagonal shaped area.
8. A microloop antenna according to claim 2 wherein said square shaped area has a width of from one eighth to one

tenth of wavelength of an operating frequency.
9. A microloop antenna according tc claim 4 wherein
said rectangular shaped area has an edge symmetrical to the
feedlines in length of from one eighth to one tenth of
wavelength of an operating frequency.
10. A microloop antenna according to claim 1 wherein
said symmetrically placed radiators have a distance of at
i
least one fifteenth of wavelength of an operating frequency.
11. A microloop antenna according to claim 1, wherein said loop radiators and feedlines are formed from a unitary sheet of conductive material.
12. A microloop antenna according to claim 1, wherein said loop radiators and feedlines are formed on a plastic sheet by using thin film deposition of a conductive material.
13. A microloop antenna according to claim 1, wherein said feedline is a square step configuration.
14. A microloop antenna, aubstantially as herein described, with reference to the accompanying drawings.

Documents:

in-pct-2002-134-che-abstract.pdf

in-pct-2002-134-che-claims.pdf

in-pct-2002-134-che-correspondance others.pdf

in-pct-2002-134-che-correspondance po.pdf

in-pct-2002-134-che-description complete .pdf

in-pct-2002-134-che-form 1.pdf

in-pct-2002-134-che-form 19.pdf

in-pct-2002-134-che-form 3.pdf

in-pct-2002-134-che-pct.pdf

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Patent Number

235324

Indian Patent Application Number

IN/PCT/2002/134/CHE

PG Journal Number

29/2009

Publication Date

17-Jul-2009

Grant Date

30-Jun-2009

Date of Filing

24-Jan-2002

Name of Patentee

BASF AKTIENGESELLSCHAFT

Applicant Address

D-67056 Ludwigshafen

Inventors:

#	Inventor's Name	Inventor's Address
1	POMPEJUS, Markus	Wenjenstrasse 21, D-67251 Freinsheim
2	KROGER, Burkhard	Im Waldhof 1, D-67117 Limburgerhof
3	SCHRODER, Hartwig	Goethestrasse 5, D-69226 Nussloch
4	ZELDER, Oskar	Rossmarktstrasse 27, D-67346 Speyer
5	HABERHAUER, Gregor	Moselstrasse 42, D-67117 Limburgerhof

PCT International Classification Number

C12N15/31

PCT International Application Number

PCT/IB00/00911

PCT International Filing date

2000-06-23

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	199 32 125.6	1999-07-09	Denmark
2	19933006.9	1999-07-14	Denmark
3	19941378.9	1999-08-31	Denmark
4	19941379.7	1999-08-31	Denmark
5	19941390.8	1999-08-31	Denmark