Source: http://www.google.com/patents/US20070057846?dq=552685
Timestamp: 2015-05-06 05:24:45
Document Index: 1811555

Matched Legal Cases: ['art. 5', 'art. 7', 'art. 13', 'art. 15', 'art. 22', 'art. 24', 'art. 29', 'art 10', 'art 11', 'art 10', 'art 10', 'art 11', 'art 10', 'art 11', 'art 10', 'art 11', 'art 11', 'art 11', 'art 10', 'art 11', 'art 10', 'art 11', 'art 10', 'art 10', 'art 11', 'art 10', 'art 10', 'art 111', 'art 112', 'art 113', 'art 10', 'art 10', 'art 111', 'art 10', 'art 111', 'art 10', 'art 111', 'art 111', 'art 112', 'art 10', 'art 112', 'art 10', 'art 112', 'art 112', 'art 113', 'art 10', 'art 113', 'art 10', 'art 113', 'art 113', 'art 10']

Patent US20070057846 - Symmetric-slot monopole antenna - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA symmetric-slot monopole antenna is provided, including a metallic board. Formed on the metallic board are a ground connection part to provide a ground circuit for the monopole antenna and a radiation part formed integrally on the ground connection part to receive and radiate signals transmitted through...http://www.google.com/patents/US20070057846?utm_source=gb-gplus-sharePatent US20070057846 - Symmetric-slot monopole antennaAdvanced Patent SearchPublication numberUS20070057846 A1Publication typeApplicationApplication numberUS 11/225,182Publication dateMar 15, 2007Filing dateSep 14, 2005Priority dateSep 14, 2005Also published asUS7358900Publication number11225182, 225182, US 2007/0057846 A1, US 2007/057846 A1, US 20070057846 A1, US 20070057846A1, US 2007057846 A1, US 2007057846A1, US-A1-20070057846, US-A1-2007057846, US2007/0057846A1, US2007/057846A1, US20070057846 A1, US20070057846A1, US2007057846 A1, US2007057846A1InventorsJia-Jiu Song, Jr-Ren JengOriginal AssigneeJia-Jiu Song, Jr-Ren JengExport CitationBiBTeX, EndNote, RefManReferenced by (1), Classifications (9), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetSymmetric-slot monopole antenna
US 20070057846 A1Abstract
A symmetric-slot monopole antenna is provided, including a metallic board. Formed on the metallic board are a ground connection part to provide a ground circuit for the monopole antenna and a radiation part formed integrally on the ground connection part to receive and radiate signals transmitted through a signal cable. Images(8) Claims(30)
1. A symmetric-slot monopole antenna comprising: a metallic board having a ground connection part and a radiation part formed thereon, wherein the ground connection part is formed integrally with the radiation part and the radiation part receives and radiates a signal. 2. The symmetric-slot monopole antenna according to claim 1, further comprising two impedance matching slots formed on the metallic board to match the impedance of the symmetric-slot monopole antenna. 3. The symmetric-slot monopole antenna according to claim 1, wherein the radiation part is of a length of � λ (wavelength). 4. The symmetric-slot monopole antenna according to claim 1, wherein the radiation part is formed perpendicular to the plane of the ground connection part. 5. The symmetric-slot monopole antenna according to claim 1, wherein the radiation part has a signal-feeding hole to connect to a signal terminal of a signal cable. 6. The symmetric-slot monopole antenna according to claim 5, wherein a ground connection terminal of the signal cable is connected to the ground connection part. 7. The symmetric-slot monopole antenna according to claim 1, wherein the radiation part is in the shape of a strip. 8. The symmetric-slot monopole antenna according to claim 1, wherein the radiation part is in the shape of a �T.�
9. A symmetric-slot monopole antenna comprising: a metallic board having a ground connection part and a radiation part formed thereon, wherein the ground connection part is connected to the radiation part by means of welding and the radiation part receives and radiates a signal. 10. The symmetric-slot monopole antenna according to claim 9, further comprising two impedance matching slots formed on the metallic board to match the impedance of the symmetric-slot monopole antenna. 11. The symmetric-slot monopole antenna according to claim 9, wherein the radiation part is of a length of � λ (wavelength). 12. The symmetric-slot monopole antenna according to claim 9, wherein the radiation part is formed perpendicular to the plane of the ground connection part. 13. The symmetric-slot monopole antenna according to claim 9, wherein the radiation part has a signal-feeding hole to connect to a signal terminal of a signal cable. 14. The symmetric-slot monopole antenna according to claim 13, wherein a ground connection terminal of the signal cable is connected to the ground connection part. 15. The symmetric-slot monopole antenna according to claim 9, wherein the radiation part in the shape of strip. 16. The symmetric-slot monopole antenna according to claim 9, wherein the radiation part is in the shape of a �T.�
17. A symmetric-slot monopole antenna comprising: a metallic board having a ground connection part and at least one radiation part, wherein each of the at least one radiation part is integrally formed with the ground connection part and each of the at least one radiation part receives and radiates a signal. 18. The symmetric-slot monopole antenna according to claim 17, wherein the symmetric-slot monopole is an MIMO (multi-input multi-output) antenna. 19. The symmetric-slot monopole antenna according to claim 17, wherein each of the at least one radiation part corresponds to two impedance matching slots, and each of the two impedance matching slots is formed on the metallic board to match the impedance of the symmetric-slot monopole antenna. 20. The symmetric-slot monopole antenna according to claim 17, wherein each of the radiation part is of a length of �λ (wavelength). 21. The symmetric-slot monopole antenna according to claim 17, wherein the each of the at least radiation part is formed perpendicular to the plane of the ground connection part. 22. The symmetric-slot monopole antenna according to claim 17, wherein the each of the at least one radiation part has a signal-feeding hole to connect to a signal terminal of a signal cable. 23. The symmetric-slot monopole antenna according to claim 22, wherein a ground connection terminal of the signal cable is connected to the ground connection part. 24. A symmetric-slot monopole antenna comprising: a metallic board having a ground connection part and at least one radiation part formed thereon, wherein each of the at least one radiation part is connected to the ground connection part by means of welding and the each of the at least one radiation parts receives and radiates a signal. 25. The symmetric-slot monopole antenna according to claim 24, wherein the symmetric-slot monopole antenna is an MIMO (multi-input multi-output) antenna. 26. The symmetric-slot monopole antenna according to claim 24, wherein the each of the at least one radiation part corresponds to two impedance matching slots and each of the two impedance matching slots is formed on the metallic board to match the impedance of the symmetric-slot monopole antenna. 27. The symmetric-slot monopole antenna according to claim 24, wherein the each of the at least one radiation part is of a length of �λ (wavelength). 28. The symmetric-slot monopole antenna according to claim 24, wherein the each of the at least one radiation part is formed perpendicular to the plane of the ground connection part. 29. The symmetric-slot monopole antenna according to claim 24, wherein the each of the at least one radiation part has a signal-feeding hole to connect to a signal terminal of a signal cable. 30. The symmetric-slot monopole antenna according to claim 29, wherein a ground connection terminal of the signal cable is connected to the ground connection part.
BACKGROUND OF THE INVENTION 1. Field of Invention The present invention relates to a monopole antenna, more particularly, to a symmetric-slot monopole antenna. 2. Related Art With the development of wireless communication, miniaturization is the trend of the design of electronic devices. In order to comply with the trend, the size of antenna needs to decrease. At present, the widely used small-sized antenna include planar antenna and chip antenna. There are many types of planar antenna, such as micro-strip antenna, printed antenna, and planar inverted-F antenna (PIFA). In general, printed dipole antenna are commonly used in wireless communication devices. In terms of its design, a dipole antenna has a radiation part that extends to the two ends of the antenna and therefore is of a long antenna structure. Thus, the miniaturization of electronic devices for wireless communication are hard to realize. Further, the manufacture of printed antenna is complicated and is costly. In order to increase the speed of wireless transmission, MIMO (multiple-input multiple-output) antennas have become increasingly popular. An MIMO antenna uses a plurality of independent antennas which are connected separately to different signal processing circuits. As an example, for an MIMO antenna with three independent antennas, two of the independent antennas are used to transmit signals and the other one is used to receive signals. By assigning different functions to different independent antennas, the speed of signal-transmission is increased. Under this situation, if the above-described printed antenna structure was adopted, the overall size of the antenna would be even larger, and the current demand for miniaturization of electronic devices could not be met. Therefore, how to provide a low-cost and easy-to-produce antenna has become an important topic of research. SUMMARY OF THE INVENTION In order to solve the problems above, one objective of the present invention is to provide a symmetric-slot monopole antenna made from a metallic material and made integrally to replace printed antenna, to thereby reduce the manufacturing cost and simplify the manufacturing processes. In order to achieve this objective, a symmetric-slot monopole antenna includes a metallic board having a ground connection part and a radiation part. The ground connection part has a long narrow slot connected to the ground connection terminal of the signal cable to provide a ground circuit. The ground connection part may be of any geometric shape (e.g., triangle, rectangle, circle, or half circle). The radiation part is formed integrally with the ground connection part and has a signal feeding hole connected to the signal terminal of the signal cable. The radiation part is formed perpendicular to the plane of the ground connection part to receive and radiate signals and the length of the radiation part is �λ (wavelength). Further, the radiation part may be connected to the ground connection part by means of welding (i.e., non-integral structure). The symmetric-slot monopole antenna may include two impedance matching slots formed on a metallic board, with the two impedance matching slots corresponding to a long narrow slot of the ground connection part to match the impedance of the symmetric-slot monopole antenna. Further, in order to achieve the above objective, in another exemplary embodiment of the present invention, the symmetric-slot monopole antenna of the present invention includes a metallic board having a ground connection part and more than one radiation part. The ground connection part has more than one long narrow slot connected to the ground connection terminal of the signal cable to provide a ground circuit. The ground connection part may be any of geometric shape (e.g., triangle, rectangle, circle, or half circle). More than one radiation part is formed integrally on the ground connection part, wherein each radiation part has a signal-feeding hole connected to the signal terminal of the signal cable. The radiation parts are formed perpendicular to the plane of the ground connection part to receive and radiate signals, with the length of each radiation part being � λ (wavelength). Further, each radiation part may be formed on the ground connection part by means of welding (i.e., a non-integral structure). The above-described symmetric-slot monopole antenna is an MIMO antenna. Each radiation part corresponds to two impedance matching slots and each of the impedance matching slots is formed on a metallic board and corresponds to a long narrow slot on the ground connection part to match the impedance of the symmetric-slot monopole antenna. The symmetric-slot monopole antenna according to the exemplary embodiments of the present invention may replace printed dipole antenna to therefore reduce the size of antenna, and further reduce the cost and simplify the processes of antenna manufacture. Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more fully understood from the detailed description given hereinbelow illustration only, and thus are not limitative of the present invention, and wherein: FIG. 1A is a plan view of a symmetric-slot monopole antenna according to a first exemplary embodiment of the present invention. FIG. 1B is a three-dimensional view of the symmetric-slot monopole antenna according to a first exemplary embodiment according to the present invention. FIG. 2A is a three-dimensional view of a symmetric-slot monopole antenna according to a second exemplary embodiment of the present invention. FIG. 2B is a three-dimensional view of a symmetric-slot monopole antenna according to a modified second exemplary embodiment of the present invention. FIG. 2C is a three-dimensional view of a symmetric-slot monopole antenna according to a modified second exemplary embodiment of the present invention. FIG. 2D is a three-dimensional view of a symmetric-slot monopole antenna according to a modified first exemplary embodiment of the present invention. FIG. 3A illustrates the radiation pattern of an antenna according to a first exemplary embodiment of the present invention. FIG. 3B illustrates the radiation pattern of an antenna according to a first exemplary embodiment of the present invention. FIG. 3C illustrates the radiation pattern of an antenna according to a second exemplary embodiment of the present invention. FIG. 3D illustrates the radiation pattern of the antenna according to a second exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a plan view of a first exemplary embodiment according to the present invention. In FIG. 1, the symmetric-slot monopole antenna 50 is made from a metallic board (e.g., copper board or steel board.). A ground connection part 10, a radiation part 11, and an impedance matching slot 12 are formed on the metallic board. The ground connection part 10 has a long narrow slot 10 a connected to the ground connection terminal 20 a of the signal cable 20 to provide a ground circuit for the symmetric-slot monopole antenna 50. The ground connection part 10 may be of any geometric shape (e.g., a triangle, a rectangle, a circle, or a half circle). The radiation part 11 is formed integrally with the ground connection part at the end of the long narrow slot 10 a and may be folded up to a position approximately perpendicular to the plane of the ground conncetion part 10 as shown in FIG. 1 B to receive and radiate signals. When the radiation part 11 is not folded up, each of its two sides is separated from the ground connection part 10 by a distance d, with the length of the radiation part 11 being �λ (wave-length). The radiation part 11 has a signal-feeding hole 11 a to provide a connection between the symmetric-slot monopole antenna 50 and the signal terminal 20 b of the signal cable 20 to receive signals. Further, the radiation part 11 may be of a narrow strip shape or any other geometric shape, and may be further folded to reduce the size of the symmetric-slot monopole antenna 50. Formed on the ground connection part 10, the impedance matching slot 12 symmetrically corresponds to the long narrow slot 10 a. By adjusting the shape, size, quantity, and/or angel of the impedance matching slot 12, the impedance value and the radiation pattern of the monopole antenna may be changed. FIG. 1B is a three-dimensional view of the first exemplary embodiment according to the present invention. The radiation part 11 is formed by means of cutting out a long narrow slot 10 a on the ground connection part 10. Then the radiation part 11 is folded up to a position approximately perpendicular to the plane of the ground connection part 10, while the signal feeding hole 11 a is connected to the signal terminal 20 b of the signal cable 20 to receive signals. The ground connection terminal 20 a of the signal cable 20 is connected to the ground connection part 10. Therefore, the symmetric-slot monopole antenna 50 has a length of only half of that of a dipole antenna, and its size is thus significantly reduced. Further, the radiation part 11 may be formed on the ground connection part 10 by means of welding (i.e., non-integral structure), which will not affect the radiation pattern of the monopole antenna. FIG. 2A is a three-dimensional view of a second exemplary embodiment of the present invention. In FIG. 2A, the symmetric-slot monopole antenna 60 is made from a metallic board (e.g. copper board or steel board) and is an MIMO (multi-input multi-output) antenna. Formed on the metallic board are a ground connection part 10, a first radiation part 111, a second radiation part 112, and a third radiation part 113. The ground connection part 10 includes a first long narrow slot 101, a second long narrow slot 102, and a third long narrow slot 103 connected to the ground connection terminal of the signal cable 20 (for simplicity, only one signal cable is depicted in FIG. 2A) to provide a ground circuit for the symmetric-slot monopole antenna 60. The ground connection part 10 may be of any geometric shape (e.g., triangle, rectangle, circle, or half circle). The first radiation part 111 is formed integrally with the ground connection part 10 and connected to the end of the first slot 101. The first radiation part 111 corresponds to an impedance matching hole 121 and may be folded up to a position approximately perpendicular to the plane of the ground connection part 10 to receive and radiate signals. The first radiation part 111 is of a length of � λ (wave-length), and has a signal feeding hole 111 a to provide a connection between the symmetric-slot monopole antenna 60 and the signal terminal 20 b of the signal cable 20 to receive signals. Further, the first radiation part 111 may be in a shape of a strip or any other geometric shape, and may even be folded, which reduces the size of the symmetric-slot monopolo antenna 60. The second radiation part 112 is formed integrally with the ground connection part 10 and connected to the end of the second long narrow slot 102, and corresponds to the impedance matching slot 122. The second radiation part 112 may be folded up in a position approximately perpendicular to the plane of the ground connection part 10 to receive and radiate the signals. The length of the second radiation part 112 is � λ (wavelength), and has a signal feeding hole 112 a to provide a connection between the signal terminal 20 b of the signal cable 20 and the symmetric-slot monopole antenna 60 to receive signals. Further, the second radiation part 112 may be in the shape of a strip or any other geometric shape, and may even be folded, which may reduce the size of the symmetric-slot monopole antenna 60. The third radiation part 113 is formed integrally with the ground connection part 10 and connected to the end of the third long narrow slot 103, and corresponds to the impedance matching slot 123. The third radiation part 113 may be folded up to a position approximately perpendicular to the plane of the ground connection part 10 to receive and radiate signals. The third radiation part 113 is of a length of � λ (wavelength), and has a signal feeding hole to provide a connection between the signal terminal 20 b of the signal cable 20 and the symmetric-slot monopole antenna 60 to receive signals. Further, the third radiation part 113 may be in the shape of a strip or any other geometric shape, and may even be folded, which may reduce the size of the symmetric-slot monopole antenna. Each of the radiation parts may be formed on the ground connection part 10 by means of welding (i.e., non-integral structure), which will not effect the radiation pattern of the monopole antenna. Further, the number of radiation parts in the second exemplary embodiment may be increased to four as shown in FIG. 2. The radiation part may be designed to be in the shape of a �T� as shown in FIG. 2C. Multiple symmetric-slot monopole antenna 50 according to the first exemplary embodiment of the present invention may be arranged in a row or a column as shown in FIG. 2D to form an MIMO (multi-input multi-output) antenna. FIG. 3A illustrates the radiation pattern of an H-polarized antenna at a frequency of 2.4 GHz according to the first exemplary embodiment of the present invention. FIG. 3B illustrates the radiation pattern of a V-polarized antenna at a frequency of 2.4 GHz according to the first exemplary embodiment of the present invention. FIG. 3C illustrates the radiation pattern of an H-polarized antenna at a frequency of 2.4 GHz according to the second exemplary embodiment of the present invention. FIG. 3D illustrates the radiation pattern of a V-polarized antenna at a frequency of 2.4 GHz according to the second exemplary embodiment of the present invention. The symmetric-slot monopole antenna according to the exemplary embodiments of the present invention may replace the printed dipole antenna to therefore reduce the size of antenna, and further reduce the cost and simplify the processes of antenna manufacture. The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. Referenced byCiting PatentFiling datePublication dateApplicantTitleUS20120139806 *Nov 30, 2011Jun 7, 2012Ying ZhanIFS BEAMFORMING ANTENNA FOR IEEE 802.11n MIMO APPLICATIONS* Cited by examinerClassifications U.S. Classification343/700.0MS, 343/860International ClassificationH01Q9/04Cooperative ClassificationH01Q21/28, H01Q9/36, H01Q9/30European ClassificationH01Q9/36, H01Q21/28, H01Q9/30Legal EventsDateCodeEventDescriptionJun 5, 2012FPExpired due to failure to pay maintenance feeEffective date: 20120415Apr 15, 2012LAPSLapse for failure to pay maintenance feesNov 28, 2011REMIMaintenance fee reminder mailedSep 14, 2005ASAssignmentOwner name: SMARTANT TELECOM CO., LTD., TAIWANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SONG, JIA-JIU;JENG, JR-REN;REEL/FRAME:016982/0425Effective date: 20050818RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services