Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
  • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
  • H01Q11/08—Helical antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
  • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
  • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
  • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/10—Resonant slot antennas
  • H01Q13/12—Longitudinally slotted cylinder antennas; Equivalent structures
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line

Definitions

• the present invention relates generally to the field of wireless communication, and particularly to the design of an antenna.
• an antenna comprises a first plate and a second plate, the combination of the first and second plates serving as a capacitive
• an antenna structure produces a spiral current distribution by forming three plates in which a first plate overlaps with a
• spiral-type of current distribution Although the spiral current distribution is described, other shapes of current distribution, such as circular, can be practiced
• a metallic border has a width comparable to
• the spiral sheet antenna structure can
• ratio of 5dB can be achieved by an asymmetric shield structure.
• the form of asymmetric structure is mathematically and geometrically specified by a geometrical
• two holes or openings are asymmetrically placed so that they tend to face in the same direction, and away from the absorber.
• both openings are facing in the same direction.
• a spiral sheet antenna forms the outer
• the antenna is designed with at least two holes
• System components are in the form of a double sided circuit board, but a complete integrated
• the antenna comprises a metallic structure with two or more openings, at least one seam
• the present invention discloses an antenna structure that is
• the present invention further advantageously reduces the cost of building an antenna by using air as the
• the present invention provides a shield to block radio energy
• the present invention also designs an antenna structure in which radio energy tends to flow in the direction away from a person. Furthermore, the present invention
• FIG. 1 is a pictorial diagram illustrating a cross-sectional view of a spiral sheet
• the overlapping plates 11 and 12 form a seam between the two openings
• FIGS. 2A-2B are pictorial diagrams illustrating a perspective view of two similar antenna structures having different aspect ratio in length and width, respectively, of a spiral sheet antenna for producing a spiral sheet current distribution in accordance with the present invention.
• FIG. 3 is a pictorial diagram illustrating a first possible drive configuration for a spiral sheet antenna in accordance with the present invention.
• FIG. 4 is a pictorial diagram illustrating a second possible drive configuration
• FIG. 5 is a pictorial diagram illustrating a first embodiment of a cylinder-like
• antenna having two holes at the ends, with a seam between the two holes for producing a circular current distribution with a double parallel plate in accordance
• FIG. 6 is a pictorial diagram illustrating a perspective view of a cylinder-like
• antenna having two holes at the ends, with a seam between the two holes for producing a circular current distribution with a double parallel plate in accordance
• FIGS. 7A-7B are pictorial diagrams illustrating a perspective view and a cross-
• FIG. 8 is a pictorial diagram illustrating a third embodiment of a magnetic
• dipole sheet antenna having two holes at the ends, with a slot seam between the two
• FIGS. 9A-9B are pictorial diagrams illustrating a perspective view and a side
• FIGS. 10A-10B are pictorial diagrams illustrating side views of an operational
• FIG. 11 is a pictorial diagram illustrating an operational procedure for
• FIGS. 12A-12B are pictorial diagrams illustrating a second embodiment of a shielded spiral sheet antenna with overlapping capacitive seam structure in
• FIG. 12B is a side cross-section view showing
• FIG. 13 is a pictorial diagram illustrating a multi-frequency, multi-tap antenna
• FIG. 14 is a pictorial diagram illustrating the placement of internal circuit boards inside an antenna m accordance with the present invention.
• FIG. 1 is a pictorial diagram illustrating a cross-sectional view of a spiral sheet
• antenna 10 resembling a rectangular cylindrical shape, with two holes at the ends, and a capacitive seam connecting the two holes, for producing a cylindrical current
• the spiral sheet antenna 10 can be constructed with three plates, a first
• variable d 14 represents the
• a vertical connection 16 connects between the third plate 13 and the first plate 11, while the third plate 13 connects to the second plate 12 via a vertical connection 17.
• the length of the third plate 13, between vertical connections 16 and 17 is selected to be less than a quarter wavelength, ⁇ /4n,
• n is the square root of the dielectric constant
• the structure of the spiral sheet antenna 10 increases the effective dielectric
• FIGS. 2A is a pictorial diagram illustrating a perspective view of a spiral
• the spiral sheet antenna 20 for producing a cylinder-like current distribution.
• antenna 20 has a first hole 21 and a second hole 22, at the ends, and a capacitive seam
• the alternating current (AC) magnetic field vector B is
• FIG. 2B is a pictorial diagram illustrating a spiral sheet antenna 25 for
• FIG. 2B The structure shape in FIG. 2B is the same as the
• the curved vector I represents the general direction of the
• the spiral antennas 20 and 25 in FIGS. 2 A and 2B operate like a single-turn
• a single-turn solenoid consists of a cylinder-like current distribution.
• a 2A the aspect ratio, in FIG. 2B, is different from the aspect ratio in FIG. 2A.
• the curved vector I represents, (he general direction of the AC currents.
• the spiral antennas 20 and 25 in FIGS. 2A and 2B operate like a single-turn solenoids.
• a single-tum solenoid consists of a cytinder like current distribution.
• the antennas 20 and 25 do not require a high dielectric constant ceramic to attain a small dimensional size.
• the inherent capacitance in the structure of the antennas 20 and 25 allows a low frequency operation according to the formula:
• C is the capacitance from the thin overlapping region labeled as the thickness d 15, or the spacing 14.
• FIG. 3 is a pictorial diagram illustrating a first drive or feed configuration 30 for a spiral sheet antenna producing a cylindrical current distribution.
• the first drive configuration 30 has a first plate 31, a second plate 32, a third plate 33, a first hole 34, and a second hole 35.
• a drive cable 36 attaches and drives the spiral sheet antenna 20.
• the co-axial drive cable 36 matches any desired input impedance.
• An optional vertical short circuit wire, 37, can assist in providing an impedance matching shunt to the spiral ⁇ h ⁇ t antenna 20.
• FIG. 4 is a pictorial diagram illustrating a second drive configuration 40 of a spiral sheet antenna for producing a rectangular cylinder-like current distribution.
• the antenna might have a high electrical conductivity, e.g. copper depending on the
• FIGS. 3 and 4 illustrate two sample drive configurations applied to the spiral
• antenna 20 produces an AC magnetic field that radiates efficiently in a structure that is
• the antenna being described here can be regarded as a rectangular metallic enclosure with two openings, (at the ends of the rectangle), and a seam connecting the
• the seam functions as a capacitor and can be implemented in several different ways.
• a seam can be constructed with a slot under which
• FIG. 5 is a pictorial diagram 50 illustrating a first embodiment of a rectangular
• the seam 54 comprises of a slot over a double parallel plate.
• the third plate 53 is far from the first and second plates 51 and 52, and therefore contributes little to the capacitance.
• the rectangular cylindrical cu ⁇ ent distribution structure 50 thus yields the benefit of a
• the capacitance is diminished by a factor 4 due to the two capacitors in series from the overlap of the first and second plates 51 and 52,compared to the same two plates in parallel.
• FIG. 6 is a pictorial diagram 60, a perspective view illustrating the second
• a first hole 61 is positioned in the front of the pictorial diagram 60, while a second hole
• sheet antenna may be driven in a number of different ways.
• a possible approach is to
• FIG. 7A is a pictorial diagram 70 illustrating this, the second type of drive configuration (of the third seam example, illustrated in FIG. 6) for the rectangular
• a co-axial feed cable 74 extends and connects through a
• third plate 73 a third plate 73, a second plate 72, and a first plate 71, to an off-center drive wire 75.
• FIG. 7B is a pictorial diagram 76 illustrating a side view of this second type of drive
• a drive wire 77 is shown in cross-section in FIG. 7B.
• FIG. 8 is a pictorial diagram 80 illustrating a third embodiment of a
• the pictorial diagram 80 will not operate at as low a
• FIG. 9A is a pictorial diagram illustrating a perspective view, and FIG. 9B illustrating a side view, of a first embodiment of a shielded spiral sheet antenna 90 for
• the shielded spiral sheet antenna 90 therefore faces
• the width of the border w and w' determines the degree
• FIGS. 10A and 10B are pictorial diagrams illustrating side views of a operational mathematical technique for defining a shielded spiral sheet antenna.
• the shielded spiral sheet antenna 100 two center points are chosen, a
• a path 103, L s represents the shortest path between the
• a path 104, L e represents the longest path between the geometrical center point of a top opening 101 and the geometrical center
• the path 103 is shorter than the
• a value of ⁇ « 1 provides some good degree of
• FIG. 11 is a pictorial diagram 110 illustrating an operational procedure for
• bottom openings can be defined as a type of geometrical "center-of-gravity":
• R is the set of position vectors at the edges of the opening
• Ro is the set of position vectors at the edges of the opening
• FIGS. 9A, 9B, 10A, and 10B are useful for shielding cell phone antennas from the user.
• FIG. 12A is a pictorial diagram 120 illustrating a perspective view of a second embodiment of a shielded spiral sheet antenna (with overlapping capacitive structure).
• a first hole 124 and a second hole 125 are positioned to face away from the user.
• both the first and second holes 124 and 125 are facing the front.
• FIG. 12B is a pictorial diagram 127 illustrating a side cross-sectional view of
• FIG. 12A with AC magnetic field illustrated.
• the structure diagram has two holes
• the rectangular openings shown may be smaller than the width of the rectangle.
• a rectangular container is intended as an illustration.
• the rectangular container may be in a shape
• FIG. 13 is a pictorial diagram illustrating a dual frequency, dual-tap antenna
• PCS Personal Communication System
• GPS Global Positioning Systems
• the multi-taps would be derived from a single
• the antenna structure consists of a metallic enclosure, with holes, or openings. For each independent antenna, or for each frequency band, an additional
• n-frequencies might be
• FIG. 14 is a pictorial diagram 140 illustrating the placement of one or more
• the internal volume in an antenna can be wisely utilized as not to waste any unused empty space. The extra
• the space can be filled with one or more active circuit boards 143 for operation of a cell phone.
• the internal circuit boards do not interfere much with the internal AC RF

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Details Of Aerials (AREA)
• Aerials With Secondary Devices (AREA)
• Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Applications Claiming Priority (9)

Publications (3)

Family

ID=27505755

Family Applications (1)

Country Status (5)

Families Citing this family (9)

Citations (2)

Family Cites Families (3)

• 2002
  • 2002-02-11 WO PCT/US2002/004228 patent/WO2002065583A1/fr not_active Application Discontinuation
  • 2002-02-11 KR KR1020087014585A patent/KR20080064907A/ko not_active Application Discontinuation
  • 2002-02-11 EP EP02724937A patent/EP1371111B1/fr not_active Expired - Lifetime
  • 2002-02-11 AT AT02724937T patent/ATE412259T1/de not_active IP Right Cessation
  • 2002-02-11 KR KR1020087031485A patent/KR20090016491A/ko not_active Application Discontinuation
  • 2002-02-11 KR KR1020037010598A patent/KR100945124B1/ko active IP Right Grant
  • 2002-02-11 KR KR1020107004863A patent/KR20100037168A/ko not_active Application Discontinuation
  • 2002-02-11 DE DE60229503T patent/DE60229503D1/de not_active Expired - Fee Related

Patent Citations (2)

Non-Patent Citations (1)

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