EP1753084B1 - Antenne à fentes ferroélectrique - Google Patents

Antenne à fentes ferroélectrique Download PDF

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Publication number
EP1753084B1
EP1753084B1 EP06123190A EP06123190A EP1753084B1 EP 1753084 B1 EP1753084 B1 EP 1753084B1 EP 06123190 A EP06123190 A EP 06123190A EP 06123190 A EP06123190 A EP 06123190A EP 1753084 B1 EP1753084 B1 EP 1753084B1
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European Patent Office
Prior art keywords
dielectric
dielectric constant
antenna
fixed
radiator
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EP06123190A
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German (de)
English (en)
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EP1753084A2 (fr
EP1753084A3 (fr
Inventor
Stanley Slavko Toncich
Allen Tran
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Kyocera Corp
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Kyocera Corp
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Priority claimed from US09/904,631 external-priority patent/US6690251B2/en
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority claimed from EP02718438A external-priority patent/EP1384285B1/fr
Publication of EP1753084A2 publication Critical patent/EP1753084A2/fr
Publication of EP1753084A3 publication Critical patent/EP1753084A3/fr
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    • 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
    • H01Q13/10—Resonant slot 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
    • H01Q13/106—Microstrip slot antennas

Definitions

  • This invention generally relates to wireless communication antennas and, more particularly, to a system and method for tuning an antenna with the aid of a ferroelectric dielectric material.
  • Ferroelectric materials have a dielectric constant that changes in response to an applied voltage. Because of their variable dielectric constant, ferroelectric materials are good candidates for making tunable components. Under presently used measurement and characterization techniques, however, tunable ferroelectric components have gained the reputation of being consistently and substantially lossy, regardless of the processing, doping or other fabrication techniques used to improve their loss properties. They have therefore not been widely used. Ferroelectric tunable components operating in RF or microwave regions are perceived as being particularly lossy. This observation is supported by experience in Radar applications where, for example, high radio frequency (RF) or microwave loss is the conventional rule for bulk (thickness greater than about 1.0 mm) FE (ferroelectric) materials especially when maximum tuning is desired.
  • RF radio frequency
  • microwave loss is the conventional rule for bulk (thickness greater than about 1.0 mm) FE (ferroelectric) materials especially when maximum tuning is desired.
  • steps include, but are not limited to: (1) pre and post deposition annealing or both to compensate for 02 vacancies, (2) use of buffer layers to reduce surfaces stresses, (3) alloying or buffering with other materials and (4) selective doping.
  • ferroelectric materials As demand for limited range tuning of lower power components has increased in recent years, the interest in ferroelectric materials has turned to the use of thin film rather than bulk materials. The assumption of high ferroelectric loss, however, has carried over into thin film work as well. Conventional broadband measurement techniques have bolstered the assumption that tunable ferroelectric components, whether bulk or thin film, have substantial loss. In wireless communications, for example, a Q of greater than 80, and preferably greater than 180 and, more preferably, greater than 350, is necessary at frequencies of about 2 GHz. These same assumptions apply to the design of antennas.
  • Tunable ferroelectric components can be employed in a wide variety of frequency agile circuits. Tunable components are desirable because they can provide smaller component size and height, lower insertion loss or better rejection for the same insertion loss, lower cost and the ability to tune over more than one frequency band. The ability of a tunable component that can cover multiple bands potentially reduces the number of necessary components, such as switches that would be necessary to select between discrete bands were multiple fixed frequency components used. These advantages are particularly important in wireless handset design, where the need for increased functionality and lower cost and size are seemingly contradictory requirements. With code division multiple access (CDMA) handsets, for example, performance of individual components is highly stressed.
  • CDMA code division multiple access
  • ferroelectric materials for the purpose of frequency tuning antennas.
  • FE dielectric materials has not always been effective, especially if the FE materials are not located in the regions of greatest electromagnetic field densities.
  • the region of greatest electromagnetic fields is between the radiator and the counterpoise (ground).
  • the changes in dielectric constant have a minimal effect on changes in the resonant frequency of the antenna.
  • these conventional FE dielectric antennas have had to rely on multiple radiators.
  • US 5,617,104 discloses a high Tc superconducting tunable ferroelectric transmitting system containing an oscillator and a tunable antenna, ferroelectric resonator whose permittivity is a function of a bias field applied across it and a tuning frequency, a Curie temperature, dielectric material, input, output, and an operating frequency and comprising a tunable ferroelectric resonator (TFR), a tunable ferroelectric resonator (TFR) antenna, and means for keeping the ferroelectric transmitting system at a high Tc superconducting temperature slightly above said Curie temperature to avoid hysterisis and to obtain a maximum change of permittivity.
  • TFR tunable ferroelectric resonator
  • TFR tunable ferroelectric resonator
  • US 5,583,524 discloses a scanning antenna array comprising line source means and an array of continuous transverse stubs coupled to the line source means that is comprised of: a planar sheet of substantially homogeneous dielectric material, a conductive material disposed on the broad surfaces of the sheet of dielectric material, and a voltage source.
  • WO 00/79645 discloses an aerial having at least one plane spiral arm being provided in front of and parallel with a plane face of a reflecting member, comprising a ferro-electric member being provided between the spiral arm and the reflecting member, whereby the aerial is being adapted for receiving an adjustable bias voltage over the at least one arm and the reflecting member for varying the dielectric constant of, and thereby the delay through, the ferroelectric member (2).
  • DE 1 230 468 discloses a wave guide slot antenna.
  • a slot antenna a claimed in claim 1 is provided.
  • the subclaims shows some examples for such an antenna.
  • the present invention describes antennas fabricated with FE materials as a dielectric.
  • the dielectric constant of the FE material can be controlled by an applied voltage. Because there is a fixed relationship between dielectric constant and resonant frequency, the resonant frequency of the antenna can be controlled using the applied voltage.
  • Modifying the resonant frequency includes forming an antenna with a variable operating frequency responsive to the applied voltage.
  • forming an antenna with a variable operating frequency includes forming an antenna with a predetermined fixed characteristic impedance, independent of the resonant frequency.
  • each antenna includes a radiator and a dielectric with ferroelectric material proximate to the radiator having a variable dielectric constant.
  • the radiator is resonant at a frequency responsive to the dielectric constant of the ferroelectric material.
  • Some antennas include a counterpoise to the radiator.
  • Other antenna designs include a counterpoise and radiator that are arbitrarily designated.
  • Yet other designs include a counterpoise and radiator that are not distinctly distinguishable from each other.
  • the family of antennas presented below have an FE dielectric layer included to effectively tune the resonant frequency of a single-radiator antenna, unlike prior art antennas which rely upon multiple radiators to achieve any appreciable bandwidth or resonant frequency change.
  • the present invention single-radiator antennas are defined herein as single-band, in that they each have one fundament frequency (excluding the consideration of harmonics of the fundamental) of resonance corresponding to the single radiator.
  • the FE dielectric is located in the regions of densest electromagnetic fields between the radiator and counterpoise (or virtual counterpoise). As a result, changes in the dielectric constant of the FE material produce significant changes in the resonant frequency of the antenna.
  • Figs. 1a through 1c are views of an exemplary patch antenna with a selectable operating frequency.
  • Fig. 1a is a perspective view of a single-band patch antenna that may have half-wavelength radiator dimensions.
  • the patch antenna 100 comprises a counterpoise 102 and a dielectric with ferroelectric material 104 overlying the counterpoise.
  • the dielectric has a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • At least one radiator 106 overlies the dielectric 104 having a resonant frequency responsive to the dielectric constant.
  • the dielectric 104 is a layer consisting entirely of FE material.
  • a coaxial feedline 108 has a center conductor 110 connected to the radiator 106 and a ground connected to the counterpoise 102.
  • Fig. 1b is a plan view of the patch antenna 100 of Fig. 1a .
  • the dielectric with FE material is only placed in the vicinity of the radiator 106.
  • Area 112 may be a dielectric with a fixed constant.
  • the FE dielectric 104 may surround the radiator 106 evenly on all sides, or the dielectric areas 104 and 112 may be formed symmetrically around the radiator 106.
  • Fig. 1c is a cross-sectional view of an inverted-F planar antenna, such as might be suitable with quarter-wavelength radiator dimensions.
  • the FE dielectric 104 is shown interposed between the single-radiator 106 and the counterpoise 102, however, other FE dielectric patterns and distributions are also practical.
  • the antenna 100 has a predetermined fixed characteristic impedance independent of the resonant frequency. That is, the input impedance remains 50 ohms for example, despite the operating frequency selected. Alternately, it can be said that the antenna 100 has a predetermined approximately constant gain independent of the resonant frequency.
  • Fig. 2 is a cross-sectional drawing illustrating an alternate aspect of the patch antenna of Fig. 1a .
  • the dielectric 104 includes at least one dielectric layer 200 formed from a first material with a fixed dielectric constant and a dielectric 202 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 200 with the fixed dielectric constant.
  • the dielectric with the FE material 202 overlies the dielectric with the fixed dielectric constant 200.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 202 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied by voltage generator 203.
  • an electrical insulator (not shown) can be interposed between layer 202 and the conductive radiator 106 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 202 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator, and the reference ground is supplied to the counterpoise 102.
  • the dielectric formed with the fixed dielectric constant 200 overlies the dielectric with the ferroelectric material 202.
  • an insulator might be interposed between the FE dielectric layer 202 and the conductive counterpoise, and a reference ground supplied that is different from the voltage at the counterpoise.
  • the FE dielectric layer is typically biased with a reference ground supplied to the counterpoise. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarity shown.
  • Fig. 3 is a cross-sectional drawing illustrating an alternate aspect of the patch antenna of Fig. 1a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 200a underlying the dielectric with the fixed dielectric constant 202, and a second layer 200b overlies the dielectric with the ferroelectric material 202.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant. Further, the use of three or more layers of fixed dielectric is also possible.
  • multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 4 is a cross-sectional drawing illustrating an alternate aspect of the patch antenna of Fig. 1a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 202 is formed internal to the dielectric 200 with the fixed dielectric constant.
  • the dielectric with the fixed dielectric constant 200 is formed internal to the FE dielectric 202.
  • multiple internal FE dielectric regions could be used.
  • the dielectric with ferroelectric material 202 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 202 can be formed in a thin film layer having a thickness 206 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 202 is formed in a thick film having a thickness 206 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant 200 and the dielectric formed from the ferroelectric material 202 have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • each single-band slot antenna includes a counterpoise and a dielectric with ferroelectric material overlying the counterpoise.
  • some slots antennas can be understood as just having a radiator, or having a virtual radiator and virtual counterpoise.
  • a slot, formed in either the counterpoise or the radiator has an electrical length responsive to the dielectric constant and the dielectric has a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • a radiator overlies and is proximate to the dielectric.
  • the radiator in each of the slot designs has a predetermined fixed characteristic impedance independent of the resonant frequency. That is, the electrical length of the slot(s) is constant with respect to the resonant frequency. Alternately, the radiator has a predetermined approximately constant gain independent of the resonant frequency. It is also generally true that the slot (or slots) have an electrical length that varies in response to the dielectric constant(s) to be either approximately one-half wavelength of the resonant frequency with respect to the dielectric, or approximately one-quarter wavelength of the resonant frequency with respect to the dielectric.
  • the principles and design of slot antennas are well understood by those skilled in the art and are not repeated here in the interest of brevity. Although the use of FE material gives a slot antenna a wider range of selectable operating frequencies, the general principles of design are not changed by the present invention FE material.
  • Fig. 5a is a perspective view of a microstrip slot antenna 500.
  • a counterpoise 502, a radiator 504, and a dielectric with ferroelectric material 506 form the microstrip.
  • the dielectric with ferroelectric material 506 is located in the vicinity of the slot, as shown.
  • Away from the slot a different dielectric 507 may be used with a fixed dielectric constant.
  • a slot 508 is formed in the counterpoise 502. As shown, the slot 508 is transverse to the radiator 504, but it need not be.
  • a plurality of slots are used.
  • Fig. 5b is a cross-sectional drawing illustrating an alternate aspect of the microstrip slot antenna of Fig. 5a .
  • the dielectric 506 includes at least one dielectric layer 510 formed from a first material with a fixed dielectric constant and a dielectric 512 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 510 with the fixed dielectric constant.
  • the dielectric with the FE material 512 overlies the dielectric with the fixed dielectric constant 510.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 512 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 512 and the conductive radiator 504 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 512 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator, and the reference ground is supplied to the counterpoise 502.
  • the dielectric formed with the fixed dielectric constant 510 overlies the dielectric with the ferroelectric material 512.
  • an insulator might be interposed between the FE dielectric layer 512 and the conductive counterpoise, and a reference ground supplied that is different from the voltage at the counterpoise.
  • the FE dielectric layer is typically biased with a reference ground supplied to the counterpoise. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarities shown.
  • Fig. 5c is a cross-sectional drawing illustrating an alternate aspect of the microstrip slot antenna of Fig. 5a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 510a underlying the dielectric with the fixed dielectric constant 512, and a second layer 510b overlies the dielectric with the ferroelectric material 512.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 5d is a cross-sectional drawing illustrating an alternate aspect of the microstrip slot antenna of Fig. 5a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 512 is formed internal to the dielectric 510 with the fixed dielectric constant.
  • multiple FE internal regions can be formed.
  • the dielectric with the fixed dielectric constant 510 is formed internal to the FE dielectric 512.
  • additional electrical insulators might be used to isolate from the counterpoise 502 and radiator 504 from the FE layer 512.
  • the dielectric with ferroelectric material 512 is formed from barium strontium titanate, Ba x Sr l-x TiO 3 (BSTO).
  • BSTO barium strontium titanate
  • alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 512 can be formed in a thin film layer having a thickness 514 in the range from 0.15 to 2 microns.
  • the dielectric with ferroelectric material 512 is formed in a thick film having a thickness 514 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts.
  • the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Fig. 6a is a perspective view of a coaxial slot antenna 600 which is not part of the invention.
  • the counterpoise 602, radiator 604, and dielectric with FE material 606 form a coaxial line with a slot 608 in the counterpoise 602.
  • the FE dielectric 606 is proximate to the slot 608. Away from the slot a different dielectric 607 with a fixed dielectric constant can be used. As shown, the slot 608 is transverse to the radiator 604, but it need not be.
  • a plurality of slots are used.
  • Fig. 6b is a cross-sectional drawing illustrating a coaxial slot antenna according to the invention.
  • the dielectric 606 includes at least one dielectric layer 610 formed from a first material with a fixed dielectric constant and a dielectric 612 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 610 with the fixed dielectric constant.
  • the dielectric with the FE material 612 overlies the dielectric with the fixed dielectric constant 610.
  • a voltage is applied to a conductor in the vicinity of the. FE dielectric layer 612 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 612 and the conductive radiator 604 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 612 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator, and the reference ground is supplied to the counterpoise 602.
  • the dielectric formed with the fixed dielectric constant 610 overlies the dielectric with the ferroelectric material 612.
  • an insulator might be interposed between the FE dielectric layer 612 and the conductive counterpoise, and a reference ground supplied that is different from the voltage at the counterpoise.
  • the FE dielectric layer is typically biased with a reference ground supplied to the counterpoise. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarities shown.
  • Fig. 6c is a cross-sectional drawing illustrating an alternate aspect of the coaxial slot antenna of Fig. 6a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 610a underlying the dielectric with the ferroelectric material 612, and a second layer 610b overlies the dielectric with the ferroelectric material 612.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 6d is a cross-sectional drawing illustrating an alternate aspect of the coaxial slot antenna of Fig. 6a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 612 is formed internal to the dielectric 610 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 610 is formed internal to the FE dielectric 612. Again, additional electrical insulators might be used to isolate from the counterpoise 602 and radiator 604 from the FE layer 612.
  • the dielectric with ferroelectric material 612 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO).
  • BSTO barium strontium titanate
  • alternate FE materials are well known and may perform equivalently- Returning the Fig. 6b for example, the dielectric with ferroelectric material 612 can be formed in a thin film layer having a thickness 614 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 612 is formed in a thick film having a thickness 614 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts.
  • the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Figs. 7a through 7f are exemplary views of circular waveguide slot antenna 700 which is not part of the invention.
  • the circular waveguide antenna is described as comprising a radiator 704 and dielectric 706.
  • the slot 708 is transverse to the radiator 704, but it need not be.
  • the FE dielectric 706 is located proximate to the slot 708.
  • Other, fixed constant dielectric material 707 can be used away from the slot 708.
  • a plurality of slots are used.
  • Fig. 7b is a cross-sectional drawing illustrating an alternate aspect of the circular waveguide slot antenna of Fig. 7a .
  • the dielectric 706 includes at least one dielectric layer 710 formed from a first material with a fixed dielectric constant and a dielectric 712 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 710 with the fixed dielectric constant.
  • the dielectric with the FE material 712 overlies the dielectric with the fixed dielectric constant 710.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 712 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 712 and the conductive radiator 704 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 712 that interferes with the antenna tuning. Therefore, slits 709 can be formed in the radiator 704 to separate the two bias voltage polarities.
  • the dc voltages are typically superimposed upon ac signal being conducted by the radiator halves.
  • the dielectric formed with the fixed dielectric constant 710 overlies the dielectric with the ferroelectric material 712. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarities shown.
  • Fig. 7c is a cross-sectional drawing illustrating an alternate aspect of the circular waveguide slot antenna of Fig. 7a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 710a underlying the dielectric with the fixed dielectric constant 712, and a second layer 710b overlies the dielectric with the ferroelectric material 712.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 7d is a cross-sectional drawing illustrating an alternate aspect of the circular waveguide slot antenna of Fig. 7a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 712 is formed internal to the dielectric 710 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 710 is formed internal to the FE dielectric 712. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • Figs. 7e and 7f are alternate aspects of the circular waveguide slot antenna 700.
  • the slits are not necessary because the radiator 704 need not carry a bias voltage. Instead the bias voltage is supplied by panels 714 and 716.
  • the bias panels 714/716 can be placed in a variety of positions on either side of the FE dielectric. One panel may even be located in the slot.
  • the dielectric with ferroelectric material 712 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 712 can be formed in a thin film layer having a thickness 714 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 712 is formed in a thick film having a thickness 714 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Fig. 8a is a perspective view of an exemplary rectangular waveguide slot antenna 800 which is not part of the invention.
  • the rectangular waveguide antenna is described as comprising a radiator 804 and dielectric 806. However, the designations of radiator and counterpoise are arbitrary.
  • the slot 808 is transverse to the radiator 804, but it need not be.
  • the FE dielectric 806 is located proximate to the slot 808. Away from the slot 808, a fixed constant dielectric 807 may be used.
  • a plurality of slots are used.
  • Fig. 8b is a cross-sectional drawing illustrating an alternate aspect of the rectangular waveguide slot antenna of Fig. 8a .
  • the dielectric 806 includes at least one dielectric layer 810 formed from a first material with a fixed dielectric constant and a dielectric 812 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 810 with the fixed dielectric constant.
  • the dielectric with the FE material 812 overlies the dielectric with the fixed dielectric constant 810.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 812 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 812 and the conductive radiator 804 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 812 that interferes with the antenna tuning. Therefore, (electrically isolating) slits 809 can be formed in the radiator 804 to separate the two bias voltage polarities. The dc voltages are typically superimposed upon ac signal being conducted by the radiator halves.
  • the dielectric formed with the fixed dielectric constant 810 overlies the dielectric with the ferroelectric material 812. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarities shown.
  • Fig. 8c is a cross-sectional drawing illustrating an alternate aspect of the rectangular waveguide slot antenna of Fig. 8a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 810a underlying the dielectric with the fixed dielectric constant 812, and a second layer 810b overlies the dielectric with the ferroelectric material 812.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 8d is a cross-sectional drawing illustrating an alternate aspect of the rectangular waveguide slot antenna of Fig. 8a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 812 is formed internal to the dielectric 810 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 810 is formed internal to the FE dielectric 812. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • the dc bias voltage is supplied by panels interior to the radiator 804, so that the slits 809 need not be formed.
  • the dielectric with ferroelectric material 812 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 812 can be formed in a thin film layer having a thickness 814 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 812 is formed in a thick film having a thickness 814 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides, However, other equivalent elements in the same column of the periodic table may also be practical.
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Figs. 9a and 9b are partial cross-sectional and plan views, respectively, of an exemplary flare-notch antenna which is not part of the invention.
  • the flare-notch antenna 900 comprises a counterpoise 902, a radiator 904, and a dielectric 906a and 906a, at least one of which including FE material.
  • the designation of counterpoise and radiator may be considered arbitrary.
  • a slot or notch 907 is shown.
  • the FE dielectric 906a and 906b are proximately located to the notch 907. Also shown is a feed with a center conductor 908 and a ground 909.
  • Fig. 9c is an alternate aspect of the flare-notch antenna of Fig. 9b .
  • the dielectric 906a and 906b includes at least one dielectric layer 910 formed from a first material with a fixed dielectric constant and a dielectric 912 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 910 with the fixed dielectric constant.
  • the dielectric with the FE material 912 overlies the dielectric with the fixed dielectric constant 910.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 912 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 912 and the radiator/counterpoise 904/902 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 912 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator/counterpoise 904/902, and the reference ground is supplied to conductive panels 914.
  • the dielectric formed with the fixed dielectric constant 910 overlies the dielectric with the ferroelectric material 912. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarity shown.
  • Fig. 9d is a plan view illustrating an alternate aspect of the flare-notch antenna of Fig. 9b with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 910a underlying the dielectric with the fixed dielectric constant 912, and a second layer 910b overlies the dielectric with the ferroelectric material 912.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used. The multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 9e is a plan view illustrating an alternate aspect of the flare-notch antenna of Fig. 9b with an internal layer of FE material.
  • the dielectric with the ferroelectric material 912 is formed internal to the dielectric 910 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 910 is formed internal to the FE dielectric 912. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical. In another variation not shown, the FE material forms internal regions on only one side of the radiator, for example is dielectric 906a.
  • the dielectric with ferroelectric material 912 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 912 can be formed in a thin film layer having a thickness 914 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 912 is formed in a thick film having a thickness 914 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Figs. 10a though 10d are illustrations of an exemplary open-ended waveguide antenna 1000 which is not part of the invention.
  • Fig. 10a is a partial cross-sectional view of the present invention open-ended waveguide antenna with a selectable operating frequency.
  • the open-ended waveguide antenna 1000 comprises a radiator 1002 and a dielectric 1006 with ferroelectric material proximately located to the radiator 1002.
  • the dielectric 1006 has a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • the designations of counterpoise and radiator are arbitrary.
  • the open ends 1007 are grounded. Away from the open ends 107 a constant dielectric material 1005 can be used.
  • open-ended antennas are well understood by those skilled in the art and are not repeated here in the interest of brevity. Although the use of FE material gives an open-ended antenna a wider range of selectable operating frequencies, the general principles of design are not changed by the present invention FE material.
  • the antenna 1000 has a predetermined fixed characteristic impedance independent of the resonant frequency. Alternately stated, the antenna 1000 has a predetermined approximately constant gain independent of the resonant frequency.
  • Fig. 10b is a cross-sectional drawing illustrating an alternate aspect of the open-ended waveguide antenna of Fig. 10a .
  • the dielectric 1006 includes at least one dielectric layer 1010 formed from a first material with a fixed dielectric constant and a dielectric 1012 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 1010 with the fixed dielectric constant.
  • the dielectric with the FE material 1012 overlies the dielectric with the fixed dielectric constant 1010.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 1012 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 1012 and the radiator 1002 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 1012 that interferes with the antenna tuning. Therefore, electrically isolating slits 1009 can be formed in the radiator 1002 to separate the two bias voltage polarities.
  • the dc voltages are typically superimposed upon ac signal being conducted by the radiator halves.
  • the dielectric formed with the fixed dielectric constant 1010 overlies the dielectric with the ferroelectric material 1012. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarity shown.
  • Fig. 10c is a cross-sectional drawing illustrating an alternate aspect of the open-ended waveguide antenna of Fig. 10a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 1010a underlying the dielectric with the fixed dielectric constant 1012, and a second layer 1010b overlies the dielectric with the ferroelectric material 1012.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 10d is a cross-sectional drawing illustrating an alternate aspect of the open-ended waveguide antenna of Fig. 10a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 1012 is formed internal to the dielectric 1010 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 1010 is formed internal to the FE dielectric 1012. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • the dc bias voltage is supplied by panels interior to the radiator 1002, so that the slits 1009 need not be formed.
  • the dielectric with ferroelectric material 1012 is formed from barium strontium titanate, Ba x Sr l-x TiO 3 (BSTO).
  • BSTO barium strontium titanate
  • alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 1012 is formed in a thin film layer having a thickness 1014 in the range from 0.15 to 2 microns.
  • the dielectric with ferroelectric material 1012 is formed in a thick film having a thickness 1014 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts.
  • the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • open-ended rectangular waveguide has been depicted, the above analysis and description applies to open-ended circular waveguide and open-ended parallel plate antennas. Further, the open-ended waveguide antenna 1000 can have a signal feed elected that is a coaxial cable, parallel plates, or any kind of waveguide.
  • Figs. 11a through 11e are views of an exemplary horn antenna with a selectable operating frequency which is not part of the invention.
  • the horn antenna 1100 comprises a radiator horn 1102 and a dielectric 1106 with ferroelectric material proximately located to the radiator horn.
  • the dielectric 1006 has a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • a coaxial feed line 1004 with a center conductor 1005 is shown.
  • the horn 1002 has an electrical length 1109 responsive to the dielectric constant. The electrical length is constant with respect to the resonant frequency.
  • the horn can be either grounded or open. Again the designations of counterpoise and radiator are arbitrary.
  • horn antennas are well understood by those skilled in the art and are not repeated here in the interest of brevity. Although the use of FE material gives a horn antenna a wider range of selectable operating frequencies, the general principles of design are not changed by the present invention FE material.
  • the horn antenna 1100 has a predetermined fixed characteristic impedance independent of the resonant frequency. Alternately, the horn antenna 1100 has a predetermined approximately constant gain independent of the resonant frequency.
  • Fig. 11b is a cross-sectional drawing illustrating an alternate aspect of the horn antenna of Fig. 11a .
  • the dielectric 1106 includes at least one dielectric layer 1110 formed from a first material with a fixed dielectric constant and a dielectric 1112 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 1110 with the fixed dielectric constant.
  • the dielectric with the FE material 1112 overlies the dielectric with the fixed dielectric constant 1110.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 1112 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 1112 and the radiator horn 1102 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 1112 that interferes with the antenna tuning. Therefore, electrically isolating slits 1108 can be formed in the radiator 1102 to separate the two bias voltage polarities.
  • the dc voltages are typically superimposed upon ac signal being conducted by the radiator halves.
  • the dielectric formed with the fixed dielectric constant 1110 overlies the dielectric with the ferroelectric material 1112. Note, in some aspects of the antenna the bias voltage polarities are reversed from the polarities shown.
  • Fig. 11c and 11d are cross-sectional drawings illustrating an alternate aspect of the horn antenna 1100 of Fig. 11a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 1110a underlying the dielectric with the fixed dielectric constant 1112, and a second layer 1110b overlies the dielectric with the ferroelectric material 1112.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used.
  • the multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 11e is a cross-sectional drawing illustrating an alternate aspect of the horn antenna of Fig. 11a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 1112 is formed internal to the dielectric 1110 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 1110 is formed internal to the FE dielectric 1112. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • the dc bias voltage is supplied by panels interior to the radiator 1002, so that the slits 1108 need not be formed.
  • the dielectric with ferroelectric material 1112 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 1112 can be formed in a thin film layer having a thickness 1114 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 1112 is formed in a thick film having a thickness 1114 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • horn antennas applies equally to rectangular waveguide, circular waveguide, and parallel plate horn antennas using a signal feed from a coaxial cable, circular waveguide, rectangular waveguide, or a parallel plate signal feed.
  • Figs. 12a through 12f are depictions of an exemplary monopole antenna with a selectable operating frequency which is not part of the invention.
  • the monopole antenna 1200 comprises a radiator 1202, a counterpoise 1204, and a dielectric 1206 at least partially surrounding the radiator 1202.
  • the dielectric includes ferroelectric material having a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • the radiator 1202 has an electrical length 1208 responsive to the dielectric constant. Alternately but not shown, the radiator 1202 can be formed in a helical shape.
  • the principles and design of monopole antennas are well understood by those skilled in the art and are not repeated here in the interest of brevity. Although the use of FE material gives a monopole antenna a wider range of selectable operating frequencies, the general principles of design are not changed by the present invention FE material.
  • the antenna 1200 has a predetermined fixed characteristic impedance independent of the resonant frequency. That is, the electrical length of the radiator is constant with respect to the resonant frequency. Alternately, the antenna 1200 has a predetermined approximately constant gain independent of the resonant frequency.
  • Fig. 12b is a drawing illustrating an alternate aspect of the monopole antenna of Fig. 12a .
  • the dielectric 1206 includes at least one dielectric layer 1210 formed from a first material with a fixed dielectric constant and a dielectric 1212 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 1210 with the fixed dielectric constant.
  • the dielectric with the FE material 1212 overlies the dielectric with the fixed dielectric constant 1210.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 1212 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 1212 and the radiator 1202 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 1212 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator 1202, and the reference ground is supplied to conductive panels 1214. Note, in some aspects of the antenna the bias voltage polarities are reversed. In other aspects, the radiator 1202 does not carry a de bias, the two bias polarities are carried instead by panels 1214.
  • Fig. 12c is a drawing illustrating an alternate aspect of the monopole antenna 1200 of Fig. 12a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 1210a underlying the dielectric with the fixed dielectric constant 1212, and a second layer 1210b overlies the dielectric with the ferroelectric material 1212.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used. The multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 12d is a drawing illustrating an alternate aspect of the monopole antenna of Fig. 12a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 1212 is formed internal to the dielectric 1210 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 1210 is formed internal to the FE dielectric 1212. It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • Fig. 12e and 12f illustrate some alternate aspects of the present invention monopole antenna.
  • the dielectric with ferroelectric material 1212 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 1212 can be formed in a thin film layer having a thickness 1214 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 1212 is formed in a thick film having a thickness 1214 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides.
  • W tungsten
  • Mn manganese
  • Mg magnesium
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Figs. 13a through 13f are drawings of an exemplary dipole antenna with a selectable operating frequency which is not part of the invention.
  • the dipole antenna 1300 comprises a radiator 1302, a counterpoise 1304, and a dielectric 1306 at least partially surrounding the radiator 1302.
  • the dielectric 1306 includes ferroelectric material having a varying dielectric constant responsive to a voltage applied to the ferroelectric material.
  • the radiator and counterpoise have electrical lengths 1308 that are responsive to the varying dielectric constant.
  • the radiator 1302, the counterpoise 1304, or both can be formed in a helical shape.
  • dipole antennas are well understood by those skilled in the art and are not repeated here in the interest of brevity. Although the use of FE material gives a dipole antenna a wider range of selectable operating frequencies, the general principles of design are not changed by the present invention FE material.
  • the antenna 1300 has a predetermined fixed characteristic impedance independent of the resonant frequency. That is, the radiator and counterpoise electrical lengths remain constant with respect to resonant frequency. Typically, the electrical length of the radiator 1302 and counterpoise 1304 are either one-half or one-quarter the wavelength of the resonant frequency with respect to the dielectric. Alternately, the antenna has a predetermined approximately constant gain independent of the resonant frequency.
  • Fig. 13b is a drawing illustrating an alternate aspect of the monopole antenna of Fig. 13a .
  • the dielectric 1306 includes at least one dielectric layer 1310 formed from a first material with a fixed dielectric constant and a dielectric 1312 formed from a ferroelectric material with a variable dielectric constant, adjacent the dielectric 1310 with the fixed dielectric constant.
  • the dielectric with the FE material 1312 overlies the dielectric with the fixed dielectric constant 1310.
  • a voltage is applied to a conductor in the vicinity of the FE dielectric layer 1312 to create a desired dielectric constant.
  • the voltage represented by the "+" and "-" signs can be supplied.
  • an electrical insulator (not shown) can be interposed between layer 1312 and the radiator 1302 to isolate the bias voltage from the ac signal voltage.
  • a sheet of conductor is usually required to evenly distribute the bias voltage over the FE dielectric 1312 that interferes with the antenna tuning. Therefore, the dc voltage is typically superimposed upon ac signal being conducted by the radiator 1302, and the reference ground is supplied to conductive panels 1314. Note, in some aspects of the antenna the bias voltage polarities are reversed. In other aspects, the radiator 1302 does not carry a dc bias, the two bias polarities are carried instead by panels 1314.
  • Fig. 13c is a drawing illustrating an alternate aspect of the monopole antenna 1300 of Fig. 13a with multiple fixed dielectric constant layers.
  • the dielectric with the fixed dielectric forms a first layer 1310a underlying the dielectric with the fixed dielectric constant 1312, and a second layer 1310b overlies the dielectric with the ferroelectric material 1312.
  • the two fixed dielectric layers need not necessarily have the same dielectric constant or thickness. Further, three or more fixed dielectric layers may be used. Alternately but not shown, multiple FE layers can be formed around a fixed dielectric layer, or multiple layers of both fixed dielectric and FE layers can be used. The multiple FE dielectric layers may have different thickness, be made of different FE materials, or otherwise have different dielectric constants with respect to the same voltage.
  • Fig. 13d is a drawing illustrating an alternate aspect of the monopole antenna of Fig. 13a with an internal layer of FE material.
  • the dielectric with the ferroelectric material 1312 is formed internal to the dielectric 1310 with the fixed dielectric constant. Note, multiple internal regions can be formed although only one is shown. Alternately but not shown, the dielectric with the fixed dielectric constant 1310 is formed internal to the FE dielectric 1312, It should also be noted that although the internal region is shown as rectangularly shaped, other shapes such as circular, cylindrical, and oval shapes are equally practical.
  • Fig. 13e and 13f illustrate some alternate aspects of the present invention monopole antenna.
  • the dielectric with ferroelectric material 1212 is formed from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO). However, alternate FE materials are well known and may perform equivalently.
  • the dielectric with ferroelectric material 1212 can be formed in a thin film layer having a thickness 1214 in the range from 0.15 to 2 microns. Alternately, the dielectric with ferroelectric material 1212 is formed in a thick film having a thickness 1214 in the range from 1.5 to 1000 microns.
  • the dielectric with ferroelectric material has a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, the dielectric formed from the first material with a fixed dielectric constant and the dielectric formed from the ferroelectric material have a composite dielectric constant in the range between 2 and 100 at zero volts.
  • the dielectric constant of the FE material can be manipulated through doping and control of the Curie temperature (Tc).
  • Some popular dopant materials are tungsten (W), manganese (Mn), and magnesium (Mg), introduced as oxides, However, other equivalent elements in the same column of the periodic table may also be practical.
  • An FE material has its greatest dielectric constant at Tc, with the dielectric falling off rapidly with changes of temperature in either direction. However, there is typically less change in dielectric constant for temperature above Tc. Therefore, the Tc of an FE material is typically chosen to be below the operating temperature seen by the dielectric material.
  • An antenna built with a dielectric constant of 1 (air) has less loss than an antenna built with higher dielectric constant material.
  • higher dielectric constant materials are often useful in reducing the size (the effective wavelength) of antennas.
  • an antenna designer seeks a dielectric material with dielectric constant of less than 100.
  • the FE material dielectric constants can be reduced by adding dopants at the cost of variability (less change in dielectric constant per bias volt). Suitable tradeoffs between Tc and doping can make practical a greater than 2:1 change in FE material dielectric for less than a volt change in bias voltage.
  • Fig. 14 is a flowchart illustrating the present invention method for frequency tuning a single-band wireless communications antenna. Although this method is depicted as a sequence of numbered steps for clarity, no order should be inferred from the numbering unless explicitly stated. It should be understood that some of these steps may be skipped, performed in parallel, or performed without the requirement of maintaining a strict order of sequence.
  • the methods start at Step 1400.
  • Step 1402 forms a single-radiator.
  • Step 1404 forms a counterpoise to the radiator.
  • Step 1406 forms a dielectric with ferroelectric material proximate to the radiator.
  • Step 1408 applies a voltage to the-ferroelectric material.
  • Step 1410 in response to applying the voltage, generates a dielectric constant.
  • Step 1412 in response to the dielectric constant, communicates electromagnetic fields at a resonant frequency.
  • Step 1414 varies the applied voltage.
  • Step 1416 modifies the resonant frequency in response to changes in the applied voltage.
  • modifying the resonant frequency includes forming an antenna with a variable operating frequency responsive to the applied voltage.
  • Forming an antenna with a variable operating frequency includes forming an antenna with a predetermined fixed characteristic impedance, independent of the resonant frequency. In other aspects, forming an antenna with a variable operating frequency includes forming an antenna with a predetermined approximately constant gain, independent of the resonant frequency.
  • forming a dielectric with ferroelectric material in Step 1406 includes substeps.
  • Step 1406a forms the dielectric with a dielectric material from a first material having a fixed dielectric constant.
  • Step 1406b forms the dielectric with the ferroelectric material having a variable dielectric constant.
  • modifying the resonant frequency in response to the varying dielectric constant in Step 1416 includes modifying the resonant frequency in response to the varying the dielectric constant of the ferroelectric material.
  • forming a dielectric with ferroelectric material in Step 1406 includes forming the dielectric with a plurality of dielectric materials, each from a material having a fixed dielectric constant.
  • Step 1406 can include forming the dielectric with a plurality of ferroelectric materials, each having a variable dielectric constant.
  • Step 1406 includes forming the dielectric with the fixed dielectric constant adjacent the dielectric with the ferroelectric materials.
  • Step 1406a includes forming the dielectric with the fixed dielectric constant adjacent the radiator.
  • Step 1406b includes forming the dielectric with the ferroelectric material adjacent the radiator.
  • forming a dielectric with a fixed dielectric constant in Step 1406a includes forming the dielectric from a material selected from the group including foam, air, FR4, Aluminina, and TMM.
  • Step 1406b includes forming the dielectric with the ferroelectric material from barium strontium titanate, Ba x Sr 1-x TiO 3 (BSTO).
  • Step 1406 includes forming the dielectric with ferroelectric material includes forming the ferroelectric material in a thin film having a thickness in the range from 0.15 to 2 microns. Alternately, a thick film having a thickness in the range from 1.5 to 1000 microns can be formed. In some aspects Step 1406 includes forming a dielectric with a dielectric constant in the range between 100 and 5000 at zero volts. In other aspects, forming the dielectric with ferroelectric material includes forming a FE dielectric layer (Step 1406b) and a fixed constant dielectric layer (Step 1406a) with a composite dielectric constant in the range between 2 and 100 at zero volts.
  • communicating electromagnetic fields at a resonant frequency in Step 1412 includes communicating at resonant frequencies such as 824 and 894 MHz and 1850 and 1990 MHz.
  • applying a voltage to the ferroelectric material in Step 1410 includes applying a relative dc voltage in the range between 0 and 3.3 volts.
  • Fig. 15 is a flowchart illustrating an alternate aspect of the method depicted in Fig. 14 .
  • the method starts at Step 1500.
  • Step 1502 providing a single-radiator proximate to a dielectric with ferroelectric material.
  • Step 1504 applies a voltage to the ferroelectric material.
  • Step 1506, in response to the applying voltage, varies the dielectric constant of the ferroelectric material.
  • FE dielectric material is applicable to any antenna using a dielectric.
  • FE dielectric placement has been given, but once again the present invention is not limited to merely these examples.
  • Other variations and embodiments of the invention will occur to those skilled in the art.

Landscapes

  • Waveguide Aerials (AREA)

Claims (5)

  1. Antenne à fentes (600) présentant une fréquence de fonctionnement pouvant être sélectionnée, l'antenne à fentes comprenant :
    une ligne coaxiale comprenant :
    un contrepoids (602) ;
    un élément rayonnant (604) ;
    au moins une fente (608) formée sur une surface extérieure de la ligne coaxiale comprenant l'un du contrepoids (602) et de l'élément rayonnant (604) ;
    caractérisée par :
    un diélectrique qui comprend un matériau ferroélectrique (606) formé entre l'élément rayonnant (604) et le contrepoids (602), et sur une longueur de la ligne coaxiale à proximité de la ou des fentes (608) ;
    un diélectrique fixe (607) formé entre l'élément rayonnant (604) et le contrepoids (602) sur la longueur restante de la ligne coaxiale ;
    dans laquelle la fente (608) présente une longueur électrique sensible à la variation de la constante diélectrique du matériau ferroélectrique (606) ;
    dans laquelle le diélectrique qui comprend le matériau ferroélectrique (606) comprend une section diélectrique variable (612) et une section diélectrique fixe (610) concentriques par rapport à l'élément rayonnant (604) ; et
    dans laquelle la section diélectrique variable (612) et la section diélectrique fixe (610) sont concentriques.
  2. Antenne à fentes (600) selon la revendication 1, dans laquelle la longueur électrique de la fente (608) est approximativement égale à l'un d'une moitié de longueur d'onde et d'un quart de longueur d'une fréquence de résonance.
  3. Antenne à fentes (600) selon l'une quelconque des revendications 1 et 2, dans laquelle la section diélectrique variable (612) est formée entre les sections concentriques extérieure et intérieure (610a, 610b) de la section diélectrique fixe (610).
  4. Antenne à fentes (600) selon la revendication 1, dans laquelle le diélectrique qui comprend le matériau ferroélectrique (606) est formé à partir de titanate de baryum strontium, BaxSr1 - xTiO3 (BSTO).
  5. Antenne à fentes (600) selon l'une quelconque des revendications 1 à 4, dans laquelle la section diélectrique variable (612) est formée à l'intérieur de la section diélectrique fixe (610) dans une zone qui se situe directement à proximité de la fente.
EP06123190A 2001-04-11 2002-04-04 Antenne à fentes ferroélectrique Expired - Lifetime EP1753084B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US28309301P 2001-04-11 2001-04-11
US09/904,631 US6690251B2 (en) 2001-04-11 2001-07-13 Tunable ferro-electric filter
US09/912,753 US6639491B2 (en) 2001-04-11 2001-07-24 Tunable ferro-electric multiplexer
US09/927,732 US6690176B2 (en) 2001-04-11 2001-08-08 Low-loss tunable ferro-electric device and method of characterization
US09/927,136 US6825818B2 (en) 2001-04-11 2001-08-10 Tunable matching circuit
EP02718438A EP1384285B1 (fr) 2001-04-11 2002-04-04 Antenne ferroelectrique et procede d'accord de celle-ci

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EP02718438A Division EP1384285B1 (fr) 2001-04-11 2002-04-04 Antenne ferroelectrique et procede d'accord de celle-ci
EP02718438.1 Division 2002-04-04

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US9407976B2 (en) 2014-02-04 2016-08-02 Raytheon Company Photonically routed transmission line
US9437921B2 (en) 2014-02-04 2016-09-06 Raytheon Company Optically reconfigurable RF fabric
US9639001B2 (en) 2014-02-04 2017-05-02 Raytheon Company Optically transitioned metal-insulator surface
US9728668B2 (en) 2014-02-04 2017-08-08 Raytheon Company Integrated photosensitive film and thin LED display

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FR3072832B1 (fr) * 2017-10-19 2019-10-18 Universite De Rennes 1 Systeme antennaire agile optiquement transparent

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US9407976B2 (en) 2014-02-04 2016-08-02 Raytheon Company Photonically routed transmission line
US9437921B2 (en) 2014-02-04 2016-09-06 Raytheon Company Optically reconfigurable RF fabric
US9639001B2 (en) 2014-02-04 2017-05-02 Raytheon Company Optically transitioned metal-insulator surface
US9728668B2 (en) 2014-02-04 2017-08-08 Raytheon Company Integrated photosensitive film and thin LED display
US9985166B2 (en) 2014-02-04 2018-05-29 Raytheon Company Integrated photosensitive film and thin LED display

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