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21.发明授权
公开(公告)号：US5745077A
公开(公告)日：1998-04-28
申请号：US665309
申请日：1996-06-17
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H01Q23/00 , H01Q25/007 , H01Q3/40
Abstract: A design of equally loaded, under varying traffic load conditions, power amplifiers for a multibeam satellite is presented. Each output beam contains signals of only one beam corresponding to its input beam. The output beams are shaped to produce a small reduction of power at the crossover point of adjacent beams. MMIC and high Tc superconducting designs, including the design of high Tc superconducting reflector antenna, are presented.
Abstract translation: 提出了一种同样负载的，在变化的交通负荷条件下的多波束卫星的功率放大器的设计。 每个输出光束包含仅对应于其输入光束的一个光束的信号。 输出光束被成形为在相邻光束的交叉点处产生小的功率减小。 提出了MMIC和高Tc超导设计，包括高Tc超导反射器天线的设计。
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公开(公告)号：US5617104A
公开(公告)日：1997-04-01
申请号：US616337
申请日：1996-03-15
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H01Q1/364 , H03B9/142 , H03B15/00 , H03B2201/0241 , H03B5/1882
Abstract: Three embodiments of a tunable ferroelectric transmitting system are included. Each embodiment includes a tunable oscillator and a tunable antenna. Two embodiments include a negative resistance diode, the frequency of oscillation being controlled by a single crystal tunable ferroelectric resonator. The third embodiment uses a transistor. The tunable antenna is made of a single crystal tunable ferroeletric resonator. All conducting depositions are made of films of a high Tc superconducting material.
Abstract translation: 包括可调谐铁电传输系统的三个实施例。 每个实施例包括可调谐振荡器和可调谐天线。 两个实施例包括负电阻二极管，振荡频率由单晶可调铁电谐振器控制。 第三实施例使用晶体管。 可调天线由单晶可调铁电谐振器制成。 所有导电沉积由高Tc超导材料的薄膜制成。
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Patent Agency Ranking
公开(公告)号：US5589440A
公开(公告)日：1996-12-31
申请号：US207750
申请日：1994-03-09
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H03G11/006 , Y10S505/70 , Y10S505/703 , Y10S505/866
Abstract: High Tc superconducting limiters are designed to operate at two or more levels of input signals. In one waveguide embodiment, multiple half wavelength branch waveguide lines are connected to a main waveguide line. The half wavelength lines are terminated with tuned circuits of a capacitance, made of a ferroelectric material, and an inductance provided by a waveguide line. In another waveguide embodiment, the branch lines are terminated in tuned cavities each having a ferroelectric material. In a microstrip embodiment, multiple half wavelength branch ferroelectric lines of different impedances are connected to a main line. In a second microstrip line embodiment, tuned circuits, with differing L and C values, are connected to a main transmission line through a half a wavelength branch transmission line. The capacitance is made of a ferroelectric material. The conductor, deposited on the microstrip lines, and the waveguides are made of a single crystal high Tc superconductor.
Abstract translation: 高Tc超导限制器被设计为在两个或更多级别的输入信号上工作。 在一个波导实施例中，多个半波长分支波导线连接到主波导线。 半波长线由铁电材料制成的电容调谐电路和由波导线提供的电感端接。 在另一个波导实施例中，分支线端接在各自具有铁电材料的调谐腔中。 在微带实施例中，具有不同阻抗的多个半波长分支铁电线连接到主线。 在第二微带线实施例中，具有不同L和C值的调谐电路通过半波长分支传输线连接到主传输线。 电容由铁电材料制成。 沉积在微带线上的导体和波导由单晶高Tc超导体制成。
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公开(公告)号：USD373083S
公开(公告)日：1996-08-27
申请号：US029764
申请日：1994-10-17
Applicant: Satyendranath Das
Designer： Satyendranath Das
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公开(公告)号：US5451567A
公开(公告)日：1995-09-19
申请号：US219913
申请日：1994-03-30
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H01P1/181 , Y10S505/70 , Y10S505/701 , Y10S505/866
Abstract: The high power ferroelectric RF phase shifter contains a ferroelectric material in a microstrip line section. Between the ferroelectric phase shifter and the input, there is a ferroelectric matching transformer. Between the ferroelectric phase shifter and the output, there is a quarter wave ferroelectric matching transformer. A bias field is connected across the top and bottom surfaces of the ferroelectric material. When a bias field is applied across the ferroelectric material, the permittivity is reduced and as such the velocity of propagation is increased. This causes an increase in the effective electrical length of the phase shifter. Increasing the bias voltage increases the phase shift. The ferroelectric RF phase shifter may be constructed of a ferroelectric liquid crystal (FLC). The ferroelectric material is operated above its Curie temperature.
Abstract translation: 高功率铁电RF移相器在微带线部分中包含铁电材料。 在铁电相移器和输入端之间有一个铁电匹配变压器。 在铁电移相器和输出之间，有一个四分之一波长的铁电匹配变压器。 偏置电场连接在铁电材料的顶表面和底表面之间。 当跨越铁电材料施加偏置场时，介电常数降低，传播速度增加。 这导致移相器的有效电长度的增加。 增加偏置电压会增加相移。 铁电RF移相器可以由铁电液晶（FLC）构成。 铁电材料的运行高于居里温度。
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公开(公告)号：US5450092A
公开(公告)日：1995-09-12
申请号：US54022
申请日：1993-04-26
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H01Q3/44
Abstract: The ferroelectric scanning RF antenna includes a ferroelectric material having conductors deposited thereon that are connected to an adjustable d.c. or a.c. voltage source. The scanning antenna is placed in an RF transmission line that includes appropriate input and output impedance matching devices such as quarter-wave transformers. The scanning section of the RF scanning antenna is constructed of two prismatic structures of a ferroelectric material. When the two prismatic structures are at the same zero bias voltage, then the RF energy passing through the antenna is not deflected and a boresight radiation pattern is obtained. Application of a bias voltage reduces the permittivity and the refractive index of the outer prismatic structure. The RF energy is refracted away from the normal at the interface between the prismatic surfaces and the radiation pattern is scanned in one direction. Application of a bias voltage reduces the permittivity and the refractive index of the inner prismatic structure. The input RF energy is refracted towards the normal at the boundary of the two prismatic surfaces and the RF radiation pattern is scanned in the opposite direction. The scanning part of the ferroelectric scanning RF antenna may be embedded as part of a monolithic microwave integrated circuit. The scanning part of the ferroelectric scanning RF antenna may be constructed of a thin ferroelectric film. The copper losses is reduced by using a high Tc superconductor material as the conducting surface. The ferroelectric material is operated in the paraelectric phase slightly above its Curie temperature.
Abstract translation: 铁电扫描RF天线包括具有沉积在其上的导体的铁电材料，其连接到可调节的直流电。 或a.c. 电压源。 扫描天线被放置在包括适当的输入和输出阻抗匹配装置（例如四分之一波长变压器）的RF传输线中。 RF扫描天线的扫描部分由铁电材料的两个棱柱结构构成。 当两个棱镜结构处于相同的零偏置电压时，通过天线的RF能量不被偏转，并且获得视轴辐射图。 偏置电压的应用降低了外部棱柱结构的介电常数和折射率。 RF能量在棱镜表面之间的界面处从法线折射，并且辐射图案沿一个方向扫描。 施加偏压降低了内棱镜结构的介电常数和折射率。 输入RF能量在两个棱镜表面的边界处朝向法线折射，并且RF辐射图案沿相反方向扫描。 铁电扫描RF天线的扫描部分可以嵌入作为单片微波集成电路的一部分。 铁电扫描RF天线的扫描部分可以由薄铁电体膜构成。 通过使用高Tc超导体材料作为导电表面来减少铜损耗。 铁电材料在略高于其居里温度的顺电阶段运行。
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公开(公告)号：US5407905A
公开(公告)日：1995-04-18
申请号：US135398
申请日：1993-10-13
Applicant: Satyendranath Das
Inventor： Satyendranath Das
CPC classification number: H01P5/181 , Y10S505/70 , Y10S505/866
Abstract: To reduce losses of commercial room temperature couplers, high Tc superconducting waveguides and waveguide flanges are used for couplers. There are two approaches for making these high Tc superconducting waveguide structures. One is to use a single crystal such as YBaCuO (YBCO), cut and machine the crystal to the desired shape, and use high Tc superconducting flanges. In the second method, a good quality dielectric, such as sapphire is used and cut and machined to the desired shape. The conducting surfaces are coated with a single crystal high Tc superconducting material such as YBCO. The waveguides are brazed together. Low loss is important particularly for high power couplers. Significant amount of RF power is lost even with a low loss coupler. The high Tc superconducting couplers will provide a significant benefit in high power RF systems handling power levels such as 0.5 megawatts.
Abstract translation: 为了减少商业室温耦合器的损耗，高Tc超导波导和波导法兰用于耦合器。 制造这些高Tc超导波导结构有两种方法。 一种是使用YBaCuO（YBCO）等单晶，将晶体切割并加工成所需的形状，并使用高Tc超导法兰。 在第二种方法中，使用诸如蓝宝石的良好质量的电介质，并将其切割并加工成所需的形状。 导电表面涂覆有诸如YBCO的单晶高Tc超导材料。 波导钎焊在一起。 低损耗对于大功率耦合器尤为重要。 即使使用低损耗耦合器，也会损失大量的RF功率。 高Tc超导耦合器将在处理功率水平（如0.5兆瓦）的大功率射频系统中提供显着的优势。
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