-
公开(公告)号：US5528251A
公开(公告)日：1996-06-18
申请号：US417838
申请日：1995-04-06
申请人： Harry S. Frein
发明人： Harry S. Frein
CPC分类号： H01Q9/16
摘要： A double dipole tuned antenna is presented having the capability to enhance the television reception, particularly on VHF frequencies. The antenna has an outer, longer diverging dipole antenna connected near its midsection to an inner, shorter, parallel diverging dipole. Also connected to the inner dipole is a large helical coil and a smaller helical coil. A capacitor is placed in parallel across opposite ends of the smaller helical coil in order to tune the device. The device is particularly useful for tuning VHF frequencies although it is also useful in tuning UHF frequencies.
摘要翻译： 提出了一种双偶极调谐天线，具有增强电视接收的能力，特别是在VHF频率上。 天线具有在其中部附近连接到内部，较短，平行的发散偶极子的外部较长的发散偶极天线。 还连接到内偶极子是大的螺旋线圈和较小的螺旋线圈。 电容器平行放置在较小螺旋线圈的相对端，以调谐该装置。 该器件对于调谐VHF频率特别有用，尽管它也可用于调谐UHF频率。
-
公开(公告)号：US5424751A
公开(公告)日：1995-06-13
申请号：US182774
申请日：1994-01-18
申请人： Coleman D. Collier
发明人： Coleman D. Collier
摘要： The invention is to a gamma matching antenna in which a motor driven shunt is used to adjust the gamma match feed line. The shunt is movable along the antenna driven element and the gamma march rod on brushes or rollers that are in good electrical contact with the gamma rod and driven element, and allows the shunt to move along both element without binding. A control circuit moves the shunt in response to, and to minimize the SWR of the antenna.
摘要翻译： 本发明涉及一种伽马匹配天线，其中使用马达驱动分流器来调节伽马匹配馈线。 分流器可以沿着天线驱动元件和伽马行进杆移动到与伽马棒和驱动元件良好电接触的电刷或滚子上，并且允许分流器沿两个元件移动而不绑定。 控制电路响应于天线移动分路并使天线的SWR最小化。
-
公开(公告)号：US5367310A
公开(公告)日：1994-11-22
申请号：US775035
申请日：1991-10-11
申请人： Thomas J. Warnagiris
发明人： Thomas J. Warnagiris
CPC分类号： H01Q9/30 , H01Q3/2676
摘要： A system for switching an antenna formed of multiple connected segments is set forth. The various segments are connected together by a switch means having, in the preferred embodiment, one or more FETs; a gate controlled terminal is connected with a bias circuit which is biased on or off by a bias circuit triggered to switch by light. The light is coupled through an optical fiber which directs light onto a portion of the bias circuit to cause operation. The bias circuit preferably includes a photo voltaic cell.
摘要翻译： 阐述了一种用于切换由多个连接段形成的天线的系统。 各个部分通过在优选实施例中具有一个或多个FET的开关装置连接在一起; 栅极控制端子与偏置电路连接，该偏置电路通过触发切换为光的偏置电路而被偏置或断开。 光通过将光引导到偏置电路的一部分上以引起操作的光纤耦合。 偏置电路优选地包括光伏电池。
-
94.发明授权
公开(公告)号：US5347291A
公开(公告)日：1994-09-13
申请号：US82915
申请日：1993-06-29
申请人： Richard L. Moore
发明人： Richard L. Moore
摘要： An electrically short antenna for transmitting or receiving radiation has first and second electrode forming a capacitor radiator. The antenna is short in the sense that the gap distance between the electrodes and the dimension of the electrodes themselves sum to less than .lambda./4. An inductor has one end thereof coupled to one of the first and second electrodes via a first wire, and the other of the electrodes is connected to ground via a second wire. The antenna includes structure for inhibiting transmission or reception of electromagnetic energy of wavelength .lambda. from first and second wires so that transmission or reception of electromagnetic energy primarily emanates from said electrode surfaces.
摘要翻译： 用于发射或接收辐射的电短天线具有形成电容器辐射器的第一和第二电极。 在这种意义上说，天线是短的，即电极间的间隙距离和电极的尺寸总和小于λ/ 4。 电感器的一端通过第一线耦合到第一和第二电极中的一个，并且另一个电极通过第二导线连接到地。 天线包括用于抑制从第一和第二导线发射或接收波长λ的电磁能的结构，使得电磁能的传输或接收主要从所述电极表面发出。
-
95.发明授权
公开(公告)号：US5278573A
公开(公告)日：1994-01-11
申请号：US562749
申请日：1990-08-06
申请人： Risto Siikarla
发明人： Risto Siikarla
摘要： An electronic article surveillance tag comprises a reradiator element, a nonlinear element connected electrically to the reradiator element, and an electrical ground plane member connected electrically to the nonlinear element. The reradiator element, the nonlinear element and the ground plane member are in electrical series circuit connection. The reradiator element and the ground plane member define a monopole antenna upon incidence on the tag of high frequency energy for reradiation of the high frequency energy and further define a dipole antenna upon incidence on the tag of energy of frequency substantially lower than the high frequency energy. An electronic article surveillance system in accordance with the invention comprises a transmitter-receiver arrangement disposed aside an area to be controlled for transmitting a first high-frequency signal into the area, a transmitter disposed aside the area and generating a second frequency signal of substantially lower frequency than the first frequency for establishing in the area an electrostatic field, a tag for attachment to an article to be subject to surveillance, the tag being responsive to the incidence thereon of energy of both the first and second frequencies to transmit a composite thereof and receiver apparatus disposed aside the area for receipt and detection of such composite signal and for generation of an output signal indicative of such detection.
摘要翻译： 电子物品监视标签包括再散热器元件，与再散热器元件电连接的非线性元件，以及电连接到非线性元件的电接地平面元件。 重新散热器元件，非线性元件和接地平面构件处于电串联电路连接。 重新辐射器元件和接地平面构件在入射到高频能量标签上时限定单极天线，用于重新辐射高频能量，并且当入射到基本上低于高频能量的频率的能量标签上时，还限定偶极子天线 。 根据本发明的电子物品监视系统包括：发射器 - 接收器装置，布置在被控制的区域旁边以将第一高频信号发射到该区域中;发射机布置在该区域旁边，并产生基本上较低的第二频率信号 频率高于用于在该区域中建立静电场的第一频率，用于附接到待监视的物品的标签，标签响应于其上的第一和第二频率两者的能量的发射，以传输其复合物;以及 接收机设备放置在用于接收和检测这种复合信号的区域之外，并用于产生指示这种检测的输出信号。
-
公开(公告)号：US4633263A
公开(公告)日：1986-12-30
申请号：US648544
申请日：1984-09-07
申请人： Saul Altshuler
发明人： Saul Altshuler
摘要： An antenna system for radiating information in the ELF range is disclosed and comprises an extended conductor sized to produce a corona at the operating voltage. In the preferred embodiment, "ultra-thin" wire is used as the antenna element for weight savings and is lofted by means of a tether line which absorbs the stresses. Means are provided for helically winding the antenna element around the tether line.
摘要翻译： 公开了一种用于在ELF范围内辐射信息的天线系统，并且包括扩展的导体，其尺寸设计成在工作电压下产生电晕。 在优选实施例中，使用“超薄”线作为天线元件，用于减轻重量，并且通过吸收应力的系绳来摆放。 提供了用于将天线元件螺旋缠绕在系绳线周围的装置。
-
公开(公告)号：US4089005A
公开(公告)日：1978-05-09
申请号：US758247
申请日：1977-01-10
申请人： Raymond G. Immell , Bill H. Sasser
发明人： Raymond G. Immell , Bill H. Sasser
摘要： First and second elements mounted in parallel spaced apart relation with one end shorted to form a quarterwave transmission line at a base frequency and a halfwave transmission line at an even harmonic thereof, with the spacing being .lambda./8 at the base frequency and .lambda./4 at the harmonic and a feedline being connected between the elements and positioned so the impedance of the antenna matches the impedance of the feedline at the base frequency and the diameter of the feedline being adjusted so the impedance of the antenna matches the impedance of the feedline at the harmonic frequency.
摘要翻译： 第一和第二元件与一端平行间隔地安装，以短路形成基波频率处的四分之一波长传输线，以及其谐波谐波处的半波传输线，其基准频率处的间隔为λ/ 8，λ/ 4 谐波和馈线连接在元件之间并且被定位成使得天线的阻抗匹配基准频率处的馈线的阻抗并且调节馈线的直径，使得天线的阻抗与馈线的阻抗匹配在 谐波频率。
-
公开(公告)号：US4085405A
公开(公告)日：1978-04-18
申请号：US740313
申请日：1976-11-09
申请人： Edson L. Barlow
发明人： Edson L. Barlow
CPC分类号： H01Q1/3283 , H03H7/38 , H03H2007/386
摘要： An antenna matching network for matching a citizens band radio transceiver to a standard automotive whip or windshield antenna utilizes a matching section for matching the nominal 50 ohm output of the citizens band transceiver to the generally lower impedance of the automotive antenna. A trap tuned to the citizens band prevents the output of the citizens band transmitter from damaging the automotive broadcast receiver when transmitting. The matching section is tunable over a sufficient range to match the citizens band transceiver to most automotive antennas, and a dual sensitivity indicator is utilized to aid the operator in tuning the matching network to provide optimum matching without the use of specialized equipment.
摘要翻译： 用于将公民频带无线电收发器与标准汽车鞭状或挡风玻璃天线匹配的天线匹配网络利用匹配部分将公民频带收发器的标称50欧姆输出与汽车天线的大体上较低的阻抗相匹配。 调整到公民乐队的陷阱阻止了公民频带发射机的输出在发射时损坏汽车广播接收机。 匹配部分可以在足够的范围内调整，以匹配大多数汽车天线的公民频带收发器，并且使用双灵敏度指示器来帮助操作者调整匹配网络，以提供最佳匹配而不使用专门的设备。
-
公开(公告)号：US4080604A
公开(公告)日：1978-03-21
申请号：US725183
申请日：1976-09-21
申请人： Thomas M. Wosniewski
发明人： Thomas M. Wosniewski
摘要： A loading coil connects between an antenna and ground and has an intermediate feed point. A conductive member opposes at least several turns of the loading coil and is disposed in distributed capacitive relationship therewith. The conductive member and coil are separated by a dielectric member. The conductive member is preferably movable with respect to the coil to change the resonant frequency of the antenna and may be a conductive ring or disk axially shiftable with respect to the coil or a vane pivotable with respect to such coil. In one embodiment, the conductive member is fixed and the dielectric member, having a dielectric constant different from air, is shiftable to change the distributed capacitance of the conductive member and coil and hence the resonant frequency of the antenna apparatus.
摘要翻译： 加载线圈连接在天线和地面之间，并具有中间馈电点。 导电构件与负载线圈的至少几匝相对，并且以与其分布的电容关系设置。 导电构件和线圈由介电构件分开。 导电构件优选地相对于线圈可移动以改变天线的谐振频率，并且可以是相对于线圈或相对于这种线圈可枢转的叶片可轴向移动的导电环或盘。 在一个实施例中，导电构件是固定的，具有不同于空气的介电常数的电介质构件可移动以改变导电构件和线圈的分布电容，并因此改变天线装置的谐振频率。
-
公开(公告)号：US3838429A
公开(公告)日：1974-09-24
申请号：US38538273
申请日：1973-08-03
申请人： US ARMY
发明人： REGGIA F
CPC分类号： H01Q9/36
摘要： A miniaturized antenna having high radiation efficiency consists essentially of an open circuit transmission line top-loading a short monopole over a metal ground plane. The currents in the two sides of the transmission line, being oppositely directed, tend to cancel each other''s effect in the distant field. Thus, only the short vertical monopole contributes to the distant field radiation. The omnidirectional monopole is a constant current radiating element operating at near RF ground potential (high current, low impedance).
摘要翻译： 具有高辐射效率的小型化天线基本上由在金属接地平面上加载短单极子的开路传输线组成。 传输线两侧的相反方向的电流倾向于抵消在远处的影响。 因此，只有短的垂直单极子有助于远距离的场辐射。 全向单极子是在近RF地电位（大电流，低阻抗）下工作的恒流辐射元件。
-
-
-
-
-
-
-
-
-
搜索结果
582 条记录 (耗时 0.017 秒)
