公开(公告)号：WO1988008624A1

公开(公告)日：1988-11-03

申请号：PCT/US1988001230

申请日：1988-04-19

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  VODOPIA, Samuel, N.

IPC: H01Q25/02

CPC classification number: H01Q25/02 ,  H01Q1/185

Abstract: An active array system with electronic roll stabilization of the difference patterns, and with arbitrary partitioning of the phase scanned aperture with no hardware changes. The array system comprises a large number of radiating elements forming the array, with individual transmit/receive active modules coupled to each radiating element. In each active module, the received signal is amplified and then divided (164) into three signal components. Two of the signal components are passed through a bi-state phase shifter (166, 168) for selectively phase shifting the signal component by 0 to 180 degrees. The selectively phase shifted receive signals are then coupled to the respective azimuth and elevation difference channels (92, 93). The third signal component is coupled to the sum channel (91) network. The respective sum and difference channels all provide summing functions on the respective sum and differnce signals from each module. The phase shifters provide an output signal with either a positive or negative sign, so that in effect the module signals are ''differenced'' first and then summed.

公开(公告)号：WO1988008225A1

公开(公告)日：1988-10-20

申请号：PCT/US1988000834

申请日：1988-03-15

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  HO, Kesse ,  CAIN, Bradley, B.

IPC: H03F01/48

CPC classification number: H04N5/148 ,  H03F3/19

Abstract: A broadband, high speed, signal inverting video amplifier (10) comprises a generally conventional, main cascode amplifier (20) and first and second current boosting cascode amplifiers means (14, 16) which are capacitively (CB3, CB2) coupled to the main cascode amplifier (20). The first current boosting amplifier (14) provides a positive current spike (62) in response to an input video signal (22) abruptly decreasing, the positive current spike (62) provided thereby being fed into the main cascode amplifier (20) in a manner causing the current spike (62) to be added to current (I) through the main amplifier (20) when the amplified video signal (22) goes positive. The second current boosting amplifier (16) provides a negative current spike (64) in response to the input video signal abruptly increasing, the negative current spike (64) provided thereby being fed into the main cascode amplifier (20) in a manner causing the such current spike to be subtracted from the current (I) through the main amplifier (20) when the amplified video signal (22) goes negative. The positive and negative spikes (62, 64) cause the amplified output video signal (42) to have rise and fall times to be less than about 3.5 nanoseconds at loads (C TOTAL) of at least about 25 pf at peak-to-peak output voltages of at least about 40 volts and to be no more than about 1.8 nanoseconds at about 20 volts peak-to-peak for a load of (C TOTAL) about 14.5 pf.

公开(公告)号：WO1988008145A2

公开(公告)日：1988-10-20

申请号：PCT/US1988000866

申请日：1988-03-21

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ROMERO, Charles

IPC: G02B07/00

CPC classification number: G02B7/003

Abstract: A crystal modulator (20) is on an axis (19) which is positioned in translation and pivotal rotation with respect to another axis (17) of a laser. The crystal modulator (20) is supported in an inner housing (18) on axis (19). The inner housing is supported within an outer housing (16) which is affixed to the laser. Mating surfaces (32, 38) on the inner and outer housings are spherically contoured so that the inner housing may be pivoted about the center (24) of the extended sphere of the mating surfaces and thereby pivot axis (19) into coincidence with axis (17). An end (22) of the crystal modulator is positioned at this spherical center. Of two sets of four setscrews (26, 28) threaded into the outer housing, one set is disposed to contact the inner housing directly. The other set of screws is disposed to contact a ring (36) whose inner surface comprises one of the spherical surfaces. By adjustment of the screws, the axis of the inner housing may be linearly moved in a radial direction toward the laser optical axis until at least both axes intersect at the centerpoint (34) of the spherical surfaces. The set of setscrews (28) are adjusted to pivot the axis of the inner housing about the centerpoint of the spherical surfaces until the axes coincide.

Abstract translation: 晶体调制器（20）位于相对于激光器的另一轴线（17）平移和枢转旋转的轴线（19）上。 晶体调制器（20）被支撑在轴线（19）上的内壳体（18）中。 内壳体被支撑在固定到激光器的外壳体（16）内。 内壳体和外壳体上的接合表面（32,38）具有球形轮廓，使得内壳体可围绕配合表面的延伸球体的中心（24）枢转，从而使轴线（19）与轴线（19）重合 17）。 晶体调制器的端部（22）位于该球形中心。 在两个拧入外壳的四个固定螺丝（26,28）中的一组被设置成直接接触内壳。 另一组螺钉设置成接触其内表面包括一个球面的环（36）。 通过调节螺钉，内壳体的轴线可以沿着径向朝向激光光轴线性移动，直到至少两个轴线在球面的中心点（34）处相交。 调整固定螺丝组件（28）以使内壳体的轴线围绕球面的中心点枢转直到轴线重合。

公开(公告)号：WO1988007701A1

公开(公告)日：1988-10-06

申请号：PCT/US1988000471

申请日：1988-02-16

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LITTLE, Michael, J. ,  EFRON, Uzi ,  BRAATZ, Paul, O. ,  SCHWARTZ, Robert, N. ,  OWECHKO, Yuri ,  WELKOWSKY, Murray, S.

IPC: G02F01/135

CPC classification number: G02F1/133348 ,  G02F1/135

Abstract: A pulsed readout technique is described for liquid crystal light valves which eliminates the problem of readout beam leakage through the light valve mirror. The readout beam is pulsed on only when the light valve's semiconductor layer is out of a depletion state. This can occur during an accumulation state or, in certain applications, during a specially inserted quiescent period in the light valve voltage cycle. The invention is applicable to light valves with various types of modulating inputs, and can be used with either dielectric or metal matrix mirrors.

公开(公告)号：WO1988007266A1

公开(公告)日：1988-09-22

申请号：PCT/US1988000575

申请日：1988-02-23

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  PARAHM, O., D.

IPC: H01Q01/36

CPC classification number: H01Q1/362 ,  H01Q9/02

Abstract: An antenna employing a first capacitor formed by a conductive segment (17) disposed above a ground plane (11) and serially connected adjacent capacitors formed over the ground plane (11). The adjacent capacitors are connected to the ground plane by tuned circuits (31, 26), resulting in additive coupling of the E fields across the first and adjacent capacitors and the prevention of E field shunting.

公开(公告)号：WO1988006807A1

公开(公告)日：1988-09-07

申请号：PCT/US1988000182

申请日：1988-01-25

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  MACKIE, David, S. ,  NAKAMOTO, Mark

IPC: H01P01/39

CPC classification number: H01P1/39

Abstract: A wide band circulator of electromagnetic waves includes a cylindrical ferrite element (30) disposed within an encircling chamber (28) for supporting an electromagnetic wave which encircles the ferrite element upon application of a magnetic field along a cylindrical axis of the ferrite element. A set of ports (12) extend outward from a side wall of the chamber and are positioned uniformly about the cylindrical axis. Each of the ports is formed as a waveguide segment (22) having an inner terminus at the chamber configured with a height equal to a height of the chamber as measured along the cylindrical axis. In each port, the waveguide segment is tapered to an external terminus away from the chamber, the taper (38) enlarging the height of the waveguide segment during progression from the inner terminus to the external terminus. In each of the ports, the tapered portion of the waveguide segment extends at least one guide wavelength, and may be extended addition integral amounts of one half of the guide wavelength, this configuration enlarging the bandwidth of the circulator.

Abstract translation: 电磁波的宽带环行器包括设置在环绕室（28）内的圆柱形铁素体元件（30），用于在沿着铁氧体元件的圆柱轴施加磁场时支撑环绕铁素体元件的电磁波。 一组端口（12）从腔室的侧壁向外延伸并且围绕圆柱轴线均匀定位。 每个端口形成为波导段（22），其在室的内部末端被配置为具有等于沿着圆柱轴测量的室的高度的高度。 在每个端口中，波导段渐缩到远离腔室的外部终端，锥体（38）在从内部终端到外部终端的进程期间扩大了波导段的高度。 在每个端口中，波导段的锥形部分延伸至少一个引导波长，并且可以是引导波长的一半的扩展的积分量，这种配置扩大了循环器的带宽。

公开(公告)号：WO1988006391A1

公开(公告)日：1988-08-25

申请号：PCT/US1988000142

申请日：1988-01-22

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LEDEBUHR, Arno, G.

IPC: H04N09/31

CPC classification number: G02F1/133621 ,  G02B27/1033 ,  G02B27/145 ,  G02F2001/133622 ,  H04N9/3114 ,  H04N9/3167

Abstract: A color sequential illumination system (10) for a liquid crystal light valve (48). The invention operates with no moving parts and provides for the sequential illumination of a light valve (38) with at least two beams of different colors (B, R). The rate is fast enough that the colors fuse together and the viewer sees a composite color image. The system includes a prepolarizer (12) and dichroics (14, 16) for providing a first beam along a first optical path having a first color (B) and a first polarization (P) state and a second beam (R) along a second optical path having a second color (R) and said first polarization state (P). An optical switch (20, 22) is provided for selectively transmitting the first and second beams by sequentially changing the polarization state of each. Associated optical components (40, 42) are provided for directing the first and second beams onto the liquid crystal light valve (48).

公开(公告)号：WO1988006383A1

公开(公告)日：1988-08-25

申请号：PCT/US1988000344

申请日：1988-02-05

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  KINKEL, John, F.

IPC: H03L07/12

CPC classification number: H03L7/12 ,  Y10S331/02

Abstract: A phase lock loop (13) for use in carrier acquisition employing a predetection filter (45) and a loop filter (69, Fig. 2) switchable (79, Fig. 2) between a constant phase margin and second order characteristic. In the acquisition mode, the constant phase margin characteristic (R1+C1, R2+C2, R3+C3) is employed to acquire the carrier and the second order characteristic is thereafter employed to track the carrier. To avoid loss of lock when switching from the acquisition to the track mode, the second order characteristic retains only the pole at the origin and the lowest frequency zero of the constant phase margin characteristic (R1 and C1 in series). The loop filter (69) parameters are selected to minimize the mean square deviation of a phase margin expression which includes contributions from the predetection filter (45) pole and from positive poles generated by the loop's voltage controlled oscillator (71).

公开(公告)号：WO1988005552A1

公开(公告)日：1988-07-28

申请号：PCT/US1987003239

申请日：1987-12-07

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  COOK, Lacy, G.

IPC: G02B17/06

CPC classification number: G02B27/0025 ,  G02B17/0636

Abstract: The apparatus (10) comprises a primary mirror (14) to create an intermediate image (22) between the primary mirror (14) and a secondary mirror (16). The apparatus (10) further comprises a tertiary mirror (18) in optical communication with the secondary mirror (16).

Abstract translation: 设备（10）包括主镜（14），以在主镜（14）和副镜（16）之间形成中间图像（22）。 装置（10）还包括与次级反射镜（16）光学通信的第三级反射镜（18）。

公开(公告)号：WO1988005544A1

公开(公告)日：1988-07-28

申请号：PCT/US1988000120

申请日：1988-01-19

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  JAMISON, John, W. ,  ALLEN, Robert, E.

IPC: G01R31/28

CPC classification number: G01R1/0483

Abstract: An improved test apparatus (10) for testing leadless IC chip carriers (60) or IC dies. The apparatus employs a flexible film (50) on which is imprinted a conductor line pattern (54, 55) terminated in a plurality of raised conductive pads (52). The line pattern (54, 55) is readily formed on the film surface (50e) using photolithographic techniques. The conductive pads (52) are arranged on the film surface (50e) in such a way as to conform to the positioning of the edge contact terminals (61) of the chip carrier (60). A frame structure (25, 30) is provided for resiliently urging the chip carrier (60) against the surface (50e) of the film (50), with the edge terminals (61) of the chip carrier (60) in electrical contact with the raised pads (52) on the film (50). The conductor lines (54, 55) on the film (50) are also terminated in raised pads (47), which are urged against a printed wire pattern (46) on a rigid circuit board (45), which provides connections to the chip carrier test equipment. Thus, electrical contact is made to the chip carrier (60) without the use of wire bonds or solder connections.