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    • 55. 发明授权
    • Helical antenna for a portable radio apparatus
    • 用于便携式无线电设备的螺旋天线
    • US6011964A
    • 2000-01-04
    • US920830
    • 1997-08-29
    • Tetsuya Saitoh
    • Tetsuya Saitoh
    • H01Q1/24H01Q5/10H01Q5/55H01Q9/14H01Q9/30H01Q11/08H04B1/38H04Q7/20
    • H01Q11/08H01Q9/14
    • A helical antenna is provided for portable radio apparatus characterized in having one communication band switch and having two separated communication bands, or a broad communication band. The helical antenna comprises a screw shaped emitting element having one power supply terminal and two communication band switching terminals, a switch which short circuits and disconnects the two communication band switching terminals, and a switch drive circuit which drives this switch, and in accordance with an externally applied signal, the switch drive circuit short circuits or disconnects the switch, and by means of the disconnection or short circuiting of the two communication band switching terminals, the resonance frequency is switched.
    • 提供了一种用于便携式无线电设备的螺旋天线,其特征在于具有一个通信频带开关并且具有两个分开的通信频带或宽的通信频带。 螺旋天线包括具有一个电源端子和两个通信频带切换端子的螺钉形发射元件,用于短路和断开两个通信频带切换终端的开关以及驱动该开关的开关驱动电路,并且根据 外部施加的信号,开关驱动电路短路或断开开关,并且通过两个通信频带切换端子的断开或短路,谐振频率被切换。
    • 56. 发明授权
    • Combined radar altimeter, radiometer sensor employing multiport feed
horn having blended sidewall geometry
    • 组合雷达高度计,辐射计传感器采用具有混合侧壁几何形状的多端口进料喇叭
    • US5175555A
    • 1992-12-29
    • US670317
    • 1991-03-15
    • Larry T. HolakMichael J. LynchJames Conn
    • Larry T. HolakMichael J. LynchJames Conn
    • G01S13/86H01Q5/00H01Q5/55H01Q13/02
    • H01Q13/02G01S13/86H01Q5/55
    • A remote sensing apparatus for conducting (spaceborne) measurements of ocean geophysical parameters integrates a radar altimeter subsystem with a radiometer subsystem through the use of a shared antenna feed horn that permits each subsystem to have the same viewing aperture, so that each subsystem sees the same location on the ocean. The horn is a multiport, multifrequency horn having a throat and a tapered sidewall portion extending from the throat to the outer edge of the horn. A first sidewall port is coupled to the transmit/receive channel of the radar altimeter. A second sidewall port is coupled to a first receive channel of the radiometer, and a third sidewall port is coupled to a second receive channel of the radiometer. A throat port is coupled to a third receive channel of the radiometer. The tapered sidewall portion has a first, generally linear shape adjacent to the throat, a second, conic (elliptical) shape at its outer edge, and a third, blending shape disposed between and joining together the generally linear shape and the conic shape at the outer edge. The blending shape is preferably a sinusoidal function and serves to blend the first shape into the second shape in such a manner that the horn presents, over the entirely of the surface of the sidewall portion, an effectively continuous surface to the E plane of an electromagnetic wave emitted or received by the horn. The distance over which the sidewall portion is tapered to effect the blending function is preferably no greater than two wavelengths of the lowest frequency of electromagnetic waves emitted or received by the horn.
    • 用于进行海洋地球物理参数(空间)测量的遥感设备通过使用共享天线馈电喇叭将雷达高度计子系统与辐射计子系统集成,从而允许每个子系统具有相同的观察孔径,使得每个子系统看起来相同 海洋位置。 喇叭是具有喉部的多端口多频喇叭和从喉部延伸到喇叭外缘的锥形侧壁部分。 第一侧壁端口耦合到雷达高度计的发射/接收信道。 第二侧壁端口耦合到辐射计的第一接收通道,并且第三侧壁端口耦合到辐射计的第二接收通道。 喉口连接到辐射计的第三接收通道。 锥形侧壁部分具有与喉部相邻的第一大致直线形状,在其外边缘处具有第二圆锥形(椭圆形)形状,以及第三混合形状,其设置在第一,第二,第二,第二, 外部边缘。 混合形状优选地是正弦函数,并且用于将第一形状混合成第二形状,使得喇叭在整个侧壁部分的表面上呈现与电磁体的E平面的有效连续的表面 由喇叭发射或接收的波。 侧壁部分为了实现混合功能而渐变的距离优选地不大于由喇叭发射或接收的最低频率的电磁波的两个波长。