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公开(公告)号：US5493311A
公开(公告)日：1996-02-20
申请号：US202495
申请日：1994-02-28
申请人： Ryoh Itoh , Yukio Yokoyama , Takao Ono
发明人： Ryoh Itoh , Yukio Yokoyama , Takao Ono
摘要： In order to achieve two-way communications at two different frequencies, an impedance matching circuit is coupled to an antenna. The circuit includes a first inductor which is directly coupled to the antenna. The first inductor induces antenna input impedance to be capacitive at a first resonant frequency and induces the antenna input impedance to be inductive at a second resonant frequency. The first resonant frequency is lower than the second resonant frequency. Further, a first capacitor is coupled to the first inductor. By providing the first capacitor, a reactance component at the first resonant frequency is rendered substantially equal to a reactance component at the second resonant frequency. Further, the circuit includes a second inductor and a second capacitor which are coupled between the second means and a feeder. The combination of the second inductor and the second capacitor is provided to adjust impedance, defined by the antenna and the first inductor and the first capacitor, to characteristic impedance of the feeder at the first and second resonant frequencies.
摘要翻译： 为了实现两个不同频率的双向通信，阻抗匹配电路耦合到天线。 电路包括直接耦合到天线的第一电感器。 第一电感器将天线输入阻抗在第一谐振频率处感应为电容，并且在第二谐振频率下引起天线输入阻抗为电感性。 第一谐振频率低于第二谐振频率。 此外，第一电容器耦合到第一电感器。 通过提供第一电容器，第一谐振频率处的电抗分量基本上等于第二共振频率处的电抗分量。 此外，电路包括耦合在第二装置和馈电器之间的第二电感器和第二电容器。 提供第二电感器和第二电容器的组合以将由天线和第一电感器和第一电容器限定的阻抗调整到在第一和第二谐振频率处的馈线的特征阻抗。
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公开(公告)号：US5438339A
公开(公告)日：1995-08-01
申请号：US201338
申请日：1994-02-24
申请人： Ryoh Itoh , Yukio Yokoyama , Takao Ono
发明人： Ryoh Itoh , Yukio Yokoyama , Takao Ono
摘要： A miniature and high performance antenna applicable to a radio communication apparatus and made up of a straight antenna rod and an antenna coil or coil element. A first whip antenna has a first portion retractable into the casing of the apparatus and a second portion constantly positioned externally of the casing. A second whip antenna has a coil element in the form of a loading coil having a predetermined number of turns. The second whip antenna is coaxially provided on the upper end of the first whip antenna and slidable relative to and in the axial direction of the first whip antenna. The second portion of the first whip antenna is movable between a position where one end of the coil element is disengaged from one end of the second portion and a position where the former is engaged with the latter. The antenna exhibits a desirable electric characteristic when pulled out of the casing of the apparatus and, in addition, promotes the efficient use of the limited space available in the casing.
摘要翻译： 适用于无线电通信设备并由直的天线杆和天线线圈或线圈元件组成的微型和高性能天线。 第一鞭状天线具有可伸缩到装置的壳体中的第一部分和恒定地位于壳体外部的第二部分。 第二鞭状天线具有具有预定匝数的加载线圈形式的线圈元件。 第二鞭状天线同轴地设置在第一鞭状天线的上端，并且可以相对于第一鞭状天线的轴向方向滑动。 第一鞭状天线的第二部分可以在线圈元件的一端与第二部分的一端分离的位置与前者与后者接合的位置之间移动。 当从设备的外壳拉出时，天线呈现出期望的电特性，并且还促进了有效利用壳体中可用的有限空间。
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公开(公告)号：US4583221A
公开(公告)日：1986-04-15
申请号：US545539
申请日：1983-10-26
申请人： Seiya Uchida , Takao Ono
发明人： Seiya Uchida , Takao Ono
摘要： A synchronization system for a key telephone system, in which information signals are transmitted in a time-division manner between a key service unit and each key telephone set. The information signal is formed by a control signal, a first signal transmitted from the key service unit to the key telephone set and a second signal from the key telephone set to the key service unit. The control signal is formed by a start signal of one-pulse and a variable synchronizing code, which is placed in a time slot following the start signal and which is formed by a plurality of pulses assuming one of predetermined consecutive values in a predetermined order for each transmission frame period. The control signal is transmitted from the key service unit to each key telephone set for each frame period in synchronism with a first counter provided at the key service unit for developing standard of transmission timings. At the key telephone set, the detecting position of the variable synchronizing code in a next frame period performed under control of controlled standard timings, which are developed by a second counter provided at the key telephone set, is shifted by one pulse until a correct start signal is detected if the variable code is not correctly detected in a certain frame period. As a result of the above operations, the standard transmission timings and the controlled transmission timings are synchronized with each other.
摘要翻译： 一种用于密钥电话系统的同步系统，其中以密钥服务单元和每个密钥电话机之间的时分方式发送信息信号。 信息信号由控制信号，从密钥服务单元发送到密钥电话机的第一信号和从密钥电话机到密钥服务单元的第二信号形成。 控制信号由单脉冲的起始信号和可变同步码构成，该可变同步码位于起始信号之后的时隙中，并且以预定的顺序假设为预定的连续值之一，由多个脉冲形成， 每个传输帧周期。 所述控制信号与所述密钥服务单元上提供的用于制定传输定时标准的第一计数器同步地从所述密钥服务单元发送到每个帧周期的每个密钥电话机。 在密钥电话机上，由在密钥电话机上提供的第二个计数器开发的受控标准定时控制下的下一个帧周期中的可变同步码的检测位置被移位一个脉冲，直到正确的开始 如果在某个帧周期内没有正确地检测到可变代码，则检测到信号。 作为上述操作的结果，标准传输定时和受控的传输定时彼此同步。
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