公开(公告)号：US06456832B1

公开(公告)日：2002-09-24

申请号：US09357128

申请日：1999-07-20

申请人： Wasuke Yanagisawa ,  Shozaburo Kameda ,  Ryo Horie ,  Haruhisa Uchida ,  Junichi Imai ,  Yuichi Kagoshima

发明人： Wasuke Yanagisawa ,  Shozaburo Kameda ,  Ryo Horie ,  Haruhisa Uchida ,  Junichi Imai ,  Yuichi Kagoshima

IPC分类号： H04B118

CPC分类号： H04B1/005 ,  H04B1/00 ,  H04B1/109 ,  H04B1/18 ,  H04B1/28 ,  H04B1/40 ,  H04B1/406

摘要： An antenna circuit which is improved the deterioration of amplitude characteristic in a strong electric field, an antenna circuit for AM broadcasting which can surely inhibit and damp FM-band signals in the strong electric field and amplifies to output AM-band signals, and an antenna circuit for AM/FM broadcasting in which AM-band signals are not damped by means of an FM-band filter. In the first antenna circuit, the output signal of an antenna (10) is supplied to the base of a transistor Tr2 forming a current amplification type amplifier having a high-input and low-output impedance and the emitter of the transistor Tr2 is grounded through a coil L6 and connected to an FM receiver (16) through a band-pass filter (38). In the second antenna circuit for receiving AM broadcasting, an input terminal is connected to an AM amplifier circuit (36) through coils (L7) and L8 in series and to the gate G of a field effect transistor FET. The source S of the transistor FET is grounded and the connecting point of the coils L7 and L8 is grounded through a capacitor C15 and a coil L9 in series. The second antenna circuit inhibits and damps FM-band signals in a plurality of steps. In the third antenna circuit for AM/FM broadcasting, the output signal of an antenna is divided into two parts and one part is supplied to an FM-band filter (12) through a serial FM resonance circuit (30) composed of capacitors and coils. The other part of the output signal is supplied to an AM-band filter (34).

摘要翻译： 改善强电场中振幅特性恶化的天线电路，用于AM广播的天线电路，其能够可靠地抑制和抑制强电场中的FM频带信号并放大以输出AM频带信号;以及天线 AM / FM广播的电路，其中AM波段信号不通过FM波段滤波器衰减。 在第一天线电路中，天线（10）的输出信号被提供给形成具有高输入和低输出阻抗的电流放大型放大器的晶体管Tr2的基极，晶体管Tr2的发射极通过 线圈L6，并通过带通滤波器（38）连接到FM接收器（16）。 在用于接收AM广播的第二天线电路中，输入端子通过串联的线圈（L7）和L8以及场效应晶体管FET的栅极G连接到AM放大器电路（36）。 晶体管FET的源极S接地，并且线圈L7和L8的连接点通过电容器C15和线圈L9串联接地。 第二天线电路在多个步骤中抑制和抑制FM频带信号。 在用于AM / FM广播的第三天线电路中，天线的输出信号被分成两部分，一部分通过由电容器和线圈组成的串行FM谐振电路（30）提供给FM带滤波器（12） 。 输出信号的另一部分被提供给AM带滤波器（34）。