High-frequency filter and transmitting/receiving antenna shared filter

A technology for high-frequency filtering and receiving antennas, applied in waveguide devices, automatic frequency control, impedance networks, etc., can solve problems such as deterioration of high-frequency characteristics, inability to obtain practical characteristics, and large occupied area of ​​wireless parts

Inactive Publication Date: 2002-12-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to miniaturize the filter device, if the resonant element is miniaturized, the high-frequency characteristics will deteriorate, and practical characteristics cannot be obtained.
[0014] Moreo

Method used

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  • High-frequency filter and transmitting/receiving antenna shared filter
  • High-frequency filter and transmitting/receiving antenna shared filter
  • High-frequency filter and transmitting/receiving antenna shared filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The high-frequency filtering device of the present embodiment is: a voltage-controlled frequency variable resonant element composed of a resonant element and a voltage-controlled impedance variable element connected in parallel with the resonant element is formed, and according to information from a radio device, the signal is monitored. The control unit controls the voltage applied to the impedance variable element to control the frequency band of the filter.

[0053] The signal monitoring part adaptively generates a control signal according to the oscillation frequency information of the local oscillator of the radio device carrying the filter device, and the control part sends a control voltage signal to the resonator according to the control signal, adapting to the frequency characteristic of the filter variable control. That is, the frequency characteristic of the filter is adaptively and variably controlled according to the operating state of the radio device.

...

Embodiment 2

[0108] The filter device for transmitting and receiving antennas of this embodiment includes two high-frequency filter devices. The first filter device, that is, the filter device for reception, has a first passband and a first stopband. The second filter device, that is, the filter device for reception, has a second passband and a second stopband. By controlling, the first passband and the second stopband are approximately coincident, and the first stopband and the second passband are approximately coincident, and by controlling, the first passband and the first stopband frequencies are set at a constant frequency. The frequency interval changes synchronously and is controlled so that the frequencies of the second pass band and the second stop band also change synchronously at a certain frequency interval.

[0109] In this embodiment, regarding the first filter device for signal reception, the signal monitoring part monitors the interference signal of the signal received by ...

Embodiment 3

[0122] In the filter device of this embodiment, the variable frequency resonator is composed of a stripline resonator provided on a ceramic substrate and a voltage control varactor formed on the ceramic substrate.

[0123] The filter device of this embodiment is applicable to more than one control integrated circuit including one or more adaptive high-frequency filters and a control part on a ceramic substrate, and the adaptive high-frequency filter is controlled by the control integrated circuit. A small and high-performance high-frequency device can be realized.

[0124] In particular, an antenna may be further included on the ceramic substrate, and a filter device for transmitting and receiving antennas may be constituted. Such a filtering device can be used in a radio communication device capable of simultaneous two-way communication that shares an antenna for transmission and reception, especially for a mobile phone.

[0125] Here, a ceramic laminate is used as the ceram...

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PUM

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Abstract

A high-frequency filter device, including at least one filter that should be connected to a high-frequency band of a radio device, where the filter includes: a voltage-controlled variable impedance element composed of a resonant element and a voltage-controlled impedance variable element electrically connected to the resonant element. A variable frequency resonant element; the high-frequency filtering device includes: a control unit that controls the voltage applied to the variable impedance element; according to the frequency data of the oscillation frequency of the local oscillator of the radio device, control the The voltage control signal is output to the signal monitoring part of the control part; the signal monitoring part controls according to the frequency data, so that the frequency band of the at least one filter can be adaptively changed. The resonant element is a distributed constant type strip line resonator formed in the laminated medium; the impedance variable element is a variable capacitance circuit including a variable capacitance diode; and the variable capacitance diode is installed on the surface of the laminated medium.

Description

technical field [0001] The present invention relates to an adaptive high-frequency filter device and an adaptive high-frequency transmitting and receiving antenna sharing filter device mainly used in the high-frequency part of radio devices such as mobile phones, and a radio device using these devices. Background technique [0002] In recent years, in simultaneous two-way radio communication devices such as mobile phones and car phones in network radio communication systems, a filter is installed between the transceiver and the antenna. In this radio communication system, the usable frequency band is allocated to a signal transmission frequency band and a signal reception frequency band, and the filter means has a filter means that allows the frequency band of the received signal to pass on the receiver side and enables the transmission signal to be transmitted on the transmitter side. The filter device that passes the frequency band. In recent years, a frequency shifting t...

Claims

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Application Information

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IPC IPC(8): H01P1/205H01P1/203H01P1/212H01P1/213H01P7/10H03H7/12H03H7/46
CPCH01P1/2135H01P1/2136H01P7/10
Inventor 石崎俊雄山田彻
Owner PANASONIC CORP
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