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Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth

A band-pass filter and balanced technology, applied in waveguide devices, circuits, resonators, etc., can solve problems such as environmental noise interference around the system, achieve good suppression, suppress common-mode interference signals, relative bandwidth or absolute The effect of constant bandwidth

Inactive Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (2) Interference from environmental noise around the system
So far there is no research report on balanced RF electronically tunable filters with absolute bandwidth control and common-mode rejection characteristics

Method used

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  • Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth
  • Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth
  • Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth

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Embodiment Construction

[0030] specific implementation plan

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings, but the scope of protection claimed by the present invention is not limited to the scope of the following examples.

[0032] Such as figure 1 As shown, the balanced radio frequency electronically tuned bandpass filter with constant absolute bandwidth is characterized in that it includes an upper microstrip structure, an intermediate dielectric substrate and a lower ground metal; the upper microstrip structure is attached to the upper surface of the intermediate dielectric plate , the lower surface of the intermediate dielectric board is grounded metal; the upper microstrip structure includes four half-wavelength resonators, two input feed networks, two output feed networks, two input ports and two output ports, and two input The ports are respectively connected to two input feed networks, and the two output ports are resp...

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Abstract

The invention discloses a balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth. The bandpass filter comprises a micro-band structure at an upper layer, a medium substrate at a middle layer and grounding metal at a lower layer. The micro-band structure at the upper layer adopts a balanced circuit and comprises four semi-wavelength resonators, two input feed networks, two output feed networks, two input ports and two output ports; each of the four semi-wavelength resonators comprises a micro-band line and a variable capacitance diode with two connected ends; capacitors are loaded at the middles of the first semi-wavelength resonator and the third semi-wavelength resonator; the second semi-wavelength resonator and the fourth semi-wavelength resonator are bent and arranged symmetrically; and the whole filter structure is in mirror symmetry. The balanced type radio frequency voltage tunable bandpass filter provided by the invention realizes constant absolute bandwidth during centre frequency tuning and can restrain common mode interference and can be used for a reconstructed radio frequency front end of wireless communication.

Description

technical field [0001] The invention relates to a balanced radio frequency electronically adjustable bandpass filter with adjustable center frequency, in particular to a balanced radio frequency electronically adjustable bandpass filter with constant absolute bandwidth that can be applied in multi-band, wideband and reconfigurable radio frequency front-end systems pass filter. Background technique [0002] Modern ultra-wideband radar and wireless communications require high-performance reconfigurable RF front-ends. For example, in the cognitive radio system, in order to fully utilize and integrate various wireless channels and standards, the RF front-end needs to work at different frequencies, which requires a reconfigurable RF front-end with tunable center frequency. As an important part of the reconfigurable RF front-end, RF electronically tuned band-pass filters are receiving increasing attention. In this regard, there have been some research reports, and a variety of d...

Claims

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Application Information

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IPC IPC(8): H01P1/203H01P7/08
CPCH01P1/2039
Inventor 章秀银胡斌杰李园春黄勋
Owner SOUTH CHINA UNIV OF TECH
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