Balanced RF Electrically Tunable Bandpass Filter with Constant Relative Bandwidth

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

Active Publication Date: 2011-12-14
深圳锦峰信息技术有限公司
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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
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Method used

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  • Balanced RF Electrically Tunable Bandpass Filter with Constant Relative Bandwidth
  • Balanced RF Electrically Tunable Bandpass Filter with Constant Relative Bandwidth
  • Balanced RF Electrically Tunable Bandpass Filter with Constant Relative Bandwidth

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Embodiment Construction

[0033] specific implementation plan

[0034] 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.

[0035] Such as figure 1 As shown, the balanced radio frequency electronically tuned bandpass filter FBW with constant relative bandwidth includes the upper microstrip structure, the middle layer dielectric substrate and the lower ground metal; the upper layer microstrip structure is attached to the upper surface of the middle layer dielectric board, and the middle layer The lower surface of the dielectric plate 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 the two input ports are respectively connected to The two input feed networks are connected, the two output ports a...

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Abstract

The invention discloses a balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth. The bandpass filter consists of an upper-layer microstrip structure, a middle-layer dielectric substrate, and a lower-layer grounded metal. The upper-layer microstrip structure is a balanced circuit, and comprises four half-wavelength resonators, two input feed networks, two output feed networks, two input ports and two output ports; the four half-wavelength resonators respectively consist of microstrip lines and variable capacitance diodes connected at two ends; the middle of the first half-wavelength resonator is connected with a capacitor and a microstrip line; the middle of the third half-wavelength resonator is connected with a capacitor; the second and fourth half-wavelength resonators are bent and symmetrical vertically; and the whole filter structure is in vertical mirror symmetry. The balanced radio frequency electrically tunable bandpass filter realizes constant relative bandwidth when a center frequency is tuned, can inhibit common-mode interference and can be used for a reconfigurable radio frequency front end for wireless communication.

Description

technical field [0001] The invention relates to a balanced radio frequency electronically adjustable band-pass filter with adjustable center frequency, in particular to a balanced radio frequency electronically adjustable bandpass filter with constant relative bandwidth that can be applied in multi-band, wide-band 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...

Claims

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Application Information

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IPC IPC(8): H01P1/203H01P7/08
Inventor 章秀银胡斌杰李园春黄勋
Owner 深圳锦峰信息技术有限公司
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