Title:
BALANCED RADIO FREQUENCY ELECTRICALLY TUNABLE BAND-PASS FILTER WITH CONSTANT ABSOLUTE BANDWIDTH
Document Type and Number:
WIPO Patent Application WO/2012/162972
Kind Code:
A1
Abstract:
Disclosed in the present invention is a balanced radio frequency electrically tunable band-pass filter with constant absolute bandwidth. The band-pass filter comprises a micro strip structure at an upper layer, a medium substrate at a middle layer and grounding metal at a lower layer. The micro strip structure at the upper layer adopts a balanced circuit and comprises four half-wavelength resonators, two input feed networks, two output feed networks, two input ports and two output ports; each of the four half-wavelength resonators comprises a micro strip and a variable capacitance diode with two connected ends; capacitors are loaded at the middles of the first half-wavelength resonator and the third half-wavelength resonator; the second half-wavelength resonator and the fourth half-wavelength resonator are bent and arranged symmetrically; and the whole filter structure is in mirror symmetry. The balanced radio frequency electrically tunable band-pass 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.
Inventors:
ZHANG XIUYIN (CN)
HU BINJIE (CN)
LI YUANCHUN (CN)
HUANG XUN (CN)
HU BINJIE (CN)
LI YUANCHUN (CN)
HUANG XUN (CN)
Application Number:
PCT/CN2011/079300
Publication Date:
December 06, 2012
Filing Date:
September 02, 2011
Export Citation:
Assignee:
UNIV SOUTH CHINA TECH (CN)
ZHANG XIUYIN (CN)
HU BINJIE (CN)
LI YUANCHUN (CN)
HUANG XUN (CN)
ZHANG XIUYIN (CN)
HU BINJIE (CN)
LI YUANCHUN (CN)
HUANG XUN (CN)
International Classes:
H01P1/203; H01P7/08
Foreign References:
CN101894995A | 2010-11-24 | |||
CN101740842A | 2010-06-16 |
Attorney, Agent or Firm:
YOGO PATENT & TRADEMARK AGENCY LIMITED COMPANY (CN)
广州粤高专利商标代理有限公司 (CN)
广州粤高专利商标代理有限公司 (CN)
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Claims: