A Dual Band Coupled-line Balanced-to-unbalanced Bandpass Filter
A new type of device called dual band coupled-line balanced-to-unbalanced band pass filter, or simply dual band balun-filter, is proposed. Based on the traditional coupled-line filter theory and Marchand balun configuration, a new device with both filter-type as well as balun-type characteristics is designed. In addition, it utilizes λ/4-type transmission-line stepped-impedance resonators (SIR’s) to achieve a dual band operation. Besides providing a simple design procedure for the device, its working mechanism is also revealed mathematically. A prototype balun-filter operating at 2.4-GHz and 5.8-GHz has been realized to validate the proposed concept and theory, showing promising application potentials for future multi-band radio-frequency (RF) wireless transceiver modules.
Patent Number: US7541888B2
Application Number: US2007690393A
Inventor: Wu, Ke-Li | Yeung, Lap Kun
Priority Date: 23 Mar 2007
Priority Number: US7541888B2
Application Date: 23 Mar 2007
Publication Date: 2 Jun 2009
IPC Current: H03H000742 | H01P000308 | H03H000738
US Class: 333026 | 333033 | 333204
Assignee Applicant: The Chinese University of Hong Kong
Title: Dual band coupled-line balanced-to-unbalanced bandpass filter
Usefulness: Dual band coupled-line balanced-to-unbalanced bandpass filter
Summary: Dual band balun filter for use in a transceiver (claimed) e.g. radio-frequency (RF) transceiver and wireless local area network transceiver, of a dual band wireless system.
Novelty: Dual band balun filter for use in e.g. wireless local area network transceiver, has coupled-line section pair provided with transmission line and connected to another coupled-line section pair that is provided with terminal
电子
电路设计
06/ENG/236
Inventor(s): Professor WU Keli, Department of Electronic Engineering
Patent Status: US Patent 7,541,888
Licensing Status: Available for licensing
香港
