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Theoretical Analysis and Modeling for PCB Embedded Tunable Filter with Inductive Coupling
Tae C. Lee(이태창),Jae Y. Park(박재영) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Fully embedded tunable bandpass filter (BPF) with inductive coupling circuits is newly designed and demonstrated for UHF TV tuner ranged from 500㎒ to 900㎒ receivers. Conventional RF tuning circuit with an electromagnetic coupled tunable filter has several problems such as large size, high volume, and high cost, since the electromagnetic coupled filter is comprised of several passive components and air coreinductors to be assembled and controlled manually. To address these obstacles, compact tunable filter with inductive coupling circuit was embedded into low cost organic package substrate. The embedded filter was optimally designed to have high performance by using high Q spiral stacked inductors, high dielectric BaTiO₃ composite MIM capacitors, varactor diodes. It exhibited low insertion loss of approximately -2㏈, high return loss of below -10㏈, and large tuning range of 56.3%. It has an extremely compact size of 3.4 × 4.4 × 0.5㎣.
UHF대역 TV 튜너에 적용을 위한 가변형 대역통과필터
李泰昌(Tae C. Lee),朴宰永(Jae Y. Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
In this paper, a tunable bandpass filter with mutual inductive coupling circuits is newly designed and demonstrated for UHF TV tuner ranged from Ch.14(473㎒) to Ch.69(803㎒) applications. Conventional RF tuning circuit with an electromagnetic bandpass filter has several problems such as large size, high volume and high cost, since the electromagnetic filter is comprised of several passive components and air core inductors to be assembled and controlled manually. To address these obstacles, peaking chip inductor was newly applied for constructing the mutual inductive coupling circuit. The proposed circuit was newly and optimally designed, since the chip inductor showed lower components Q-value than the air core inductor. A varactor diode has been also used to fabricate the proposed tunable bandpass filter for RF tuning circuit. The fabricated tunable filter exhibited low insertion loss of approximately -3㏈, high return loss of below -10㏈, and large tuning bandwidth of 330㎒.