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권경훈(Kyunghoon Kwon),임종식(Jongsik Lim),정용채(Yongchae Jeong),안달(Dal Ahn) 대한전기학회 2013 전기학회논문지 Vol.62 No.5
A size-reduced high frequency mixer designed by adopting artificial dielectric substrate is described in this work. The artificial dielectric substrate is composed by stacking the lower substrate in which a lot of metalized via-holes exist, and upper substrate on which microstrip lines are realized. The effective dielectric constant increases due to the inserted lots of via-holes, and this may be applied to size-reduction of high frequency circuits. In this work, in order to present an application example of size-reduction for active high frequency circuits using the artificial dielectric substrate, a 8GHz single gate mixer is miniaturized and measured. It is described that the basic circuit elements for mixers such as hybrid, low pass filter, and matching networks can be replaced by the artificial dielectric substrate for size-reduction. The final mixer has 55% of size compared to the normal one. The measured average conversion gain is around 3dB which is almost similar result as the normal circuit.
가유전체 기판과 결함접지구조가 결합된 가지선로 하이브리드 커플러의 설계
권경훈(Kyunghoon Kwon),임종식(Jongsik Lim),정용채(Yongchae Jeong),한상민(Sang-Min Han),안달(Dal Ahn) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.11
A design of size-reduced branch line hybrid coupler(BLHC) with an artificial dielectric substrate(ADS) and defected ground structure(DGS) is described in this paper. The effective dielectric constant and equivalent capacitance per unit length increase on ADS structure. The equivalent inductance per unit length of DGS line increases due to its geometric patterns. So, ADS and DGS complementarily play a role of length-reduction of transmission line together with a critical change of the characteristic impedance. A size-reduced BLHC is designed, fabricated, and measured as an example by applying ADS and DGS to the normal circuit. The designed BLHC circuit is compared to the circuits with only ADS and DGS, and the reduction ratio are 68%, and 54%, respectively. The measured power dividing ratios and phase difference are -3.08dB, -3.87dB, and 93°, respectively. This means any critical degradation in performances is not observed even after the size-reduction by applying ADS and DGS.
양면형 가유전체 기판구조를 이용한 브랜치 라인 결합기의 설계
임종식(Jongsik Lim),권경훈(Kyunghoon Kwon),한상민(Sang-Min Han),안달(Dal Ahn),정용채(Yongchae Jeong) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.4
In this paper, the design of a branch line coupler using a double-sided artificial dielectric substrate (DSADS) structure is described. Lots of metalized via-holes in the artificial dielectric substrate (ADS) structure induce an additional equivalent capacitance and effective permittivity, which lead a length-reduction of the transmission line on ADS. Beside this effect, the ADS is folded for half size, and the transmission line is designed on this folded or double-sided ADS with the transmission characteristics preserved. In order to show an application example of the DSADS to wireless circuit design, this paper designs a microwave branch line coupler on the proposed DSADS. The designed coupler has the half size as compared to the case of single-sided ADS, while the electrical performances in matching, isolation, power division, and coupling are still preserved as an required level. The paper also provides the measured data.