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아리온밧볼드(Ariun Batbold),오던토이아 바산체렌(Odontuya Baasantseren),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn),임태욱(Tae-Wook Lim) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.2
This paper describes the design of an X-band dielectric resonator oscillator(DRO) based on a pseudomorphic high electron mobility transistor(pHEMT). DRO’s are widely used as a local oscillator for their high stability. In this paper, we realized a DRO employing a pHEMP with high efficiency and stable output, a series-coupled dielectric resonator, input and output matching circuits, a frequency-tuning plate, and a metallic cavity. The transistor’s instability is increased by adding a capacitive impedance at the source of the pHEMT. Starting from the initial design based on the oscillators small signal model, an optimum design of the oscillator is obtained using a CAD tool. The designed oscillator is fabricated and tested. The fabricated oscillator shows a stable oscillation with 1.5-4.5㏈m output at 10.5-10.9㎓.
대칭적 수직 방사패턴을 가지는 ZigBee용 인쇄형 미앤더 모노폴 안테나 설계
민동현(DongHyeon Min),오던토이아 바산체렌(Baasantseren Odontuya),방재훈(JaeHoon Bang),안병철(BierngChearl Ahn) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.5
This paper presents a printed meander monopole antenna with a symmetric vertical radiation pattern for ZigBee applications. Short-range wireless communications often require antennas with radiation patterns omnidirectional in the horizontal plane and symmetric in the vertical direction. In general, printed monopoles have an asymmetric vertical pattern due to the imbalance between the radiating element and the ground plane. In this paper, we presented a printed monopole antenna with an omnidirectional horizontal pattern and a symmetric vertical pattern for 2.4㎓ ZigBee communication. A meander monopole radiator is employed for antenna size reduction. An omnidirectional horizontal pattern is obtained by placing the monopole at the center of the ground plane, while a symmetric vertical pattern is realized by adjusting the ground plane size. Measurements show that the proposed antenna has favorable characteristics such as a 2.98㏈i gain, a 560㎒ bandwidth, an omnidirectional horizontal pattern, and a symmetric vertical pattern with a 82.5° beamwidth.