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Investigation of a Bluetooth Module Integrated with an Embedded Antenna
Jongin Ryu,Dongsu Kim,Junchul Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper presents a Bluetooth module integrated with an embedded antenna based on low temperature co-fired ceramic (LTCC) technology. By removing chip components such as inductors and capacitors for a matching circuit, a compact module can be realized with high performance. The overall size of the antenna itself is less than 3.4 ㎜ × 6.3 ㎜ with a substrate thickness of 0.8 ㎜. The propoesed antenna provides that the resonant frequency is 2. 48 ㎓ with a bandwidth of 53 ㎒ for VSWR < 2. Furthermore, the effect of PCB size and feeding line of the antenna are described as well.
그라운드 모드의 공진을 이용한 광대역 격리도를 가지는 스마트 안경용 소형 MIMO 안테나
유종인(Jongin Ryu),김형동(Hyeongdong Kim) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.10
본 논문에서는 스마트 안경에서 사용가능한 2.4 GHz 무선 근거리 통신망(WLAN) 대역용 소형 다중 입력 다중 출력(MIMO) 안테나 설계 및 구현에 대한 제안을 하였다. MIMO 안테나 시스템을 소형화하기 위해서, 안테나의 그라운드면을 방사체로서 사용하였으며, T 자형의 접지면을 제안하고 있다. 광대역 격리를 특성을 확보하기 위해, 이중 공진이 그라운드 모드에서 형성되도록 한다. 하나의 공진은 T 자형 접지에 의해 생성되고, 두 번째 공진은 두 개의 급전선 사이에 슬롯과 커패시터를 추가하여 만들어진다. 구현된 안테나의 측정 결과, 반사 계수 특성은 -5.1 dB보다 작지만, 얻는 격리 특성은 −20 dB 미만이다. 다이버시티 성능은 측정된 2차원 방사 패턴을 사용하여 평가하였고, 목표 대역(2.4~2.5 GHz)에서 측정된 ECC(envelope correlation coefficients) 값은 0.1 미만이다. In this letter, a compact multiple-input multiple-output(MIMO) antenna design for a 2.4 GHz wireless local area network(WLAN) band is proposed for use in smart glasses. To miniaturize the MIMO antenna system, a ground plane is employed within the antenna and a T-shaped ground is proposed. To achieve wideband isolation, dual resonance is formed by the ground mode. One resonance is created by the T-shaped ground and the second resonance is created by adding a slot and a capacitor between the two feed lines. The measurements show that the reflection coefficient characteristic was less than -5.1 dB, whereas the isolation obtained was less than -20 dB. The diversity performance was evaluated using the measured two-dimensional radiation patterns, and the envelope correlation coefficient(ECC) values achieved in the target band(2.4~2.5 GHz) were less than 0.1.
LTCC 공정을 이용한 제한된 크기에서의 Band pass filter 설계 및 구현
서덕진(Deokjin Seo),유종인(Jongin Ryu) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문에서는 Low-Temperature Co-fired Ceramics (LTCC) 공정을 이용하여 Band Pass Filter (BPF) 설계 및 구현하였다. 필터의 목표 Spec으로는 Center frequency가 5.4 GHz, Bandwidth는 Center frequency로부터 Fc ± 0.5GHz를 갖고 Bandwidth내 Insertion loss가 2 dB이하, Return loss가 10 dB이상을 가지며, 4 GHz에서 감쇠가 23 dB를 만족하도록 하였다. 필터의 크기는 3.5 x 3.5 x 0.6 mm로 설계 하였다. LTCC 공정을 통해 구현된 필터를 VNA를 이용하여 성능을 측정하였으며, 목표 했던 Spec와 비교한 결과 만족함을 확인하였다.
Compact 28 GHz Folded Butler Matrix Using Low-Temperature Co-fired Ceramics
Nam Seunggoo,최세환,Ryu Jongin,이재영 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.4
This paper introduces a miniaturized Butler matrix design method using a folded structure. The Butler matrix was fabricated in multilayers using low-temperature co-fired ceramics (LTCC) and designed to operate at 28 GHz. The conventional one-plane Butler matrix has a major disadvantage in that the length and volume of the system inevitably have to be increased. By using the proposed folded structure, the length can be reduced more than two times compared to the general one-layer Butler matrix. In order to minimize the loss of the Butler matrix, it was designed in a stripline structure by forming a ground plane on the upper and lower surfaces of each layer. A signal is transmitted between the layers through via holes. A 4 × 4 Butler matrix was fabricated and measured for the demonstration of the proposed concept. The proposed Butler matrix was measured through a precisely calibrated antenna chamber with closed cell absorbers. The dimensions of the fabricated Butler matrix are 14 mm × 20 mm × 1.52 mm. The beam of the fabricated Butler matrix can be properly steered in a total of four directions.