• Title/Summary/Keyword: integrated antenna

Search Result 216, Processing Time 0.028 seconds

A Study on Wearable GPS Antenna Integrated into Garment (의복에 실장되는 웨어러블 GPS 안테나에 대한 연구)

  • Park, Dong-Kook
    • Journal of Navigation and Port Research
    • /
    • v.38 no.6
    • /
    • pp.623-627
    • /
    • 2014
  • In recent years, wireless communication technologies in human body have received an increasing attention and the research on an antenna that can be worn also has been actively conducted. In this paper, an wearable antenna that can receive GPS signal frequency is proposed. The antenna was manufactured by using a copper polyester fabric with thickness of 0.08mm as a radiator and a ground plate, and a goatskin with thickness of 0.7mm as dielectric substrate. Cutting edges placed in diagonal direction of square patch in order to obtain a circular polarization characteristic, and the conductive cloth and leather was laminated by using a conductive epoxy. First, goatskin dielectric constant was obtained through the simulation and measurement of resonance frequency of the three square patch antennas with different size. On the basis of the results, an antenna operating in the GPS band was designed and the performance of the antenna was validated by making the experiment. The change of the characteristic of the antenna that is located on the shoulder parts of the clothing and wearing person were measured. And it was confirmed that the reception sensitivity has a similar level as compared to the commercially produced ceramic GPS antenna.

Electrically Small Eighth-Mode Substrate-Integrated Waveguide(EMSIW) Antenna Loading Complementary Split Ring Resonator(CSRR) (상보적 분할 링 공진기를 이용한 전기적으로 작은 1/8 모드 기판 집적형 도파관 안테나)

  • Kang, Hyunseong;Sam, Somarith;Lim, Sungjoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.24 no.7
    • /
    • pp.686-693
    • /
    • 2013
  • Based on a substrate integrated waveguide(SIW) and a complementary split ring resonator(CSRR), electrically small antennas are proposed in this paper. Antenna's electrical size is reduced by introducing both CSRR and the eighth-mode substrate integrated waveguide(EMSIW). The EMSIW occupies only 12.5 % of the conventional SIW at the same dominant resonant frequency. In addition, the resonant frequency of the antenna is varied by rotating the CSRR on the EMSIW while keeping the same radiation patterns. The resonant frequency is changed from 4.74 GHz to 5.07 GHz by varying orientation of the CSRR from 0 to 360 degree. Unidirectional radiation patterns are observed and the measured peak gains are from 4.50 to 5.92 dBi.

Design of ISM-band Folded Dipole Active Integrated Antenna (ISM 대역용 접힌 다이폴 능동 집적 안테나의 설계)

  • 이재홍;서종수
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.26 no.11B
    • /
    • pp.1612-1619
    • /
    • 2001
  • This paper examines the design, implementation characteristics of a folded dipole active integrated antenna. Our goal was to minimize the physical size of RF circuit and its insertion loss, and to make the high frequency tuning easier by directly integrating the ISM(Industrial Scientific & Medical) band power amplifier and antenna. Non-linear model has been used for highly accurate simulation of the power amplifier. The maximum power level was found by using the Load pull method before an impedance matching was achieved. It is found that the total power-added efficiency(PAE) including the driving amplifier was 31.5% and that the transmit power was 13.7 dBm. We also found that the proposed scheme with the smaller antenna as compared with the existing dipole antenna has 23.7 dB total gain including the antenna gain. The suppression of the second harmonic signal to the fundamental signal with respect to the fundamental signal was found to be more than 30 dBc.

  • PDF

Analysis of Radiation Characteristics of Microstrip Patch Antennas Integrated with Mushroom-like EBG Structures (Mushroom 형태의 EBG 구조를 집적한 마이크로스트립 패치안테나의 방사 특성 해석)

  • Kwak, Eun-Hyuk;Kim, Tae-Young;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.46 no.8
    • /
    • pp.67-78
    • /
    • 2009
  • Radiation characteristics of microstrip patch antennas integrated with mushroom-like EBG structures in all directions and length direction on a substrate with the relative dielectric constant of 10 are systematically analyzed. As the substrate thickness increases, the effect of the surface wave on the input impedance and radiation pattern of a patch antenna increases. The effect of EBG structures on the input impedance of a patch antenna is negligible when the distances between EBG structures and the center of a patch antenna are 0.4 ${\gamma}_0$, 0.2 ${\gamma}_0$ and 0.1 ${\gamma}_0$ for the substrate thickness of 3.2 mm, 1.6 mm and 0.8 mm, respectively. The forward radiation is improved due to the suppression of surface wave when the periods of EBG structures integrated are larger than 2, 2, 3 periods for the substrate thickness of 3.2 mm, 1.6 mm and 0.8 mm, respectively. The effects of EBG structures on the radiation characteristics of a patch antenna integrated with EBG structures in all directions and length direction are similar.

Compact Active Integrated Antenna with Rectagular Ring Structure for UHF RFID Reader (UHF RFID Reader용 사각 환형 소형 능동 안테나)

  • Yun, Gi-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.18 no.3 s.118
    • /
    • pp.315-322
    • /
    • 2007
  • In this paper, active integrated antenna with left hand circular polarization(LHCP) for a transmitter of UHF RFID reader has been described. A novel rectangular ring patch as a radiator of the active antenna is proposed for easier impedance matching, smaller patch size, and LHCP characteristics. An amplification circuit is placed in the opening area of the radiator and is combined with it to work as oscillating circuit around 915 MHz. From the test results, impedance bandwidth of 29 MHz, 3 dB axial ratio bandwidth of 20 MHz, 3 dB beamwidth of 85 degree, and effective radiation power of 8.8 dBm have been obtained.

5.8GHz 25W Microwave Wireless Power Transmission System Development and Measurement (5.8GHz 25W 무선전력전송 시스템 개발 및 측정)

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
    • /
    • v.18 no.1
    • /
    • pp.21-24
    • /
    • 2019
  • In this paper, 5.8GHz 25W microwave wireless power transmission system was developed. The transmission system is composed of a signal generator, a 1W drive amplifier, a 25W power amplifier, and a circularly polarized transmission antenna. The receiving system was fabricated with an integrated receiver that combines a circularly polarized receiving antenna, a pass band filter, and an RF-DC converter. And a multi-integrated receiver had twelve parts, including an integrated receiver. Under the conditions, voltage and current were measured for the system at 5cm intervals from a minimum distance of 5cm to a maximum distance of 80cm. The power was calculated for the system. The results of the system are shown in tables and graphs. The power decreases with distance, but the power does not drop sharply due to a multi-integrated receiver.

Dual-Band Frequency Reconfigurable Small Eighth-Mode Substrate-Integrated Waveguide Antenna (이중 대역 주파수 가변 1/8차 소형 기판집적형 도파관 안테나)

  • Kang, Hyunseong;Lim, Sungjoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.25 no.1
    • /
    • pp.10-18
    • /
    • 2014
  • In this paper, we propose a new frequency reconfigurable dual-band antenna. By using an electronically compact eighth-mode substrate-integrated-waveguide(EMSIW) resonator, we have designed a compact antenna, which performs dual-band movement by additionally loading a complementary split ring resonator(CSRR) structure. The EMSIW and CSRR structures are designed to satisfy the bandwidths of 1.575 GHz(GPS) and 2.4 GHz(WLAN), respectively. We load the CSRR with a varactor diode to allow a narrow bandwidth and to enable the resonance frequency to continuously vary from 2.4 GHz to 2.5 GHz. Thus, we realize a channel selection function that is used in the WLAN standards. Irrespective of how a varactor diode moves, the EMSIW independently resonates so that the antenna maintains a fixed frequency of the GPS bandwidth even at different voltages. Consequently, as the DC bias voltage changes from 11.4 V to 30 V, the resonance frequency of the WLAN bandwidth continuously changes between 2.38 GHz and 2.5 GHz, when the DC bias voltage changes from 11.4 V to 30 V. We observe that the simulated and the measured S-parameter values and radiation patterns are in good agreement with each other.

Design of TX/RX broadband L-type circular polarization Antenna using LTCC at K/Kaband (LTCC 공정을 이용한 K/Ka 대역에서의 송수신 겸용 L 형태 원형편파 안테나)

  • Oh, Min-Seok;Cheon, Young-Min;Kim, Sung-Nam;Choi, Jae-Ick;Pyo, Cheol-Sig;Lee, Jong-Moon;Cheon, Chang-Yul
    • Proceedings of the KIEE Conference
    • /
    • 2004.07c
    • /
    • pp.2052-2054
    • /
    • 2004
  • The TX/RX broadband L-type circular polarization antenna using LTCC at K/Ka band has been presented. This antenna has been analyzed in compensation for LTCC with relative permittivity 5.2 and could have been integrated with RF component. As the measured 10dB impedance circular polarization bandwidth of the proposed antenna is 7%(20.8GHz${\sim}$22.2GHz) at the K band and 2.3%(30.9GHz to 31.6GHz) at the Ka band. Also the gain of the antenna is -0.7${\sim}$3.05dBi at the K band and -2.8${\sim}$1dBi at the Ka band. The purpose of the research is to design an efficient antenna structure for satellite communication at K/Ka band. the antenna should be used for both TX and RX frequency bands. The antenna will be mounted on LTCC(Low Temperature Co-fired Ceramic) so that it can be integrated with other RF circuits. This research is important because of the following reasons. 1) The frequency ranges of satellite communication tends to move up to higher frequency such as Ka band or milimeter wave band. 2) Design of antenna for smaller size, lighter weight and less loss is preferred by most RF engineers. 3) Antennas on LTCC enables to integrate the antenna with other RF circuits, and thus, one can reduce the size and loss of the RF system.

  • PDF

Design of Life-jacket Integrated Multiband Antenna for Rescuing Distressed People (조난자의 구조를 위한 구명조끼 장착 다중대역 안테나 설계)

  • Park, Yong-Jin;Yang, Gyu-Sik;Jung, Sung-Hun;Park, Dong-Kook
    • Journal of Navigation and Port Research
    • /
    • v.39 no.6
    • /
    • pp.473-478
    • /
    • 2015
  • In this paper, we suggest a flexible multiband antenna which can be equipped on an inflatable life-jacket. The antenna can send distress alert and location data of survivors to assist rescue operation when crew or people are in distress. The antenna operate in three frequency bands such as VHF-DSC band (156MHz), COSPAS-SARSAT band (406MHz) and GPS band (1,575MHz). The GPS band is implemented with a square ring-slot planar antenna, the COSPAS-SARSAT band and the VHF-DSC band antenna is implemented by monopole type. In order to give flexibility of substrate to be equipped on life-jacket, FR4-epoxy substrate of thickness 0.2mm is used to make antenna. The reflection coefficients of the fabricated antenna are -8.8dB, -20.4dB and -10.7dB at each bandwidth like VHF-DSC, COSPAS-SARSAT and GPS band, respectively, when people are wearing life-jacket integrated multiband antenna.