• Title/Summary/Keyword: Waveguide Antenna

Search Result 297, Processing Time 0.027 seconds

Analysis and Design of the Spirally Slotted Array Antenna (나선형 슬랏배열 안테나의 특성해석 및 설계)

  • 민이규;양두영;이상설
    • Journal of the Korean Institute of Telematics and Electronics A
    • /
    • v.28A no.10
    • /
    • pp.799-805
    • /
    • 1991
  • In this paper, the analysis and design of a spirally slotted array antenna with high efficiency are presented. Electric fields in the slots are calculated by electromagnetic fields in the upper waveguide and radiation field equations are derived. Slots are arrayed spirally on the upper circular plate of twofold radial waveguide. In order to suppress grating lobes from the array, a slow wave structure is inserted in the upper waveguide. This antenna is characterized by a good circular polarization, high efficiency of 75 percent and grating lobes below -34dB.

  • PDF

Waveguide Slot Array Antenna for Heliborne MTD Radar (헬리콥터 탑재 MTD 레이다용 도파관 슬롯배열 안테나)

  • Kim Dong-Seok;Han In-Hee;Gwak Young-Gil;Shin Keun-Sup
    • Proceedings of the IEEK Conference
    • /
    • 2004.06a
    • /
    • pp.139-142
    • /
    • 2004
  • X-band Waveguide slot way antenna is developed for heliborne MTD radar applications. The antenna is composed of multi-layer waveguide structures. Each of them has it's own functions, such as, radiation, power/phase distribution, coupling, etc. Broad-wall offset slots are used for radiators, inclined slots on broad-wall for power distribution to radiating(branch) waveguide, some kind of coaxial probe structures for in-phase coupling and H-plane T-junction power dividers. Antenna is realized by precision machining and careful assembly. It is tested and measured by 3m${\times}$l.7m planar near-field probe, which is set-up in MTG. Far-field calculations have good agreement in tolerable bounds. Special but necessary process such as brazing, will increase the accuracy and performance. Results show promising possibilities of future applications for real systems.

  • PDF

Leaky wave antenna analysis design, and implementation (누설파 안테나 해석 설계 및 제작)

  • 홍재표;조웅희;이종익;윤리호;이정형;조영기;엄효준
    • Journal of the Korean Institute of Telematics and Electronics A
    • /
    • v.33A no.11
    • /
    • pp.88-96
    • /
    • 1996
  • Periodically slotted dielectricalloy filled parallel-plate waveguide as a leaky wave antenna is designed and fabricated at the center frequency of 10.0GHz. The antenna was fed by use of a hog-horn structure. The hog-horn and the two side walls and the lower plate of parallel-plate waveguide were fabricated form duralumin. The upper plate of parallel-plate waveguide with 48 periodic slots was made of copper plate of 1mm thickness. The dielectric material inside the parallel-plate waveguide was chosen to be paraffin. The experimental radiation pattern for the fbricated antenna was compared with the theoretical results for the finite periodic structure.

  • PDF

Open-Ended Waveguide Antenna Using a Single Split-Ring Resonator

  • Ju, Young-Rim;Oh, Soon-Soo;Park, Wook-Ki;Park, Hyo-Dal
    • ETRI Journal
    • /
    • v.33 no.2
    • /
    • pp.291-294
    • /
    • 2011
  • This letter proposes an open-ended waveguide antenna with a single split-ring resonator. In contrast to the waveguide antennas incorporating multiple rings reported in a previous study, which exhibited narrow bandwidth, the proposed antenna uses only one ring to achieve broader bandwidth while keeping the aperture small. A single ring has a relatively low quality factor compared to multiple rings. The simulated and measured fractional bandwidth was 4.13% and 4.03%, respectively, which is much broader than the fractional bandwidth of about 1% demonstrated in a previous study. This simple technique can be used in many applications that require small apertures including near-field probes and array elements.

Design of a Rectangular Waveguide Antenna for Automotive Side and Rear Radar Sensor Applications (차량 측후방 레이더 센서용 직사각형 도파관 안테나 설계)

  • Lee, Jae-Min;Ryu, Hong-Kyun;Woo, Jong-Myung;Koo, Bon-Hee
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.11 no.1
    • /
    • pp.42-52
    • /
    • 2012
  • In this paper, a waveguide antenna is designed and fabricated for side and rear radar sensor of vehicles in UWB (Ultra Wide Band) high band (center frequency : 9.5 GHz, -10 dB bandwidth : 600 MHz (6.4 %)). For the radar antenna, a probe fed rectangular waveguide antenna having simple structure and wide bandwidth is used. An important performance factor in this antenna is the isolation between transmitting (TX) and receiving (RX) waveguide antennas because this radar system uses TX and RX antennas separately. Thus the isolation between two antennas was simulated for E-plane and H-plane array. As a result, it was verified that the isolation of the H-plane array of the antennas is better than E-plane array, due to the TE10 mode. Therefore, H-plane arrayed waveguide antennas were mounted on a T-shaped radar module and performance of antennas was investigated. The -10 dB bandwidth of the TX and RX antenna mounted on T-shaped radar module was measured as 1000 MHz (10.52 %) and 1090 MHz (11.47 %) respectively and the isolation is less than -50 dB in the operation band. The peak gain is 7.65 dBi for the TX antenna and 7.26 dBi for the RX antenna and the beamwidth of H-plane of TX and RX antenna was measured as $64^{\circ}$ and $65^{\circ}$ respectively. Consequently, we verified that the proposed waveguide antenna is appropriate for a vehicle radar applications.

Analysis of cross slotted waveguide antenna using Spatial Network Method (공간회로망법을 이용한 크로스 슬롯 도파관 안테나 해석)

  • Park, Kyoung-Su;Choi, Sung-Youl;Kim, Jin;Lee, Hee-Bock;Ko, Young-Ho
    • Proceedings of the IEEK Conference
    • /
    • 2000.11a
    • /
    • pp.493-496
    • /
    • 2000
  • This paper presents a slotted leaky waveguide antenna using a rectangular waveguide for mobile reception of DBS (Direct Broadcasting Satellite). A slotted rectangular waveguide in leaky-wave operation can obtain a large beam-tilting angle of 45$^{\circ}$, which is an attractive candidate of mobile DBS receiving antennas because it can be installed horizontally. SNM is used to solve arbitrary shape and materials constant, derived from maxwell's equations. In this paper, analyze cross slot waveguide antenna using SNM. and verify by HFSS.

  • PDF

Design of An X-Band Traveling-Wave Slot Array (X-대역 진행파 슬롯 배열 안테나 설계)

  • 유상길;이석곤;최재현;안병철
    • Proceedings of the IEEK Conference
    • /
    • 2002.06a
    • /
    • pp.455-458
    • /
    • 2002
  • Design methods are presented for an X-band traveling-wave slot array realized on a rectangular waveguide. An array of 21 longitudinal slots is realized on the broad wall of a rectangular waveguide. The squint of the antenna main beam is adjusted using the element spacing and the waveguide broad wall dimension. The excitation of the array is controlled by the slot offset from the waveguide center line Multiple I-plane steps are placed around last slot elements so that the second-order beam due to tile reflected wave Is minimized A waveguide-to-coaxial adapter Is designed for feeding the array antenna from a coaxial system. Results of the design show an outstanding performance of the antenna 17.1 dB gain. 36"beam 1111, and -21 dB maximum sidelobe level.evel.

  • PDF

Design of rectangular microstrip patch antenna for receiving a microwave power propagating in a rectangular waveguide (직사각형 도파관 속으로 전파하는 초고주파 전력 수신용 사각형 마이크로스트립 패치 안테나 설계)

  • 박동국
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.1 no.2
    • /
    • pp.131-136
    • /
    • 1997
  • In this paper, the input impedance of coaxial fed rectangular microstrip patch antenna located inside rectangular waveguide is calculated by using the cavity model and the mode excited in the waveguide by the patch antenna. The return loss and efficiency of the patch antennas as a function of feed position in. free space and in waveguide are calculated and compared. The maximum efficiency of the antennas in waveguide and in free space are obtained at different feed position.

  • PDF

Design of an Equivalent Antenna Model for Array Antennas Using Open-Ended Waveguide (열린 도파관을 이용한 배열안테나의 전자파 해석 등가 모델링 기법)

  • Lee, Dongeun;Byun, Gangil;Choo, Hosung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.26 no.6
    • /
    • pp.525-532
    • /
    • 2015
  • In this paper, we propose an equivalent model of array antennas that use open-ended waveguides for effective EM simulation. We first investigate an individual element that consists of an open-ended waveguide and square ground plane. The waveguide length, aperture size, and ground size of the individual element are adjusted to give a similar radiation pattern to that of the individual element of the original antenna. We then apply the designed equivalent model to two different types of array antennas, such as a microstrip patch array and a waveguide array antenna. Comparison of the simulation results using the equivalent model with the results obtained with the original antenna reveals a difference in gain of less than 0.2 dB and a difference in half power beam width(HPBW) of less than $1^{\circ}$. The designed equivalent model is then mounted on a simple aircraft, and the simulation results are again compared to results from the original antenna. We find a 60 % reduction in simulation resources and time when compared with the original antenna model.

Design of the Non-Resonant SWG Antenna with Double Slots in the Narrow Wall of Rectangular Waveguide (구형 도파관의 협벽에 이중 슬롯을 가진 비공진형 슬롯 도파관 안테나의 설계)

  • Hur, Moon-Man
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.22 no.1
    • /
    • pp.106-113
    • /
    • 2011
  • In this paper, the non-resonant SWG(Slotted Waveguide) antenna with double slots in narrow wall of rectangular waveguide is designed. Because energy radiated from each slot depends upon inclination angle of slot of the designed antenna, inclination angle of each slot is controlled to satisfy the amplitude distribution for required sidelobe level. Instead of the conventional extraction method of slot conductance, this amplitude distribution is made by the proposed method, which employs far-field radiation pattern calculated by Fourier transform of aperture field distribution on slot. The non-resonant double SWG antenna is designed by the proposed method and is manufactured. The antenna performances are measured and compared with the simulated results.