• Title/Summary/Keyword: Passive Intermodulation

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A Study on the Characteristic Analysis of Passive Intermodulation among Highpower Radiostations (고출력 무선국간의 수동 상호변조시 특성분석에 대한 연구)

  • Kim Yung-Duk;Jo Hak-Hyun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.1
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    • pp.176-179
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    • 2006
  • As spurious emission strength is normally measured at the antenna feeder, It is required that the measurement method on passive Intermodulation occurred on the latter part of antenna feeder be made. through the tests and the analyses of passive Intermodulation between radiostations of adjacent frequency bands, the possibility of occurrence of passive Intermodulation was testified in this study. The purpose of this study is to propose the measurement method of spurious emission strength in order to prevent the bad effect by passive Intermodulation.

A Study of Passive Intermodulation Distortion on RF Connectors (RF 커넥터의 Passive IMD에 관한 연구)

  • 조인귀;이재화;안승호;최상국;정명영;최태구
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.2
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    • pp.268-277
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    • 2000
  • Nowadays, the interference between neighbor basestations is getting higher as mobile communication services expand, then the increase of the interference causes IMD(Intermolulation Distortion) problems for not only active devices but also passive devices. In this paper, we have designed and assembled several adapters having variable plating thickness and materials to analyze PIMD(Passive Intermodulation Distortion) mechanisms for coaxial cables which is one of the representative passive RF devices. The measurement results of the assembled adapters show that IM level depends on conductivity of plating materials, plating thickness, device structure, aging effect and so on. Furthermore, we have obtained PIMD mechanisms and some control methods of PIMD from the results.

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An Improvement of Intermodulation Characteristic of Base Station in Multimedia CDMA Mobile Communication

  • Park, Jung-Jin;KIm, Seon-Mi;Choi, Dong-You;Ryu, Kwnag-Jin;Choi, Dong-Woo;Noh, Sun-Kuk;Park, Chang-Kyun
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1327-1330
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    • 2002
  • In this paper examines theoretical analysis of passive intermodulation and its methods of measurement and procedure. And based on the results of field measurement, it defines the reasons of passive intermodulation of base stations, suggests characteristics by device and methods of improvement to minimize the influence of a base station on passive intermodulation, and compares and analyzes the results of field measurement before and after the reasons are improved to secure the characteristics by device and the utility and adequacy of methods of improvement.

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Study on Passive Intermodulation Reduction for High Power RF-Filter (고 전력 RF-Filter의 수동혼변조 저감방안에 대한 연구)

  • Park, Chong-Chul;Lee, Kang-Hoon;Rhee, Young-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.3 no.4
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    • pp.282-288
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    • 2008
  • In this paper, the Passive Intermodulation Distortion(PIMD) of high power RF Filter is measured with filter inner coating materials and we suggest how to reduced the PIMD of RF filter coating methods. According to the standard measurement regulation by IEC, the Passive Intermodulation Distortion of Wibro relay high power filter are measured. We suggest the coating materials and coating methods of high power filter inner structure to reduce the PIMD generating by insert loss and worse flatness of filter delay in the design of Wibro high power filter efficiently.

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Effects of Vibration on Passive Intermodulation Distortion in Mobile Base Station Antennas (이동 통신 기지국 안테나의 수동 상호 변조 왜곡에 진동이 미치는 영향 분석 및 개선 방안)

  • Park, Jin-Sung;Jung, Soon-Young;Lee, Yong-Shik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.12
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    • pp.1394-1401
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    • 2008
  • This work investigates the effects of vibration on the passive intermodulation distortion characteristics of base station antennas for 800 MHz CDMA mobile communication systems. In general, base station antennas are located at high positions such as on building rooftops or iron towers. Thus the antennas are always affected by random vibrations, coming from various natural environmental factors such as rain and wind, or from living environmental factors such as vehicles and trains passing by. The measured intermodulation distortion characteristics before and after vibration accelerated degradation test show that vibrations are indeed the main cause for the intermodulation distortion performances of such antennas. To minimize the effects of vibrations, a new antenna design isptoposed that has an improved tolerance for vibrations. Experimental results show that the proposed antenna design dramatically reduces the degradation of the intermodulation distortion more than 35 dB.

Analysis of Passive Intermodulation Distortion of Ku-Band Payload System for Communication & Broadcasting Satellite (통신방송위성 Ku 대역 탑재체 수동 상호혼변조왜곡 분석)

  • 이용민;김현국;정태진;이성팔;박계영
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.355-358
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    • 2002
  • This paper describe the passive intermodulation products(PIMs) which are formed in high power Ku-band transponder and antenna subsystem on the Communication St Broadcasting Satellite(CBS)program when two transmit carriers beat together to generate harmonics that fall into the receive band. How the PIMs are initially generated and the effect of PIMs for Ku-Band payload system are analyzed by calculating the PIMs frequencies and the power level of PIMs.

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A Study on the Antenna PIM Measurement in Anechoic Chamber (전자파무반사실에서의 안테나 PIM 측정에 관한 연구)

  • 김진태;조인귀;정명영;최태구
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1167-1174
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    • 2001
  • Antenna PIM(Passive Intermodulation) level measurement results are rarely credited due to the external signal receiving characteristics of antenna, and seriously affected by the external PIM sources such as anechoic chamber absorber and antenna tower. In this paper, antenna PIM model for the Reflect PIM measurement method is presented. Through the null point phenomena of the PIM level obtained by antenna PIM model simulations and experimental results, we concluded that antenna PIM level measurements are greatly affected by the PIM level generated on the anechoic chamber absorber and the path differences of PIM signal reflected to the antenna.

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The Measurement of Passive Intermodulation Distortion in Anten (Antenna의 Passive IMD 측정)

  • 조인귀;정명영;최태구
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.337-340
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    • 2000
  • 본 논문에서는 안테나의 PIMD 측정에 있어 신뢰성과 재현성에 관한 문제점을 검토하였으며, 향후 새로운 구조의 Anechoic Chamber의 필요성에 관해 기술하였다. 패치 안테나를 일반적인 안테나용 Chamber에서 PIMD를 측정한 결과 재현성에 있어 문제점이 있음을 확인하였으며, 그 원인이 피라미드 구조의 흡수체에 있음을 실험을 통해 확인하였다.

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Implementation of Multi-Band Mobile PIMD Measurement System. (Multi-Band 이동통신용 수동혼변조왜곡 측정시스템 개발)

  • Park, Ki Won;Shin, Dong Whan;Rhee, Young Chul
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.703-705
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    • 2016
  • In this paper, we developed a wideband PIMD system to measure passive intermodulation distortion signals of mobile communication RF passive module. To represent wideband characteristic, we designed a receiver that meets low-noise and wideband characteristics in RF receiver. It allows high dynamic range in the RF receiver front end. In designed passive intermodulation distortion measurement system, we programed to display a PIMD signal with FPGA/DSP at PC. Implemented PIMD system was variable from 650 MHz to 2700 MHz and show up to -138 dB minimum detectable $3^{rd}$ passive inetrmodulation distortion signal.

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Analysis and Optimization of Passive intermodulation in Microwave Coaxial Cavity Filters

  • Cho, In-Kui;Kim, Jin-Tae;Jeong, Myung-Yung;Choy, Tae-Goo;Kang, Young-Il
    • ETRI Journal
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    • v.25 no.2
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    • pp.133-139
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    • 2003
  • We studied how the passive intermodulation (PIM) power arising in air cavity filters could be calculated and how the design of the filter could be optimized in order to reduce the amplitude of the PIM signal. To do this, using simulated results, we optimized the various parameters of a filter. PIM in an air cavity filter depends on the power dissipated in its cavities. A reduction of this power loss therefore decreases the PIM power in the air cavity filter. Our experimental results confirm that it is possible to design and produce air cavity filters that generate low PIM signals.

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