Antena

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  • Topic: Antenna, Radio, Antennas
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  • Published : February 5, 2013
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Antenna Measurements
Viet-Thuy Vu and Mats I. Pettersson
Blekinge Institute of Technology, 37179 Karlskrona, Sweden Email: viet.thuy.vu@bth.se Abstract The project of the course Radio Communication Technology and System ET1412 includes two assignments, ”Antenna Measurement and Characterization” and ”Radio Propagation Channel Measurement and Modeling”. This assignment is about antenna measurement and characterization. In this assignment, students are required to perform the measurements of the solid parabola’s patterns in the indoor and/or outdoor environments (depending on weather) using the Vector Network Analyzer (VNA) Agilent E5071C and the 2.4 GHz antennas, investigate and characterize the measured patterns using Matlab.

I. I NTRODUCTION A radio communication system usually has certain requirements for the antennas used in that communication system. For example, a radio and television broadcasting system usually requires an antenna array which its pattern is almost omnidirectional in the azimuth plane. Antennas used for the mobile communication are necessary to be small and can be integrated in electronic circuits while their characteristics must fulfill the demands of the mobile communication. To satisfy such requirements, characteristics of antennas must be examined and evaluated. Typical parameters of an antenna are input impedance, polarization, radiation efficiency, directivity, gain and radiation pattern. Other important parameters are resonant frequency, bandwidth and Voltage Standing Wave Ratio (VSWR). In the frame of the course Radio Communication Technology and System ET1412, students are required to perform the measurements of the antennas using the Vector Network Analyzer (VNA) Agilent E5071C and the 2.4 GHz antennas, and characterize these antennas using Scilab and Matlab. The environments for the measurements are indoor and outdoor. The radio communication system formed by the VNA and the antennas is a narrowband system. In section II, the equipments used for the assignment are listed. Section III describes the assignment tasks. The method of the assignment performance is presented in section IV. The instructions for assignment report and presentation is given in section V. The principle of the project evaluation is provided in the last section. II. E QUIPMENTS A radio communication system used for the measurements includes the following equipment • Vector Network Analyzer (VNA) Agilent E5071C (Agilent) [1]. • Smarteq solid parabola WLAN-antenna, SP45/24 [2]. • Smarteq SMA connector - N connector Low Loss Cable 20 m. • Rohde&Schwarz N connector - N connector Low Loss Cable 3 m. • AEH-510 Azimuth and Elevation Head (A.H. System). • ATU-512 Tripods and Mounting Adapters (A.H. System). III. A SSIGNMENT TASKS Students are required to perform the following tasks to complete this assignment of the project of the course Radio Communication Technology and System ET1412. A. Study of Antenna Theory and Smarteq Solid Parabola WLAN-antenna SP45/24 The following basic antenna theory knowledges are required for students attending this assignment [3]: • Far field condition as well as near field and Fresnel region. • Two forms of Friis formula (gain and effective area). • Polarization (linear, horizontal, vertical). • Dipole antenna (field derivation, investigate Dipole antenna pattern using Matlab). • Antenna array (array factor derivation, investigate array using Scilab). These knowledges are necessary to setup the equipment for the measurements. In addition, the deep knowledges about the technical characteristics normally obtained from the measured results such as • Antenna resonant frequency. • Antenna bandwidth. • Voltage Standing Wave Ratio (VSWR). • Azimuth and elevation patterns.

are obligated in order to complete this assignment. Smarteq Solid Parabola WLAN-antenna SP45/24 [2] is used in this assignment, an investigation of this kind of antenna is necessary. The antenna knowledges need to be used to in this...
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