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# IEE Colloquium on Advances in the Direct Measurement of Antenna Radiation Characteristics in Indoor Environments

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Displaying Results 1 - 10 of 10
• ### Spatial sampling requirements for the wire scattering near-field antenna pattern measurement technique

Publication Year: 1989, Page(s):9/1 - 9/8
| | PDF (328 KB)

It is possible to take a finite set of near-field measurements from which the far-field pattern can be computed. It is not essential that the measured parameter is directly proportional to the local field vector, provided only that it permits the relevant information concerning the field distribution to be derived. The authors are investigating a method of deriving an antenna's radiation pattern f... View full abstract»

• ### Criteria for testing the performance of microwave absorbing materials

Publication Year: 1989, Page(s):8/1 - 8/3
| | PDF (116 KB)

Examines the various criteria relating to the traditional measurement of microwave absorbing materials. The testing of radar absorbing material is often carried out by using the arch configuration. This is a free-space reflectivity measurement where the sample is interrogated by a pair of horns operating in bistatic mode. Absorber samples of different sizes are compared with identically-sized flat... View full abstract»

• ### Resonant mode limitations with the Wheeler method of radiation efficiency measurement

Publication Year: 1989, Page(s):7/1 - 7/4
Cited by:  Papers (2)
| | PDF (132 KB)

The measurement of the radiation efficiency of electrically small antennas or those containing dissipative loading is not straightforward. Various methods for doing it have been presented in the literature but some are more practicable than others. An interesting approach known as Wheeler's method (1947) is outlined and some results obtained when using it are presented. Of particular significance ... View full abstract»

• ### A compact range fed by an array of log-periodic dipole antennas

Publication Year: 1989, Page(s):6/1 - 6/4
| | PDF (176 KB)

Compact ranges have traditionally used reflector antennas for illumination, but these are typically only usable at high frequencies, such that the reflector is a substantial number of wavelengths in width. For lower frequencies, control of the aperture illumination is better achieved by using an array antenna. Some numerical antenna pattern synthesis methods, stemming from the more generalised re... View full abstract»

• ### A probe technique for millimetre wave antenna diagnostics

Publication Year: 1989, Page(s):5/1 - 5/4
| | PDF (260 KB)

The original concept of surface field diagnostics has appeared in previous publications; however, recent developments in the detection system now enables the full potential of the technique to be realized. The new detection system employs a novel automated homodyne phase and amplitude detector operating over the frequency range 26.5-40 GHz. In addition to providing phase and amplitude information,... View full abstract»

• ### IEE Colloquium on Advances in the Direct Measurement of Antenna Radiation Characteristics in Indoor Environments' (Digest No.8)

Publication Year: 1989
| | PDF (24 KB)

The following topics were dealt with: dual reflector antenna time domain response measurement; gates and domains; MEL tapered anechoic chamber with HP8510 network analyser; MM wave antenna measurement systems; probe for MM wave antenna diagnostics; compact range fed by log-periodic dipole antenna array; Wheeler method of radiation efficiency measurement; microwave absorbing materials performance t... View full abstract»

• ### A technique for measuring the time domain response of a dual reflector antenna

Publication Year: 1989, Page(s):1/1 - 1/6
| | PDF (208 KB)

In a dual reflector antenna such as the axisymmetrical cassegrain antenna there are a number of mechanisms by which radiation incident on the antenna reaches the feed. An understanding of these mechanisms is important since they can affect the antenna radiation pattern and cause a ripple in the frequency response. The author describes how, by measuring the frequency response of an antenna and usin... View full abstract»

• ### Gates and domains [time-domain measurements on antennas]

Publication Year: 1989, Page(s):2/1 - 2/5
| | PDF (200 KB)

There are several reasons that one may wish to characterise a system, or analyse it, in terms of its response in the time-domain (TD). The reason for choosing to measure systems directly in the time-domain, rather than choosing to use subsequent computation from frequency domain measurements, may be different and the situation has changed with the availability of synthetic TD instruments. The HP87... View full abstract»

• ### The versatility of the MEL tapered anechoic chamber with an HP8510 network analyser

Publication Year: 1989, Page(s):3/1 - 3/4
| | PDF (104 KB)

The chamber was commissioned using standard Scientific Atlanta (SA) test equipment. Later the SA single channel receiver was replaced with a Hewlett Packard 8510 network analyser, the measurement system was automated and a comprehensive analysis software package implemented. This indoor test facility (anechoic chamber) is used to carry out measurements over the 0.25 to 30 GHz range on low gain ant... View full abstract»

• ### The design of millimetrewave antenna measurement systems

Publication Year: 1989, Page(s):4/1 - 4/7
| | PDF (352 KB)

Describes a study of the available technology for the measurement of antenna radiation patterns in the frequency range 90 GHz to 200 GHz. Several systems are proposed having theoretical dynamic ranges of between 40 dB and 84 dB at 180 GHz. Facilities such as RF phase measurement and time domain gating are considered. Experimental results with a system demonstrating a dynamic range of 62 dB and 180... View full abstract»