P. O. Iversen

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Spherical Near Field (NF) measurements are widely used in order to accurately characterize the radiating performance of antennas. The main drawback of this type of measurement is the acquisition time that, depending on the electrical size of the Antenna Under Test (AUT), could be very long. This is due to the fact that, in order to correctly evaluate the(More)
Current X-band links from LEO satellites to ground stations are limited in data rates because of their low gain, due to the global coverage by a single beam. In order to increase the data rate while keeping low DC consumption (so low transmitted power) and to enable simultaneous links with several ground stations, a multibeam scanning antenna was designed(More)
The overall physical dimensions of an antenna measurement facility depend on the largest expected test antenna, typically in the lower frequency band. On the other hand, dimensional tolerances are driven by the high frequencies, where antennas tend to be small. Thus, combining such requirements leads to choose a large and mechanically very accurate test(More)
This paper presents a comparative investigation of two versatile error-mitigation techniques, applicable to general antenna near-field measurement scenarios with echo signals of unknown origin. Both techniques are based on spatial filtering of the measured field, taking advantage of a priori knowledge of the antenna's size. The first approach takes(More)
Spherical near field measurement techniques combined with probe array technology offer a fast and accurate way to measure antenna performances. The use of increasingly higher frequencies and reduced testing time in all modern antenna applications has increased the need for probe array based measurement systems at higher frequencies.
Small antennas and other modern antenna applications are using increasingly higher frequencies while demanding very rapid development and testing cycles. A fast, reliable and accurate way to exhaustively determine antenna performance is based on spherical near field measurement techniques combined with probe array technology. This paper describes the(More)
This paper reports the findings of a comparative investigation of two versatile echo suppression techniques applicable to general antenna near field measurement scenarios with echoes of unknown origin. Both techniques are based on spatial filtering of the measured field taking advantage of the apriori knowledge of the antenna size and can be applied to near(More)
Recently the challenge of fully testing the high number of multi beam antennas embarked on future satellite systems has received considerable attention. Based on conventional antenna measurement techniques this testing would lead to unacceptable cost and duration. The use of fast probe array technologies to replace the spatial dimension of the measurements(More)
ALLGON MOBILE, the market leader in the field of antennas for mobile telephones, has recently purchased a spherical near-field antenna system from SATIMO operating in the 800MHz to 3.2GHz frequency band. This spherical near-field system, as shown in Figure 1, allows for real-time measurements of antennas and will among other be used for the measurements of(More)
In this paper, two filtering techniques for the suppression of range reflections in antenna measurements are compared based on simulated and measured data. The spherical modal filtering is based on the expansion of the measured field in spherical wave functions. Range reflections are suppressed by removing unwanted modes before transforming back to the(More)