A broadband uniplanar quasi-Yagi antenna – parameter study in application to a spatial power combiner, Journal of Telecommunications and Information Technology, 2001, nr 4

A parameter study is performed of a broadband uniplanar quasi-Yagi antenna with regard to its design and use in a spatial power combiner. A 3D full-wave electromagnetic field analysis is applied to identify parameters, which mostly affect the design frequency and operational bandwidth of this antenna. Optimal design conditions are determined. Using these design criteria a passive spatial power combiner employing trays of back-to-back connected quasi-Yagi antennas is developed. This combiner is investigated in terms of insertion losses and field uniformity, which are key factors in obtaining high power combining efficiency

Aperture coupled patch antenna sub-arrays for wireless communications applications

Two configurations of an aperture coupled microstrip patch antenna for bandwidth enhancement are applied to build two X-band linearly polarized 4×4 element sub-arrays using different substrates for patch layer. The first configuration explores an expensive thick substrate while the second uses a thin substrate in conjunction with a plastic foam insert. Although the first configuration offers a larger impedance bandwidth, the second configuration offers superior performance in terms of its radiation pattern and gain bandwidth. The second sub-array is a better candidate for future wireless applications which require an increased operational bandwidth

A Ku-band active transmit-array module with a horn or patch array as a signal launching/receiving device

This paper is concerned with the design of a Ku-band active transmit-array module of transistor amplifiers excited by either a pyramidal horn or a patch array Optimal distances between the active transmit array and the signal-launching:receiving device, which is either a passive corporate-fed array or a horn, are determined to maximise the power gain at a design frequency: Having established these conditions, the complete structure is investigated in terms of operational bandwidth and near-field and far-field distributions measured at the output side of the transmit array, The experimental results show that the use of a corporate-fed array as an illuminating/receiving device gives higher gain and significantly larger operational bandwidth, An explanation for this behavior is sought

Ku-Band 16 × 16 Planar Array with Aperture-Coupled Microstrip-Patch Elements

The design and development of a Ku-band linearly polarized 16 × 16 microstrip-patch array is presented. The array is fed by a corporate network, using dog-bone shaped coupling apertures. Thin substrates and low-loss foam are used for antenna-bandwidth enhancement. The design of the radiating patches and feed network was aided by the commercial software package, Ensemble®. Experimental results for the array, in terms of its return loss, radiation pattern, and gain, are presented