Grzegorz Jaworski

Dual-polarized stacked C-band antenna element with novel hairpin-type contactless stripline to stripline transition in multilayer integrated structure for SAR applications

Stacked dual-polarized antenna element for SAR applications is presented. The antenna element operates in C-band having 8% bandwidth. In order to achieve high isolation between ports generating orthogonal polarization orthogonal placement of two coupling slots has been applied. To provide additional isolation between vertical and horizontal polarizations the feeding lines generating orthogonal polarizations have been placed on different layers of multilayer stripline structure. Contactless hairpin-type band-pass transition between adjacent stripline layers has been designed and applied within the antenna feeding network to eliminate via interconnections and possible excitation of leaky modes. The measured results of the manufactured antenna element are in good agreement with the calculated ones.

Lightweight L and S-band antenna fed by three-strip directional couplers

Printed patch element are attractive from the electromagnetic point of view, however, their practical use often calls for involvement of layered composite panels. With such approach, patch elements can sustain mechanical loads or be integrated with antenna array carrying platforms. Owing to a lightweight multilayer structure with a thin substrate atop the thick one, the three-strip couplers put a lot of comfort in design of such antenna arrays. Wideband operation and low losses attract further attention to this coupler type as a good candidate for uses in antenna arrays. Dimensioning of the couplers are convenient for practical utilization in lower microwave bands. Furthermore, three-strip couplers make possible switching signals between printed circuit layers.

Broadband, Microstrip, Shaped Beam, C-Band Antenna for Application in Wireless LAN

A design and performance of the C-band, broadband, microstrip patch antenna for application in wireless LAN is presented. Feeding network with non-uniform power and phase distribution versus frequency was designed to provide beam shaping in elevation and azimuth plane. The simulated and measured characteristics of manufactured antenna as well as the parts of beam forming network are shown. Low cost mechanical design and materials have been applied.

Lightweight conformal dual band antenna for spaceborne applications

The paper presents a dual-band integrated antenna for use onboard spacecraft. The L- and S-band antenna was developed in a course of our research we have carried on spacecraft antennas. The designed antenna features low profile which is more and more often desired in modern spacecraft. However, when antennas have low profile it is extremely difficult to generate high quality circular polarization over the wide spatial angle across the beam of the antenna element. The design of antenna electromagnetic and microwave circuits are meeting this expectation, so one patch is capable to serve well communication subsystem in one band across the entire radio horizon seen from the International Space Station (about 4000 km in diameter). Owing to conformality in the profile the antenna can be mounted on Earth and save significant efforts during attachment of the module.

A design of feeding network for a dual-linear polarization, stacked, probe-fed microstrip patch antenna array

Components of multilayer feed network are presented for application in broad-band dual-linear polarized stacked C-band antenna. Measurement results of wide band matching circuits and different types of power divider networks constituting parts of BFN demonstrate wideband operation. Suitable matching of individual patches as well as stripline transitions have been developed.

Comparison of planar antenna feed networks with Wilkinson and coupled-line power dividers

Parallel and series planar antenna array feed networks composed of Wilkinson-type and coupled-line power dividers are examined. Phase characteristics are compared in a wide band. Some optimal behaviour of a parallel coupled-line power divider is observed. The measured characteristics of selected coupled-line power dividers are also presented.

Highly Integrated Ligthweight Dual Band Antenna with Dual or Quadruple Polarization Agility

Wireless and mobile communication often calls for dual-band antenna modules. Presently, agility in polarization properties in such antennas is getting on a sense of urgency. The antennas desired by the industry should be manufactured in the lightweight technology supporting high degree of integration between antenna elements and microwave feeding circuits. The well suited approach is use of multilayer composite panels carrying at the bottom side microwave printed circuits needed to generate at least two polarizations. This paper presents the results of our research on dual-band antenna modules with an integrated compact microwave feeding network.

Broadband feeding network for two circularly polarized antennas with inherent Transmitter-Receiver isolation

This paper presents the design and realization of a novel compact broadband antenna feeding network structure with inherent Transmitter-Receiver isolation developed for application in the ESEO satellite transceiver. The proposed feeding network is based on ring of four directional couplers and has been designed to feed the set of two microstrip antennas with circular polarization. The asymmetric 3 dB compensated directional couplers with improved directivity has been applied to provide high isolation in and high directivity in 55% wide band. The measured performance of the manufactured network prototype exhibits good properties and good agreement with the simulation results.