No abstract

No abstract

We present a new compact wideband MIMO (multiple input multiple output) antenna-the double-sided 4-port armtapered self-grounded monopole array, briefly referred to as the butterfly antenna, in the paper. The antenna is very compact with low correlation between ports and high diversity gain. The genetic algorithm optimization scheme has been employed in the design. Simulation results have been verified against measurements. The measured reflection coefficients at all ports are below-7 dB over 0.5-9 GHz and below-4.5 dB over 0.4-0.5 GHz and 9-15 GHz. The measured correlation coefficients are below 0.4 over 0.4-15 GHz and lower than 0.1 in most of the frequency band. This new MIMO antenna is developed as a transmit antenna in reverberation chambers, and we believe that it will find more applications in other systems, such as micro base station antennas in wireless communication systems.

. (2017). Double reflector configuration for optimal exposure of wideband focal plane arrays with optical beamforming. IEEE Transactions on Antennas and Propagation, 65(8), 4316-4321. [7935463]. DOI: 10.1109/TAP.2017 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-An optimized double-reflector antenna concept for a wideband focal plane array (FPA) configuration is presented for Ka-band applications with a limited scan range, e.g. ground terminals for satellite communication. The proposed reflector configuration allows to maximize the number of active array elements and minimize the actual array size during scanning. In addition, the FPA configuration has been optimized for wideband optical true-time-delay (TTD) beamforming, resulting in wideband operation from 20-40 GHz. Based on a minimum required 80 % aperture efficiency at 30 GHz, the double-reflector concept allows expanding the illuminated region of the array by a factor of 60 as compared to traditional prime-focus configurations. The proposed configuration also decreases the magnification factor M by a factor of 2.5, as compared to the double-parabolic configuration for a ±1.5 0 scan range.

No abstract

No abstract

DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

The paper studies the performance of a novel ultra-wideband multiport self-grounded bow-tie antenna and presents simulated embedded radiation efficiencies and correlation at each antenna port, and the diversity gain of the antenna in rich isotropic multipath environment.