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In this paper, a novel compact integrated antenna-diplexer for Frequency-division duplex low latency wireless backhaul links at E-band is presented. The proposed solution is designed in a multilayer architecture with each layer having different functional blocks. The layers have been stacked on top of each other without any electrical contact requirement between them. This is achieved by using packaging...
By taking advantage of a wideband bow-tie antenna in the Yagi configuration, a novel multilayer-stacked ultra-wideband (UWB) Yagi antenna is proposed. First, the fundamental 3-layered UWB Yagi model is studied with respect to a few critical dimensions. Then, several directors are added to form a multilayer-stacked Yagi antenna, where the width of the directors is optimized in a monotonic decreasing...
With growing demand for mm-Wave applications, gap waveguide technology introduced many advantageous features compared to hollow waveguides or SIW. Till now several wideband, high-efficiency and highly directive planar gap waveguide antennas have been proposed. Recently, a new form of pins, the so called half-height pin, is proposed for realizing gap waveguide technology. In this paper, a wide-band,...
This paper describes a wide-band dual-polarized slotted-waveguide antenna working at V-band (57–66 GHz) based on Gap Waveguide concept. The antenna has three layers. The first one (feeding-layer 1) is practically identical to the second one (feeding-layer 2). This optimizes the design and facilitates manufacturing. The corporate-feeding networks on the two layers are rotated 90 degrees to each other...
This paper presents the recent developments of gap waveguide technology and random-LOS OTA test technology. The applications on beam-steerable massive MIMO antennas and the characterization with random-LOS are emphasized.
A new truly conical geometry of Eleven antenna for high frequency applications is proposed in the paper. By using this geometry, the antenna petal arrays are made on only one piece of flat thin PCB, which is soft enough to be conically bent and strong enough after the conical bending to be fastened stably by only the center pack cone and the outer walls. Therefore, many manufacture difficulties by...
The Eleven antenna is a log-periodic folded-dipole-pair array which has two unique radiation characteristics: constant beamwidth and fixed phase center location over decade bandwidth. Therefore, the Eleven antenna is very suitable as a feed for reflector antennas. This paper presents a new compact design of 1.2 – 10 GHz Eleven antenna by folding down the outermost elements of the array. By doing so,...
A new method is described in the paper to predict the reflection coefficient of a complete large log-periodic array (with large number of elements) from the computed performance of a small part of the array. The small part is referred to as the partial array. The method involves computing the embedded S-parameters between all the elements of this partial array and then using these S-parameters to...
This paper presents two useful algorithms for efficient numerical simulations in design of large log-periodic array antennas by using commercial EM Solvers. Both algorithms take into account the finite size of large log-periodic array and make use of the periodicity to achieve faster numerical computations. The Eleven antenna is taken as an example to demonstrate the algorithms. Simulated and measured...
Log-periodic array antennas can provide a constant radiation performance and good reflection coefficient performance over a wide frequency band, which can be considered as an important characteristics of this type antennas. In this paper, the configuration requirement for general log-periodic array antennas is presented in order to have constant radiation function and periodicity of the reflection...
This paper presents some new topics that will be lectured in the December 2011 course within European School of Antennas course on Reflector and Lens Antennas. The new material is mainly related to characterization of wideband feeds for reflector antennas for future radio telescopes, such as for SKA and VLBI 2010. The lectures will contain details of how to design decade bandwidth log-periodic antenna...
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