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For some applications the use of metal backed substrates is advantageous. The solid backside-metallization provides a good heatsink and gives the possibility to produce MMIC-cavities by milling. However, the circuit design is bounded to one layer, and therefore the choice of suitable waveguide transitions is limited. Especially if right-angle transitions are needed, no structures are known to the...
Getsinger's Longitudinal Section Electric model describing the propagation characteristics of a single layer microstrip line is modified to cater for `n' layers. An accurate closed-form expression for two and three layered structures is presented and validated against full-wave numerical results. The computed effective permittivity for a randomly selected two and three layer dielectric microstrip...
In this paper, a waveguide antenna with miniaturized-aperture using a single split-ring-resonator (SRR) is proposed. A wide bandwidth is achieved by using a single SRR and optimizing the distance between it and the ridge end. The measured bandwidth of 3.40-3.54 GHz (a fractional bandwidth of 4.03%) is much wider than that of the previous waveguide antenna using multiple rings (4.96-5.00 GHz with a...
This paper reports on recent research on folded ref-lectarray antennas done at the University of Ulm. The first area of work deals with the investigations of reflector elements with improved phase angle range and the influence of different effects on bandwidth and antenna gain including cell type, size, or substrate layer structure. A second area of work is the precise characterization of reflector...
An E-band aperture coupled patch antenna using a combination of GaAs and liquid crystal polymer (LCP) substrates packaged with a laminated multi-chip module (MCM-L) process is presented in this paper. The antenna offers an electromagnetic interface between a GaAs MMIC and a separate dielectric antenna package. Design, manufacture, packaging and test results of the proposed antenna are presented. Measurement...
The ISM band at 60 GHz provides sufficient bandwidth for wireless transmission of data rates in the Gbps range. To fully utilize this unlicensed frequency range, the design of suitable antennas has to account for application-specific demands in terms of frequency bandwidth and antenna gain. We present a successful implementation, based on a compact patch array approach, meeting realistic requirements...
A compact microstrip BSF using quasi-lumped elements is proposed in this paper. The filter consists of inductor lines and inter-digital-type gap capacitors as quasi-lumped elements. The resonator using the above elements is represented by a series LC resonator. The design of the resonator was performed by changing the structural parameters so that the reactances of the inductor (positive) and the...
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