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Accurate characterization of a three-port balanced-unbalanced (balun) device requires a four-port vector network analyzer (VNA), which might be not easily available. Thus, it is a common practice to terminate one of the three ports and to use a standard two-port VNA. However, applicability of the above approach is limited since the ports at the differential side of the balun are tightly coupled. This...
We developed a fundamental testbed and investigated the suitable transducer for the wireless power transmission (WPT). We also had reported experimental results of the transmission efficiency in water by using the commercial transducer (COM) which only designed to match to the acoustic impedance of water by its structure and the electric impedance of the transmitter and receiver by matching networks...
A simplified technique and analytical expression is proposed to generate layout-efficient coplanar circular spiral inductors and to accurately predict their length, and hence performance, in multilayer multichip module technology. Using the new layout generation technique and developed closed-form expression, circular spiral inductors are designed and modelled with remarkably high performance and...
The design of microwave filters and multiplexers usually starts from the synthesis of a coupling matrix M. The elements of the main diagonal identify invariant reactances that shift the resonant frequency at resonator nodes, and are usually zero at port nodes. However the analysis of the coupling matrix show that non-zero elements are allowed too. This work show that this reactances can model the...
A generalized Wilkinson power divider with additional transmission lines between the isolation resistor and output ports is presented that decreases parasitic effects. The design equations for the generalized model are given. The experimental results showed the validity of this circuit.
A general model of port separation dual-band Wilkinson power dividers with series RLC components is discussed. Closed-form design equations for two design methods based on an even- and odd-mode method are given. Experimental results are also presented.
We analyze the radiative properties of a couple of optical nanoantennas fed at a gap region. We demonstrate that the radiation pattern can be controlled at the nanoscale, and unidirectional radiation can be obtained by placing two nanorods at a distance in the order of λ/20, in stark contrast with the λ/4 spacing which is typical of Yagi-Uda antennas. Conventional techniques commonly used at microwaves,...
A recent 3-D finite element method allows the complex Floquet propagation constant of a periodic structure to be computed at a specified frequency by solving a sparse, generalized eigenvalue problem. To determine the propagation constant for a frequency range requires repeating this eigenanalysis at a large number of frequency points, which is computationally expensive. A model order reduction technique...
In this paper we report the synthesis of metamaterial transmission lines by means of aggressive space mapping (ASM). Specifically, it is demonstrated that ASM can be applied to the automated layout generation of composite right/left handed (CRLH) microstrip lines based on a combination of complementary split ring resonators (CSRRs) and series gaps. To illustrate the potentiality and accuracy of the...
This paper analyses the use of filter combiners for sharing of antenna systems in cellular networks. Models for cell coverage and capacity are developed that directly relate the cell site count to combiner performance allowing the impact of filter combiners to be quantified and compared to alternative solutions.
Broadside coupled impedance transformers offer the potential for significantly improving the loss and bandwidth of matching networks for high power, broadband power amplifiers. There are currently no adequate scalable models available for prototyping designs. This work presents a novel method for developing an accurate, scalable, process specific, broadside coupler model which can be used to design...
In this paper a coupled model of microwave heating effect has been presented. The presented approach is based on coupled models reported already in literature. However, it allows handling problems where the oven cavity plays a role in heating, which is the case when combination ovens (ones including also heating elements installed) are considered or when imperfect isolation of the cavity walls results...
A design framework is introduced to expedite the design of novel material structures. We apply an adjoint-accelerated space mapping that takes advantage of adjoint sensitivities of the fine model. We show a sensitivity-enabled design framework that easily implements both space mapping and direct optimization. A flat lens and a π-shaped resonator are designed.
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