This brief presents a novel design of a dual-band equal split Wilkinson power divider. It is based around a single coupled line section as core and uses stub-based port matching networks at each of the ports. It then incorporates only one isolation resistor, which is independent of frequency-ratio, for achieving perfect isolation. Closed form design equations are developed for the general analysis of the power divider and design case studies are provided to evaluate the proposed design. The developed prototypes for frequency-ratios of 2 and 7 show a good agreement between the electromagnetic simulated and measured results and thus validate the reported theory.

This brief introduces a novel concept of a virtual impedance for tri-band impedance matching. The proposed mathematical concept, when applied in practical realization, simplifies the design of tri-band matching to a great extent and also enhances the achievable frequency transformation ratios beyond 7.3. A good agreement between simulation and measurement results on a prototype, designed on RO5880 substrate, operating at three unrelated commercial frequencies of 1.8 GHz, 2.4 GHz, and 5.8 GHz demonstrate the effectiveness of the presented concept.

This article presents the design scheme of a wideband Wilkinson Power Divider (WPD) with two-stage architecture utilizing quarter-wave transmission lines and short-circuit stubs. The bandwidth of the proposed WPD is flexible and can be controlled using the design parameters. The proposed design achieves excellent isolation between output ports in addition good in-band performance. The analysis of the proposed circuit results in a simplified transfer function which is then equated with a standard band-pass transfer function to determine the parameters of transmission lines, stub’s impedances, and the value of the isolation resistors. Furthermore, it is also demonstrated that a simple alteration in the proposed circuit enables the design of a wideband DC isolated WPD that maintains a good in-band and isolation performance. A number of case studies have been included to highlight the flexibility of the proposed design. Two distinct prototypes are developed on different boards to demonstrate the wideband performance of the proposed design. An excellent agreement between the experimental and measured results for both the designs over a wide band including very good isolation between ports validate the proposed design.

In this paper, a novel design of a tri-band impedance matching network has been reported. The design considers the newly developed concept of matching at a common reference frequency. The core of the proposed technique is cascade of two L-section dual-band matching networks. This scheme is capable of impedance matching at any three arbitrarily chosen frequencies of interest with a good frequency ratio. In addition, a prototype developed on RO5880 substrate to operate at frequencies of 1.8GHz, 2.4GHz and 5.8GHz, demonstrates good performance and shows the practical utility of the presented technique.

A design scheme is presented for an all‐pass coupled‐line (APCL)‐based dual‐band impedance‐matching network. Salient features include a highly flexible frequency ratio (r) (high of 15 and low of 1.2) and impedance transformation ratio (k) (high of 9 and low of 0.2) simultaneously at two arbitrary, uncorrelated frequencies of interest. The design strategy consists of two APCL sections and a stub that prove to be simple and easy to prototype. Detailed mathematical modelling and graphical interpretations have been presented. Closed‐form design equations have been developed and backed up with design examples. Two dual‐band T‐junction power dividers (TPDs) have been designed to demonstrate the application of the proposed impedance transformer at two widely separated frequencies. RO4350 B‐ and RO5880‐based prototypes have been fabricated for both the matching network and the TPD to validate the proposed theory. The measurement results demonstrate an achievable frequency ratio of 15 and an impedance transformation ratio of 9 in simultaneous operation mode.