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In this letter, a novel lumped Wilkinson power divider (WPD) introducing capacitors on the isolation R of ultra wideband with good isolation and insertion loss (IL) performance is proposed with the help of gallium arsenide (GaAs) technology. With the even and odd method, the proposed WPD is better illustrated. The fractional bandwidth (FBW) is 104% (3–9.5 GHz). Besides, the return loss is better than 13.7 dB, and the IL is better than 0.62 dB within the passband. The isolation is better than 19.5 dB from 3 to 9.5 GHz. Finally, to better illustrate the design conception, it has been fabricated on GaAs integrated passive device technology with size of 1.37 × 0.971 mm2, that is, 0.1 × 0.072 λg2, measured by on‐wafer probing. All the final results of the proposed WPD are reasonably matched well. [ABSTRACT FROM AUTHOR]

In this article, a novel topology of wideband on‐chip Wilkinson power divider (WPD) with good insertion loss (IL) performance is proposed and demonstrated on gallium arsenide (GaAs)‐based integrated passive device (IPD) technology. The proposed WPD is further analyzed by the even and odd method. To verify the advantage of the proposed WPD against the conventional one, two examples are numerically investigated, showing that the proposed one achieves better performance in terms of IL and isolation. In addition, the proposed design achieves a miniature area and small amplitude and phase imbalance (AI) performance. The fractional bandwidth (FBW) of the proposed WPD is 100% (6‐18 GHz), where the magnitude imbalance is less than 0.08 dB and phase imbalance is better than 0.4°. Furthermore, the minimum IL is better than 0.96 dB and return loss is better than 13.7 dB within the core passband. Meanwhile, the isolation of the WPD is better than 17.6 dB. Finally, to further demonstrate our design conception, the proposed WPD has been fabricated on GaAs IPD technology with size of 1.5 × 0.9 mm2, and measured by on‐wafer probing. All the simulated and measured results of the proposed WPD are matched reasonably well with each other, thus firmly validating the claimed superior performance of the proposed WPD in the wide operating bandwidth, low IL, and high isolation. [ABSTRACT FROM AUTHOR]

In this paper, we present a new wideband miniature branchline coupler as a key circuit to be integrated in 60-GHz packaged beamforming networks for phased-array antennas. First, the integrated passive device (IPD) technology from STMicroelectronics is investigated in the mm-wave range through the simulation, fabrication, and measurements of a microstrip line and a simple hybrid coupler. Then, a novel coupler topology with emphasis on miniaturization and broadband operation is theorized. Analytical equations are derived and a 60-GHz coupler is optimized on IPD technology. Measurement results are discussed and compared with state-of-the art publications. The whole 57–66-GHz bandwidth is efficiently covered with the three following performance: -10\-dB impedance matching, \pm1\-dB amplitude imbalance, and \pm5^\circ phase imbalance. As an application example, the novel coupler is integrated into a 4 $\,\times\,$ 4 Butler matrix suitable for an array-antenna demonstrating state-of-the art performance in terms of insertion loss and phase error. The measurement of different samples shows low variation of the IPD process because of very good reproducibility making it a suitable candidate for circuits operating in the 60-GHz band. [ABSTRACT FROM AUTHOR]