Miniaturized Wilkinson power divider using three-dimensional MMIC technology

Nishikawa, Kenjiro; Tokumitsu, T.; Toyoda, Ichihiko

doi:10.1109/75.536949

Cited by 41 publications

(22 citation statements)

References 8 publications

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“…A power divider using lumped elements can achieve a compact circuit size [4,5]. On the other hand, a power divider with a three-dimensional structure is also miniaturized [6]. Dual-band power dividers attract more and more attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Compact Wilkinson power divider with harmonic suppression

2007

Micro & Optical Tech Letters

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Section: Introductionmentioning

confidence: 99%

Compact Wilkinson power divider with harmonic suppression

2007

Micro & Optical Tech Letters

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“…The nature of the transmission line length has long impeded its applications in monolithic microwave integrated circuits (MMICs), especially for frequencies below 10 GHz. Consequently, efforts have been made to miniaturize the size of a Wilkinson power divider by using three-dimensional (3-D) technologies [1], lumped-distributed techniques [2], and capacitive loading [3]. However, it is still a challenging task to implement a power divider with a chip area suitable for monolithic system integration.…”

Section: Introductionmentioning

confidence: 99%

A miniaturized Wilkinson power divider with CMOS active inductors

Liao

2005

IEEE Microw. Wireless Compon. Lett.

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Abstract-A miniaturized Wilkinson power divider implemented in a standard 0.18-m CMOS process is presented in this letter. By using active inductors for the circuit implementation, a significant area reduction can be achieved due to the absence of distributed components and spiral inductors. The power divider is designed at a center frequency of 4.5 GHz for equal power dividing with all ports matched to 50 . Drawing a dc current of 9.3 mA from a 1.8-V supply voltage, the fabricated circuit exhibits an insertion loss less than 0.16 dB and a return loss better than 30 dB at the center frequency while maintaining good isolation between the output ports. The active area of the miniaturized Wilkinson power divider is 150 100 m 2 , which is suitable for system integration in monolithic microwave integrated circuit (MMIC) applications.Index Terms-Active inductors, lumped power divider, miniaturization, monolithic microwave integrated circuit (MMIC), regulated cascode, Wilkinson power dividers.

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“…However, an extra lumped inductor is required for this structure. Other approaches to reduce the size of Wilkinson power dividers include exploiting the slow-wave effects in the form of a photonic bandgap (PBG) structure [6], or using threedimensional technologies [7]. In this article, a modified Wilkinson power divider is investigated.…”

mentioning

confidence: 99%

Capacitively loaded Wilkinson power divider with size reduction and harmonic suppression

Xue

2007

Micro & Optical Tech Letters

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averaged images. It could be considered as a mechanical tool for speckle reduction. CONCLUSIONSWe have presented theoretical and experimental results that illustrate speckle reduction in full W-band. Industrial inspection-test through the packaging-could benefit from such arrangements. Applications of speckle-free millimeter-wave imaging are possible in food technology, pharmacy, and in noncontact material examinations. INTRODUCTIONThe Wilkinson power dividers/combiners are one of the most commonly used components in microwave circuits and systems. Both have the same structure, which consists of two g /4 branches of transmission line having characteristic impedance of ͱ2 Z 0 and a termination resistor, where g is the guided-wavelength of the transmission line at the center frequency. They are matched at all input and output ports simultaneously and provide a good isolation between the input/output ports for the power combiner/divider. However, the conventional power divider has large size, especially at the lower frequency band, and spurious passband responses due to the periodic characteristics of the transmission lines. Therefore, techniques for size reduction and harmonic suppression of the power divider are required for many design requirements. With three capacitors located at the three ports [1], the size of the power divider can be reduced. Recently, Lee et al.[2] investigated a Wilkinson power divider by employing -type multiple coupled microstrip line, and miniaturization is achieved for the proposed structure. Using lumped elements, compact Wilkinson power dividers are also studied [3,4]. In [5], Yi and Kang proposed a power divider structure, where two transmission line stubs are attached in the middle of the quarter-wavelength branches, and another lumped inductor is introduced between the outputs of the power divider. With these modifications, nth harmonic can be suppressed by choosing a proper stub length and, therefore, good performance can be achieved. However, an extra lumped inductor is required for this structure. Other approaches to reduce the size of Wilkinson power dividers include exploiting the slow-wave effects in the form of a photonic bandgap (PBG) structure [6], or using threedimensional technologies [7]. In this article, a modified Wilkinson power divider is investigated. By attaching two lumped capacitors in the middle of the two quarter-wavelength branches of the conventional power divider, and without using the lumped inductor compared to the structure in [5], both size reduction and harmonic suppression for the introduced power divider can be achieved. For demonstration purposes, a microstrip Wilkinson power divider, centered at 1.5 GHz, is designed and examined. A size reduction of 48% and nth harmonic suppression are achieved as comparing with the conventional one. Both simulations and measurements are presented, and a good performance is observed. CAPACITIVELY LOADED WILKINSON POWER DIVIDERThe schematic diagram of the investigated Wilkinson power divider is shown in Figure 1,...

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Miniaturized Wilkinson power divider using three-dimensional MMIC technology

Cited by 41 publications

References 8 publications

Compact Wilkinson power divider with harmonic suppression

Compact Wilkinson power divider with harmonic suppression

A miniaturized Wilkinson power divider with CMOS active inductors

Capacitively loaded Wilkinson power divider with size reduction and harmonic suppression

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