A microstrip‐line phase shifter constructed by a tunable filter

Morikawa, Daichi; Deguchi, Hiroyuki; Tsuji, Mikio; Shigesawa, H.

doi:10.1002/ecjb.20253

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The use of monopole antenna in wireless portable devices has increased in the recent years due to the integration facilities that entail its characteristic low profile. Many designs have appeared in the literature with the aim of covering the largest number of frequency bands as possible without reducing the antenna performance [1][2][3][4]. In Ref.…”

Section: Discussionmentioning

confidence: 99%

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A wideband 360° analog phase shifter design

Xiao

Cheung

Yuk

2009

2009 Canadian Conference on Electrical and Computer Engineering

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This article proposes a reflection-type wideband 360 analogue phase shifter in microstrip form. It employs a 3-dB branch-line coupler circuit to achieve a wideband operation and two varactor-diode circuits to achieve 360 phase shift. Formulas are derived to optimize the dimensions of the microstrip lines in the coupler and the varactordiode circuits for wideband operation and minimizing frequency dependency of the output phase. Experimental results show that the design has a 360 phase-shift range and 1 dB insertion loss, with a 500-MHz operation bandwidth at the center frequency of 6.5 GHz.

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Section: Discussionmentioning

confidence: 99%

“…In Ref. [4], a microstrip transmission line filter with loaded varactor diodes in short-circuited stubs was used to achieve a 360 phase shift, but it required a wide pass-band filter and multi-section stubs. In Ref.…”

Section: Introductionmentioning

confidence: 99%

A wideband 360° analog phase shifter design

Xiao

Cheung

Yuk

2009

2009 Canadian Conference on Electrical and Computer Engineering

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“…In operation, the variation of the varactor's capacitance arising from the applied reverse bias voltages through the RF choke causes changes in the electrical length of the open-circuited stub and results in an electrically tuned passband [7]- [9]. Note that such tuned passband has a large (4.7 GHz or higher) but fixed BW at a given reverse bias voltage.…”

Section: Device Configuration and Working Principlementioning

confidence: 95%

A Varactor and FMR-Tuned Wideband Band-Pass Filter Module With Versatile Frequency Tunability

2011

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A varactor and FMR-tuned wideband band-pass filter (BPF) module with versatile frequency tunablity has been devised and realized on RT/Duroid substrate. By connecting four variable capacitance diodes (varactors) to the four open-circuited stubs of an X-band passive composite-BPF and adjusting the reverse bias voltage from 2 to 22 V, the 3 dB passband of the passive composite-BPF was continuously tuned from 7.7-12.4 GHz to 11.4-17.5 GHz. The corresponding bandwidth (BW) was enlarged from 4.7 to 6.1 GHz and the upper frequency of the passband was extended from 12.4 to 17.5 GHz, namely, a total frequency span of 9.8 GHz. The BW of the passive composite-BPF was further FMR-tuned using a pair of Band-Stop Filter (BSF). By setting the reverse bias voltage at 22 V together with the bias magnetic fields at 3250 and 4200 Oe, respectively, to the two BSFs, the 6.1 GHz BW and 9.8 GHz frequency span were compressed to 1.4 GHz toward the high-end frequency. The 4.7 GHz BW and 9.8 GHz frequency span were also compressed to 1.0 GHz toward the low-end frequency with 2650 and 3500 Oe bias magnetic fields and 2 V reverse bias voltage. Thus, the combination of the varactor and FMR-tuning has facilitated versatile passband and its BW tuning covering the X-and Ku-bands with both large frequency tunability and greatly improved frequency selectivity.

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