A miniaturized MMIC analog phase shifter using two quarter-wave-length transmission lines

In this paper, a gas sensor using a modified 90° hybrid coupler structure with conducting polymer which operates at 2.4 GHz is represented. Conducting polymers are used to the gas sensing material in proposed sensors. The conducting polymer varies its electrical property, such as work function and conductivity corresponding to the certain gas. To verify this variation of electrical property of conducting polymer at microwave frequencies, the conducting polymer is incorporated with the 90° hybrid coupler structure, and this proposed sensor operates as reflection type variable attenuator and variable phase shifter. The conducting polymer is employed as impedence-variable transmission lines that cause a impedance mismatching between the general transmission line and conducting polymer. The experiment was conducted with 100 ppm ethanol gas at temperature of 28℃ and relative humidity of 85 %. As a result, the amplitude deviation of   is 0.13 dB and the frequency satisfying ∠   360° is shifted about 2.875 MHz.

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Section: -3 신호변환기(Transducer)unclassified

RF Gas Sensor Using 4-Port Hybrid Coupler with Conducting Polymer

Lee¹,

Kim²,

Lee

et al. 2015

The Journal of Korean Institute of Electromagnetic Engineering

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“…If we assume that a grating lobe of receives enough attenuation so long as at least half of its beamwidth falls outside the main beam of , referring to Fig. 2(d), this condition can be expressed by (6) cannot be greater than , on the other hand, and may be written as: (7) Using (7), (6) is simplified to the following form: (8) which in terms of the array parameter may be written as (9) Equation (9) represents the condition on the subarray length and spacing to avoid grating lobes in the overall array factor. Considering that is in fact the distance which is allocated to each subarray in the secondary array, it is useful to define an overlapping factor (10) which basically represents the fraction of the length of a subarray which overlaps with each of its neighboring subarrays.…”

Section: A Theorymentioning

confidence: 99%

“…Over the years, array designers have tried to simplify the design process by resorting to powerful full-wave numerical techniques in conjunction with built-in optimization methods [2]- [4]. Also Significant advancement in MMIC and the emerging RF-MEMS technologies has provided the designers with compact and more reliable phase shifters [5], [6]. Yet, with the complexities in the corporate feed and phase control networks, and their interactions with the radiating elements, implementation of the large phase arrays remains a challenging engineering problem.…”

mentioning

confidence: 99%

An affordable millimeter-wave beam-steerable antenna using interleaved planar subarrays

Abbaspour-Tamijani

Sarabandi

2003

IEEE Trans. Antennas Propagat.

132

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Abstract-Design and fabrication aspects of an affordable planar beam steerable antenna array with a simple architecture are considered in this paper. Grouping the elements of a phased array into a number of partially overlapped subarrays and using a single phase shifter for each subarray, generally results in a considerable reduction in array size and manufacturing costs. However, overlapped subarrays require complicated corporate feed networks and array architectures that cannot be easily implemented using planar technologies. In this paper a novel feed network and array architecture for implementing a planar phased array of microstrip antennas is presented that enables the fabrication of low-sidelobe, compact, beam-steerable millimeter-wave arrays and facilitates integration of the RF front-end electronics with the antenna structure. This design uses a combination of series and parallel feeding schemes to achieve the desired array coefficients. The proposed approach is used to design a three-state switched-beam phased array with a scanning width of 10 . This phased array which is composed of 80 microstrip elements, achieves a gain of 20 dB, a sidelobe level of 19 dB and a 10-dB bandwidth of 6.3% for all states of the beam. The antenna efficiency is measured at 33-36% in band. It is shown that the proposed feeding scheme is insensitive to the mutual coupling among the elements.Index Terms-Beam steering, interleaved subarrays, millimeter-wave antennas, phased arrays, subarray overlapping.

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“…Using GaAs MMIC technology, another work [109] was presented where a phase shift of 210° with a loss of 4.9 dB and a 1-dB input compression point of higher than 5 dBm was measured at 6.2 GHz. Based on the same structure, a miniaturized Ku-band GaAs MMIC phase shifter using two quarter-wave-length transmission lines was reported in [110]. A phase shift of more than 180° and an insertion loss of 3.6 dB are obtained at the frequency range from 12 to 14 GHz.…”

Section: Chapter IV -------------------------------------------------mentioning

confidence: 99%

“…The overall simulated performance and operating frequency range of this phase shifter are compared favorably with those of the reflection phase shifters using GaAs MMIC technology [108]- [109]- [110]. In [108] a phase shift of 109° with an insertion loss of 1.8 dB over 16-18 GHz was achieved by only placing one inductor and varactor at each coupler's output port.…”

Section: Chapter IV -------------------------------------------------mentioning

confidence: 99%

Design of GaN-based Microwave Components and Application to Novel High Power Reconfigurable Antennas

Hamdoun¹

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This thesis demonstrates the feasibility of using gallium nitride (GaN) technology in reconfigurable RF systems. GaN-based varactor diodes and switch circuits are pursued as promising candidates for high-power/high-frequency applications. The first part is devoted to active GaN device development. Active components were realized using the Canadian National Research Council (NRC) GaN HEMTs process. Based on three process, such as, GaN150v0 (gate length of 0.15um), GaN500v1 and GaN500v2 (both with gate length of 0.5um), many varactor diodes with size different have been manufactured and characterized via DC and RF smallsignal and large-signal measurements. Then, the varactor diodes were modeled by This thesis research has been conducted as a collaboration between University of Rennes 1 through "l'Institut d'Electronique et de Télécommunications de Rennes (IETR)", and Carleton University through the "Department of Electronics (DOE)". This collaboration is created from the PhD cotutelle (joint) program offered by both institutions. DOE has the expertise in CAD for electronic circuit design, RF and microwave circuits, photonics and integrated circuit using semiconductor technologies including GaN technology. A group of researchers from Carleton University is deeply involved in developing of circuits based on GaN technology.

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A miniaturized MMIC analog phase shifter using two quarter-wave-length transmission lines

Cited by 13 publications

References 8 publications

RF Gas Sensor Using 4-Port Hybrid Coupler with Conducting Polymer

RF Gas Sensor Using 4-Port Hybrid Coupler with Conducting Polymer

An affordable millimeter-wave beam-steerable antenna using interleaved planar subarrays

Design of GaN-based Microwave Components and Application to Novel High Power Reconfigurable Antennas

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