Integrated waveguide slot antennas
TL;DR: In this paper, single and dual-slot antennas are described, which operate at 10 GHz and 5 GHz, respectively, and they are integrated on microwave laminate, and single-and dual-slotted.
Abstract: Waveguide slot antennas integrated on microwave laminate are presented, and single and dual slot antennas are described, which operate at 10 GHz.
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TL;DR: In this article, the authors investigated low sidelobe longitudinal slot array antennas based on substrate integrated waveguide (SIW) technology for high performance communication and radar applications, and the achieved design goals on the radiation patterns were validated by the measured results which were in agreement with the simulated results.
Abstract: Low sidelobe longitudinal slot array antennas are investigated based on substrate integrated waveguide (SIW) technology. The design method consists of the characterisation of the radiating element, the synthesis of the linear array and the development of the planar array including a feeding power divider by performing full-wave electromagnetic simulations for the final accurate design. Two planar slot array antennas are fabricated with a normal printed circuit board (PCB) process. Low sidelobe features are verified by the measured results which are in agreement with the simulated results. For an 8 times 8 SIW slot array antenna, the measured sidelobe levels (SLLs) are below -36 dB in the H-plane and below -25 dB in the E-plane with the Gain of 20.3 dB at 9.9 GHz. And for a 16 times 16 antenna, the SLLs are below -30 dB both in the E-plane and H-plane with the Gain of 24.4 dB at 10 GHz. The achieved design goals on the radiation patterns therefore validate the proposed low sidelobe SIW slot array antennas to be valuable candidates for high performance communication and radar applications.
111 citations
TL;DR: In this article, a microfluidic-integrated microwave sensor with potential application in microliter-volume biological/biomedical liquid sample characterization and quantification is presented, which is designed based on the resonance method, providing the best sensing accuracy, and implemented by using a substrate integrated-waveguide structure combining with a rectangular slot antenna operating at 10 GHz.
Abstract: A novel microfluidic-integrated microwave sensor with potential application in microliter-volume biological/biomedical liquid sample characterization and quantification is presented in this paper. The sensor is designed based on the resonance method, providing the best sensing accuracy, and implemented by using a substrate-integrated-waveguide (SIW) structure combining with a rectangular slot antenna operating at 10 GHz. The device can perform accurate characterization of various liquid materials from very low to high loss, demonstrated by the measurement of deionized water and methanol liquid mixtures. The measured relative permittivity, which is the real part of complex permittivity, ranges from 8.58 to 66.12, which is simply limited by the choice of test materials available in our laboratory, not any other technical considerations of the sensor. The fabricated sensor prototype requires a very small liquid volume of less than 7 $\mu \text{L}$ , while still offering an overall accuracy of better than 3%, as compared with the commercial and other published works. The key advantages of the proposed sensor are that it combines: 1) a very low-profile planar and miniaturized structure sensing microliter liquid volume; 2) ease of design and fabrication, which makes it cost-effective to manufacture; and 3) noninvasive and contactless measurements. Moreover, since the microfluidic subsystem can potentially be detached from the SIW microwave sensor and, afterward, replaced by a new microfluidic component, the sensor can be reused with no life-cycle limitation and without degrading any figure of merit.
66 citations
TL;DR: In this article, a dual-slot feeding structure is used in the design of a two-layer E-band substrate integrated array antenna to realize the wideband or dual-band characteristic.
Abstract: A dual-slot feeding structure is used in the design of a two-layer E-band substrate integrated array antenna to realize the wideband or dual-band characteristic. Several metallic vias, which are equivalent to open-ended air-filled circular waveguides, are fabricated through printed circuit board process to form wideband radiating elements. They are fed by a parallel substrate integrated waveguide (SIW) feeding network underneath these radiating elements to obtain a compact configuration. First of all, a single antenna element is modeled and investigated to recognize the characteristics of the feeding dual-slot and the radiation via. Then, a 16×16 high-gain wideband array antenna is fabricated. Its measured |S
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|<;-10 dB bandwidth is 10.5%, and measured realized gain is in the range of 28.2-30.7 dBi within the same bandwidth. Maximal total radiation efficiency is measured to 61.7%. After that, a dual-band 8 8 array antenna is designed and fabricated as well. Its measured |S
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|<;-10 dB bandwidths are 70.6-72.4 GHz and 80.8-82.2 GHz, and measured realized gains are 24.2-25.2 dBi and 24.6-25.8 dBi, respectively. Maximal total radiation efficiency is measured to 72.4%. Considering its wide-band, high-gain and compact configuration, this type of substrate integrated antenna array presents an excellent candidate for E-band multi-gigahertz capacity wireless communication systems.
59 citations
TL;DR: In this paper, a cavity-backed modified dumbbell-shaped slot antenna based on a substrate integrated waveguide technology is proposed, which not only introduces several new resonant points, but also makes the antenna obtain a higher gain.
Abstract: A cavity-backed modified dumbbell-shaped slot antenna based on a substrate integrated waveguide technology is proposed in this letter. Compared with the traditional dumbbell-shaped slot, the modified dumbbell-shaped slot not only introduces several new resonant points, but also makes the antenna obtain a higher gain. In addition, the high-order resonant modes (TE102, TE301, TE302) inside the subcavity are excited by the ground coplanar waveguide feeding structure, and the broadband impedance bandwidth can be achieved by making the high-order modes close to each other. The measured results show that the proposed antenna achieves an impedance bandwidth of 26.7% from 18.2 to 23.8 GHz and a peak gain of 9.5 dBi at 20.4 GHz. The cross-polarization levels of the antenna are around –40 dB at three measured frequencies.
58 citations
Cites background from "Integrated waveguide slot antennas"
...In [5], [6], the coupling between the slots with different lengths enables the antenna to achieve an impedance bandwidth...
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TL;DR: In this paper, a dual-slot antenna etched on a substrate integrated waveguide is proposed to operate at the X-band using two unequal slots in order to increase the bandwidth.
Abstract: This letter presents a dual-slot antenna etched on a substrate integrated waveguide. This antenna is designed, fabricated, and measured to operate at X-band. It uses two unequal slots in order to increase the bandwidth. The measured results show a bandwidth of 8.5%, which is twice that of the standard dual-slot antennas. Attractive features including low cost, compact size, and planar form make this antenna easy to integrate within microwave planar circuits.
46 citations
Cites background from "Integrated waveguide slot antennas"
...rectangular dual-slot [3]–[5], the V-shaped slot, and the banana-shaped slot antennas [6]....
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...According to [5], a bandwidth of 360 MHz is achieved using a dual-slot antenna....
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References
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TL;DR: In this paper, a planar platform is developed in which the microstrip line and rectangular waveguide are fully integrated on the same substrate, and they are interconnected via a simple taper.
Abstract: Usually transitions from microstrip line to rectangular waveguide are made with three-dimensional complex mounting structures. In this paper, a new planar platform is developed in which the microstrip line and rectangular waveguide are fully integrated on the same substrate, and they are interconnected via a simple taper. Our experiments at 28 GHz show that an effective bandwidth of 12% at 20 dB return loss is obtained with an in-band insertion loss better than 0.3 dB. The new transition allows a complete integration of waveguide components on substrate with MICs and MMICs.
1,631 citations
Book•
01 Jan 1949
TL;DR: This book discusses microwave antenna design problems, circuit relations, reciprocity theorems, and antenna measurements - techniques.
Abstract: * Chapter 1: Survey of microwave antenna design problems * Chapter 2: Circuit relations, reciprocity theorems * Chapter 3: Radiation from current distributions * Chapter 4: Wavefronts and rays * Chapter 5: Scattering and diffraction * Chapter 6: Aperture illumination and antenna patterns * Chapter 7: Microwave transmission lines * Chapter 8: Microwave dipole antennas and feeds * Chapter 9: Linear-array antennas and feeds * Chapter 10: Waveguide and horn feeds * Chapter 11: Dielectric and metal-plate lenses * Chapter 12: Pencil-beam and simple fanned-beam antennas * Chapter 13: Shaped-beam antennas * Chapter 14: Antenna installation problems * Chapter 15: Antenna measurements - techniques * Chapter 16: Antenna measurements - equipment
1,504 citations
TL;DR: In this paper, a waveguide of new structure has been developed for millimeter-wave applications, which can be embedded in a substrate and is able to be wired in three dimensions, and its transmission characteristics are evaluated using a glass-ceramic substrate of dielectric constant, /spl epsiv/sub r/=5, and loss, tan /spl delta/=0.0008.
Abstract: A waveguide of new structure has been developed for millimeter-wave applications. The dielectric waveguide is constructed with sidewalls consisting of lined via-holes and edges of metallized planes. This structure can be manufactured by lamination techniques, so we refer to the waveguide as a "laminated waveguide". The laminated waveguide can be embedded in a substrate and is able to be wired in three dimensions. The transmission characteristics are evaluated using a glass-ceramic substrate of dielectric constant, /spl epsiv//sub r/=5, and loss, tan /spl delta/=0.0008. Insertion loss per unit length of the guide is estimated to be less than 0.5 dB/cm at 83 GHz. Furthermore, it was confirmed that the laminated waveguide is suitable to feeding lines for a small sized plane array antenna. By electromagnetic simulation, it has been confirmed that fundamental structures, such as bends, branches, power dividers, and interconnections between upper and lower layers can be realized with sufficient performances.
493 citations
TL;DR: In this paper, a dielectric-filled metal-pipe rectangular waveguide has been fabricated using photo-imageable thick-film materials, which incorporated a new transition from CPW-to-TFMS-to MPRWG.
Abstract: A novel dielectric-filled metal-pipe rectangular waveguide has been fabricated using photoimageable thick-film materials. The waveguides incorporate a new transition from CPW-to-TFMS-to-MPRWG. Standard on-wafer measurement techniques, waveguide STD calibration standards, demonstrated low attenuation across the 60 to 90 GHz frequency range.
50 citations