Substrate Integrated Waveguide (SIW) cavity backed slot antenna for polarization diversity application
01 Dec 2015-pp 1-2
TL;DR: In this paper, the authors proposed a cavity-backed slot antenna for polarization diversity using a pair of slots placed at right angle with respect to each other at the top metallic plate of the cavity to generate two linear orthogonally polarized radiation patterns at same frequency to implement polarization diversity technique.
Abstract: In this paper, a design of Substrate Integrated Waveguide (SIW) cavity backed slot antenna for polarization diversity application is presented. The proposed design uses a pair of slots placed at right angle with respect to each other at the top metallic plate of the cavity to generate two linear orthogonally polarized radiation pattern at same frequency to implement polarization diversity technique. The antenna interchanges between two separate feed line to excite either of the two orthogonal modes TE120 and TE210 respectively at same frequency and as a result, the proposed antenna exhibits a radiation pattern switching between Vertical (VP) and Horizontal Polarization (HP) at 9.98 GHz. The simulated result of the proposed design shows an isolation better than 20 dB between two input port and a gain of 4.2 dBi at broadside direction.
Citations
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TL;DR: Two types of substrate integrated waveguide (SIW) cavity-backed slot (CBS) antennas are proposed for bandwidth enhancement using a quad-resonance SIW CBS antenna using a cross-shaped slot and loading unbalanced shorting vias.
Abstract: Two types of substrate integrated waveguide (SIW) cavity-backed slot (CBS) antennas are proposed for bandwidth enhancement. First, a quad-resonance SIW CBS antenna is proposed using a cross-shaped slot and loading unbalanced shorting vias. Additional half- $\textrm {TE}_{120}$ mode is successfully excited along with three other independent modes including half- $\textrm {TE}_{110}$ and odd and even $\textrm {TE}_{210}$ modes. Next, a penta-resonance SIW CBS antenna with a cross-shaped slot is proposed, in which two pairs of shorting vias are loaded. Two additional hybrid modes of half- $\textrm {TE}_{210}$ and half- $\textrm {TE}_{120}$ modes are introduced along with three other independent modes including half- $\textrm {TE}_{110}$ and odd and even $\textrm {TE}_{310}$ modes. Furthermore, the working mechanism of these two types of SIW CBS antennas is explained. Finally, prototypes of these two antennas are fabricated and measured at X -band. Their measured fractional bandwidths are $\text{20.0}\%$ and $\text{20.8}\%$ , respectively. Simulation and measurement results agree very well, which confirms the validity of the proposed designs.
43 citations
Cites methods from "Substrate Integrated Waveguide (SIW..."
...Different from the dual-fed geometry in [2], here, by applying the cross-shaped slot and the unbalanced shorting vias, four separated modes are introduced...
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TL;DR: In this article, a dual slant polarized antenna for millimeter-wave (mmWave) base stations is proposed, which offers the advantages of high cross-polarization discrimination (XPD), good aperture efficiency, simple structure, and low profile.
Abstract: This article presents a novel dual slant polarized antenna for millimeter-wave (mmWave) base stations. Compared with the traditional slant polarized mmWave antennas, the proposed antenna offers the advantages of high cross-polarization discrimination (XPD), good aperture efficiency, simple structure, and low profile. The corner-fed substrate integrated waveguide (SIW) cavity is adopted to improve the port isolation and XPD of this slot-coupled antenna. Four corner-truncated patches connected by a thin cross strip are placed over the SIW cavity to increase the operation bandwidth. Then, a $2\times 8$ antenna array is designed to exemplify the antenna element performance. To improve the impedance matching, a shorted patch is introduced in designing the series feeding network and the power divider. The experimental results show that the 2 dB-down gain bandwidth of the proposed antenna array reaches 6.0% and the port isolation is better than 20 dB. The gain and XPD of the antenna array measure 16.7 dBi and 25 dB at the center frequency, respectively.
33 citations
Cites background from "Substrate Integrated Waveguide (SIW..."
...3(b), to achieve ±45◦ dual slant polarization, the overall structure of the reference antenna is 45◦ tilted away from the y-axis [30]....
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TL;DR: In this paper, a dual-polarized cavity-backed bow-tie slot arrays are designed and integrated on the frame of the mobile handset for high coverage area and high gain.
Abstract: In this letter, dual-polarized cavity-backed bow-tie slot arrays are designed and integrated on the frame of the mobile handset. The bandwidth is firstly enhanced for the cavity-backed slot antenna using hybrid modes, with a wide band of 4.1 GHz achieved by dual resonances. However, the hybrid modes result in poor isolation between the orthogonally placed antennas, and a tradeoff between bandwidth and mutual coupling is made, which provides an isolation of above 13 dB between the ports. Two antenna arrays, with each composed of four dual-polarized cavity-backed slot units, are then utilized on the longer metal frames of the handset. The scanning beamwidth for each array is 138° for the gain of above 7 dBi. The 3-D coverage efficiency of the antenna reaches 52% for a threshold gain of 5 dBi. Thus large coverage area and high gain are achieved simultaneously by the dual-polarized frame integrated slot arrays. The proposed antenna arrays are suitable for mobile handsets for their simple structure, high integration, dual polarizations, high gain, and large coverage area.
16 citations
TL;DR: In this article, the authors examined a cavity-backed circularly polarized diversity antenna, where a parasitic patch and reconfigurable diodes are used to change polarization diversity from left hand to right hand and vice versa.
Abstract: This article examines a substrate integrated waveguide (SIW) cavity-backed circularly polarized diversity antenna. In the proposed novel antenna, parasitic patch and reconfigurable diodes are used to change polarization diversity from left hand to right hand and vice versa, respectively. In addition to, what makes distinctive proposed antenna in compared with similar works, is ability to change linear polarization from a SIW slot to circularly polarization by a parasitic patch. Chopping off two diagonally opposite corners makes the resonance frequency of the mode along this diagonal to be higher than that for the mode along the unchopped diagonal. By exciting parasitic patch with a slot along axes of it the orthogonal modes are generated which causes to CP. The comparison between simulation and measurement results validate antenna design. The measured impedance BW (VSWR < 2) for state 1 and 2 are 22.18% (11.86-14.82 GHz) and 21.68% (11.88-14.77 GHz), and The measured 3-dB AR BW for states 1 and 2 are about 11.46% (11.43-12.82 GHz) and 11.23% (11.43-12.79 GHz), respectively. Finally, the measured maximum gain is 9.81 dBic.
4 citations
References
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TL;DR: In this article, the authors provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components, as well as their application in the development of circuits and components operating in the microwave and millimetre wave region.
Abstract: Substrate-integrated waveguide (SIW) technology represents an emerging and very promising candidate for the development of circuits and components operating in the microwave and millimetre-wave region. SIW structures are generally fabricated by using two rows of conducting cylinders or slots embedded in a dielectric substrate that connects two parallel metal plates, and permit the implementation of classical rectangular waveguide components in planar form, along with printed circuitry, active devices and antennas. This study aims to provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components.
1,129 citations
"Substrate Integrated Waveguide (SIW..." refers background in this paper
...In recent years, Substrate Integrated Waveguide (SIW) technology has become popular among the researchers which implements non planar waveguide based circuits in planar substrate by using rows of metallic vias [1]....
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TL;DR: In this paper, a low profile cavity backed planar slot antenna has been described, which is completely constructed at a single substrate by using substrate integrated waveguide technique and grounded coplanar waveguide.
Abstract: A novel design method of low profile cavity backed planar slot antenna has been described in this paper. The whole antenna including backed cavity and feeding element is completely constructed at a single substrate by using substrate integrated waveguide technique and grounded coplanar waveguide. An example with 1.7% bandwidth has been presented, which has 5.4 dBi gain, 16.1 dB front-to-back ratio and -19 dB maximum cross polarized radiation level with its total thickness less than lambda0/50. The proposed antenna keeps good radiation performance of conventional cavity backed antenna and has advantages of conventional planar antenna including low profile, light weight, easy fabrication with low cost and convenient integration with planar circuit.
402 citations
TL;DR: In this article, a single-fed low profile cavity backed crossed slot antennas for dual frequency dual linear polarization and circular polarization applications are proposed by employing the substrate integrated waveguide (SIW) technique in the antenna designs.
Abstract: Single fed low profile cavity backed crossed slot antennas for dual frequency dual linear polarization and circular polarization applications are first presented in this paper. By employing the substrate integrated waveguide (SIW) technique in the antenna designs, the low profile backed cavity structure can be realized by using only a single layer of low cost printed circuit board (PCB) substrate. A single grounded coplanar waveguide (GCPW) is employed as the feeding element to excite the TE 120 and TE 210 modes in the SIW cavity. A crossed slot structure is used as the radiating element in order to radiate the desired dual linearly or circularly polarized wave. From the measurement results, it is seen that these novel antennas retain the advantages of conventional metallic cavity backed antennas, including high gain, high front-to-back ratio (FTBR), and low cross polarization level (CPL). Furthermore, the proposed antennas also possess the advantages of low profile, light weight, low fabrication cost, and easy integration with planar circuits.
263 citations
"Substrate Integrated Waveguide (SIW..." refers background in this paper
...Design of SIW cavity backed dual frequency dual polarized slot antenna is discussed in [6]....
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TL;DR: In this article, a bow-tie-shaped slot antenna is proposed to induce strong loading effect in the cavity and generate two closely spaced hybrid modes that help to get a broadband response.
Abstract: A novel design technique for broadband substrate integrated waveguide cavity-backed slot antenna is demonstrated in this letter. Instead of using a conventional narrow rectangular slot, a bow-tie-shaped slot is implemented to get broader bandwidth performance. The modification of the slot shape helps to induce strong loading effect in the cavity and generates two closely spaced hybrid modes that help to get a broadband response. The slot antenna incorporates thin cavity backing (height <;0.03λ
0
) in a single substrate and thus retains low-profile planar configuration while showing unidirectional radiation characteristics with moderate gain. A fabricated prototype is also presented that shows a bandwidth of 1.03 GHz (9.4%), a gain of 3.7 dBi over the bandwidth, 15 dB front-to-back ratio, and cross-polarization level below -18 dB.
152 citations
01 Oct 2002
TL;DR: In this article, a substrate integrated waveguide (SIW) cavity directly coupled to a planar circuit, i.e., a microstrip line or coplanar waveguide, is presented.
Abstract: A substrate integrated waveguide (SIW) cavity directly coupled to a planar circuit, i.e. microstrip line or coplanar waveguide, is presented. Different coupling topologies and coupling probes are discussed. Empirical equations to predict the resonance frequencies of the cavity are provided. A temperature stability coupling topology were fabricated and measured. Finally, as an example of potential applications, a filter using two SIW cavities was designed and measured.
110 citations
"Substrate Integrated Waveguide (SIW..." refers methods in this paper
...orthogonal modes TE120 and TE210 at same frequency in X band following the design guideline as stated in [10]....
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