Design of a Substrate Integrated Coaxial Line based Dual Beam 6x4 Double Slot Antenna Array for Millimeter Wave Application
01 Oct 2019-pp 1440-1443
TL;DR: A compact and low-profile dual beam slot antenna array operating at millimetre wave frequency using Substrate Integrated Coaxial Line (SICL) technology and suitable for broadside applications is presented.
Abstract: In this paper, a compact and low-profile dual beam slot antenna array operating at millimetre wave frequency is presented. A 6x4 C-shaped slot antenna array has been designed using Substrate Integrated Coaxial Line (SICL) technology. The feeding section of the array is SICL based one to four way power divider that feeds the four 6x1 antenna subarray. The placement of the slot disturbs the surface current in the outer conductor which excites it to radiate in free space. The width of the SICL is much less than $\boldsymbol{\lambda}_{\mathbf{g}}/2$ , this makes SICL compact as compared to other feeding networks, low profile and suitable for broadside applications. The proposed 6x4 C-shaped slot antenna array operates at 25.16 GHz with 3 dB beamwidth of 46° and provides a gain of 9.87 dBi. This antenna is particularly suitable for cost effective solution for multi user communication at millimetre wave frequency.
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29 May 2022
TL;DR: In this paper , the authors presented step by step novel technique to improve the Front to Back Ratio (FTBR) of Substrate Integrated Coaxial Line (SICL) based cavity backed slot antenna.
Abstract: This paper presents step by step novel technique to improve the Front to Back Ratio (FTBR) of Substrate Integrated Coaxial Line (SICL) based cavity backed slot antenna (CBSA). The design consists of three linear 45° inclined slot etched on the bottom plate of cavity. The proposed slot configuration excites ${\text{TE}}_{110(odd)}^z$ mode which helps the proposed three λg/4 slots to radiate in a unique way such that a higher order mode $\operatorname{TE} _{110(odd)}^z$ is excited and the surface current is disturbed by the proposed slot configuration which results in electromagnetic radiations. The novelty of the work lies in exciting the slot antenna with new higher order cavity mode to get better FTBR. The proposed antenna exhibits measured FTBR of 25 dB and gain of 4.2 dBi with co-pol to cross-pol ratio of 17 dB. This novel method is the simplest known low profile technique that efficiently utilizes SICL cavity modes to improve FTBR while maintaining compactness of the antenna design.
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TL;DR: In this paper, a dual frequency SICL-based Cavity Backed Slot Antenna (CBSA) is proposed for millimetre wave band 5G spectrum coverage for customer premises equipments.
Abstract: This paper presents a compact dual frequency Substrate Integrated Coaxial Line (SICL) based Cavity Backed Slot Antenna (CBSA). A primary slot along with secondary slot is etched on the bottom plate of SICL cavity to generate two non-adjacent resonant frequencies. The primary slot is placed such that it is excited by ${\text{TE}}_{110(even)}^x$ mode of the SICL cavity. The secondary slot is placed near the primary slot and excited by the SICL feed line. At second resonance, SICL cavity acts as the reflector for the back radiation and significantly improves front to back ratio (FTBR). The size of the proposed SICL cavity backed slot antenna is found to be compact in comparision with other technologies based design including Substrate Integrated Waveguide (SIW) cavity backed antennas proposed earlier. The antenna resonates at 24 GHz and 38 GHz with gain of 5.1 dBi and 4.8 dBi, exhibiting high FTBR of 14 dB and 28 dB with co to cross polarization ratio of -22 dB and -32 dB respectively. This antenna finds its application in millimetre wave band 5G spectrum coverage for customer premises equipments (CPE).
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TL;DR: In this article , a half-mode SICL cavity is bisected along its symmetric magnetic wall (PMC) to create an open-ended Half Mode Substrate Integrated Coaxial Line (HMSICL) cavity.
Abstract: In this paper, we propose a novel Half Mode Substrate Integrated Coaxial Line (HMSICL) cavity fed monopole antenna at 28 GHz. A SICL cavity is bisected along its symmetric magnetic wall (PMC) to create an open-ended Half Mode SICL (HMSICL) cavity. The proposed HMSICL cavity is used to excite a tapered monopole antenna to radiate in endfire direction with a gain of 6.4 dBi at 28 GHz. For dual beam application, it is integrated with unidirectional broadside Half Mode Substrate Integrated Waveguide (HMSIW) antenna exhibiting a gain of 5.1 dBi that provides spatial diversity to the proposed design. To achieve high gain, two co- located $1\times 4$ linear HMSICL and HMSIW array are placed side-by-side such that the proposed design produces simultaneous endfire and broadside beams for In-Band Full Duplex (IBFD) applications. The proposed passive Signal Interference Cancellation (SIC) technique is utilized to minimize the overlap of simultaneous dual beam at 28 GHz by orienting the two antennas within a compact footprint. The full duplex antenna array achieves a gain of 10.8 dBi in endfire and 10.3 dBi in broadside direction with high isolation below 45 dB over 500 MHz bandwidth. The presented antenna array is a potential candidate for relay where the transmitting and receiving signals are in two different directions.
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