Parasitic Slot Elements for Bandwidth Enhancement of Slotted Waveguide Antennas

Razmhosseini, Maryam; Zabihi, Roshanak; Vaughan, Rodney G.

doi:10.1109/vtcfall.2019.8891329

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…In our design below, we use a cavity 39 depth of a quarter wavelength because such a configuration 40 can readily match to 50 ohms. Theoretical and measured 41 impedance characteristics of multiple slots on cavity waveg-42 uides were studied in 1980 by Paoloni [4], and design proce-43 dures for waveguide slot arrays were published by Elliot, e.g., 44 [5], and for various applications in several later publications, 45 e.g., [6]. However, for beamforming (as opposed to fixed-46 beam designs), the elements must have individual cavities for 47 independent control of the excitation.…”

Section: B Cavity Slot Designmentioning

confidence: 99%

Dual-Slot Cavity Antenna for mm-Wave Beamforming Array

Brar

Vaughan

2022

IEEE Access

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A cavity-fed, dual-slot element and its 4-element linear array configurations for beam-steering applications at 28 GHz are described. The element cavity is formed from rectangular substrate integrated waveguide (SIW), perturbed at one of its corners to excite dual slots for increasing the impedance bandwidth. With a mobile terminal in mind, we look to both classical array principles and to the available theories for finite arrays with mutual coupling, to help guide the design. The impact of the finite ground-plane required to support the slot elements and array is investigated by simulation, including the impact on the patterns of using a cellphone chassis as a platform. A chassis-born 4-element (8 slots) configuration, suitable for beamforming in 28 GHz 5G networks is demonstrated for both linear polarizations. The simulation results are supported by pattern measurements of prototypes, a challenging task at 28 GHz. 48 C. BEAM FORMING ARRAYS 49 Recent designs for multiple cavity-fed slot antennas for 50 beamforming are now summarized. In [7], orthogonally 51 polarized, 2-element arrays at 2.5 GHz were realized using 52 orthogonally oriented slots on adjacent cavities arranged as a 53 VOLUME 10, 2022 This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ From Figure 10(a), for a 4-element array of isotropic 512 elements, the array antenna directivity in a hemisphere has 513 a maximum of 10.7 dBi for an element spacing of 0.8λ 0 . 514 The array action adds 7.7 dB to the hemispheric element 515 directivity of 3 dBi. For the 2-element array, this spacing for 516 maximum directivity is 0.7λ 0 . For this isotropic element case, 517 only the array factor governs the optimum spacings. But for 518 directive elements, it is perhaps not widely understood that 519 the element pattern, featured in (7), also impacts the optimum 520 element spacing for maximum broadside directivity, meaning 521 that the array directivity cannot be separated from the element 522 directivity. 523 For a directive element pattern model using exponents n = 524 m =1, the maximum array antenna directivity of 14.5 dBi is 525 for a spacing of 0.9 λ 0 . This changing spacing for maximum 526 array antenna directivity is from the element patterns acting 527 to suppress grating lobes. The 4-element array action for this 528 spacing adds 6.7 dB to the element directivity of 7.8 dBi.

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Section: B Cavity Slot Designmentioning

confidence: 99%

Dual-Slot Cavity Antenna for mm-Wave Beamforming Array

Brar

Vaughan

2022

IEEE Access

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“…A comparison of the proposed array to the state-of-the-art CP antenna arrays, as well as the last reported techniques to broaden the operating bandwidth of the conventional slotted waveguide, is summarised in Table 3. First, the proposed design has been compared with linear polarized antenna arrays, where advanced techniques have been used to broaden the RLBW [9,[21][22][23]. It has been found that the proposed design RLBW is superior to that of the linear polarized antennas.…”

Section: F I G U R Ementioning

confidence: 99%

“…subarrays to obtain a RLBW of 7.8%. In [23], extra slots have been illustrated instead of a single radiator in order to improve the impedance BW, which contributed to achieve 10.3% RLBW.…”

Section: Introductionmentioning

confidence: 99%

“…10 elements SIW standing wave antenna array which is fed by differential feeding has been illustrated in [22], where the large resonating standing wave antenna is electrically divided into wideband subarrays to obtain a RLBW of 7.8%. In [23], extra slots have been illustrated instead of a single radiator in order to improve the impedance BW, which contributed to achieve 10.3% RLBW.…”

Section: Introductionmentioning

confidence: 99%

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A novel circularly polarized slotted substrate integrated waveguide antenna array for satellite applications

Eid

Salama

Elkamchouchi

2021

IET Microwaves Antenna & Prop

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In this article, three novel slotted substrate integrated waveguide (SIW) antenna elements are demonstrated with different radiator configurations, namely, two arms Archimedean antenna, single-arm spiral antenna (monofilar), and four concentric circular loops antenna. Additionally, their near, as well as far-field characteristics, have been investigated. The two arms Archimedean spiral antenna has a superior radiation characteristic of 18% return loss bandwidth (RLBW), 12% boresight axial ratio bandwidth (ARBW), and five dBi directivity. Furthermore, a 1 � 10 slotted SIW travelling wave antenna array has been designed, fabricated, and measured. The performance of the proposed antenna array versus the last reported antenna was evaluated and the proposed antenna array performance is superior to that of the others. Moreover, the measurements of the proposed array have a good agreement with the simulation results in which, 35%, 13% RLBW, and ARBW, respectively, have been achieved. The directivity of the proposed antenna array is 14 dBi.How to cite this article: Eid AM, Salama AA, Elkamchouchi HM. A novel circularly polarized slotted substrate integrated waveguide antenna array for satellite applications.

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