Asymmetric Substrate Integrated Waveguide Leaky Wave Antenna with Open Stop Band Suppression and Radiation Efficiency Equalization through Broadside

Agrawal, Rahul; Belwal, Pravesh; Gupta, S. C.

doi:10.13164/re.2018.0409

Cited by 20 publications

(12 citation statements)

References 21 publications

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“…Balanced symmetry of the structure leads to the variation of gain all over the frequency range shown in Figure . The asymmetry principle can be used to make the gain constant but it will lead to comparatively higher X‐pol levels. The maximum gain achieved for the prototype is 13.8 dB, shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Substrate integrated waveguide leaky wave antenna with low cross polarization in X‐Ku band

Belwal

Agrawal

Gupta

2018

Int J RF Microw Comput Aided Eng

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In this article, a balanced symmetrical low cross polarization (X‐pol) substrate integrated waveguide (SIW) based leaky wave antenna (LWA) is presented. The unit cell of the LWA consists of transverse and longitudinal slots, which provide series and shunt resonant elements, essentially required to radiate at broadside direction efficiently. The radiating slots are arranged in a way such that the unit cell is symmetrical around the centerline so as to achieve the low X‐pol levels. Moreover, the shape of the longitudinal slots are changed and optimized to match the unit cell impedance to the characteristic impedance of the SIW. Parametric constraints of the radiating slots are studied for achieving the continuous beam scanning and the best low X‐pol in the presented LWA. The final presented LWA is capable of continuous beam scanning from −28° to +30° within a frequency range of 9.5‐15.2 GHz including broadside at 12.2 GHz. Moreover, the X‐pol levels are better than −40 dB all over the scanning frequency range. Finally, the antenna prototype is fabricated and tested. Simulated and measured results are in good agreement. The maximum gain of the antenna measured is 13.8 dB.

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Section: Resultsmentioning

confidence: 99%

Substrate integrated waveguide leaky wave antenna with low cross polarization in X‐Ku band

Belwal

Agrawal

Gupta

2018

Int J RF Microw Comput Aided Eng

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“…For the microwave frequency region, different LWA topologies have been studied including rectangular waveguides [43,44], substrate integrated waveguides (SIWs) [26,[45][46][47] or coplanar waveguides (CPWs) [48,49]. However, for the THz frequency region, open guided-wave structures are preferred because of the lower transmission loss [50].…”

Section: A Lwa Designmentioning

confidence: 99%

InP-Based THz Beam Steering Leaky-Wave Antenna

Lü

Haddad

Sievert

et al. 2021

IEEE Trans. THz Sci. Technol.

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For mobile THz applications, integrated beam steering THz transmitters are essential. Beam steering approaches using leaky-wave antennas (LWAs) are attractive in that regard since they do not require complex feeding control circuits and beam steering is simply accomplished by sweeping the operating frequency. To date, only a few THz LWAs have been reported. These LWAs are based on polymer or graphene substrates and thus it is quite impossible to monolithically integrate these antennas with state-of-the-art indium phosphide (InP) based photonic or electronic THz sources and receivers. Therefore, in this paper, we report on an InP-based THz LWA for the first time. The developed and fabricated THz LWA consists of a periodic leaking microstrip line integrated with a grounded coplanar waveguide to microstrip line (GCPW-MSL) transition for future integration with InP-based photodiodes. For fabrication, a substrate-transfer process using silicon as carrier substrate for a 50 µm thin InP THz antenna chip has been established. By changing the operating frequency from 230 GHz to 330 GHz, the fabricated antenna allows to sweep the beam direction quasilinearly from-46° to 42°, i.e. the total scanning angle is 88°. The measured average realized gain and 3 dB beam width of a 1.5 mm wide InP LWA are ~11 dBi and 10°. This paper furthermore discusses the use of the fabricated LWA for THz interconnects. Index Terms-Beam steering, indium phosphide, leaky wave antenna, monolithic integrated circuits, wafer bonding. I. INTRODUCTION ERAHERTZ (THZ) waves feature distinct advantages compared to its neighboring spectra, making this frequency spectrum (0.1-10 THz) very attractive for several applications. THz waves are far less energetic than X-rays, i.e. they are nonionizing for biological tissues and, consequently, are promising for several medical applications [1-4]. Benefiting from the shorter wavelength in contrast to microwaves, THz waves offer a much higher spatial resolution which makes them quite intriguing for high-resolution imaging applications [5, 6]. Beyond the high spatial resolution, most dry dielectric materials are transparent for THz waves, whereas materials with high

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“…The proposed structures are designed using RT/Duroid 5880 substrate with dielectric constant  r = 2.2 and height of 0.787 mm and loss tangent tan δ = 0.0009. The unit cell of the SIW LWA proposed in [16] is converted into HMSIW LWA unit cell by bisecting it through the central line of symmetry. The width for the HMSIW is chosen according to the equations in [6].…”

Section: Antenna Designing and Analysismentioning

confidence: 99%

“…Various structures of composite right/left handed (CRLH) LWAs on the SIW technology have been proposed [9][10][11][12]. In periodic SIW LWAs (P ~ λ g ), the problem of OSB is solved by mainly three techniques, namely, reflection cancellation [13], impedance matching [14] asymmetric technique [15], [16]. However, the frequency-scanning capability of SIW based LWAs is not suitable for more common fixed-frequency applications because of its closed geometry.…”

Section: Introductionmentioning

confidence: 99%

Half Mode Substrate Integrated Waveguide Leaky Wave Antenna with Broadside Gain Enhancement for Ku-Band Applications

Agrawal¹,

Belwal²,

Gupta³

2019

RADIOENGINEERING

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A miniaturized frequency scanned leaky wave antenna (LWA) based on half mode substrate integrated waveguide (HMSIW) with open stop-band suppression is proposed. The modified cross-slot is etched on the top of HMSIW as the radiating element. The folded and unfolded ground plane designs of the proposed HMSIW LWA are compared and analyzed with respect to their Bloch impedance characteristics and it is found that further miniaturization and gain improvement at broadside by ~ 2 dBi are achieved for folded ground plane design. The proposed LWA scans a region from -40° to +24° as the frequency range increases from 12 to 17 GHz with broadside at 15.5 GHz. The HMSIW LWA with folded ground plane is fabricated and its performance is experimentally measured showing the close agreement between the simulation and the measured results. KeywordsMiniaturization, folded ground plane, half mode substrate integrated waveguide, broadside gain enhancement, leaky wave antenna

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Asymmetric Substrate Integrated Waveguide Leaky Wave Antenna with Open Stop Band Suppression and Radiation Efficiency Equalization through Broadside

Cited by 20 publications

References 21 publications

Substrate integrated waveguide leaky wave antenna with low cross polarization in X‐Ku band

Substrate integrated waveguide leaky wave antenna with low cross polarization in X‐Ku band

InP-Based THz Beam Steering Leaky-Wave Antenna

Half Mode Substrate Integrated Waveguide Leaky Wave Antenna with Broadside Gain Enhancement for Ku-Band Applications

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