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Proceedings ArticleDOI

CRLH based leaky-wave antenna using modified Minkowski fractal on SIW with tunable frequency band

TL;DR: In this paper, a composite right/left-handed (CRLH) based frequency tunable compact high gain leaky-wave antenna (LWA) is proposed at Ku-band.
Abstract: In this paper, a composite right/left-handed (CRLH) based frequency tunable compact high gain leaky-wave antenna (LWA) is proposed at Ku-band. For miniaturization purpose, the modified Minkowski fractal geometry is utilized and by incorporating with suitably placed varactor diodes, the frequency tunable leaky-wave antenna is designed in planar environment. By changing the position of varactor diodes the operating frequency range of the antenna is shifted from 15–16.2 GHz to 14–15 GHz with the beam scanning range of 32° and 30° respectively. The obtained peak gain is 16.7 dBi. Full-wave simulations are performed in HFSS.
Citations
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Journal ArticleDOI
TL;DR: In this article , the resonant frequency of a substrate integrated waveguide (SIW) slot antenna is tuned by using cylindrical rods of different dielectric materials in the air holes.
Abstract: This paper presents a novel passive tuning technique to mechanically tune the resonant frequency of a substrate integrated waveguide (SIW) slot antenna, by using cylindrical rods of different dielectric materials in the air holes. A full-wave 3-dimensional Electromagnetic simulator software is used to estimate tunability in the resonant frequency of the SIW slot antenna, which is then analysed using its equivalent circuit, and then verified experimentally. Tunability is obtained by changing relative permittivity of dielectric rods. Measurements show good frequency tunability even with a limited number of dielectric rods and gains over 5 dBi. The similarity in the radiation patterns with tuning, demonstrates a good characteristic for tunable antennas. The technique is simple but effective and does not require external direct current bias circuitry, which removes parasitic effects and less power consumption. The low field perturbation of dielectric rods provides better loss performance and a higher Q-factor over a wider bandwidth. The initial design demonstrates a cost-effective tuning technique achieving return loss (>10 dB) in the X-band. This technique is also suitable for practically overcoming the performance deviation due to fabrication inaccuracies and temperature variation.

2 citations

Proceedings ArticleDOI
01 Aug 2019
TL;DR: In this paper, a composite right/left handed (CRLH) leaky-wave antenna based on SIW is proposed, which can achieve a zero-crossing wide-angle scan from −63 to +40 degrees in a frequency band from 13 GHz-17.6 GHz and the gain in most of the frequency band is higher than 10 dBi, the highest gain is 12.9 dBi.
Abstract: In this paper, a novel design of Composite Right/Left Handed (CRLH) leaky-wave antenna based on Substrate Integrated Waveguide (SIW) is proposed. Due to the special properties of the CRLH structure, the antenna can achieve a zero-crossing wide-angle scan from −63 to +40 degrees in a frequency band from 13 GHz-17.6 GHz, and the gain in most of the frequency band is higher than 10 dBi, the highest gain is 12.9 dBi. The antenna structure is further expanded to a fixed-frequency beam-scanning leaky-wave antenna by loading two varactors in the structure, and the modified antenna can achieve a fixed-frequency scanning from −28 to +22 degrees at 16 GHz.

1 citations


Cites background from "CRLH based leaky-wave antenna using..."

  • ...In [3] and [4], CRLH structures in the top layer of SIW are designed to achieve a zero-crossing scanning; But these designs have shortcomings in scan range....

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References
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Journal ArticleDOI
TL;DR: In this article, a multilayer frequency selective surface (FSS) with subwavelength fractal elements based on the antenna-filter antenna (AFA) concept is proposed.
Abstract: A multilayer frequency selective surface (FSS) with subwavelength fractal elements based on the antenna-filter- antenna (AFA) concept is proposed in this paper. The upper fractal patches are inductive and non-resonant, and the fractal slots on the ground provide a capacitance. The thin substrate is equivalent to a transformer and some resonant modes are produced. Multiple transmission poles are obtained by cascading multilayer two-dimensional periodic structure array of the fractal patches and slots on the ground. The cell periods along $x$ and $y$ directions are the same and the total height is 8 mm, and the fractional bandwidth reaches 30% at normal incidence. To analyze and understand the operating mechanism of the FSS, the equivalent circuit model (ECM) is proposed to analyze the transmission and reflection characteristics. The results of the synthesis from ECM agree well with the results of full-wave simulation. The multilayer AFA-FSS has been manufactured and measured to verify the effectiveness and correctness of the design and synthesis. The simulated results are in good agreement with the tested ones.

100 citations


"CRLH based leaky-wave antenna using..." refers background in this paper

  • ...Fractal is a recursively generated structure having self-similar shape, which means that some of the parts have the same geometrical shape as the whole object but at different scale [1]....

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Journal ArticleDOI
TL;DR: In this paper, a composite right/left-handed substrate integrated waveguide (SIW)-based leaky wave antenna (LWA) is proposed, where square-ring-slot radiators are adopted to introduce series capacitor as well as the energy leakage, and four grounded vias within the slot ring contribute to part of the shunt inductor.
Abstract: A novel composite right/left-handed substrate integrated waveguide (SIW)-based leaky wave antenna (LWA) is proposed. Square-ring-slot radiators are adopted to introduce series capacitor as well as the energy leakage, and four grounded vias within the slot ring contribute to part of the shunt inductor. Moreover, low cross-polarisation levels in the beam scanning plane are achieved due to the differential excitations of the radiators located along the centre line of the SIW working at TE10 mode. The antenna is fabricated and measured. Both simulated and measured results show that the proposed antenna is a balanced LWA operating in the frequency band 13.5-17.8 GHz. Continuous beam scanning characteristic is acquired within the scanning region -57° to +30°. In addition, low cross-polarisation levels less than -27 dB are obtained, and measured results are in good agreement with simulated ones.

34 citations


"CRLH based leaky-wave antenna using..." refers background in this paper

  • ...Several SIW based leakywave antennas have already been proposed in the past literature [2], [3]....

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Proceedings ArticleDOI
01 Jun 2015
TL;DR: In this paper, the authors compared the performance of two-and four-elements SIW-based leaky-wave array antennas and their performance was compared with a 1×4 cascaded SIW power divider with effective matching port.
Abstract: In this paper, 2-elements and 4-elements substrate integrated waveguide (SIW) based leaky-wave array antennas are presented and their performances are compared. The enhanced gain and scan angles for 2-elements are 15.4 dBi and 45° respectively and for 4-elements the same is 18.4 dBi and 30° respectively. In the final design of 4-elements array antenna, sinusoidal variation of slot length is used to reduce the side lobe level (SLL). A 1×4 cascaded SIW power divider with effective matching port is used to feed the antenna. Simulations of the antennas are carried out using HFSS software and presented here.

11 citations


"CRLH based leaky-wave antenna using..." refers background or methods in this paper

  • ...The direction of main radiated beam can be calculated using equation given in [2]....

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  • ...Several SIW based leakywave antennas have already been proposed in the past literature [2], [3]....

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