Complex beam steering from substrate integrated waveguide leaky wave antenna array

This article introduces a wideband composite antenna with end‐fire radiation. The structure is achieved by uniting a center‐fed microstrip shorted patch and a parasitical monopole. The monopole is vertical to the substrate and work as an electric current source. Because the loaded monopole breaks the symmetry of the center‐fed microstrip antenna, the original patch antenna can work as in‐phase equivalent magnetic current sources radiation. Then complementary sources are generated by orthometric magnetic current source and electric current source. The typical unidirectional radiation capacity has a good endfire beam. The loaded monopole adds a resonant mode to the original microstrip antenna, which makes the composite microstrip‐monopole antenna to exhibit an enhanced bandwidth of 26.9% and an average gain of 7.5 dBi. The complementary sources radiation mechanism can generate special unidirectional radiation patterns in a compact space, so this antenna type is an excellent candidate for array applications. The prototype's planar size is only 0.36λ0 × 0.39λ0 (λ0 is the free space wavelength in center frequency). The eight elements phased array with the proposed antenna show perfect simulated scanning performance.

Section: Introductionmentioning

confidence: 99%

Design of wideband end‐fire composite microstrip‐monopole antenna

Yang

Liu

et al. 2021

“…On the other hand, in recent years, the substrate integrated waveguide (SIW) structures have been used widely in both articles and industry considering to ease of construction, low cost, planar structure, and their advantages over other transmission lines . Due to the advantages of this type of waveguide, using them in designing and manufacturing LWAs and power dividers has become very common in recent years …”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11] Due to the advantages of this type of waveguide, using them in designing and manufacturing LWAs and power dividers has become very common in recent years. [12][13][14][15][16] Actually, the LWAs are two-port structures where the wave leaks outward through the structure, from the input port to the output port and forms the antenna radiation pattern. The scanning angle of the LWAs is depended on the β (the leaky-mode phase constant) and k 0 (free space wave number) and can be obtained from the Equation (1):…”

Section: Introductionmentioning

confidence: 99%

Compact bilayer substrate integrated waveguide leaky wave antenna with dumbbell‐shaped slot based on the TE ₂₀ mode

Abolfathi

Rezaei

Sharifi

2019

In this article, a compact dual layer leaky wave antenna array is simulated and constructed using the substrate integrated waveguide (SIW) based on the TE20 mode at the X‐ and Ku‐bands. The proposed antenna is designed by creating dumbbell‐shaped slots on the upper layer of the SIW. These slots have increased the antenna bandwidth so that the proposed antenna has a bandwidth of 9.5 to 13.7 GHz and a fractional bandwidth of 36%. In addition, to excite the TE20 mode, an SIW power divider is used in the feeding network of the antenna located in the bottom layer. Moreover, the gain and directivity are other advantages of the proposed antenna so that at 12.5 GHz the antenna peak gain reaches to 15.7 dB. Antenna beam scanning angle is from 5° to 81°. This antenna is simulated and analyzed by the CST Microwave Studio software. The obtained results from the antenna test lab confirm the simulation results.

“…A myriads of CRLH LWA structures based on SIW have been proposed in the literature. [6][7][8][9][10][11][12] With the CBS achieved in CRLH based LWAs (P < λ g /4), researchers shift their focus to periodic LWAs (P~λ g ) for solving the problem of open stop band. This open stop band problem arises because of the standing wave formation at the broadside frequency.…”

Section: Introductionmentioning

confidence: 99%

“…SIW technology is also combined with CRLH for the design of LWAs providing CBS. A myriads of CRLH LWA structures based on SIW have been proposed in the literature . With the CBS achieved in CRLH based LWAs ( P < λ g /4), researchers shift their focus to periodic LWAs ( P ~ λ g ) for solving the problem of open stop band.…”

Section: Introductionmentioning

confidence: 99%

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

Belwal

Agrawal

Gupta

2018

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.