Wideband High-Selectivity SIW Filtering Antenna with Controllable Radiation Nulls

Wang, Zhongbao; Liu, Xinhong; Liu, Hongmei; Fang, Shaojun

doi:10.1590/2179-10742024v23i1276239

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Article • J. Microw. Optoelectron. Electromagn. Appl. 23 (1) • 2024 • https://doi.org/10.1590/2179-10742024v23i1276239 copy

Wideband High-Selectivity SIW Filtering Antenna with Controllable Radiation Nulls

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A novel wideband high-selectivity substrate-integratedwaveguide (SIW) filtering antenna with controllable radiation nulls is proposed. This antenna is composed of a two-layered SIW resonator, two radiating slots on the top layer, and two coupling slots on the middle layer. A vertical SMA connector is located at the bottom and feeds two SIW cavities simultaneously. By adjusting the parameters of these slots, three radiation nulls will be achieved, and two radiation nulls can be easily controlled. For demonstration, one prototype of the filtering antenna is fabricated and measured. Measurement results show that the fractional bandwidth for |S₁₁| < -10 dB is 8.9% (3.86-4.23 GHz), the gain is 6.08 dBi at center frequency 4.05 GHz, three radiation nulls are achieved at 3.7 GHz, 4.3 GHz, and 5.19 GHz, respectively. The out-of-band skirt selectivities of two sidebands are 150 and 332 dB/GHz, respectively.

Index Terms
controllable radiation null; filtering antenna; high selectivity; substrate integrated waveguide.

References	f₀ (GHz)	FBW (%)	Gain (dBi)	NRN (NCRN)	Lower/Upper Selectivity (dB/GHz)	Size (λg × λg)
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[⁹[9] R. Lovato and X. Gong, “A third-order SIW-integrated filter/antenna using two resonant cavities,” IEEE Antennas Wireless Propag. Lett., vol. 17, no. 3, pp. 505-508, 2018.]	3.71	8.3	5.1	1(1)	74/865	1.4×1.0
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[¹²[12] H. Y. Xie, B. Wu, Y. L. Wang, C. Fan, J. Z. Chen, and T. Su, “Wideband SIW filtering antenna with controllable radiation nulls using dual-mode cavities,” IEEE Antennas Wireless Propag. Lett., vol. 20, no. 9, pp. 1799-1803, 2021.]	5.365	7.6	5.3	2(2)	375/257	1.9×1.6
[¹³[13] H. Chu, C. Jin, J. X. Chen, and Y. X. Guo, “A 3-D millimeter-wave filtering antenna with high selectivity and low cross-polarization,” IEEE Trans. Antennas Propag., vol. 63, no. 5, pp. 2375-2380, 2015.]	31.5	1.6	6.79	2(0)	26/57	3.3×2.5
[¹⁴[14] L. Li, D. Pang, Y. Feng, Q. Wang, and Z. Lei, “A low-profile third-order half-mode SIW filtering antenna with low H- plane cross polarization and good sideband suppression,” IEEE Antennas Wireless Propag. Lett., vol. 18, no. 12, pp. 2503-2507, 2019.]	5.16	2.5	6.79	4(0)	231/213	1.6×1.5
This work	4.05	8.9	6.08	3(2)	150/332	1.1×1.1

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[TFN1] ^*
Lower/upper selectivity is calculated as |α_max - α_min| / |f_z - f_c|, where α_max is the attenuation at the first out-of-band RN or 20 dB attenuation if no RN and α_min is the 3-dB attenuation, f_z and f_c are their corresponding frequencies.