Low-profile Slotted SIW Cavity Backed Antenna for Frequency Agility

Sboui, Fakher; Macháč, Jan; Gharsallah, Ali

doi:10.13164/re.2019.0386

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…Four varactor diodes (SMV1430‐040LF [0.31‐1.24 pF] from Skyworks) are mounted with the low impedance region of the SIR for tuning. The varactor diodes are connected with a biasing voltage through a current limiting resistor (20 KΩ) and RF chock (0.84 μ H) 31 . The results of the simulated and measured S‐parameters are illustrated in Figure 7.…”

Section: Single‐ended Bandpass Tunable Filtermentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Iqbal

Smida

Waly

et al. 2021

Int J RF Microw Comput Aided Eng

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This paper presents the design of a highly‐tunable single‐ended and balanced filter with improved upper stopband performance. The proposed filters are designed using a spurline and a U‐shaped stepped impedance resonator (SIR) with a varactor diode connected to the open‐circuited end. A spurline is introduced in both designs to achieve wide stopband performance by suppressing the higher‐order modes. The proposed filters have high tunable ranges (single‐ended: 2.35‐3.99 GHz; balanced: 2.39‐4 GHz), low insertion losses (IL) (single‐ended: 0.07‐0.2 dB; balanced: 0.21 to 1.1 dB) and wide upper stopband performance (single‐ended: 3.79f1 with a rejection level higher than 20 dB; balanced: 3.79f1 with a rejection level higher than 20 dB). Performance of both filters are experimentally validated by comparing the experimental results with the simulated ones. Both filters can cover most of the fifth‐generation (5G) wireless communication bands with different biasing voltages (capacitance). When both filters are compared with state‐of‐the‐art filters, the proposed filters are found to achieve high tunable ranges with low IL and wide upper stopband performance.

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Section: Single‐ended Bandpass Tunable Filtermentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Iqbal

Smida

Waly

et al. 2021

Int J RF Microw Comput Aided Eng

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“…A reconfigurable antenna can be used to cover a wide band. In fact, several methods for adding reconfigurability exist, including the use of Varactor diodes [18,19], Pin diodes [20], RF-MEMS microelectromechanical systems [21,22], and agile materials [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Magnetically tuned SIW patch antenna based on nematic liquid crystal for 5G applications and satellite communication systems

Kouki

Sboui

Latrach

2023

Int. J. Microw. Wireless Technol.

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This paper presents a new design of a reconfigurable miscrostrip patch antenna based on a substrate-integrated waveguide (SIW). The antenna is resonant at the millimeter-wave (mmWave) 5G spectrum. The tuning technique consists of using a nematic liquid crystal (K15). An adjustable frequency band from 30.191 to 32 GHz is obtained, giving a tunable range of Δfr = 1.809 GHz. The maximum gain and efficiency reach the values of 7.61 and 9.07 dBi and 93 and 94%, respectively. The proposed SIW antenna loaded with liquid crystal was fabricated and tested. The experimental results correlated well with the simulation; however, the measured reflection coefficient plot shows a shift of the tuning range of 284 MHz, which is an acceptable outcome compared to simulation. A new approach of adopting the magnetic field as a technique to tune the resonance frequency has been used. The structure is characterized by its design simplicity, compactness, and fabrication process. The proposed antenna proves that the liquid crystal improves the performance of the antenna in the Ka band for 5G applications and satellite communication systems.

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