Dual-Band Half Mode Substrate Integrated Waveguide Filter With Independently Tunable Bands

IET Microwaves, Antennas & Propagation

Bouazizi

Smida³

et al. 2019

Self Cite

In this study, a dual‐band pattern‐reconfigurable monopole antenna is designed and experimentally validated for C‐band satellite communication systems and sensing UWB‐radar applications. The proposed antenna has three resonances at 3, 7 and, 8.5 GHz. To incorporate the reconfigurability, two switches are applied in the ground plane to reshape the radiation pattern and focus the radiated power in the desired direction. Thus, the desired beam from the antenna can be obtained by adjusting the states of the switches. The proposed antenna has good impedance matching (S11<−10thinmathspacedB for both operating bands), reasonable gain (>4.1 dBi), and high efficiency (>83%) for all switching states. A good agreement is observed between the simulated and measured results.

Section: Antenna Design Methodologymentioning

confidence: 99%

Low‐profile dual‐band antenna with on‐demand beam switching capabilities

IET Microwaves, Antennas & Propagation

Bouazizi

Smida³

et al. 2019

Self Cite

“…The K 12 is inversely related to the gap between the resonators ( S 1 ) and directly related to the length of the high impedance region ( S 3 ). Coupling matrices of the filter at the biasing voltage of 0, 2, and 30 V are generated, 2 as illustrated in Figure 6.…”

Section: Single‐ended Bandpass Tunable Filtermentioning

confidence: 99%

“…Reconfigurable and tunable bandpass filters play a vital role in modern wireless communication RF front‐ends, because of their ability to adjust the passband in one circuit according to requirements, using some tunability schemes 1,2 . The varactor diode, with its small size, low cost, and fast tuning, is superior to all other tuning technologies 3‐5 …”

Section: Introductionmentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Int J RF Microw Comput Aided Eng

Smida

Waly

et al. 2021

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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.

“…A wideband filter with high selectivity, low insertion loss, light weight, high quality factor, and high power handling capability is the key component for future wideband communication systems [ 1 , 2 ]. The substrate integrated waveguide (SIW) possesses most of the above requirements [ 3 , 4 ]. The operational principle of SIW is identical to a bulky waveguide, but SIW is a planar circuit, unlike a conventional waveguide.…”

Section: Introductionmentioning

confidence: 99%

Multimode HMSIW-Based Bandpass Filter with Improved Selectivity for Fifth-Generation (5G) RF Front-Ends

Tiang

Wong

et al. 2020

Sensors

Self Cite

This article presents the detailed theoretical, simulation, and experimental analysis of a half-mode substrate integrated waveguide (HMSIW)-based multimode wideband filter. A third-order, semicircular HMSIW filter is developed in this paper. A semicircular HMSIW cavity resonator is adopted to achieve wide band characteristics. A U-shaped slot (acts as a λ/4 stub) in the center of a semicircular HMSIW cavity resonator and L-shaped open-circuited stubs are used to improve the out-of-band response by generating multiple transmission zeros (TZs) in the stop-band region of the filter. The TZs on either side of the passband can be controlled by adjusting dimensions of a U-shaped slot and L-shaped open-circuited stubs. The proposed filter covers a wide fractional bandwidth, has a lower insertion loss value, and has multiple TZs (which improves the selectivity). The simulated response of filter agrees well with the measured data. The proposed HMSIW bandpass filter can be integrated with any planar wideband communication system circuit, thanks to its planar structure.