Substrate integrated waveguide filter based on the magnetized ferrite with tunable capability

Abstract

In this paper, a miniaturized substrate integrated waveguide filter on the magnetized ferrite is presented. The proposed filter has a small size, high power transmission capability, relatively good bandwidth, and tunable frequency bandwidth. This filter is tunable due to the magnetic bias applied to the ferrite substrate. Compared to the tunable filters reported in previous references based on PIN diode, varactors, and mechanical changes, the proposed filter has a relatively wide adjustment on the operation frequency. Using this method dramatically reduces the complexity of the external control system. This tunable filter is optimized using the Ansoft HFSS software and then fabricated. The measured operating frequency of the filter is tunable from 5.3 to 7.15 GHz by changing the magnetic bias from 100 Oe to 1100 Oe. In the frequency range of 5.55 to 6.95 GHz, an insertion loss of less than 1.1 dB and a return loss of better than 20 dB are achieved. A good agreement between the simulation and experimental results was achieved.

Microwave Dual-Crack Sensor with a High Q-Factor Using the TE20 Resonance of a Complementary Split-Ring Resonator on a Substrate-Integrated Waveguide

“…The resonance frequency of the TE 20 -mode SIW was calculated as where and are the substrate permittivity, permeability, mode index, mode index, and effective width and length, respectively. The effective width and length were calculated as where and are the width and length of the SIW, respectively, from the center of the vias, and is the diameter of the vias [ 47 , 74 ]. Based on the SIW, the TE 20 -mode resonant frequency for the SIW loaded with CSRRs can be expressed as where and are the inductance and capacitance of the CSRR as shown in Figure 2 b [ 74 , 75 ], which are determined by Equations (5) and (6), respectively: where and is the capacitance per unit length between the rings [ 76 , 77 , …”

“…In this paper, we produce a high Q-factor (~200) for a multi-crack sensor by integrating CSRRs with a higher-mode SIW. A SIW is a planar structure that offers additional functionalities over traditional waveguides, and attempts have been made to combine meta-material structures with a SIW to increase the Q-factor and sensitivity or reduce the sensor size [ 68 , 69 , 70 , 71 , 72 , 73 , 74 ]. However, combining CSRRs with a higher-mode SIW to separate and concentrate E-fields is proposed for the first time in the present study to enable multi-crack detection with a high Q-factor.…”

Chiroptical Metasurfaces: Principles, Classification, and Applications

“…Moreover, metasurfaces are much easier to fabricate due to their planar nature. To fully take advantage of metasurfaces, various applications have been studied, such as metaholograms [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ], metalenses [ 21 , 22 , 23 , 24 ], absorbers [ 25 , 26 , 27 ], structural colors [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], beam splitters [ 37 , 38 , 39 ], optical diodes [ 40 , 41 ], LiDAR applications [ 42 , 43 ], wide bandwith antennas [ 44 , 45 , 46 , 47 , 48 , 49 , 50 ], on-chip antennas [ 51 , 52 , 53 ], and MIMO and SAR antennas [ 54 , 55 , 56 ]. In particular, due to their ability to enhance chiral signals by field localization, chiral material sensing based on metasurfaces has sparked significant attention in recent years.…”

Substrate integrated waveguide leaky wave antenna with circular polarization and improvement of the scan angle

“…11 Substrate integrated waveguide consists of two wide conductive layers upper and lower of a substrate and vias in the sidewalls that shorted them together. 12 Slots are placed on the top layer of the substrate and radiation occurs through them. The benefits of this technology include low losses, easy construction, low prices, and small antenna dimensions that make them ideal for use in microwave technology and millimeter wavelengths.…”