In this paper, resin-based photocurable polymer materials for stereolithography, digital-light-processing (DLP), and polymer-jetting additive manufacturing techniques were characterized from 0.2 to 1.4 terahertz (THz) their comprehensive dielectric properties, e.g., refractive index, absorption coefficient, constant, loss tangent, by using laser-based THz time-domain spectroscopy. A total of 14 3D-printing polymers chosen, owing suitability, in terms printing resolution, material...

This paper presents a 220-320-GHz hemispherical lens antenna fabricated using photopolymer-based additive manufacture and directly fed by the standard WR-3 rectangular waveguide without any additional extension. The microfabrication process is based on digital light processing rapid prototyping Monocure 3DR3582C resin-based photocurable polymer. gives various key advantages, including ease of fabrication, manufacturing speed, cost-effectiveness due to its fabrication capability. Even though...

This work presents, for the first time, an in-situ self-aligned fluidic-integrated microwave sensor characterizing NaCl contents in NaCl-aqueous solution based on a 16-GHz bandpass combline cavity resonator. The discrimination of concentration is achievable by determining amplitude differences and resonant frequency translations between incident reflected signals at input terminal resonator capacitive loading effects comb structure inside introduced under test. Twelve liquid mixture samples...

Abstract This paper presents a comprehensive study of the optical and electrical dielectric material properties six commonly-used silicon glass substrates at terahertz (THz) frequencies, including refractive index, absorption coefficient, constant loss factor. The characterization techniques used in this feature THz time-domain transmission reflection spectroscopy with measurement frequencies from 0.5 up to maximum 6.5 THz. Of selected semiconductor substrates, two are wafers resistivities...

This article presents, for the first time, new design and fabrication techniques Hollow Substrate Integrated Waveguides (HSIWs), demonstrated in nominal frequency from 21 to 31 GHz, use wireless communication applications such as 5G, IoT robotics. The introduced this paper feature: 1) of low-cost rapid prototyping additive manufacturing based on polymer jetting (PJ), 2) commercially available through-substrate copper via transitions. In contrast conventional SIW designs fabrications,...

This paper presents a 3D-printed hemispherical lens integrated with planar ultra-wideband (UWB) antenna. The flower-shaped stub slot UWB antenna is made of 0.8-mm FR-4. operating frequency the covers 3.10 GHz - 11.6 nominal gain at zero degrees 1.74 dBi. To enhance antenna's high-gain radiation, additive designed and fabricated from acrylonitrile butadiene styrene (ABS). electrical properties, i.e., relative permittivity loss tangent, ABS are 2.66, 0.003, respectively. Four different radii...

This paper presents a portable 3D-printed lens antenna fed by standard rectangular waveguide at X-band for object classification. The proposed can integrate with the without any additional assistant tools. A high impact polystyrene is used to design hemispherical using fused deposition modelling technique. additive manufacturing gives several advantages including rapid prototyping, better cost and time effectiveness. Five radiuses, e.g., 20 mm, 30 40 50 60 are investigated increase gain of...

In this article, a harmonized fabrication and assembly process combining additive subtractive manufacturing (SM) is introduced for the rapid manufacture of millimeter-wave components, especially those using hollow substrate integrated waveguide (HSIW). HSIW has been shown to have some significant advantages communications, radar, sensing systems, but its can be challenging. To pattern metallic layers that form top bottom walls, as well other structures such microstrip lines landing pads...

In this paper, a microwave gas sensor using interdigital resonator with coating of poly (3,4-ethylenedioxythiophene) polystyrene sulfonate or PDOT:PSS is presented. The proposed uses the change conductivity properties when ammonia adsorbed on layer. was designed at center ungrounded coplanar waveguide transmission-line by creating rejection characteristic 4.08 GHz. fabricated DiClad 880 substrate dielectric constant 2.2 and loss factor 0.008. To improve sensitivity sensor, coated top...

This paper presents on a miniaturized planar sensor for characterizing relative permittivity of materials. The proposed design is based near-field transmission-line measurement technique implemented by modified complementary square ring resonator (CSRR). simple microstrip which theoretically matched to 50 fl input impedance. On the ground plane, CSRR created generate resonant frequency with behavior band reject characteristic. 1st and 2nd iterations Minkowski fractal pattern are applied...

This paper presents the liquid-mixture sensor using a zeroth-order resonator (ZOR) based on mushroom-like structure. The structure is designed Jerusalem shape for reducing size of and providing high Q-factor that operating frequency at 5.90 GHz. By perturbation theory, each dielectric properties affect to resonance frequency. In this paper, four conditions, only sensor, with empty Teflon tube, inserting deionized water Sodium Chloride solution (NaCl), are investigated performance reflection...

This paper presents a monopole decagon fractal patch resonator with the defected ground plane for WLAN MIMO antenna. The technique on edge of is used reducing operating frequency Concurrently, (DGP) rectangular shape can reduce mutual coupling between radiating patches due to suppression current. reflection coefficient and isolation proposed antenna are achieving higher than -10 dB -15 dB, respectively, which covering entire band 2.40-2.485 GHz. Then, radiation results clearly perform...

This paper presents a 3D-printed hemispherical lens integrated with flower-shaped stub antenna for liquid-mixture characterization. The proposed is designed, fabricated, and the ultra-wideband planar antenna. A high impact polystyrene (HIPs) selected to design by using fused deposition modelling (FDM) technique, due low loss material. optimum dimensions of are obtained 3D EM Simulation CST Studio, which used investigate performance antenna, e.g., gain, radiation pattern reflection...

This paper presents a microwave gas sensor based on interdigital resonator structure coating with sensing material of poly (styrene-co-maleic acid) partial isobutyl/methyl mixed ester (PSE). was designed the center coplanar waveguide (CPW) to operate at 4 GHz rejection characteristic. The measured results for five samples ammonia hydroxide concentration (50, 200, 500, 1000, and 2000 ppm) under static system in closed chamber room temperature were obtained. levels can be impressively detected...

This paper presents a 3D-printed THz hemispherical lens antenna integrated with the open-ended rectangular waveguide at WR-10 band for characteristics enhancement, e.g., gain and half-power beamwidth (HPBW). The digital light processing (DLP) technique, which is one of famous 3D printing techniques, chosen fabricating antenna. proposed design can be integrating without any extra assistant tools during assembly an waveguide. In simulation, radiuses are investigated by varying from 2 mm to 5...

This paper presents a monopole MIMO antenna using decagon fractal patch resonator and defected ground plane for wireless local area network (WLAN) application. The technique is applied on the edge of lower band operating frequency. Meanwhile, disturbed with rectangular shape to decrease mutual coupling between radiating antenna. From results, proposed compact size 50 × 60 1.6 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> obtained....

This research presents a design and analysis of an open-loop microstrip resonator which is integrated with microwave sensor system. It used for measuring binary-liquid mixed concentration sodium chloride (NaCl) DI-water to detect salinity level. The designed provide band-stop bandwidth 1 GHz, has operated from 2 GHz 3 GHz. proposed system consists synthesizer, voltage detector, that operate at characterize the level sample liquid mixture. A mixture samples NaCl Distill-water 5 different...

A low cost and profile <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2\times 2$</tex> Vivaldi array antenna is designed developed to observe detect the 1.42 GHz hydrogen line emission from space. Firstly, single element of at operating frequency which obtains directional pattern with average gain around 4 dBi. To achieve high decrease HPBW, introduced each receives signal through 1 Wilkinson power divider. The proposed 60 deg-HPBW side lobe...

This paper presents a terahertz free-space (THz) measurement technique using photopolymer-based additive manufactured hemispherical lens antenna directly fed by WR-3 rectangular waveguide with an operating frequency range of 220 GHz to 320 GHz. The is fabricated in-house custom-made low-cost photopolymer 3D printing digital light processing (DLP) fabricate layer-by-layer Monocure 3DR3582C material. An asymptotically single-mode all-dielectric Bragg fiber used investigate the performance...

A low-profile triple band antenna is designed, investigated and developed to use as the indoor mounted ceiling for 4G-LTE 5G-NR distributed system. The proposed implemented on 0.8-mm thickness PCB substrate obtains compact size of 120 ×135 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , which composes oval patch trimmed by three slots microstrip feed line chamfered ground plane with tuning slot. prototype measured impedance...

Abstract National Astronomical Research Institute of Thailand (Public Organization) initiated a national flagship project in 2017 for development radio astronomy and geodesy Thailand. In this project, 40-m Thai Radio Telescope (TNRT) 13-m VLBI Global Observing System (VGOS) telescope as its co-location are constructed Chiang Mai. The TNRT is the largest South-East Asia. Its flexible operation with wide-coverage observable frequencies 0.3-115 GHz will allow us to uniquely contribute...

This paper presents, a novel design of Hollow Substrate Integrated Waveguide (HSIW), that is built by using both Subtractive and Additive Manufacturing technologies. Specifically, it utilizes Polymer jetting method to print an Acrylonitrile butadiene styrene (ABS) dielectric substrate water laser cutter system produce smooth copper sheets as the top bottom enclosures HSIW. Also, fabrication process utilizing mechanical through hole plating commercially available prefabricated vias,...