In this paper, a novel planar waveguide filter based on liquid crystal materials is devised, and half-mode corrugated substrate integrated (HMCSIW) tunable bandpass with complementary split ring resonator (CSRR) structure proposed. The HMCSIW uses an array of quarter-wave open-circuit stubs to replace conventional (SIW). While retaining the original cut-off frequency (CSIW), we reduce circuit size by splitting central axis achieve miniaturization. By utilizing band-stop features CSRR in...

A novel, compact microwave tunable bandpass filter integrated power divider, based on the high anisotropy electro-optic nematic liquid crystal, is proposed in this letter. Liquid as material, placed between top inverted microstrip line and metal plate. The structure can realize continuous response miniaturization. design concept validated by good performance of simulation results experimental results. material has shown great potential for application.

A waveguide 10 dB directional coupler operating from 325 GHz to 400 is designed based on the short-slot Riblet-type coupling configuration and fabricated using deep reactive ion etching (DRIE) silicon micromachining technique. The skin depth conductivity of gold film with roughness 0.2 μ m are investigated at 300~1000 frequency band for higher accuracy. In order measure small-size four-port two-port VNA big-size flanges, three testing topologies designed, in which terahertz (THz) wedged-type...

This paper proposes a novel microwave continuous adjustable band-pass filter integrated power divider based on nematic liquid crystals (LCs). The proposed uses crystal (LC) as the dielectric material. It can realize phase shift by changing anisotropy, when biasing high anisotropy crystal. is mainly used in frequencies. has large number of advantages compared to conventional divider, such low loss, multifunction integration, adjustable, miniaturization, processing costs, operating voltage,...

A microwave tunable substrate integrated waveguide bandpass filter using nematic liquid crystals is researched in this paper combined with the complementary split-ring resonators. The crystal used to control corresponding working frequency, its permittivity changing caused by deflection angle of molecules. And controlled bias voltage. simulation results show that changes from 2.79 3.56 make passband frequency achieve 490 MHz offset.

A pattern reconfigurable leaky-wave antenna loaded liquid crystal material (LC) is presented based on novel half mode substrate integrated waveguide (HMSIW) circuit in this paper. By loading interdigital capacitor gap (IDC), the leaky wave radiation realized. LC-based can achieve bias tuning by rectangular DC ground which inside waveguide. With tuning, main beam of deflected 16.In addition, process, gain fluctuation less than 1.2dB and maximum peak 10.14dBi. The proposed working at...

Abstract In this paper, a novel microwave continuously tunable band-pass filter, based on nematic liquid crystals (LCs), is proposed. It uses crystal (LC) as the electro-optic material to mainly realize frequency shift at band by changing dielectric anisotropy, when applying bias voltage. According simulation results, it achieves 840 MHz offset. Comparing existing has many advantages, such tunable, miniaturization, low processing costs, tuning voltage, etc. Thus, shown great potentials in...

We investigate the absorption properties of cyclotrimethylene trinitramine (RDX) single crystals from ∼15 to 150cm −1 using terahertz time-domain spectroscopy. observe that all modes exhibit strong anisotropic behavior in terms crystal orientations. demonstrate anharmonic phonon model can well describe temperature-dependent behaviors these modes. These results indicate intermolecular interaction plays a major role collective motion large number RDX molecules. Our findings provide important...

In power conversion applications using GaN HEMT with high switching frequency, loss dominates in total and could be very sensitive to parasitic parameters as a result of fast-switching operation. Since conventional calculation formula suffers from inconsistent error designs HEMTs various conditions, it is desirable have effective ways for more accurate estimation on HEMT. this paper, two different kinds model are developed forms both empirical analytical model, taking into account the effect...

This paper presents a reflection predistorter based on Schottky diodes. It can improve the strong correlation between gain and phase of traditional analog used in solid-state power amplifier (SSPA). The operates at 25-27 GHz is implemented using GaAs monolithic microwave integrated circuit (MMIC) process. experimental results show that has opposite distortion performance SSPA, function be tuned independently verified. By adjusting bias voltage linear branch, compression change by 31.2°,...

This paper presents an analog predistortion (APD) linearizer suitable for V-band traveling wave tube power amplifier. A new "field-circuit combination" design method based on the Schottky barrier diode (SBD) three-dimensional electromagnetic simulation model (3D EM Model) is used. reflection type APD consisting of a 90° waveguide 3dB hybrid and two SBDs developed tested. The actual measurement results show that within input range - 25~10dBm, gain expansion more than 7.8dB phase over 28° in...

In this paper, a leaky-wave antenna based on half mode corrugated substrate integrated waveguide (HMCSIW) and liquid crystal is proposed, which realizes the frequency pattern refactoring. The designed with 4-unit periodic gap to radiate electromagnetic energy outside. With electric tuning material, deflection of reconfigurable can be continuously adjustable. working bandwidth about 5GHz, main lobe scanning angle reach 22°, actual gain small loafing 9.8dB over permittivity from 2.4 3.4. It...

In this work, for the research of novel waveguide filters, we propose a microwave corrugated substrate integrated CSIW filter based on high anisotropy electro-optic nematic liquid crystal. Metallic vias (SIW) is replaced by quarter microstrip stubs CSIW, which solves problem shorting upper and lower planes due to metalized when SIW biased. Using electromagnetic scattering characteristics complementary open-loop resonance type anisotropic medium structure, enhanced can amplify cutoff mode....

In this paper, a frequency reconfigurable conformal array antenna based on liquid crystal material is proposed. Firstly, the electric tuning principle of and miniaturization technology microstrip antenna, miniaturized unit with coupling feeding mode designed. The size units only 0.14λ*0.14λ by reducing radiating patch through fractal slot structure used to increase bandwidth reduce influence line radiation patch. Finally, four elements are formed into array, can be reconstructed adjusting...

In this paper, a novel wideband band-pass center frequency tunable filter is proposed based on liquid crystals for applications at millimeter-waves, which uses micro-strip periodical structure with loading square spiral resonators. The range of the about 1.59 GHz while external bias voltage crystal turns from 0V to 30V. ranges 39.08 40.67 GHz. And insertion loss 3.9dB. has many advantages, such as continuously electrically tunability, miniaturization, low tuning voltage, etc. Therefore,...

This paper introduces a 1:2 ultra-wideband (UWB: 41-48 GHz) Wilkinson power divider. divider, with microstrip, is realized on low-temperature co-fire ceramic(LTCC) substrate which has the dielectric constant of 5.7. |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | better than 15 dB were simulated by HFSS. xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> and xmlns:xlink="http://www.w3.org/1999/xlink">31</sub> less 3.6 also...

A microwave frequency continuously electrically tunable split ring resonator (SRR) band-pass filter using nematic liquid crystal (LC) is proposed in this paper. The used to obtain the shift of band by changing its permittivity at room temperature (20°C-2S <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∘</sup> C). controlled bias voltage. simulation results show that 890 MHz offset achieved. has many advantages, such as tunability,...