This study develops an all-optical high-sensitivity pressure sensor based on fiber Bragg grating (FBG) encapsulated in a polymer-half-filled metal cylinder. The polymer can be pressurized along one radial direction only, and responds to axial force the round plate, creating stretched-strain FBG. measured sensitivity is 2.2/spl times/10/sup -2/ MPa/sup -1/, which 10 900 times higher than for bare Owing its good linearity, this applied measure medium pressure, liquid level, depth underwater.

A novel 5th-order cross-coupled tunable bandpass filter based on full-wavelength resonator with four independent coupling regions, including two electric and magnetic regions is proposed. The slop of the coefficients versus resonant frequency can be pre-defined to meet requirement constant bandwidth. bandwidth cascaded trisection (CT) structures, one all type CT cell cell, cells share a common reduce size. Therefore, transmission zeros are generated besides passband for improving...

In this paper, a novel analogue tunable bandpass filter with constant absolute bandwidth is presented. The designed based on full wavelength microstrip open ring resonators loaded varactors. Magnetic dominated mixed coupling to make the coefficient meet requirement of response. designed, fabricated and measured. measurement shows that -3 dB from 105MHz 109MHz while central frequency passband varying 2.39 GHz 2.82 GHz. return loss better than 15 dB.

A discrepancy of monolithic microwave-integrated circuit (MMIC) amplifier simulations is discussed for conventional electromagnetic (EM) co-simulation in advanced design system (ADS). An obvious occurs when microstrip (MS) type transistor schematic models are used a high gain MMIC amplifier. The coupling effect backside via hole the MS-type model, which excluded from EM layout simulation, demonstrated to be root this error that will become significant high-gain design. new method proposed...

Abstract In this paper, a novel iterative method is proposed to find the matching impedances for all‐port simultaneously conjugate of N‐port networks. This takes advantages reciprocal and lossless features network, which leads unitary symmetric properties its S matrix. As result, computing complexity analyzed proved be very efficiently reduced compared previously reported methods. A two‐port two three‐port networks, ten‐port four‐port 2 × antenna array are presented demonstrate efficiency method.

In this article, a novel coupling structure is proposed. The surface voltage and current distribution on can be tuned by changing the ratio of two capacitances so that central frequency coefficient tuned. also to change sign coefficient, which utilized control transmission zero cross coupled tunable bandpass filter. A second order filter with bandwidth designed measured. measurement shows tuning range 0.768 1.512 GHz fractional 0.052 0.18 at 1.14 GHz. It constant or absolute bandwidth....

A size-minimized low-insertion-loss reflectionless bandpass filter with four notches is presented in this paper. The insertion loss of two quasi-elliptic-type filters studied and optimized by a new approach based on cascade resonators branches. Parameters extraction procedure for the desired position illustrated. inband performance, bandwidth notch width are studied. This novel brings lower loss. It can be extended to arbitrary number notches. size also minimized. designed, simulated,...

This paper presents a third-order digital tunable bandpass filter based on digitally capacitor loaded open ring resonator. Magnetic dominated mixed coupling is utilized to make the coefficient meet requirement of stable bandwidth response. Electric source-load designed generate transmission zero for improving frequency selectivity. designed, fabricated and measured. The measurement shows that can be tuned by 5-bits, fractional 9 ± 1%, tuning range from 410MHz 820 MHz.

In this paper, a monolithic integrated power amplifier based on 0.25um GaAs pHEMT process working in 3.36GHz-3.65GHz is designed, fabricated and measured. Integrated microstrip line used as the passive load of stage; input output LC matching network are designed. The measurement results show that gain 16dB. at 1dB compression point (P1dB) 23dBm along with efficiency 22% central frequency.

Abstract A novel resonant‐type group delay controller based on third‐order resonant topology with tunable central frequency and coupling coefficients is proposed. The structure realized by coupled line resonators loaded two shunt capacitors for coefficient tuning, a series capacitor then the working can be tuned. has advantage of large range breaks through traditional circuits. circuit designed, simulated, measured. measurement shows that tuned from 5 to 20 ns in 0.8–1.05 GHz, minimum ± 0.5...

In this paper, a novel mixed coupling tunable LC bandpass filter (BPF) with constant bandwidth is proposed. The introduction of the magnetic-dominant topology can not only generate transmission zeros for strong out-of-band rejection, but also compensate to achieve while tuning. Measurement results show that central frequency tuning range designed from 85 MHz 300 -3dB in 22 39 MHz.

This paper presents a third-order digital tunable bandpass filter based on digitally capacitor loaded microstrip open ring resonator.Magnetic dominated mixed coupling is utilized to make the coefficient meet requirement of stable bandwidth response.Electric source-load designed generate transmission zero for improving frequency selectivity.This designed, fabricated and measured.The measurement shows that can be tuned by 5-bits pure command.The fractional 9 ± 1%, tuning range from 410 MHz 820...

A novel minimized microstrip planar antenna with pre-controllable resonant frequency and impedance matching is presented for microwave engineering applications. Double-sided structure adopted to build the loop of antenna. The tuning studied, can be adjusted independently. These characteristics are validated by full wave electromagnetic simulation. 2.4 GHz ZigBee application designed based on proposed structure. simulation shows that −10 dB bandwidth from 2.21 2.74 an omnibearing radiation,...

In the study, Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ceramic substrates are chosen as to fabricate modifiable dual-mode filters, which designed for fundamental mode of frequency 2.4 and 5.2 GHz in order operate on channels IEEE-802.11a/b/g.

An integrated 3rd-order pseudocombline bandpass filter with pre-designed second to fundamental harmonic ratio is designed based on 0.25 μm GaAs (Gallium Arsenide) process. λ0/4 microstrip loaded capacitor used as the resonator. The frequency of resonator investigated, and can be controlled by resonator's capacitor. coupling coefficients external quality factor are matrix. This was fabricated die size 1050 μm×1556 μm. measurement shows that 10.7, stopband rejection keeps higher than 40 dB...

In this paper, a microstrip LC two-section Wilkinson power divider based on GaAs IPD process is proposed. A method adjusting circuit parameters demonstrated, which can compensate the parasitic effects of frequency-dependent passive components. One sections lumped network and other section consists lines. This design reduce size avoid high loss. The inductance capacitance are calculated to ensure that equivalent line. However, capacitances inductances all sensitive frequency so there...

Magnetic-free broadband circulator structure based on three switched reflection type delay lines with a total electrical length of 180-degree at the switching frequency is investigated. The nonreciprocal transmission property modeled and simulated, impedance mismatching reconfigurable direction are studied. A prototype magnetic-free circuit designed fabricated using coaxial cables switches driving by 7.94 MHz tolerance ±10%. scatter parameters measured in 300kHz ∼ 100 MHz. It shows that can...