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The paper proposes two kinds of filter structures based on LTCC technology, which includes single layer stepped-impedance microstrip line structure and multilayer structure. According to the design of requirements, two kinds of filter with different structure are designed finally. And the difference between these two kinds of structures is proposed from physical dimensions and performance respectively...
Electromagnetic (EM) wave tunneling through an epsilon-negative (ENG) waveguide has been realized when it paired with mu-negative (MNG) waveguide. The ENG waveguide is imitated by a hollow metallic waveguide which operating below cutoff frequency. The MNG waveguide is implemented by standard waveguide filled with square split resonate rings (SSRRs). The dimensions of the MNG waveguide differ from...
Compared with the optical remote sensing, microwave remote sensing has some advantages, such as penetrating clouds and all-weather observations. But one of the limitations of microwave radiometer is the relatively low intrinsic spatial resolution. In this paper, the Backus-Gilbert inversion (BGI) method and Wiener filter deconvolution technique are applied for enhanceeing resolution of simulation...
Tuning mechanism is considered to be a PIM source in coaxial resonator. A study of the influence on PIM by the placement of tuning mechanism has been made in this paper. The current on the resonance rod is used to calculate tunneling current, which is employed to predict the PIM level in a cavity. A method of approximation for nonlinearity is presented, using analytic formula to determine the coefficients...
In this paper, a new high-QL resonator using a combination of SIR (Stepped Impedance Resonator) shaped hairpin resonator, interdigital capacitor, and meander line with μ-near zero (MNZ) metamaterial is suggested. Interdigital capacitor is applied to a resonator to get high-QL performance and to obtain μ-near zero characteristic for size reduction. Also, the compact elliptic function and slow-wave...
The active space mapping algorithm was introduced to design a parallel coupled microstrip filter with HFSS and ADS in this paper. The simulation accuracy in Ka band or higher frequency is rough for ADS. We combined the fast optimization characteristics of ADS and excellent simulation accuracy of HFSS to achieve a design with timeliness and accuracy. Results showed that active space mapping algorithm...
A C-band rectifier with a wide input power range and a broad operation bandwidth is designed based on the voltage doubling circuit model. The circuit consists of a matching network, a capacitance, a packaged diode and a dc-pass filter. The simulated results show that the microwave-direct current (mw-dc) conversion efficiencies higher than 50% are obtained on 650 Ω load within the input power range...
A novel ultra-wideband (UWB) bandpass filter (BPF) with a notched band is presented, using a pair of triangle ring resonators with four open-stubs and defected ground structures (DGS). The double triangle ring resonators with four open-stubs which feed by a pair of interdigital coupled structure can obtain a UWB band with three modes. Then the medial circle ring DGS is added to create a notched band...
In this work, a compact surface mount (SMT) filter implemented with the substrate integrated coaxial line (SICL) is presented to offer a practical solution for the applications that require flexible filter design. The shielded filter features a low profile and low cross-talk characteristics, and can be assembled or removed from the system conveniently. The six-pole SICL band-pass filter centered at...
In this paper, end gap coupled flexible CPW resonators at 5.8 GHz on 32-μm polyimide film are presented in order to confirm influences such as resonant frequency and quality factor of the resonator with respect to extent of flexibility of film substrate. To define criterion of extent and perform EM simulation, for the first time, a new bent configuration is suggested. Also, before designing a resonator,...
This paper presents a high quality factor bandstop resonator working in two bands. It has a distributed structure fabricated in the type of microstrip. The part of resonator is made in the model of composite right/left handed (CRLH) transmission line (TL), which works in its stop band. It is different from the conventional CRLH-TL as a shunt stub which works in its pass band. This resonator has very...
A triple-mode substrate integrated waveguide (SIW) resonator is presented in this letter. Same square slots are etched on the double sided surface center of a SIW square cavity. With the aid of proper slot size selection, the resonant frequency of the dominant mode gets close with that of the second-order resonant mode. The triple-mode bandpass filter based on this resonator is then designed. The...
In this paper we discuss two types of band-pass filters at W-band, one is a parallel coupled microstrip band-pass filter and the other is an e-plane metal insert waveguide bandpass filter. The −20dB bandwidth of the parallel coupled microstrip filter is lager than 2.4GHz, while the −20dB bandwidth of the e-plane metal insert waveguide filter is lager than 1.8GHz. The simulation results are better...
A full-wave bridge rectifier with high conversion efficiency and high input range is proposed. A power dividing network is used to handle the low reverse breakdown voltage of Schottky diodes to achieve high input power. The defected ground structure is used to increase the coupling coefficient of the power-dividing network. The power-dividing network couple the input RF power into four differential-type...
A novel wideband microwave gain equalizer based on ceramic substrate is proposed in this paper with microstrip stepped impedance resonators (SIR). SIR lines are introduced to replace UIR lines used in the gain equalizer to increase the bandwidth and input/output return loss. To demonstrate its performance, a modified Microwave gain equalizer with SIR lines has been fabricated and measured. Results...
This paper proposed an easier but effective method to realize a tunable 2.4GHz lumped phase shifter employing varactor diode. This method is a revised type of lumped composite right/left handed transmission line(CLRH TL). A practical design using this method was then presented and averred by numeric simulation. The design showed that the tuning can be accomplished by changing one single voltage, which...
A differential power divider based on the Defected Ground Structure (DGS) operating at S-Band is developed. A novel DGS structure is proposed and its performance in the power divider is analyzed using a 3D full-wave simulator. The DGS structure can eminently realize miniaturization by comparing the operating frequency with the one without DGS and the one using conventional DGS. The return loss of...
Absorbing material has excellent attenuation ability to EM wave in high frequency. LC filter filled with absorbing material can realize high insert loss, above 80 dB, between 10 kHz and 110 GHz. This text first introduce the principle of absorbing wave of absorbing material, and then discussed eight compounded absorbing material's attenuation ability to high frequency EM energy. At last is the conclusion.
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