L-band SiGe HBT differential amplifiers with multiple bandpass or bandstop performance is presented. It incorporates stacked parallel-resonant circuits into the design of the output load of the differential amplifier to achieve multiple bandpass performance. On the other hand, the stacked parallel-resonant circuits are used between emitters of the differential transistor-pair to achieve multipl...

In this paper, a novel microstrip structure is developed to realize a dual-band bandpass filter. The proposed bandpass structure uses a microstrip resonator with two independently controlled resonance frequencies producing two frequency bands of interest controlled by adjusting the dimensions of the resonator. Parametric analysis is performed on the structure to determine the optimum dimensions...

In this paper we introduce a simple, computationally inxepentsive, adaptive recursive structure for enhancing bandpass signals highly corrupted by broad-band noise. This adaptive algorithm, enhancing input signals, enables us to estimate the center frequency and the bandwidth of the input signal. In addition, an important feature of the proposed structure is that the conventional bias existing ...

P cells, which carry both achromatic and chromatic information, are largely responsible for achromatic acuity and contrast sensitivity. The P cell achromatic information must be separated from the chromatic information to be useful. Cortical simple cells are well suited to the extraction of achromatic information by spatial bandpass filtering. Bandpass filtering of Type I P cells by cortical si...

In software radio systems, a digital IIR filter offers good roll-off and transition bandwidth characteristics using a low amount of arithmetic components, thus simplifying hardware implementation. However, IIR filter structures are very sensitive to finite precision compared to FIR filter structures. In order to design a high quality, low component count, digital narrowband bandpass filter onto...

The general Bandpass-B problem is NP-hard and can be approximated by a reduction into the weighted B-set packing problem, with a worst case performance ratio of O(B). When B = 2, a maximum weight matching gives a 2-approximation to the problem. In this paper, we call the Bandpass-2 problem simply the Bandpass problem. The Bandpass problem can be viewed as a variation of the maximum traveling sa...

A compact microstrip bandpass filter using miniaturized hairpin resonators is presented in this letter. Two modified stepped impedance hairpin resonators connected by parallel coupling are designed for the bandpass filter. The proposed miniaturized hairpin resonator is composed of a microstrip line and rectangular ring structures between parallel high impedance lines. A big capacitance in the h...

synthesize and design the new printed Bandpass Filtering Antenna. For the purpose of miniaturization and enhancing the overall performance of the circuit, a multifunction module is designed. It performs filtering and radiating, simultaneously with the help of codesign approach. A detailed synthesis and design procedure is given of two types of filtering antennas. Type 1 is 2.45 GHz third-order ...

We propose here a deep multilayer grating with adjustable bandpass as an alternative dispersing element to PET crystal in WDXRF spectroscopy. When making a multilayer grating, we remove part of the reflecting planes of a multilayer, allowing radiation to penetrate deeper. Since the resolution, or the bandpass, is reciprocally proportional to the penetration depth, we improve the resolution and ...

This paper reports the first derived thermo-optical properties for vacuum deposited infrared thin films embedded in multilayers. These properties were extracted from the temperature-dependence of manufactured narrow bandpass filters across the 4-17 µm mid-infrared wavelength region. Using a repository of spaceflight multi-cavity bandpass filters, the thermo-optical expansion coefficients of PbT...