Coupled resonators are widely used in the design of filters with dual-passband responses. In this paper, we present a dual-band bandpass filter using only couplings between adjacent resonators without cross-couplings. The dual-band bandpass filter with centre frequencies of 1747MHz and 1879MHz respectively is designed and fabricated using microstrip U-shaped resonators. Using the coupled resona...

Two coupled channel effects connected with kaon pair production in proton-proton collisions are discussed. (1) Although there is ample evidence that the antikaon is strongly attracted to the recoil protons in pp → Kp {K−p}, residual effects of the KK interaction are seen, including a possible cusp at the KK̄ threshold. This is investigated within a simple K-matrix approach. (2) The production ra...

We prove existence results for a system of partial differential equations describing the approximate condensate wavefunction and pair-excitation kernel dilute T = 0 Bose gas in stationary setting, presence trapping potential repulsive pairwise atomic interactions. Notably, Hartree-type equation this contains contributions from non-condensate particles, pair excitation satisfies nonlinear operat...

Recently it has been shown that the transition of the 1+1-dimensional annihilation-fission process 2X→3X, 2X→Ø exhibits an unusual type of nonequilibrium critical behavior. The phenomenological properties of critical clusters are characterized by two different dynamic modes for spreading and diffusion. In order to describe the interplay of these modes, we introduce an effective model which invo...

A recently proposed scheme for calculating E-shell ionization cross sections in atoms and molecules using the relaxed-core Hartree-Pock (RCHF) approximation is extended to the treatment of shakeup processes. As an example, this scheme is applied to the m-~* satellites in the C ls photoelectron spectrum of CO. These results for the (SO, S1) pair of ~-~* satellite states reveal strong interferenc...

In the linearized theory of gravity coupled to the electromagnetic field, we calculate the cross sections of two processes in which both the gravitational and electromagnetic interactions play a role. Those processes, in which a graviton is produced in the final state, are: (a) the photoproduction of graviton off electrons, and (b) the production of a photon and a graviton from e-e pair annihil...

This thesis presents a backgate coupled QVCO with current reused structure, and complementary cross-coupled differential Colpitts VCO and QVCO. The formally proposed QVCO not only dissipates significantly lower power but also improves 1/ƒ close-in phase noise, compared to the conventional QVCO. For verification of the suggested idea, the proposed QVCO designed for 2 GHz operation based on a 0.1...