Abstract—A novel miniaturized dual-band bandstop filter (DBBSF) is proposed by using the T-shaped defected microstrip structures (DMSs) and the U-shaped defected ground structures (DGSs) in this paper. The layout of the dual-band bandstop resonator (DBBSR) is presented at first. The dual stopbands of the DBBSR can be separately controlled since the mutual coupling of the defected structures is ...

analysis of aperture-coupled microstrip antennas with a superstrate using space domain closed form greens functions is presented. integral equations are derived from applying the boundary conditions on the radiating patch, across the aperture, and on the microstrip feedline. the computation of space domain greens functions is performed using the closed-form. the solution of the integral equatio...

Due to its small size, light weight, ease of integration, microstrip patch antenna is been widely applied to the fields of mobile radio, wireless communications, radar systems and so on. This paper presents a method of designing the millimeter-wave microstrip antenna which could be use in government and commercial applications, such as mobile radio and wireless communications that have similar ...

In this decade, compact bandpass filters are essential components in microwave systems for passing desired signals and suppressing unwanted signals. Microstrip bandpass filter is rapidly going up in the design and fabrication in RF front-ends of wireless communication systems. The microstrip structure is well-known because of its light weight and simple design method. As knowing, the bandpass f...

A miniaturized microstrip rat-race coupler with harmonics suppression is proposed by using shorted trans-directional (TRD) coupled lines. The shorted TRD coupled lines consist of a set of capacitor-loaded λ/4 coupled microstrip lines with two shorts, which are used to replace the 3λ/4 uniform transmission-line section (UTLS) in the traditional 3λ/2 ring coupler for miniaturization. To attain pe...

Microstrip antennas are that often applied because of their simple structure and easy to apply. The purpose the experiment was design analyze results microstrip in CST applications with a frequency 10.5 GHz. Experiments used single patch antennas, 1 x 2 arrays using patches 4 antenna patches. Each series has different characteristics return loss, gain, VSWR, axial ratio. Based on these experime...

Compact double notch coplanar and microstrip bandstop filters are described. They based on a version of the open interconnected split ring resonator (OISRR) integrated in or waveguides. The OISRR introduces an RLC connected parallel with propagating line. Therefore, this can be modeled as shunt circuit to ground, R, L C elements series. consequence for frequency response device is band at reson...

Harmonic radiation from microstrip patch oscillators is examined experimentally and theoretically using both a single and dual parallel-tuned circuit Van der Pol oscillator model. Closed-form expressions are obtained for the fundamental and first harmonic voltage amplitudes, and results show reasonably good agreement with a commercial circuit simulator. Such expressions will be useful for desig...

There are unusual nonlinear behaviors in superconducting materials, especially at low temperatures. This paper describes the procedure to reliably predict this nonlinearity in superconducting microstrip transmission lines (SMTLs). An accurate nonlinear distributed circuit model, based on simultaneously considering of both quadratic and modulus nonlinearity dependences, is proposed. All paramete...

A Quad-band bandpass filter for wireless RF devices is presented. The circuit is capable of serving multiple FDD and TDD bands of the 4G LTE standard. A microstrip transmission line is used to feed stepped impedance resonators for providing four bands in LTE spectrum. The proposed filter is simulated using IE3D simulator. The centre frequency and bandwidth of each passband can be controlled by ...