─ A novel quarter-circle defected ground structure shape is introduced in this paper to design and implement an ultra-wide reject band low-pass filter (LPF). Moreover, an equivalent circuit model (ECM) is presented. The proposed LPF has small size and, a low insertion loss and a return loss less than -20 dB. Also, a round -20 dB suppression level ranging from 4 GHz to more than 20 GHz is achiev...

— In this paper, the ultra-wideband (UWB) bandpass filter (BPF) with a wide stopband is presented. The prototype of proposed UWB BPF is by bending the five short-circuited stubs and coupling the I/O feed lines. In order to have a wide stopband, an bandstop structure embedded in input/output (I/O) lines without degrading the passband performances is used. The measured results verified that by us...

This paper introduces a bandpass (BP) NGD circuit design engineering. The developed circuit is designed and implemented using distributed microstrip technology operates with outstanding dual-band bandpass NGD performance added low attenuation. BP NGD topology presents an innovative geometrical shape represented by OOO (triple O) structure composed of multi-parameter parallel transmission l...

We have developed a novel technique for making high quality measurements of the millimeter-wave properties of superconducting thin-film microstrip transmission lines. Our experimental technique currently covers the 75−130 GHz frequency range. The method is based on standing wave resonances in an open ended transmission line. We obtain information on the characteristic impedance, phase velocity,...

Antenna Miniaturization Using Fractals Richa Garg, AP ECE Deptt., [email protected], J.C.D.C.O.E., Sirsa ABSTRACTThe use of fractal geometry in designing antenna has been a resent topic of interest. Fractal shape has their own unique characteristics that the improved antenna performance can be achieved without degrading the antenna properties. Modern telecommunication system requires antenn...

This paper presents a new architecture for an AlGaN/GaN HEMT frequency doubler using the active integrated antenna design approach. A microstrip patch antenna designed at the second harmonic is integrated with the HEMT. The antenna operates as a fundamental frequency reflector in this circuit. Using AlGaN/GaN with 1mm gate periphery, a 4 8 GHz frequency doubler was designed by the suggested des...

A coupled-line circuit structure is proposed in this paper to design a modified Schiffman phase shifter with short reference line. Based on the traditional transmission line theory and ABCD parameters, closed-form mathematical equations for electrical and scattering parameters are obtained. Obviously, this proposed coupled-line phase shifter has several advantages such as arbitrary phase differ...

A design of back-to-back tapered line transition is presented. The transition is suitable for application in feeding arrays of double-side printed antennas. Tapered transmission lines are transmission line whose characteristic impedance is tapered from one value to another. Back-to-back circuits of identical transitions are designed, measured, and their characteristics are compared with theoret...