In this article an innovative method of studying and removing the resonances, inherently exhibit by some waveguide to microstrip transitions, is presented. By modeling equivalent circuit, new approach allows obtain constructive parameters a finline transition, only using values resistance capacitance components circuit. This procedure will allow small microwave design Companies realize these tr...

In this paper, a compact antenna design method is proposed for microstrip patch antennas using double-layered defected ground structure (DGS) configuration. While conventional single-layered yields lower resonant frequency and Q-factor, smaller circuit size can be achieved an additional substrate with higher dielectric constant. The reduction obtained from the LC elements analytically explained...

With the tremendous advancements in wireless communications, there is an increasing demand for miniature, low-cost, easy-to-fabricate, multiband and wideband antennas for use in commercial communications systems. As a part of an effort to further enhance modern communications systems technology, researchers have been studying different approaches for creating novel and innovative antennas. The ...

In order to improve mixed optical-electrical microwave devices design, a novel modeling of opto-electronic phenomena as photoconduction effect has been achieved. Multiples photo-induced carriers generations/recombinations processes playing a part in semiconductor subtrates under laser illumination are taken into account and modeled by an equivalent electrical circuit. Various types of modulatio...

in this article, the linear array (with 20 elements in the horizontal orientation) of microstrip antenna is examined with horizontal polarization. the set includes three microstrip substrates. there is a power network in two lower substrates and microstrip patches in the upper substrate. excitation of patches has been done as coupled through the power network in two lower substrates. using the ...

In this paper, the impact of bias networks on a radio frequency (RF) power amplifier (PA) is analyzed and discussed comprehensively. Both different sizes positions microstrip line circuit have been studied for broadband class AB PA. simulations measurements show that performance PA can be greatly improved with adjustment by effecting harmonic impedance whole matching circuit. Compared existing ...

Abstract—This paper presents a novel compact microstrip hybrid four-mode bandpass filter (BPF) with good selectivity and multitransmission zeros. By adding an external resonator to a triplemode stub-loaded resonator, four modes are generated in the desired passband and a hybrid four-mode BPF is implemented. Oddand even-mode theory is introduced to investigate the mode characteristics of triple-...

An analysis of microstrip line fed antennas has been presented theoretically using circuit theory concept. The theoretical investigations of F-shape antenna parameters such as return loss, VSWR, gain and efficiency have been calculated. It is found that antenna resonate at 2.4 and 5.2 GHz for lower and upper resonance frequencies respectively. The bandwidth of the F-shape antenna at lower reson...

YONG-CHAE JEONG Chonbuk National University Chonju, Korea SI-GYUN JEONG Samsung Electronics Gyeonggi-Do, Korea JONG-SIK LIM Korean Intellectual Property Office (KIPO) Daejeon, Korea CHUL-DONG KIM Sewon Teletech Inc. Kyeonggi-Do, Korea Recently, extensive research efforts on photonic band gap (PBG) structures where periodic patterns are etched on the ground plane of microstrip lines have been co...

This paper presents a symmetric-type microstrip triple-band bandstop filter incorporating a tri-section meandered-line stepped impedance resonator (SIR). The length of each section of the meandered line is 0.16, 0.15, and 0.83 times the guided wavelength (λ g ), so that the filter features three stop bands at 2.59 GHz, 6.88 GHz, and 10.67 GHz, respectively. Two symmetric SIRs are employed with ...