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Microstrip antennas have been widely used during the past four decades due to mechanical and economical advantages. The rigorous analysis of the microstrip antenna involves the solution of an electric field integral equation (EFIE) whose kernel must account for the effect of the dielectric slab. In this paper a simple approach for determining input impedance and resonant frequencies of microstrip...
Steering of main beam of radiation at fixed millimeter wave frequency in a Substrate Integrated Waveguide (SIW) Leaky Wave Antenna (LWA) has not been investigated so far in literature. In this paper a Half-Mode Substrate Integrated Waveguide (HMSIW) LWA is proposed which has the capability to steer its main beam at fixed millimeter wave frequency of 24GHz. Beam steering is made feasible by changing...
An electronically controlled half-width microstrip leaky-wave antenna (HW-MLWA) that can scan the main beam at a fixed frequency is presented. A technique is described to change the upper and lower limits of the beam direction without changing the scanning range itself. By varying the reactance profile at the free edge, the main beam of the proposed antenna can scan a range of 23° in discrete steps...
A design of microstrip patch antenna over perforated substrate is presented to proof the concept of performance enhancement using micromachining techniques. The presented perforated antennas are designed using standard equations as well as the derived equations for synthesized permittivity calculation. Then a proposed structure based on this technique is implemented and measured. A very good agreement...
Rectangular microstrip structures (RMS) are widely used in various microwave devices. Using the method of moments and principle of partial images, various techniques are created to determine charge distribution in 2D models of microstrip structures (their cross-section). In this paper, a technique for calculating surface charge distribution and total capacitance of complex 3D rectangular microstrip...
Three via-free microstrip composite right/left handed (CRLH) unit cells are presented, which enable easy and low-cost fabrication of transmission lines exhibiting the infinite wave length phenomenon. All guiding structures are designed in an entirely printed circuit technology based on the transmission line theory and its equivalent circuit. Supported by EM simulation software the unit cells are optimized...
This paper describes the effect of anisotropy on the pulse propagation in microstrip like structures for 0 Lt w/h les 10 anisotropic ratio 0.5 les n les 3 for both low and high permittivity substrates. The anisotropic substrate is transformed into an electrically equivalent isotropic substrate such that the line capacitance in both cases is identical. Using this dispersion model of anisotropy for...
We present a model on the based of K.C. Gupta proposal for inductance and capacitance for epsivr = 9.6 epsivr = 4.0 respectively for single layer and compare the numerical calibration with de-embedding techniques used in the planar electromagnetic (EM) simulation (SONNET) for epsivr = 2.3, 4.0, 15.1, 20.0 & 40.0. We change the model for multilayer and compare with present model for epsivr = 12...
This paper proposes a vertical transition between microstrip line and substrate integrated waveguide (SIW) on multilayer low-temperature co-fired ceramic (LTCC) as well as its equivalent circuit model. The transition structure is realized by a shorted via between microstrip line and the bottom of SIW. The equivalent model is derived by calculating the input impedance in waveguide and the simulation...
A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
In this paper, the design of a compact planar bandpass filter above a defected ground plane is presented. The filter is designed as a combination of microstrip resonators and exploits the properties of a planar electromagnetic bandgap (EBG) structure patterned unto the ground plane of the printed circuit board material to provide a very wide stopband of up to 5 times the fundamental frequency. The...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
It is shown that the efficiency of an arbitrary previously designed interconnect can be increased using a suitable compensating circuit at its far end. A lossless lowpass circuit is considered for this purpose and its element values can be obtained by an optimization method. The proposed idea is evaluated using an example.
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