A new class of wideband ring-type microstrip bandpass filter is proposed under smaller size of three quarters waveguide length section. One via hole is placed at perpendicular positions of a squared ring, whereas two short-circuited sections are formed in the ring-type microstrip bandpass filter similar to a dual-mode ring filter in shape, thereby making up a three quarters waveguide length rin...

Based on the C-shaped microstrip slot antenna, a new photonic band gap substrate for multifrequency microstrip slot antenna is designed. The antenna has a groove been dug below the radiation plate, within which the radiation plate is placed, and air triangular prism column gaps with different height are placed in the substrate periodically. Numerical simulation is performed for the antenna with...

The compact microstrip antenna is realized by placing shorting post or plate along the zero field line at the fundamental mode of the patch. In this paper, compact variation of circular microstrip antenna, a shorted 90 sectoral microstrip antenna is discussed. It gives a bandwidth of more than 300 MHz at center frequency of around 1000 MHz. Further a new 90 sectoral microstrip antenna, realized...

─ A simple and novel low-loss diplexer with two folded Open-Loop Ring Resonators (OLRRs) that couple three microstrip lines is proposed. The first passband and second passband of the designed diplexer could be easily and accurately shifted to a desired frequency and construct the bandpass filters by adjusting the physical dimensions of the OLRRs. These results suggested that the proposed diplex...

In this paper, we carry out a full-wave analysis of shielded two-port microstrip circuits, in which the metallizations are embedded in a multilayered substrate that may contain isotropic dielectrics and/or anisotropic dielectrics. The Galerkin’s method in the spectral domain is applied for determining the current density on the metallizations of the circuits when their feeding lines are excited...

A single feed compact microstrip antenna is proposed in this paper. L slit is introduced on the right edge of the patch to study the effect of the slit on radiation behavior with respect to a conventional microstrip patch. The resonant frequencies are obtained at 1.85, 2.4, 3.44 &4.31 GHz with corresponding bandwidth 10 MHz, 15.13 MHz, 35.19 MHz, 56.13 MHz and return loss of about -29.58, -14.5...

In this paper, we propose an artificial neural network (ANN) in conjunction with spectral domain formulation for fast and accurate determination of the resonant frequency and bandwidth of circular microstrip antenna with and without air gap. This neurospectral approach reduces the problem complexity. The results obtained from the neural model are in very good agreement with the experimental res...

In this paper we show the triangular geometry of the microstrip patch is one of the mostcommon shapes having a wide range application ranging from circuit elements to modernwireless antenna. In this paper we compare Cslot microstrip antenna an slotted equilateraltriangular microstrip antenna. Recent survey of open literature shows interesting developmentof this patch as novel ci...

The low cost, high efficiency, single-feed microstrip antenna with a two-layer substrate for circular polarization (CP) is presented. A new CP design of a singlefeed nearly square patch with two truncated square corners is also described here. The two-layer substrate consists of an FR4 dielectric layer and a foam layer. The effects of the foam substrate on the impedance bandwidth, axial ratio, ...

We have investigated the properties of thin copper and germanium layers in view of their use in microstrip gas chambers. It was found that ultra thin germanium layers with thicknesses of about 100 A provide surface resistivities in the order of 10 11 {10 14 /2. Such layers evaporated onto the micro structure of microstrip gas chambers manufactured on plastic or glass supports lead to a gain sta...