In this article, a novel planar slot antenna is presented with band‐notched characteristic for ultra wideband applications.The antenna is fed by coplanar wave guide. A “C” shaped slot etched on the radiating patch to avoid interference from WLAN and HYPERLAN/2 bands. The antenna has measured bandwidth ranging from 3 to 10.6 GHz for VSWR ≤ 2. The antenna has omni directional radiation pattern in H‐plane and bi‐directional in E‐plane. The group delay of antenna is less than 1 ns except in the notched band. Good agreement is found between measured and simulated results. The antenna can be easily integrated with microwave circuitry and is a good for UWB applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1292–1296, 2012

No abstract

No abstract

No abstract

the passband edge-see Figure 7. For the cases of less-steeper transition, simulated reflectance in the passband could be even as good as 220 dB in maximum. Thus, the capacitors offer a way of tuning the filter and adaptation to specific requirements. With modern digitally tuned capacitors available, this creates a possibility to remotely modify the filter during its operation, what is a necessity, for example, in a fully software defined radio.A second possibility of tuning the filter is through changing the height at which the cover is placed above the filter circuit. In Figure 8, there are shown measured transmittances for a few different heights. It can be seen that moving the cover further from the filter causes the stopband to shift to lower frequencies. This happens, because the electric length of a microstrip line increases with rising distance to the cover, thus the frequency of the wave experiencing the parallel resonance becomes smaller. CONCLUSIONThis article introduces a novel planar stopband filter, based on a modified meander microstrip line, with additional coupling capacitors, intended to operate at low frequencies from the UHF band. The filter is of compact size and is able to provide high attenuation of an undesired distorting signal with low-insertion loss in a nearby useful band. It is important, that the filter can be easily tuned and its stopband shaped, making it a good solution for equipment requiring high flexibility, and allowing to quickly compensate imperfections of technology or materials in produced units. ACKNOWLEDGMENTSABSTRACT: A novel compact coplanar waveguide-fed antenna is presented with triple band-notched characteristics. A C-slot is etched in a novel patch to avoid interference from WiMAX band. By using pair of CSRR slots and pair of L-shaped slits in ground plane, two notched bands for WLAN and ITU 8 GHz bands are obtained, respectively. The antenna has bandwidth of 2.8-11.2 GHz with three notched bands of 3.3-3.7 GHz, 5-6 GHz, and 8-8.4 GHz to avoid interference from WiMAX, WLAN, and ITU 8 GHz bands, respectively. The antenna has good impedance matching and stable radiation patterns. Good agreement is reached between measured and simulated results.