Compact Cpw‐Fed UWB Slot Antenna with Triple Band‐Notched Characteristics

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.

Kuznets curve with parabola-shaped ultra-wideband antenna with defected ground plane for communications

“…Here, the dual notched band characteristics have been included in designing the antenna by using a thin ground plane of L shape, vertical I-shaped rectangular slot in patch radiation (Shinde and Mishra, 2013) and using stepped stub impedance (Li et al, 2014). Subbarao and Raghavan (2013) present that the triple notched band characteristics have been included in antenna design by using Complementary slit ring resonator (CSRR), slot of C-shape, SRR and slit in L-shaped in ground-plane as stated in the work of Subbarao and Raghavan (2013). Vendik et al (2017) present that the triple notched band characteristics have been included in designing the antenna by using electric ring-resonators.…”

Quad notch UWB antenna using combination of slots and split‐ring resonator

“…Dual notch band characteristics is incorporated in the designed antenna by using L‐shaped thin ground plane and rectangular vertical I‐shaped slot in radiating patch and by using stepped impedance stub . Triple notch band characteristics is incorporated in the designed antenna using C‐shaped slot, pair of complimentary split‐ring resonator slot, and L‐shaped slit in the ground plane . Triple notch band characteristics are incorporated in the designed antenna using electric ring resonators .…”