In this article, a novel omnidirectional compact dual band metamaterial‐inspired antenna with CPW feed has been proposed for application of GSM 1800 (1.71‐1.785 GHz/1.805‐1.879 GHz), GSM 1900 (1.85‐1.91 GHz/1.93‐1.99 GHz), UMTS (1.92‐2.17 GHz), WLAN/Wi Fi (4.9, 5, 5.9 GHz), HiperLAN1 (5.15‐5.3 GHz), and HiperLAN2 (5.47‐5.72 GHz) using a combination of meander line inductor and interdigital capacitor (IDC). The antenna consists of complimentary right/left handed (CRLH) transmission line on both sides of patch to excite zeroth order mode (n = 0). The rectangular slotted stubs act as a virtual ground for the structure using a short circuit condition at the end of the IDC. The zeroth order resonance (ZOR) frequency is mainly controlled by IDC and partially with the meander line inductor. The designed antenna operates from 1.72 to 2.22 GHz and 4.25 to 5.88 GHz with radiating size of 0.56λo × 0.35λo (32 × 20 mm2), where λo is the free‐space wavelength at ZOR frequency of 5.27 GHz. The proposed antenna offers measured impedance bandwidth (|S11| <−10 dB) of 25.3 and 18.7% at 1.95 and 5.28 GHz and covers the targeted frequency bands. The proposed structure offers omnidirectional radiation patterns are congruous throughout the working band.

In this paper, we discussed about the work done by researchers for the enhancement of performance of a multiband BPF by introducing different defected ground structure (DGS) geometries. A DGS structure on a conventional inductively coupled band pass filter is used to miniaturize the resonator. By introducing a DGS on the transversal dimension of the CPW, it enhances filter performance. The DGS cell also transforms a single band to a multiband BPF by using this structure. The design technique of the filters with the DGS can be explained at very high frequencies in GHz ranges and give very accurate simulated and measured results.

In recent years, the science of fr actal geometry has grown into a vast area of knowledge, with almost all branches of science and engineering gaining from the new insights it has provided. In this paper modified Sierpinski fr actal patch behavior has been presented and discussed. The antenna had a log periodic behavior, the log period being related to the self similarity scale factor of the antenna. These are simulated using IE3D and analyzed in order to obtain the better understanding of antenna fr actal behavior. In the Improved Design, to increase the radiating area, small triangles are drawn outside on three sides of each eq uilateral triangle. So total side length has been increased fr om 27mm to 45 mm. Now the total perimeter for improved design is 135 mm as it was for conventional antenna 81mm, keeping the antenna size same. The Sierpinski fr actal antenna with wide band behavior characteristics has been successfully designed and implemented. The proposed fr actal antenna has been designed with fifth iteration. The results exhibits the wide band characteristics in the range fr om 2.9 GHz to 4.1 GHz corresponds to 45.47% improvement in bandwidth as it is 36.37 % for the conventional antenna. The measured radiation of the proposed antenna is linearly polarized and stable throughout the band. The antenna has smooth VSWR characteristics in the band 2.95 GHz to 3.7 GHz. It has VSWR value i.e. 1.544 for improved design, as it was for conventional antenna 1.566 at 2.95 GHz. There is 2.2 % improvement in VSWR.

A novel zeroth‐order resonator (ZOR) meta‐material (MTM) antenna with dual‐band is suggested using compound right/left handed transmission line as MTM. In this article, suggested antenna consists of patch through series gap, two meander line inductors, and two circular stubs. The MTM antenna is compact in size which shows dual‐band properties with first band centered at 2.47 GHz (2.05‐2.89 GHz) and second band is centered at 5.9 GHz (3.70‐8.10 GHz) with impedance bandwidth of (S11 <  − 10 dB) 34.69% and 72.45%, respectively. At ZOR mode (2.35 GHz), the suggested antenna has overall dimension of 0.197λo × 0.07λo × 0.011λo with gain of 1.65 dB for ZOR band and 3.35 dB for first positive order resonator band which covers the applications like Bluetooth (2.4 GHZ), TV/Radio/Data (3.700‐6.425 GHz), WLAN (5‐5.16 GHz), C band frequencies (5.15‐5.35, 5.47‐5.725, or 5.725‐5.875 GHz) and satellite communication (7.25‐7.9 GHz). The radiation patterns of suggested structure are steady during the operating band for which sample antenna has been fabricated and confirmed experimentally. It exhibits novel omnidirectional radiation characteristics in phi = 0° plane with lower cross‐polarization values.

This paper presents the electrically small U-slot loaded circular microstrip patch antenna with Complementary Split Ring Resonator (CSRR). The technique of U slot loading is used for operating antenna in dual band and CSRR technique to make antenna compact and CSRR for compactness is used. The simple circular patch antenna resonates at 5.71 GHz with return loss of -11.38 dB. The proposed antenna (with U-slot and CSRR) enhanced the matching upto-37.47 dB at the 3.47 GHz and -13.7dB at the frequency 3.98 GHz circular patch antenna and U-slot loaded circular microstrip patch antenna with CSRR are simulated using Ansoft HFSS and verified with the experimental results.