This article presents the results of a compact modified triangular CPW-fed antenna that exhibits multioctave performance. This modification significantly improves the antenna's impedance bandwidth by 198% over an ultra-wideband (UWB) frequency range from 3.06 to 35 GHz. The return-loss (S11) performance over this frequency range is designed to be better than −10 dB. These characteristics make the proposed antenna an excellent candidate for numerous UWB applications and next generation communication systems. The key physical parameters affecting the antenna's frequency characteristics have also been investigated to determine optimum antenna performance. The antenna's measured return loss and E-plane and H-plane radiation patterns show a very good correlation with the requirements of UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:69–72, 2015

A compact modified triangular CPW‐fed antenna with multioctave bandwidth

A novel compact-sized ultra-wideband (UWB) bandpass filter (BPF) is proposed in this paper. The proposed BPF is highly selective and is able to eliminate WLAN signals from 5.15-5.35 GHz, and downlink of X-band satellite communication signals from 7.25-7.75 GHz. Generally, a multiple-mode resonator (MMR), comprised of a U- shaped line, with two high impedance stubs connected to it, and one stepped impedance resonator placed in the center of the U-shaped line is used to generate five resonate modes in the desired band (range of 3.1- 10.6 GHz). Two transmission zeroes (TZs) are also placed to improve the bandage steepness. One of these TZs is with a lower cutoff frequency and the other TZ is with a higher cutoff frequency. A C-shaped open- circuited stub without adding any circuit size is parasitically coupled to the inner part of the U-shaped stub and can provide a narrow notched band at any desired frequency with appropriate bandwidth through the dimension of the parasitic element and its distance to the MMR. This C- shaped stub is used to reject WLAN signals. Furthermore, UWB passband is fully covered using asymmetric feed lines with defected interdigital coupled-lines. At the same time, another notched-band is implemented to reject X-band signals. Slots in the ground plane and input/output ports are etched to increase coupling and improve the in- band performance. The proposed BPF in the study covers UWB span completely and eliminate two bands of unwanted WLAN and X-band signals, with good linearity in the passband. A prototype filter was fabricated and its performance was measured to validate the simulation results.

http://jce.shahed.ac.ir/article_354_c04aa139f3c421cdc009d5293f1fe97b.pdf

A Compact UWB Bandpass Filter with High Selectivity and Dual Notched-Band

In this paper, a novel CPW-fed antenna is presented for UWB applications. The antenna mainly comprises of a simple circular patch and a modified ground plane. The inclusion of two novel symmetrical rectangular slots with inner area of 3×2.8 mm 2 to the top corners of the antenna creates a new path for the current and consequently leads to the bandwidth enhancement. A rectangular stub is also adopted to further broaden the antenna impedance bandwidth. The proposed antenna has a compact size of 20×20×1.6 mm 3 and covers the wide frequency band of 3-23.5 GHz (154%). Constant gain and suitable radiation patterns are observed for the presented antenna. Good agreement between the simulated and measured results clearly shows the validity of the proposed structure. The design steps and bandwidth enhancement process are discussed in detail.

http://jce.shahed.ac.ir/article_295_9eff800b90f11b218ef9071ca4d3bbdb.pdf

Nourinia Javad

Papers

Compact CPW-fed Circular Patch Antenna for UWB Applications