A new printed G‐shaped monopole antenna for dual‐band WLAN applications

Abstract

on 0.508-mm-thick (20 mil) RT/Duroid 5870 substrate with a relative dielectric constant of 2.33. The chip components include Panasonic surface mount capacitors (1.0 ϫ 0.5 mm) of value 2C N ϭ 12 pF and inductors (1.6 ϫ 0.8 mm) of value L N ϭ 15 nH. The dimensions of the resonator with an inner diameter greater than zero as shown in Figure 1 are l 1 ϭ 6.2 mm, W ϭ 1.47 mm, and d ϭ 1.02 mm. The dimensions of the resonator with an inner diameter of zero as shown in Figure 2 are l 2 ϭ 6.93 mm and W ϭ 1.47 mm. The coupling gap spacing for both resonators is s ϭ 0.2 mm.The measurements are made using an Agilent 8510C network analyzer and the results are shown in Figure 3. The measured responses of the proposed resonators are almost identical. The loaded Q for both resonators is about 48, which approximately equals the Q for the lumped inductor at 1.2 GHz. Therefore, if the design requires a higher Q, a lower loss inductor can be used. At 1.2 GHz, the proposed resonator offers 6-dB lower insertion loss and has a maximum dimension 32% more compact than the gap coupled NRI line resonator in [5]. Compared to a conventional half-wavelength ring resonator at 1.2 GHz, the total circumference of the proposed resonator (including both upper and lower paths) is reduced by 84%. Also, due to the lumped elements there are not higher-order resonances as in the conventional ring resonator [7]. CONCLUSIONSA compact gap-coupled ring resonator using an NRI TL section has been realized. It was demonstrated that the proposed structure resonates with an inner diameter of zero. Resonance occurs when the phase delay of the upper path equals the phase advance of the lower path. It is expected that this new resonator will have many applications in the design of compact microstrip filters and oscillators. ACKNOWLEDGMENTSThe authors would like to thank M.-Y. Li of Texas A&M University for technical assistance.

Optimal Design of Dualband CPW-Fed G-Shaped Monopole Antenna for Wlan Application

“…For the proposed design here, the antenna is printed on only one side of an FR4 microwave substrate with the substrate thickness of 1.6 mm and the dielectric constant of 4.4. This construction is simpler than the presented dualband G-shaped antenna design, as reported in [21], which has a large ground plane on the side different from the Gshaped radiating patch. The main structure of the proposed antenna comprises two folded strips, denoted as L 1 and L 2 , respectively, and a CPW feeding line.…”

Printed S-Shaped Monopole Antenna for Tri-Band WLAN Application

“…By using the tapered folded geometry, the antenna's impedance bandwidths have been greatly enhanced. In literature [5][6][7], a type of interesting printed monopole antennas with the geometry of character letters, such as F-shaped and G-shaped, etc, have been designed for WLAN application. These antennas are composed of two radiating meander strips which are controlled to operating at different bands.…”

A low-loss dielectric using CaTiO₃-modified Mg_1.8Ti_1.1O₄ ceramics for applications in dielectric resonator antenna

“…The current popular designs suitable for WLAN operation in the 2.4/5.2/5. 8 GHz bands have been discussed [1][2][3]. In order to increase broadband and data rate, WiMAX (2.6/3.5/5.8 GHz) and LTE (0.7/2.3/2.5 GHz) systems have been deployed to provide mobile broadband internet services with large coverage area in many countries.…”