Wide-band E-shaped Patch Research Articles

Wideband E-shaped Patch Antennas for Advanced Wireless Terminals

Low-profile patch antennas have become ubiquitous in wireless terminals, especially as devices have become smaller and demand more functionality out of their RF subsystems. While their shape and size is attactive for many applications, their narrow bandwidth hinders their usage in many systems. With the rise of computer-aided design, many patch antenna design concepts have been presented with enhanced bandwidth capabilities. The E-shaped patch antenna, whose original shape presented in the early 2000’s resembles the letter E, offers compelling performance with reasonable manufacturing complexity. In it most basic form, this antenna was linearly polarized and either wideband or dual-band. Over the last two decades, many variations of the E-shaped patch have been presented in literature: circularly polarized, miniaturized, frequency reconfigurable, or even polarization reconfigurable. This paper summarizes these efforts in realizing novel functionalities with a relatively simple design geometry.

Notch Band Antenna for Wireless Applications

In this project a wideband E-shaped patch antenna using Uslots is to be described. A patch antenna, also known as a rectangular micro strip antenna, is an antenna with a low profile, can be mounted on a flat surface. A wide range of radiation pattern can be achieved with this antenna and it is inexpensive. The wide-band mechanism is explored by investigating the behavior of the currents on the patch. This Eshaped antenna is slotted by using U-slots. A notch band characteristic can be achieved by using U slots in 50 ohms feed lines. A parametric study is presented with the results showing that the antenna can be operated at 1.0 GHz up to 12.0 GHz frequency band with return loss of -30.5 dB. Parameters such as S11 and VSWR also have been improved. The design and simulation of antenna is done by using Ansoft HFSS.

Circular Polarization Reconfigurable Wideband E-Shaped Patch Antenna for Wireless Applications

A polarization reconfigurable E-shaped patch antenna with wideband performance is proposed in this communication. The antenna is capable of switching its polarization from right hand circular polarization (RHCP) to left hand circular polarization (LHCP) and vice versa. Its structure is simple and consists of a single-layer single-feed E-shaped patch and two RF switches placed at appropriate locations in the slots. The design targets the WLAN IEEE 802.11 b/g frequency band (2.4-2.5 GHz) being used in various wireless communication systems. Full wave simulation is used for the antenna analysis, and a prototype of the antenna with an integrated DC biasing circuit has been fabricated and tested. Good agreement is obtained between simulated and measured results. The antenna exhibits a 7% effective bandwidth from 2.4 GHz to 2.57 GHz with a 8.7 dBic maximum gain. The antenna radiation symmetry is maintained upon switching between the two circular polarization modes.

Comments on "Wide-band E-shaped patch antennas for wireless communications"

For original paper see Yang, F. et al., ibid., vol.49, p.1094-1100 (2001). The writer disputes the novelty claimed by Yang et al. for the E-shaped patch antenna in wireless communications. He points out that it is a special case of the double C-patch antenna which he invented in 1994 (Sanad, M. Proc. IEEE AP-S Symp., p.2116-19, 1995). He refers to papers and patents which describe the further development of the double C-patch antenna and also its application as the basis of internal integrated antennas for portable wireless communication equipment, including cellular phones.

Authors' Reply [Comments on "Wide-band e-shaped patch antennas for wireless communications"

For original paper see Yang, F. et al., ibid., vol.49, p.1094-1100 (2001). For comment see Sanad, M., ibid., p.2541. The authors express their regret that they did not refer to Dr. Sanad's work and thank him for his interest in their paper. They acknowledge the extent of his work on the double C-patch antenna and its application in the field of mobile communication.

Wide-band E-shaped patch antennas for wireless communications

This paper presents a novel single-patch wide-band microstrip antenna: the E-shaped patch antenna. Two parallel slots are incorporated into the patch of a microstrip antenna to expand it bandwidth. The wide-band mechanism is explored by investigating the behavior of the currents on the patch. The slot length, width, and position are optimized to achieve a wide bandwidth. The validity of the design concept is demonstrated by two examples with 21.2% and 32.3% bandwidths. Finally, a 30.3% E-shaped patch antenna, resonating at wireless communication frequencies of 1.9 and 2.4 GHz, is designed, fabricated and measured. The radiation pattern and directivity are also presented.