Two Novel Compact Triple-Band Microstrip Annular-Ring Slot Antenna for PCS-1900 and Wlan Applications

Abstract

Abstract-This paper presents two compact ring slot antennas which are suitable for the PCS-1900 and the 2.4/5-GHz triple-band operations. The first antenna consists of three annular ring slots. The outer ring is responsible for exciting the first resonant mode whereas the middle ring excites the second resonant mode. The inner most rings, through their Y-shaped slots, create a wide upper operating band by combining the third and fourth resonant modes. To improve this antenna, we have employed circular Photonic Bandgap (PBG) structures in order to obtain a smaller slot antenna with better radiation characteristics. In this design, the cross-polarization level in the E-plane has reduced compared to the first antenna by 5.5 dB, 0.3 dB and 4 dB in the three resonant bands. Also, the crosspolarization in H-plane has reduced by an amount of 3 dB. In addition, the obtained results show that the co-polarization patterns are very similar in all three frequency bands. In both cases we have reduced the size of antennas to 56% and 42% respectively, of conventional microstrip slot antennas. The simulation results are verified by measurements.

A Bidirectional Multiband Antenna With Modified Fractal Slot Fed by CPW

“…Accordingly, the multiband antenna is desired in many systems. In the literature reviews, there are various multiband antennas that have been developed over the years, which can be utilized to achieve the objectives of multiband operation, for instance, the PIFA [1,2] for using in mobile phone application, the slot spiral antenna [3] for dual band or multiband operation, the triangle-shaped monopole antenna [4], and other [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Recently, the developing multiband antennas have been improved due to use of the fractal concept.…”

Design and Investigation of a Dual-Band Annular Ring Slot Antenna for Aircraft Applications

“…In recent years, many annular ring slot antennas have been developed for dual-frequency operations [1][2][3][4][5][6][7][8][9][10][11][12][13], and several of methods have been used to create antenna with dual-band characteristic. One of the typical methods is to introduce another concentric annular-ring slot [1][2][3][4][5][6].…”

“…One of the typical methods is to introduce another concentric annular-ring slot [1][2][3][4][5][6]. However, in order to obtain the dual-band input impedance matching, some other structures should be embedded into the antenna, such as circular photonic bandgap (PBG) structures [3], tree-shaped coupling strip with branches [5] and a cross-slot [6].…”

“…One of the typical methods is to introduce another concentric annular-ring slot [1][2][3][4][5][6]. However, in order to obtain the dual-band input impedance matching, some other structures should be embedded into the antenna, such as circular photonic bandgap (PBG) structures [3], tree-shaped coupling strip with branches [5] and a cross-slot [6]. There are many other methods to generate dual-band function, such as using triplate feed [7,8], introducing a back-patch [9], utilizing pin diodes [10], changing the compact annular ring slot structure [11][12][13].…”

High-Gain Slot Antenna With Parasitic Patch and Windowed Metallic Superstrate

“…Thus they are mostly and popularly used in military (aircraft, spacecraft, and missile) and commercial (mobile radio and wireless communications) applications [1][2][3][4][5][6][7]. However, they still suffer from the disadvantages of bi-directional radiation, low gain and would not be suitable for some applications, such as point-to-point (p2p) communications.…”