Dual-Band Stacked Annular Slot/Patch Antenna for Omnidirectional Radiation

Abstract

This letter presents the design of a new omnidirectional antenna, which is composed of annular slot and annular patch stacked together for dual band operation at 2.5 GHz and 3.5 GHz. The influence of the antenna parameters on the dual band operation is given with simulations. A prototype of the proposed antenna was manufactured with FR4 substrates for the purpose of demonstration. The measured reflection coefficient exhibits dual band operation at 2.32 GHz with fractional bandwidth of 19.3%, and at 3.59 GHz with fractional bandwidth of 18.6%. The stable measured omnidirectional radiation patterns can be obtained at both frequencies. The agreement between the measured and simulated patterns can be observed from the experimental results.

A novel stacked patch antenna with dual band and diverse pattern characteristics

“…Some of the previously reported antennas are summarized in Table for a comparison with the proposed work. The antennas in References all exhibit dual‐band characteristics, but none of them have the feature of diverse patterns. In Reference , a cylindrical dielectric resonator antenna is designed with enhanced gain and pattern diversity, however the disadvantages of single band and high profile limit the application range of the dielectric antenna to some extent.…”

“…For the antennas in References , pattern diversity and low profile characteristics can be realized simultaneously, but these antennas have only one resonant bandwidth. For the proposed design, stacked patches are introduced to obtain dual‐band characteristic with a frequency ratio of 2, much higher than the frequency ratio shown in References . Moreover, four PIN diodes are used to realize the pattern diversity and high radiation efficiency can also be obtained in the proposed DBAPD.…”

“…In this paper, a novel stacked patch antenna with compact structure is proposed to meet dual‐band and diverse patterns requirements. The frequency ratio of the proposed antenna is 2, which is larger than the antennas in References . The center frequency of lower band f 1 is 2.45 GHz, which mainly depends on the coupling between the upper circular patch and lower turnstile‐shaped patch.…”

“…A dual‐band dual‐polarized antenna is investigated in Reference , which consisted of a circular patch with a radius of 48 mm, eight rectangle slots and eight shorted metal pins, the measured results show that the fabricated antenna has excellent dual polarization feature and omnidirectional radiation patterns, but the bandwidths of 18 MHz and 32 MHz limits the application range of the antenna. In order to solve the problem of narrow band, stacked annular patch is introduced to design a slot antenna with dual band performance and omnidirectional radiation in Reference , the experimental fractional bandwidth is 19.3% and 18.6%, however the profile height of the designed antenna is up to 21 mm. In Reference , a novel circular patch antenna with circularly periodic mushroom units is proposed.…”

CPW-Fed Compact Multiband Monopole Antenna for Wlan/Wimax/X-Band Application

“…With the development of multiple wireless communications standards, group of engineers focus their interests on how to design multiband antennas that can be integrated as many standards such as WLAN, WiMAX, and satellite communication as possible into a single wireless terminal device. In order to meet these requirements, various types of promising multiband antenna designs were studied in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Planar printed monopole antennas with various structures in [1][2][3] have become popular candidates in multi-frequency applications for its advantages of low-cost, low-profile, and easy fabrication, whereas the antenna size is relatively large which is not suitable to be installed in mobile wireless terminals.…”