Circularly polarized rectangular dielectric resonator antenna fed with unequal parallel microstrip lines for Wi‐MAX applications

Abstract

In this article, a circularly polarized rectangular dielectric resonator antenna (RDRA) is proposed for Wi‐MAX applications. Unequal parallel Microstrip lines are used as feed circuit. In the proposed structure fundamental mode similar to TE111 polarized in two orthogonal directions to generate orthogonal modes are generated. The proposed structure shows measured input impedance bandwidth (S11 < −10 dB) and axial ratio (AR < 3 dB) of 23.8% (at center frequency 3.31 GHz) and 9.2% (at center frequency 3.46 GHz), respectively. It exhibits excellent radiation pattern and average gain of 5.5 dB in working frequency range. The proposed design is suitable for Wi‐MAX applications (3.3–3.7 GHz). Radiation efficiency over 95% (3.3–3.6 GHz) is achieved in the proposed structure. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1182–1188, 2017

Stacked rectangular dielectric resonator antenna with different volumes for wideband circular polarization coupled with step‐shaped conformal strip

“…The reason is single feeding has simple feed network, required less space compared with the dual/ multiple or sequential feeding techniques and easily incorporated in the wireless systems. The literature shows that with the use of single or modified single feeding network along with conventional or deformed shape of DR, the antenna designers can obtain CP filed in DRA such as stair‐shaped DR with CP bandwidth of 10.6%, rotated stair‐shaped DR having CP bandwidth of 6%, semi‐eccentric annular DR having CP bandwidth of 5.71%, offset cross‐slot‐coupled along with cylindrical DR having 4.7% of CP bandwidth, by using a special feeding arrangement that is, off‐centered microstrip feedline slot‐couple in cylindrical DRA to obtain the CP bandwidth of 3.47% in broadside direction, phi‐shaped slot coupled having modified ground plane and modified single feed along with cylindrical DR are utilized to achieve CP bandwidths of 6.1%, by using logarithmic spiral slots in the ground and excited with coaxial probe achieved CP bandwidths of 6.2% in cylindrical DR, and a rectangular DR using two unequal conformal strips associated with microstrip line to achieve 9.2% of CP bandwidths . Although, a few articles have been reported for achieving the ISM 2400 band applications by using coaxial probe and aperture coupled techniques but other feeding techniques also required for current scenario of wireless applications.…”

A New Bidirectional Wideband Circularly Polarized Cylindrical Dielectric Resonator Antenna using Modified J-shaped Ground Plane for WiMAX/LTE Applications

“…A dual feeding technique (DFT) shows wide AR-bandwidth as compared to SFT but suffers complex geometry and large radiator size [10]. In recent years, antenna engineers focused on wideband circularly polarized DRA by using single feeding techniques which have simple geometry and feeding network [11][12][13][14][15][16]. It is confirmed from previously published papers that wide AR-bandwidth can be achieved by using a combination of SFT with the modified shape of DRA or combination of the conventional shape of DRA with modified SFT.…”

“…Example A -SFT with modified shaped DRA: A stair-shaped DRA using SFT with slot excitation achieves 10.6% CP bandwidth reported in [11], whereas in [12], a wideband CP having trapezoidal DRA with ARbandwidth of 21.5% and excited with SFT has been presented. Example B -conventional shape DRA with modified SFT: In [13], a rectangular shape of DRA excited with an extended microstrip feed to acquire 9.2% of AR-bandwidth, [14] uses aperture slot and modified microstrip feed line to excite the rectangular DRA showing 12.03% of AR bandwidth. Example C -modified SFT with modified shaped DRA: using rotated stair DRA and excited with modified SFT having a slot on the ground plane has been reported with AR-bandwidth of 18.2% [15], stair-shaped DRA with extended microstrip feed line excitation exhibiting 22% AR-bandwidth is shown in [16].…”

Circularly polarized rectangular DRA coupled through orthogonal slot excited with microstrip circular ring feeding structure for Wi-MAX applications

“…Compared with dual feeding technique, single feeding show more attention to the antenna designers because it easily reduces system complexity and also ability to enhance axial ratio bandwidth. To enlarge the CP bandwidth in DRA by using single feeding technique, several methods have been reported …”

“…To enlarge the CP bandwidth in DRA by using single feeding technique, several methods have been reported. [12][13][14][15] In this article, a wideband circularly polarized rectangular dielectric resonator antenna (RDRA) has been presented for Wi-MAX band applications. The proposed antenna coupled through an orthogonal slot, that is, plus-shaped (1) slot and excited with a new microstrip circular ring.…”