Circularly Polarized Stacked Patch Antenna Research Articles

A Lightweight Broadband Circularly Polarized Stacked Patch Antenna Formed by Meshed Aluminum Disks for Inter-Satellite Communication

A Lightweight Broadband Circularly Polarized Stacked Patch Antenna Formed by Meshed Aluminum Disks for Inter-Satellite Communication

A Circularly Polarized Stacked Patch Antenna for Dual Band L1 & L2 GPS Applications

A Circularly Polarized Stacked Patch Antenna for Dual Band L1 & L2 GPS Applications

Wideband Single-Fed Circularly Polarized Stacked Patch Antenna With L-Shaped Stub

A wideband single-fed circularly polarized (CP) stacked patch antenna with an L-shaped stub is presented. The CP antenna is made up of the bottom gradient microstrip transmission line, middle driven patch and top square radiation patch. The driven patch with an L-shaped stub and opening slot can achieve a wideband CP radiation which is different from a conventional patch. The presented CP stacked patch antenna maintains good directional radiation, while featuring wideband CP radiation. The final tested results indicate that the presented CP antenna has significant performance with a −10 -dB impedance bandwidth of 42.1% (4.26-6.53 GHz), a 3-dB AR bandwidth of 26.0% (4.36-5.66 GHz) and broadside peak gain of 8.6 dBic. Moreover, the fifth-generation (5G) N79 band (4.4-5.0 GHz) and 5G wireless local area network (WLAN) band (5.15-5.35 GHz) can be covered by the operating bandwidth of the presented CPantenna.

Wideband Circularly Polarized Stacked Patch Antenna Based on TM₁₁ and TM₁₀

A wideband circularly polarized (CP) stacked patch antenna based on TM₁₁ and TM₁₀ is proposed in this article. This four-port antenna consists of a circular patch and a square patch, where the square patch is located above the circular patch. Taking into account the mutual coupling between four ports, the active reflection coefficient (ARC) is adopted to describe the impedance matching of the antenna, and a simplified form of ARC is derived. The abnormal electric field distribution generated in the square patch is attributed to the superposition of the electric fields of two orthogonal TM₁₀ modes, which is theoretically verified. Due to the coupling between TM₁₁ mode and TM₁₀ mode, a new resonance mode appears in a square patch, where the abnormal electric fields on the two diagonals are generated simultaneously. The effect of the square patch on the circular patch is equivalent to a capacitor at the lower frequency end and the higher frequency end of &#x2212;10 dB impedance bandwidth, while it acts as an inductor at the middle frequency band. Besides the horizontal patch of <inline-formula> <tex-math notation="LaTeX">$\lceil $ </tex-math></inline-formula>-shaped feed is sandwiched between two radiators to enhance coupling. Finally, a wideband feed network composed of Wilkinson power divider and phase shifter is devised to provide four signals of equal magnitude and quadrature phase for proposed antenna. To verify the design concept, a prototype is fabricated and measured. The results show that left-hand circularly polarized (LHCP) radiation is achieved. The 3 dB gain variation bandwidth is 44.6&#x0025;, ranging from 1.48 to 2.33 GHz, in which VSWR &#x003C; 1.5 and AR &#x003C; 1.5 dB. Besides the peak gain is 9.5 dBic and antenna efficiency is not less than 64&#x0025;.

Design of a wideband single-layer partially reflective surface for a circularly-polarized resonant cavity antenna

This paper presents the design of a wideband single-layer partially reflective surface (PRS) for a circularly-polarized (CP) resonant cavity antenna (RCA). The proposed single layer double-sided PRS structure has complementary design which results in an increase in the 3-dB gain bandwidth of the antenna over a wide bandwidth due to creating both inductive and capacitive features. Indeed, this complementary structure gives opposite phase behavior which leads to a reverse phase gradient over a wide range of frequencies. Instead of using conventional multi-layer PRS structures or PRSs with thick unit cell for broaden the bandwidth, we have used a thin single-layer PRS structure with the capability to enhance the antenna gain over a wide bandwidth. A CP stacked patch antenna (SPA) is used as a main radiating element inside the RCA structure. To verify the significant effect of the proposed PRS on the antenna performance, the entire RCA structure is fabricated and the results show a reasonable agreement between simulations and measurements. The measurement results show an 3-dB axial ration (AR) and impedance bandwidths of 21% and 32%, respectively. The antenna gain is more than 10.5 dBic over the 3-dB gain bandwidth from 5.8 to 7.3 GHz, i.e 22.9%, with a peak gain of 13.2 dBic.

An SISL Sequentially Rotated Feeding Circularly Polarized Stacked Patch Antenna Array

A substrate integrated suspended line (SISL) circularly polarized stacked patch antenna and array is proposed. The stacked patch is introduced to achieve impedance matching and circular polarization. A windmill slot is etched on the driven patch to generate resonant frequencies of 5.05 and 5.3 GHz. Another resonant frequency of 6.5 GHz also exists due to the slot and driven patch. The proposed antenna is based on five dielectric layers, among which two layers are hollowed. On the basis of the measured results of the antenna element, the fractional impedance bandwidth of 28.3% from 4.8 to 6.38 GHz and 3 dB axial ratio (AR) bandwidth from 5.29 to 6.02 GHz are obtained. In addition, the antenna gain is larger than 8 dBic. A sequential rotation feeding network with 90° phase difference between each output port is presented to feed the antenna array with four elements. For the proposed antenna array, the measured results agree well with the simulated results. In the impedance bandwidth from 5.03 to 6.16 GHz and 3 dB AR bandwidth from 5.13 to 6.2 GHz, the antenna peak gain ranges from 12 to 13.8 dBic.

Design and Analysis of Dual Band Circularly Polarized Stacked Patch Antenna for GPS Application

In communications, antennas are the very important equipments are necessary to generate a communication system. Antennas are used in several applications like satellite communications etc. The design specifications of the antenna are considered using the transmission line model and designed with stacked square patches for multiple band operation with improved impedance matching. The Diagonal feed divides the given field into two orthogonal modes with equal magnitude and equal phase shift. The feed position is then optimized to attain the small axial ratio necessary to attain circular polarization at required frequency. The antenna has been designed at two different frequency bands with center frequencies of 1575 MHz and 1176 MHz. So the dual band circular polarization has been successfully incorporated into two square patches.

Broadband Circularly Polarized Stacked Patch Antenna for Universal UHF RFID Applications

Broadband Circularly Polarized Stacked Patch Antenna for Universal UHF RFID Applications

Miniaturized Circularly Polarized Stacked Patch Antenna on Reactive Impedance Surface for Dual-Band ISM and WiMAX Applications

This paper proposes a compact microstrip patch antenna for operating in 2.4 GHz ISM and 3.5 GHz WiMAX bands with circularly polarized (CP) radiation. The CP radiation in dual-bands is a result of two multilayered truncated corner stacked square patches, while the reactive impedance surface (RIS) is used for antenna size miniaturization for the lower operating frequency band. Since the overall lateral antenna dimensions are controlled by the lower frequency band (higher wavelength), reducing the electrical size of the antenna for lower band results in overall smaller antenna dimensions. The measured 3-dB axial ratio bandwidths of the in-house fabricated antenna prototype are 6.1% (2.40–2.55 GHz) for the lower band and 5.7% (3.40–3.60 GHz) for the upper band, while the 10-dBS11bandwidths for the two bands are 8.1% (2.39–2.59 GHz) and 6.9% (3.38–3.62 GHz), respectively. The maximum gain at boresight for the lower band is 2.93 dBic at 2.5 GHz, while the gain for the upper band is 6.26 dBic at 3.52 GHz. The overall volume of the proposed antenna is 0.292λo × 0.292λo × 0.044λo, whereλois the corresponding free-space wavelength at 2.5 GHz.

Single-Fed Low Profile Broadband Circularly Polarized Stacked Patch Antenna

A simple technique is developed in this communication to increase the axial ratio (AR) bandwidth and achieve good impedance matching of a single-fed low profile circularly polarized (CP) stacked patch antenna. The proposed antenna is composed of a driven patch layer and a parasitic patch layer. The driven patch layer consists of a truncated main patch, a parasitic patch and a probe feeding structure while the stacked patch layer is comprised of five patches. The proposed antenna combines the attractive features such as low profile, wide impedance and AR bandwidths, high gain as well as easiness of design, manufacture and integration. The antenna operating at 6 GHz band is designed and fabricated on an FR4 substrate and the overall volume is 0.8 λ 0 ×0.8 λ 0 ×0.09 λ 0 . Measured results show that the antenna achieves an impedance bandwidth of more than 30% for dB, a 3-dB AR bandwidth of about 20.7%, and a gain level of over 7.9 dBi within the 3-dB AR bandwidth.