Electrically Small and Low Cost Smart Antenna for Wireless Communication

Liu, Haitao; Gao, Steven; Loh, Tian Hong

doi:10.1109/tap.2011.2180300

Cited by 96 publications

(49 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although the proposed structure is totally different to those in [8,9,24], the operation principle to create switched beams is similar to the steering of the radiation pattern are all caused by controlling the coupling between the driven element and parasitic elements. Therefore, similar analysis method can be used to analyze the operation principles of the "CD-ESPAR".…”

Section: Switched Beams Using Espar Structurementioning

confidence: 99%

“…One potential technique is the electronically steerable parasitic array radiator (ESPAR), which consists of one driven element and several parasitic elements with reactive or resistive loads and only one radio frequency (RF) port [8][9][10][11]. By controlling the loads of parasitic elements, the beam direction of an ESPAR can be changed electronically.…”

Section: Introductionmentioning

confidence: 99%

“…In [12], a homogeneous dielectric material is used to embed the antenna, which reduces the whole size of the antenna at the expense of efficiency degradation. Using folded monopoles or top-disk loaded monopoles can further reduce the height of ESPARs to about 0.1 [9,13,14]. A low-profile multi-mode small antenna driven ESPAR with a height of 0.063 is proposed in [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Planar Ultrathin Small Beam-Switching Antenna

Zhang

Gao

Luo

et al. 2016

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

Abstract-A novel planar ultra-thin electronically steerable parasitic array radiator (ESPAR) is presented in this paper. Through theoretical analysis of the electric fields of orthogonally crossed dipoles in phase quadrature, it is found that the crossed dipoles radiate linearly polarized (LP) wave with a rotational electric field in the azimuth plane. This characteristic is then utilized to design a planar crossed dipole ESPAR, termed as "CD-ESPAR". Furthermore, a simple but effective impedance matching method is also proposed and analyzed. To verify these concepts, a prototype with compact size and very low profile (0.42 0.42 0.006 ) resonating at 2.3GHz is designed, fabricated and measured. The measured results indicate that the proposed antenna achieves more than 17.8% impedance bandwidth and can produce four directional beams, covering the whole azimuth plane. Owing to its planar ultra-thin structure, compact size, electronically beam-switching ability, low power and low cost characteristics, it is promising for applications in wireless communications.

show abstract

Section: Switched Beams Using Espar Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Planar Ultrathin Small Beam-Switching Antenna

Zhang

Gao

Luo

et al. 2016

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the above advantages, ESPARs have received increasing research attention in recent years [10]- [15]. In [10]- [12], single-fed ESPARs are considered, where in [11] the calculation of each tunable load and the feeding voltage for the central element is given.…”

Section: Introductionmentioning

confidence: 99%

“…In [10]- [12], single-fed ESPARs are considered, where in [11] the calculation of each tunable load and the feeding voltage for the central element is given. In [12], it is shown that the currents at each antenna port of the ESPAR array can be considered as the input signals of the MIMO systems, which greatly simplifies the design of ESPARs.…”

Section: Introductionmentioning

confidence: 99%

Tunable load MIMO with quantized loads

Masouros

Sellathurai

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

View full text Add to dashboard Cite

Abstract-In this paper, we study the application of precoding schemes on practical electronically steerable parasitic array radiators (ESPARs), where quantized load impedances are considered for each antenna element. The presence of quantization in the loads results in a performance loss for practical ESPARs. To alleviate the performance loss, we propose to approximate the ideal current vector with convex optimization, where it is further shown that the optimality is achieved by optimizing the feeding voltages only. Specifically, we obtain the closed-form expression when single-fed ESPARs are assumed. Numerical results show that the proposed quantization-robust scheme can achieve a significant performance gain over ESPARs with quantized loads.

show abstract

Circularly Polarized Antennas

Laheurte¹

2011

Compact Antennas for Wireless Communications and Terminals

View full text Add to dashboard Cite

Circularly polarized (CP) antennas are a type of antenna with circular polarization. Due to the features of circular polarization, CP antennas have several important advantages compared to antennas using linear polarizations, and are becoming a key technology for various wireless systems including satellite communications, mobile communications, global navigation satellite systems (GNSS), wireless sensors, radio frequency identification (RFID), wireless power transmission, wireless local area networks (WLAN), wireless personal area networks (WPAN), Worldwide Interoperability for Microwave Access (WiMAX) and Direct Broadcasting Service (DBS) television reception systems. Lots of progress in research and development has been made during recent years.The CP antenna is very effective in combating multi-path interferences or fading [1,2]. The reflected radio signal from the ground or other objects will result in a reversal of polarization, that is, right-hand circular polarization (RHCP) reflections show left-hand circular polarization (LHCP). A RHCP antenna will have a rejection of a reflected signal which is LHCP, thus reducing the multi-path interferences from the reflected signals.The second advantage is that CP antenna is able to reduce the 'Faraday rotation' effect due to the ionosphere [3,4]. The Faraday rotation effect causes a significant signal loss (about 3 dB or more) if linearly polarized signals are employed. The CP antenna is immune to this problem, thus the CP antenna is widely used for space telemetry applications of satellites, space probes and ballistic missiles to transmit or receive signals that have undergone Faraday rotation by travelling through the ionosphere.Another advantage of using CP antennas is that no strict orientation between transmitting and receiving antennas is required. This is different from linearly polarized antennas which are subject to polarization mismatch losses if arbitrary polarization misalignment occurs between transmitting and receiving antennas. This is useful for mobile satellite communications where it is difficult to maintain a constant antenna orientation. With CP, the strength of the received signals is fairly constant regardless of the antenna orientation. These advantages make CP antennas very attractive for many wireless systems.

show abstract

Electrically Small and Low Cost Smart Antenna for Wireless Communication

Cited by 96 publications

References 16 publications

Planar Ultrathin Small Beam-Switching Antenna

Planar Ultrathin Small Beam-Switching Antenna

Tunable load MIMO with quantized loads

Circularly Polarized Antennas

Contact Info

Product

Resources

About