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In the free space optical communication system with optical phased array antenna, the performance of acquisition tracking pointing subsystem is affected by the two conflicting performance of optical beam steering precision and optical beam steering range. The novel cascaded optical phased array antenna integrates a programmable phased wedge and an usual optical phased array together. For the novel...
This paper proposes a novel heart-shaped dual band-notched UWB antenna with compact and simple structure. The antenna comprise of a microstrip feeding line, a heart-shaped patch to achieve UWB characteristic, and a defected ground with bevels to obtain good impedance match and stable gain in the operating band. The band-notched characteristic is achieved by a U-shaped slot on the patch and a pair...
Numerical analysis of the near-field power transfer using multi-antennas is performed based on the scattering parameters for an equivalent circuit model of multi-port networks. The transfer power efficiency is derived by using the multi-port scattering parameters. Since the multi-port scattering parameters are easily measured by a vector network analyzer and calculated by a full-wave numerical analysis,...
In order to solve the conflict between radar cross section (RCS) reduction and radiation performance of microstrip antenna, a novel low RCS microstrip antenna based on circle slot with rectangle slot is presented in this letter. Simulation and measured results show that this novel antenna can not only guarantee the antenna radiation performance, but also reduce the RCS of the antenna significantly.
Planar phased array antennas have been implemented. The current distribution of element antenna in azimuth plane, which is scan plane, adopted Taylor distribution. Optimizing method is used to design the current distribution of array antenna elements in the elevation, which is non-scan plane, in terms of the pattern shaping requirements. 4-bit digital phase shifters are used to control the scanning-beam...
In order to solve the problem that most of the directions-of-arrival (DOA) algorithms are based on the prior knowledge of source number and the estimation error of source number leads to the degradation of DOA algorithm performance, a conformal array DOA algorithm with unknown source number is proposed. This method is realized by introducing the pseudo expected signal. The optimum weight deduced by...
Aperture coupling is one of the commonly used techniques to minimize the mutual interference between the antenna and the feed. We have demonstrated before that the feed could be two serial-connected apertures and the antenna could be composed of a ring and a patch. In this paper, another possible configuration, the parallel-connected apertures with the ring-patch antenna is investigated.
This paper presents a novel multi-resolution composite array (MRCA) concept for high resolution digital beamforming (DBF) with much less elements than conventional uniform linear array. MRCA examples are presented and compared to conventional full-filled uniform linear arrays and multiplicative linear arrays to show the novelty and effectiveness.
In this paper, a reflector antenna fed with a double-ridged conical horn which aims to work from 10 to 40 GHz is proposed. The simulated horn structure is characterized by its being relatively compact in size, making it versatile in many applications. In addition, a quadruple-ridged conical feed horn is also introduced in the paper as a supplement.
An approach of reducing the size of slot antennas has been proposed, which is based on the concept of “open circuit plane” by removing half of the slot antennas. Several examples have been examined to demonstrate the effectiveness of size reduction for slot antennas.
This paper presents the design and implementation of a novel broad bandwidth endfire antenna with log-periodic directors. The feeding structure of the proposed antenna includes a balun which is formed using a pair of microstrip to slotline transitions. The proposed antenna has three resonant frequencies in the operating frequency band. Both simulation and measurement results show that the operating...
A compact dual-band circularly polarized (CP) square-ring slot antenna with wide angel CP performance is proposed. The antenna is a two-layer structure. A cross strip is placed in the centerline of the slot to achieve a compact size. Two different kinds of perturbations are applied to the slots on the diagonal line of the slots for splitting the fundamental mode into two degenerate resonant modes...
This letter introduces a Sum and Difference Network working at the centre frequency of 35.5GHz of Ka-Band. The Monopulse radar needs to be fed with the Sum and Difference Network for its requirement for sum and difference signals. Due to the requirement for sum and difference signals, the Monopulse radar was added to be fed with the Sum and Difference Network In this paper, the proposed structure...
In this paper, a high gain array antenna, consisting of two layers, using Giuseppe Peano Fractal Configuration as its radiation elements is designed, fabricated, and measured. This fractal array antenna consists of 8 ×8 fractal elements, is fed by a microstrip corporate feeding network, and works at frequency of X frequency band (10.0GHz). Both simulation and measurement show, the proposed fractal...
Microstrip patch antenna has compact structure, low weight and easy to integrate and has good performance on polarization characteristic. It has become an important part of antenna research. But microstrip antenna is rarely used in W band because of its large loss and port isolation. The design of a dual-polarized microstrip patch antenna for W band is presented in this paper. This 2×2 antenna has...
A novel wideband circularly polarized (CP) microstrip antenna with pattern improvement is proposed. Four vertical conductive walls surrounded with the radiation patch and four metal isosceles triangle patches located at top of the radiation patch are employed for widening beamwidth. To achieve the miniaturization of the antenna, four slots etched along the diagonals of radiation patch and the folded...
This manuscript describes the design and implementation of miniaturized slot antenna with two-stage impedance matching circuit for 800MHz and 2GHz up and down link multiband application. The impedance matching circuit is based on the 2-stage band-pass filter (BPF). We fabricated this multi-band slot antenna on FR4 substrate and measured the radiation patterns and frequency characteristics. Also, the...
Two kinds of novel miniaturized dual-band antennas are proposed, which is worked as Radio Frequency Identification (RFID). Their arms carried by bending or simply fractal like tree form based on conventional dipole antenna So they can realize electric small size and dual band with its bent arms. This paper gives design of unequal length arm rounded U-shaped antenna and round notched antenna Experiment...
This Design of a novel printed slots round dualband antenna working at 11.7GHz and 12.1GHz is proposed in this paper. By modulating the radial separation between the printed slots and its width properly, we can get the antenna work at different frequency and have different direction of farfield pattern, that is to say direction of diversity. This antenna can be used in wireless bridge to connect two...
In this paper, a prototype slot array antenna for dual polarized monopulse operation is proposed. The suggested monopulse antenna structure is composed of a dual polarized radiating part using substrate integrated waveguide (SIW) technology and a feed network using metallic rectangular waveguides for dual plane tracking. Radiation patterns of the fabricated prototype antenna are measured at elevation...
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