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The transient response of the X-band microstrip antenna array illuminated by electromagnetic pulse(EMP) was calculated using FDTD and the proposed conductor edge of singularity solving technology which maintained the high accuracy without lower computation efficiency. The research results showed that the EMP can result in the enough high response voltage in coaxial line which may destroy components...
In this paper, using 100000 CPU cores, the parallel Finite Difference Time Domain (FDTD) algorithm based on MPI is firstly applied to analyze the radiation characteristic of a microstrip antenna array on the National Supercomputing Center in Jinan (NSCC-JN) successfully, which is a domestically-made supercomputer. And the parallel performance of the code is tested on it. The results show that the...
A novel microstrip array antenna is presented. The proposed antenna is based on a standing-wave feed network, in which quarter-wave transformers are not required. A standing wave is formed in the microstrip lines that feed electromagnetic power to radiating elements. Such unique feeding scheme is advantageous compared to a corporate feed because the standing-wave feed can reduce spurious radiation...
In this paper we propose a horizontally polarized antenna with omni-directivity in horizontal plane to use for reference antenna. Ripple coefficients of the radiation pattern in horizontal plane improve to ±0.1 dB. The theory of characteristic modes is used to analyze and illustrate the reason of the excellent omni-directivity property of the proposed antenna.
Feasible EM-driven design of microstrip antenna subarrays through surrogate-based optimization (SBO) is proposed. By exploiting SBO and variable-fidelity EM simulations, our approach allows simultaneous and low-cost optimization of both array and feed parameters for low side lobs and low reflection.
A high gain and wide band stacked antenna array, having a microstrip aperture coupled feeding technique with a mounted Horn integrated on it, is presented. With optimized parameters, the 2×2 antenna array at a center frequency of 60 GHz, exhibits an impedance bandwidth of about 10.58 % (58.9 – 65.25 GHz). With a corporate feed network, the 2×2 array structure resulted a gain of 15.3 dB with an efficiency...
This paper presents design and measurement of a linearly polarized radial line microstrip antenna array (RL-MSAA) with U-slot circular MSAs (C-MSAs). An circular microstrip antenna with U-shaped slot is used as a radiation element of the RL-MSAA. Radiation phase of the U-slot C-MSA is controlled by tuning a radius of the C-MSA and dimensions of the U-slot on the C-MSA; therefore, the desired phase...
A novel tree fractal wide-slot broadband circularly polarized (CP) printed antenna array is proposed. The antenna array is parallel fed by L-shaped metal microstrip, and the element is coupled by a wide-slot. Two perturbation branches are applied to the L-shaped metal microstrip to construct the tree-fractal structure. This antenna is designed by simulations and experiments. And results show that...
Microstrip antenna with frequency and radiation pattern selectivity is presented in this paper. A small patch-slot-ring structure is used as the radiating element. PIN diodes loaded across the slot-ring are employed to switch the pattern in three directions. The three patterns can cover the area from −80° to 60°. Moreover, one of the three situations operates at 2.84 GHz, and the others operate at...
We describe a microstrip-fed stacked patch antenna suitable for generating radiation in the end-fire direction parallel to the plane of the transceiver substrate. The antenna exploits the flexible nature of a Liquid Crystal Polymer (LCP) substrate, which is folded at an angle of 90° to meet the radiation requirement. Performance of a linearly polarized single stacked patch antenna and an eight-element...
It is aimed to design a X-band monopulse microstrip antenna array that can be used almost in all modern tracking radars and having superior properties in angle detection and angular accuracy than the classical ones. In order to create a monopulse antenna array, a rectangular microstrip antenna is designed and 16 of it gathered together using the nonlinear central feeding to suppress the side lobe...
A differential microstrip antenna is designed and fabricated for spatial power combining at 45 GHz. A 2×16 antenna array is implemented on a PCB which has been integrated with Si transmitter chips. The simulation results for the reference design and process variations have been presented.
A liquid crystal (LC) based microstrip patch antenna array with frequency tuning capabilities operating in the X-band is presented. Frequency tunable capabilities of the presented antenna array are shown to come from the dielectric anisotropy of liquid crystals at microwave frequencies. This array is fed by a single microstrip line, with individual control of each array element. The design thus offers...
A new type of dual-polarization and dual-frequency multilayer-stacked microstrip array antenna is introduced. The feeding mechanism of the element is the aperture coupling for one polarization and the direct feeding for the orthogonal polarization. The microstrip element exhibits a wideband of operation. A slot etched on driven patch is used to improve isolation performance of the proposed antenna...
A Ku-band cylindrical conformal waveguide slot array antenna is presented. The phase differences between slots on the cylindrical surface are compensated by adjusting the position of radiation slots. As a result of adjusting the position of radiate-slot, the periodicity of high side-lobe is analyzed.
A 2-D slot array structure to achieve near-field beam focusing, with a linear polarization, is proposed and demonstrated using full-wave simulations. The proposed structure has a negligible cross-polarization and its far-field gain is lower by 10 dB compared to the non-focus case, indicating a good focusing in the near-field of the structure.
In this paper, a 2×2 planar array antenna employing circular microstrip patches capable of simultaneous frequency tunability and polarization reconfiguration is investigated. Using varactors diodes, the antenna frequency can be tuned between 1.57 GHz and 1.18 GHz (29% tunability), which covers the full L-band communication. By suitably exciting the two feed ports for each array element, the polarization...
This paper presents the design of a dual-frequency filtenna using a defected ground structure (DGS). A shared aperture coupled microstrip antenna operating at 20/30 GHz (Ka band) is integrated with a coupled-line bandpass filter to increase the isolation between the transmit and receive channels. It is shown that the presence of slots in the ground plane can significantly increase the coupling between...
Impact of the cross-polarization of a large circularly polarized (CP) square scanning array arising from the cross polarization performance of a CP microstrip antenna element is investigated. Techniques and limitations of rotational layout and sequential phase feeds for cross-polarization reductions are presented for uniformly aligned and staggered square arrays.
To meet the high gain requirement, a 2×2 a microstrip patch antenna array is designed and used as a feed source to illuminate a symmetric parabolic reflector antenna at 300 GHz. The effect of the substrate and conductor material properties on the performance of the microstrip array antenna is discussed. Resulting reflector antenna performance is discussed using this feed. Another application of this...
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