scholarly journals A Dual-Band Circularly Polarized Patch Array Antenna for Phase-Only Beam Shaping with Element Rotation

Electronics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 643
Author(s):  
Edoardo Pelliccia ◽  
Roberto Vincenti Gatti ◽  
Piero Angeletti ◽  
Giovanni Toso
Keyword(s):  
Phase Distribution ◽  
Synthesis Method ◽  
Satellite System ◽  
Beam Shaping ◽  
Dual Band ◽  
Circularly Polarized ◽  
Frequency Bands ◽  
Radiating Element ◽  
Effective Phase ◽  
Global Navigation Satellite

In this paper, an innovative patch antenna optimally designed for phase-only beam shaping is presented. The radiating element generates a circularly polarized field and exhibits two separate operative frequency bands. The element is center-fed by a pin connected to the beam forming network (BFN) layer. This unique feature allows us to generate any given phase distribution by simply proportionally rotating the radiating elements with respect to their feeding points. An effective phase-only synthesis method is also illustrated, which takes into account the radiating element rotations. To demonstrate the effectiveness of the proposed solution, two linear arrays for global coverage have been designed, specifically operating in the E1 and E6 frequency bands of the European Global Navigation Satellite System (GNSS) Galileo. The two presented antennas performance have been verified with full-wave simulations, showing excellent agreement with theoretical results and, therefore, confirming the effectiveness of the presented design approach.

scholarly journals A Compact Dual-Band Circularly Polarized Antenna with Wide HPBWs for CNSS Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Chao Li ◽  
Fu-Shun Zhang ◽  
Fan Zhang ◽  
Kaiwen Yang
Keyword(s):  
Free Space ◽  
Axial Ratio ◽  
Satellite System ◽  
Dual Band ◽  
Navigation Satellite ◽  
Circularly Polarized ◽  
Horizontal Portion ◽  
Half Power ◽  
Sequential Phase ◽  
Compass Navigation

A compact dual-band circularly polarized antenna with wide half-power beamwidths (HPBWs) for compass navigation satellite system applications is proposed in this paper. The CP radiation is realized by arranging four compact dual-band inverted-F monopoles symmetrically to the center point, where the four monopoles are excited with a 90° phase offset through a compact sequential-phase feeding network. The compactness of the dual-band inverted-F monopole is realized by inserting two chip inductors in the horizontal portion of the monopole. The overall dimension of the antenna is only 0.211λ0 × 0.211λ0 × 0.057λ0, where λ0 is the corresponding free-space wavelength at 1.268 GHz. Experimental results show that the proposed antenna exhibits two overlapped impedance and axial ratio bandwidths of 50 MHz (1.236–1.286 GHz) and 40 MHz (1.532–1.572 GHz). Wide HPBWs of about 120°/125° and 121°/116° (XOZ/YOZ planes) at center frequencies (1.268, 1.561 GHz) of the CNSS-2 B3 and B1 bands are obtained, respectively. With these good performances, the antenna can be a good candidate for CNSS applications.

Compact Dual-Band Proximity-Fed Circularly Polarized Patch Antenna for BDS Applications

Frequenz ◽  
2015 ◽  
Vol 69 (9-10) ◽  
Author(s):  
Jianxing Li ◽  
Bin He ◽  
Jing Fang ◽  
Anxue Zhang
Keyword(s):  
Patch Antenna ◽  
Branch Length ◽  
Axial Ratio ◽  
Dielectric Substrate ◽  
Satellite System ◽  
Antenna Design ◽  
Dual Band ◽  
Antenna Aperture ◽  
Small Surface ◽  
Circularly Polarized

AbstractThis paper presents a compact dual-band proximity-fed circularly polarized (CP) patch antenna for BeiDou Navigation Satellite System (BDS) operation at B1 (1,561 MHz) and B3 (1,268 MHz) bands. The antenna aperture is minimized down to 26.6 mm (λ/9 at the B3 band) in diameter and 12 mm (λ/20 at the B3 band) in thickness using high permittivity dielectric substrate and meandered slots. The antenna design features that the resonant frequency in the higher band could be tuned independently by adjusting the branch length and breadth without affecting the lower band. To achieve right-handed CP (RHCP) radiation property, quadrature phase feeding is employed together with a broadband 0°–90° hybrid utilizing a small surface mount LTCC hybrid coupler chip. Experimental results show that the RHCP gain maintains larger than 1.5 dBic and the axial ratio (AR) stays below 3 dB within the B1 and B3 bands. This antenna design is a promising candidate for small BDS arrays as well as other dual-band BDS applications.

scholarly journals Circularly Polarized Array with Enhanced Isolation Using Magnetic Metamaterials

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1356 ◽  
Author(s):  
Bo Li ◽  
Chun Yang ◽  
Zhanping Yang ◽  
Junwei Shi ◽  
Jianxing Li ◽  
...  
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Active Element ◽  
Axial Ratio ◽  
Satellite System ◽  
Ring Resonators ◽  
Dual Band ◽  
Split Ring ◽  
Circularly Polarized ◽  
Beidou Navigation Satellite System

This article proposes a 2 × 2 circularly polarized array with enhanced isolation that could be used in the adaptive anti-jamming system for China’s Beidou Navigation Satellite System (BDS), and a compact dual-band microstrip antenna for GPS and GLONASS is designed at the center part of the array for multiple modes operation. The substrate integrated split ring resonators with negative effective permeability are used as the magnetic metamaterials. Four groups of the magnetic metamaterials are placed between the BDS antenna elements, which could constrain the EM filed in the area of the active element, and then significantly reduce the mutual coupling among the elements. The results tell that the isolation among the BDS elements are improved by more than 10 dB, and the performance of radiation patterns and the axial ratio of each BDS elements are also apparently improved compared to the array without magnetic metamaterials.

scholarly journals A Novel Ancient Coin-Like Fractal Multiband Antenna for Wireless Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Zhen Yu ◽  
Jianguo Yu ◽  
Xiaoying Ran ◽  
Chenhua Zhu
Keyword(s):  
Satellite System ◽  
Structural Features ◽  
Microstrip Antennas ◽  
Fourth Generation ◽  
Navigation Satellite ◽  
Frequency Bands ◽  
Satellite Navigation System ◽  
Wireless Applications ◽  
Measurement Results ◽  
Global Navigation Satellite

This study proposes a novel square-circle structure fractal multibroadband planar antenna, similar to an ancient Chinese coin-like structure, for second generation (2G), third generation (3G), fourth generation (4G), WLAN, and navigation wireless applications. The device is based on the principles and structural features of conventional monopole antenna elements, combined with the advantages of microstrip antennas and fractal geometry. A fractal method was presented for circular nested square slotted structures, similar to an ancient Chinese copper coin. The proposed antenna adapted five iterations on a fractal structure radiator, which covers more than ten mobile applications in three broad frequency bands with a bandwidth of 70% (1.43–2.97 GHz) for DCS1800, TD-SCDMA, WCDMA, CDMA2000, LTE33-41, Bluetooth, GPS (Global Positioning System), BDS (BeiDou Navigation Satellite System), GLONSS (Global Navigation Satellite System), GALILEO (Galileo Satellite Navigation System), and WLAN frequency bands, 16.32% (3.32–3.91 GHz) for LTE42, LTE43, and WiMAX frequency bands, and 10.92% (4.85–5.41 GHz) for WLAN frequency band. The proposed antenna was fabricated on a 1.6 mm thick G10/FR4 substrate with a dielectric constant of 4.4 and a size of 88.5 × 60 mm2. The measurement results reveal that the omnidirectional radiation patterns achieve a gain of 1.16–3.75 dBi and an efficiency of 40–72%. The good agreement between the measurement results and simulation validates the proposed design approach and satisfies the requirements for various wireless applications.

scholarly journals Satellite Cross-Talk Impact Analysis in Airborne Interferometric Global Navigation Satellite System-Reflectometry with the Microwave Interferometric Reflectometer

2019 ◽  
Vol 11 (9) ◽  
pp. 1120 ◽  
Author(s):  
Raul Onrubia ◽  
Daniel Pascual ◽  
Hyuk Park ◽  
Adriano Camps ◽  
Christoph Rüdiger ◽  
...  
Keyword(s):  
Frequency Band ◽  
Global Navigation Satellite System ◽  
Cross Talk ◽  
Impact Analysis ◽  
Satellite System ◽  
Dual Band ◽  
Navigation Satellite ◽  
South Wales ◽  
Global Navigation ◽  
Global Navigation Satellite

This work analyzes the satellite cross-talk observed by the microwave interferometric reflectometer (MIR), a new global navigation satellite system (GNSS) reflectometer, during an airborne field campaign in Victoria and New South Wales, Australia. MIR is a GNSS reflectometer with two 19-element, dual-band arrays, each of them having four steerable beams. The data collected during the experiment, the characterization of the arrays, and the global positioning system (GPS) and Galileo ephemeris were used to compute the expected delays and power levels of all incoming signals, and the probability of cross-talk was then evaluated. Despite the MIR highly directive arrays, the largest ever for a GNSS-R instrument, one of the flights was found to be contaminated by cross-talk almost half of the time at the L1/E1 frequency band, and all four flights were contaminated ∼5–10% of the time at the L5/E5a frequency band. The cross-talk introduces an error of up to 40 cm of standard deviation for altimetric applications and about 0.24 dB for scatterometric applications.

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