Design of Offset Dual-Reflector Antennas for Improving Isolation Level Between Transmitter and Receiver Antennas

Kong, Ki-Bok; Kim, Hee-Su; Aziz, Rao Shahid; Park, Seong‐Ook

doi:10.2528/pierc15041301

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…To minimize the side lobe levels and cross polarization, we also apply Mizugutchi condition to optimize the design of our offset antennas. The condition to cancel cross polarization in offset designs can be determined by equation [22] as follows where M is the magnification ratio, e the eccentricity of the subreflector as depicted in Fig. 1 (a) and (b), β is the angle between the axis of the primary reflector and that of the subreflector.…”

Section: Methodsmentioning

confidence: 99%

Analysis of Offset Antennas in Radio Telescopes

Yeap

Yiam

Lai

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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We present an analysis on the performance of two popular dual offset antennas design, i.e. the offset Cassegrain and Gregorian reflector antennas. In our study, we have adopted the design parameters for the Cassegrain configuration used in the Atacama Large Milimeter Array (ALMA) project. Modifications on the original parameters are made so as to meet the design requirement of the offset configurations. To reduce spillover loss, we have adjusted the angle between the axis of the primary reflector and that of the sub-reflector to 0.20 o. The results obtained from the physical optics computation show that the amplitude at the main lobe of the Gregorian configuration is approximately 74.02 dB, while that of the Cassegrain configuration is approximately 74 dB. The maximum (relative) side lobe level, SLL dB for the Cassegrain and Gregorian configurations are found as-3.67 dB and-3.69 dB respectively. Although the magnitude of the main lobe for both configurations is comparable, the Gregorian antenna gives relatively lower SLL dB. In other words, the Gregorian configuration performs relatively better than its Cassegrainian counterpart.

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Section: Methodsmentioning

confidence: 99%

Analysis of Offset Antennas in Radio Telescopes

Yeap

Yiam

Lai

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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“…Thirdly, it is conducive for improving the isolation between port 1 and port 2 [19]. Even orthomode transducer (OMT) is widely used in the design of dual-polarization antennas, the traditional OTM methods is hard have an ideal performance in bandwidth, isolation, same beam-form and simple structure [16], [17], [20]. The simple feed method, in out design, is suitable for the design of large aperture, small the feeding position of port 2 is exactly at the position where the current of port 1 is low, which can improve the isolation between two ports and reduce the influence on the current distribution of port 1.…”

Section: B Design Of the Antenna Feed Systemmentioning

confidence: 99%

Design of 94GHz Dual-Polarization Antenna Fed by Diagonal Horn for Cloud Radars

et al. 2022

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In this paper, a 94 GHz dual-polarization high-isolation cassegrain antenna feed by a diagonal horn antenna is designed. The antenna consists of a D = 540 mm main reflector, sub-reflector, and dual-port dual-polarization diagonal horn feed antenna. To obtain similar feed horn E-H radiation patterns, gain, high polarization, and port isolation, a dual-port diagonal horn was designed in the feed. The measured antenna gains are 50.85 dBi and the side-lobe levels are -24.5 dB at E-H radiation patterns of two ports at 94 GHz, respectively. The VSWRs of port 1 and port 2 are less than 1.5:1 in the range 93.2-95.3 GHz, witch meets the working requirements of frequency modulated continuous wave and pulse cloud radars. And the isolation between the two ports is above -50 dB, whereas the polarization isolation of each port is above 40 dB. The proposed W-band antenna is a suitable candidate for the dual-polarization cloud radars.INDEX TERMS Cassegrain antenna, diagonal horn antenna, dual-polarization, high isolation, similar beam.

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“…This guaranteed increasing the pulse width and consequently increasing the average power of the received signal, hence overcoming the dead zone problem which arises if a single antenna is used. Additionally, the usage of two antennas is better than using a circulator because the circulator attenuates the received signal [ 58 ] and improves the isolation level between TX and RX [ 59 ]. As shown in Figure 22 a, two grid parabolic antennas, model TL-ANT2424B, operated at

GHz central frequency, with gain 24 dBi, were used.…”

Section: Practical Proof Using Sdrmentioning

confidence: 99%

Design and Implementation of an Enhanced Matched Filter for Sidelobe Reduction of Pulsed Linear Frequency Modulation Radar

Azouz

Abosekeen

Nassar

et al. 2021

Sensors

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Pulse compression techniques are commonly used in linear frequency modulated (LFM) waveforms to improve the signal-to-noise ratios (SNRs) and range resolutions of pulsed radars, whose detection capabilities are affected by the sidelobes. In this study, a sidelobe reduction filter (SRF) was designed and implemented using software defined radio (SDR). An enhanced matched filter (EMF) that combines a matched filter (MF) and an SRF is proposed and was implemented. In contrast to the current commonly used approaches, the mathematical model of the SRF frequency response is extracted without depending on any iteration methods or adaptive techniques, which results in increased efficiency and computational speed for the developed model. The performance of the proposed EMF was verified through the measurement of four metrics, including the peak sidelobe ratio (PSLR), the impulse response width (IRW), the mainlobe loss ratio (MLR), and the receiver operational characteristics (ROCs) at different SNRs. The ambiguity function was then used to characterize the Doppler effect on the designed EMF. In addition, the detection of single and multiple targets using the proposed EMF was performed, and the results showed that it overcame the masking problem due to its effective reduction of the sidelobes. Hence, the practical application of the EMF matches the performance analysis. Moreover, when implementing the EMF proposed in this paper, it outperformed the common MF, especially when detecting targets moving at low speeds and having small radar cross-sections (RCS), even under severe masking conditions.

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Design of Offset Dual-Reflector Antennas for Improving Isolation Level Between Transmitter and Receiver Antennas

Cited by 9 publications

References 12 publications

Analysis of Offset Antennas in Radio Telescopes

Analysis of Offset Antennas in Radio Telescopes

Design of 94GHz Dual-Polarization Antenna Fed by Diagonal Horn for Cloud Radars

Design and Implementation of an Enhanced Matched Filter for Sidelobe Reduction of Pulsed Linear Frequency Modulation Radar

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