Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Eldesouki, Eman M.; Hussein, Khalid Fawzy Ahmed; El-Nadi, and Adel M.

doi:10.2528/pierb08080302

Cited by 13 publications

(9 citation statements)

References 20 publications

(22 reference statements)

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“…From Figure 12, it can be noted that the measured gain of both antennas are above 4 dB in the CP range of operation. Boresight axial ratio was computed from the S 21 data of LHCP and RHCP prototypes using (2) [17]. Comparisons of all results (simulated and measured) are listed in Table 6.…”

Section: Resultsmentioning

confidence: 99%

A Broadband Suspended Microstrip Antenna for Circular Polarization

Kasabegoudar¹,

Vinoy²

2009

PIER

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Abstract-In this paper we propose a circularly polarized (CP) microstrip antenna on a suspended substrate with a coplanar capacitive feed and a slot within the rectangular patch. The antenna has an axial ratio bandwidth (< 3 dB) of 7.1%. The proposed antenna exhibits a much higher impedance bandwidth of about 49% (S 11 < −10 dB) and also yields return loss better than −15 dB in the useful range of circular polarization. Measured characteristics of the antenna are in good agreement with the simulated results. The radiation patterns indicate good cross polarization rejection and low back lobe radiations. The design proposed here can be scaled to any frequency of interest.

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Section: Resultsmentioning

confidence: 99%

A Broadband Suspended Microstrip Antenna for Circular Polarization

Kasabegoudar¹,

Vinoy²

2009

PIER

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“…Microwave fields in three-dimensional [1,2], two-dimensional (printed patches or etched slots), and quasi-one dimensional cavities (printed transmission lines) [3,4] are known to exhibit very sharp peaks over very narrow frequency intervals leading to very high Q-factor resonators. Such resonators can be used to design high Q-factor bandpass and bandstop filters.…”

Section: Introductionmentioning

confidence: 99%

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

Fahmy¹,

Farahat²,

Hussein³

et al. 2020

PIER B

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High Q-factor bandstop filter based on broadside-coupling between U-shaped coplanar waveguide (CPW) resonator and CPW through-line (CPWTL) is proposed in the present paper. The CPWTL is printed on the top layer of the dielectric substrate whereas the CPW resonator (CPWR) is printed on the bottom layer. Only over very narrow frequency band around the resonant frequency of the CPWR the microwave power flowing in the CPWTL is coupled to (absorbed by) the CPWR leading to a bandstop filter of very high Q-factor. A CPWR with side ground strips of finite width is shown to have much higher Q-factor than that of infinitely extending side ground planes. Owing to the lower profile of the CPW with finite-width, the radiation loss is reduced, and the structure has narrower frequency band for coupling, which results in much higher Q-factor than other published works. The dimensions of the CPWTL are optimized for impedance matching whereas the dimensions of the Ushaped CPWR are optimized to obtain the highest possible Q-factor. The effect of the loss tangent of the dielectric substrate material on the Q-factor is investigated. A prototype of the proposed filter is fabricated and experimentally studied for more understanding of the underlying physical principles of operation and for experimental investigation of the filter performance. The experimental measurements show good agreement with the corresponding simulation results.

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“…The other is that the phase difference of two orthogonal modes is 90 degrees. The often utilized technique to generate CP wave in the microstrip antenna is feeding asymmetrically in the microstrip patch to generate two degenerated modes and to complete impedance matching [11][12][13][14][15][16][17][18][19][20]. However, it is impossible to generate a circularly polarized wave in a single dipole antenna because only z-directed current distribution exists on the thin cylindrical conductor.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Wide-Strip Dipole Antenna for Circularly Polarized Wave Operations

Chi¹,

Bor²,

Deng³

et al. 2010

PIER

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Abstract-A thin dipole antenna is a well-known antenna with linearly polarized wave operation. In this work, a wide-strip dipole antenna is proposed for circularly polarized wave operations. To obtain circularly polarized (CP) wave operations, there are two conditions to be satisfied. One is that the antenna must have two degenerated orthogonal modes with different resonant frequencies. The other is that the phase difference of two orthogonal modes is 90 degrees. To match the first condition, the slab width W is tuned to generate current distributions directed in two different directions. In addition, the second condition is matched by asymmetric feeding point by adjusting the overlapped square width C. The parametric study is completed by the Ansoft HFSS simulator. Simulated results reveal that the CP wave is mainly influenced by the slab width W . The influences of the parameters C and d on the performances of the proposed antenna are also investigated in this paper. Taking −8 dB as reference, there are two working bands for this proposed antenna and the measured center frequencies are 0.66 GHz and 2.04 GHz, respectively, and the corresponding bandwidths are 0.27 GHz (40%) and 1.78 GHz (87%), respectively. In addition, the measured center frequencies and bandwidths of the axial ratio are 1.94 GHz and 0.53 GHz (27%), respectively.Corresponding author: L.-P. Chi (cp531220@ms23.hinet.net). 70Chi et al.

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Circularly Polarized Arrays of Cavity Backed Slot Antennas for X-Band Satellite Communications

Cited by 13 publications

References 20 publications

A Broadband Suspended Microstrip Antenna for Circular Polarization

A Broadband Suspended Microstrip Antenna for Circular Polarization

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

A Wideband Wide-Strip Dipole Antenna for Circularly Polarized Wave Operations

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