High isolation dual circularly polarized antenna in gap waveguide technology for mm-Wave satellite communications

doi:10.23919/JSEE.2025.000031

Abstract

Abstract:

A millimeter-wave (mm-Wave) dual circularly polarized (CP) antenna in gap waveguide (GWG) technology with high port isolation is proposed in this paper. It is consisted of a simplified orthomode transducer (OMT) and an improved multi-section hexagonal waveguide CP horn antenna. The OMT is composed of two metal layers without the traditional septum or iris, which makes the structure simpler. The CP horn antenna can be easily integrated with the OMT without mode conversion. The principle analysis as well as the simulated and measured results of the proposed antenna are given in this paper. The simulated and measured results agree very well with each other. The port isolation of more than 27 dB over bandwidth of 26.5?31 GHz (|S₁₁|< ?15 dB) is achieved with relative bandwidth of 15.7%. The axial ratio (AR) lower than 2.5 dB for both left-hand and right-hand CP (LHCP and RHCP) are achieved over the bandwidth. The proposed antenna is a candidate for mm-Wave satellite communications or beyond fifth-generation (5G) communications applications.

Key words: dual circularly polarized antennas, gap waveguide, orthomode transducer, millimeter wave

Shuanglong QUAN, Jianyin CAO, Chao HE, Hao WANG. High isolation dual circularly polarized antenna in gap waveguide technology for mm-Wave satellite communications[J]. Journal of Systems Engineering and Electronics, 2026, 37(3): 836-843.

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Parameter	wg_a	wg_b	w₁	w₂	d₁	dp₁	dp₂	dp₃	h₁	h₂	h₃	h₄	h₅
Value	7.112	3.556	2.55	2.40	11.50	3.08	3.28	3.04	3.556	3.756	4.756	6.056	7.112

Parameter	h₆	h₇	h₈	h₉	l₁	l₂	l₃	l₄	l₅	l₆	l₇	l₈	l₉
Value	3.75	8.362	9.612	10.862	5.0	4.0	4.0	3.8	8.2	3.0	5.0	10.0	24.0

Method	Frequency/GHz	Reflection coefficient /dB	AR/dB	Isolation/dB	Overall bandwidth/%	Gain fluctuation/dB	Antenna length ($ {\lambda _0} $)	Complexity	Technology
Method in [24]	17.6−19.8	< −13	< 3	$\geqslant $15	11.8	2.2	5.3	Simple	SIW
Method in [26]	28.5−31.2	< −25	−	> 27	9.0	−	12.5	Simple	CW
Method in [28]	54−60	< −10	< 2.2	> 15	10.5	−	≈ 8.1	Complex	CW
Method in [29]	50−75	< −13.8	< 3	> 22	37.4	6	≈ 8.8	Complex	RW
Method in [30]	80−110	< −20	< 2.8	> 32.5	31.6	4	21.6	Complex	CW
Proposed method	26.5−31	< −15	< 2.5	> 27	15.7	1.1	6.4	Simple	GWG

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