# Research Article A New Kind of Circular Polarization Leaky-Wave Antenna Based on Substrate Integrated Waveguide

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3 Antennas and Propagation Amplitude of E (V) 1 1 Amplitude of E (V) 1 1 E x E y (a) 1 1 E x E y (b) Figure : Amplitudes of the two electrical field components radiated by the SIW leaky-wave antenna for different lengths of N-shaped slots, f=ghz, L=mm, (a) W=mm, and (b) W =. mm. 3.. Effect of Structure Parameters on Axial Ratio. Since the period of slots is set to P=1mm, the range of slot lengths should be limited to mm and 7 mm. In order to decrease the intersection between adjacent slots, the length of slot is fixed to L=mm in this paper. Considering the conditions for generating circular polarization wave, the range of slot widths is set to mm and mm. Figure 3 illustrates the effect of width W of N-shaped slots on the axial ratio, while W 1 = 3. mm and L 1 = mm, from which we can see that the axial ratio is influenced significantly by the width W. In order to find the reason behind this phenomenon, the amplitudes of the two components E x and E y of far field for two cases of W =. mm and W=mm are given in Figure.ItcanbefoundthatwhenW =. mm, the amplitude of E x almost equals that of E y,butforw=mm E x is much smaller than E y. In addition, the increasing of width of N-shaped slots will cut more J y current filaments; therefore, E y will increase and ratio of E x /E y will decrease; this results in a significant change in the axial ratio. While the width of N-shaped slots is fixed to W =. mm, the axial ratio as function of length L 1 is given in Figure ; thelengthofl is fixed to mm. Because the width w of two vertical slots is set to. mm in this paper, the N-shaped slot structure keeps unchanging when horizontal length of inclined slots L 1 increases from mm to mm; this corresponds to the straight segment in the bottom of the curve. From Figure,itcanbefoundthatwhenthelengthL of the slots is larger than that of the inclined slot L 1, the axial ratio increases sharply. On the other hand, the axial ratio of the antenna increases gently, when the length of inclined slot L 1 is larger than L. Figure illustrates the electric field distributions of the N-shaped slot for parameters of L 1 =3mm (L 1 +w <L) and L 1 =mm (L 1 +w =L), respectively, from which we find that the field component E y for L 1 =3mm is much AR (db) L 1 (mm) Figure : Axial ratio of the SIW leaky-wave antenna as function of length L 1 of the N-shaped slot for f = GHz, L = mm, W =. mm, and W 1 = 3. mm. larger than that of L 1 =mm. The reason is that more current filaments are cut by the left and right edges of the two vertical slots and inclined slot when L 1 =3mm (L 1 +w <L), as canbeseeninfigure. Figure 7 shows the axial ratios of the antenna in main beam direction for different widths W 1 of inclined slot. It can be found that changing of width W 1 has little impact on the axial ratio Antenna with Optimum Circular Polarization Property. According to the above analysis, properly selecting parameters of N-shaped slots can give minimum axial ratio in main beam direction of the antenna for a specific frequency band. From our work, it is found that when the parameters

4 Antennas and Propagation (a) L 1 =3mm (b) L 1 =mm Figure : Magnitude distribution of E y in the N-shaped slot. 1 AR (db) 3 S-parameters (db) W 1 (mm) Figure 7: Axial ratio of the SIW leaky-wave antenna as function of width W of the N-shaped slot for f=ghz, L 1 =mm, L=mm, and W =. mm S 11 measured S 11 simulated Frequency (GHz) S 1 measured S 1 simulated Figure 9: Measured and simulated S-parameters of the antenna shown in Figure. Figure : Photograph of the SIW with N-shaped slots. of N-shaped slots are selected to be W =. mm, W 1 = 3. mm, L=mm, and L 1 =mm, the axial ratio reaches its minimum value of.3 at GHz. The photograph of the fabricated antenna corresponding to these parameters is shown in Figure.ThemeasuredandsimulatedS-parameters of the antennas are illustrated in Figure 9. Itcanbefound that the simulated and experimented return losses of the antenna are lower than 1 db from 7. GHz to. GHz. The differences between simulated and measured results are probably due to the errors of fabrication and measurement. Meanwhile, the measured S 1 is a little bit smaller than the simulated one, because the loss of feeders and dielectric substrate are not considered during the simulation. The axial ratios of antennas for different widths in main beam direction as functions of frequency are given in Figure 1. It can be found that, for W=.mm, the simulated axial ratio is less than 3 db in the band from 7. GHz to.ghz,andthemeasuredaxialratioislessthandbin this band. When the slot width is increased to mm, the axial ratio of the corresponding antenna is larger than that of the antenna with W =. mm; this phenomenon can be explained by Figure. The comparisons of axial ratios of the antenna with N-shaped slots and the antenna with H- shaped slot given in [9], in band from 7. GHz to. GHz, are also given in Figure 1.Itcanbefoundthattheaxialratio of antenna with N-shaped slot is lower than that of antenna with H-shaped slot at specific frequency band. Figure11 gives the simulated and measured radiation patterns at GHz, when the antenna is fed from left side. It can be found that the antenna generates right-hand circular polarization wave; the simulated gain is.93 dbi, and the gain

5 Antennas and Propagation Axial ratio (db) 1 1 Radiation pattern (db) Frequency (GHz) W=.mm simulated H-shaped slot [9] W=.mm measured W=mm simulated Gain total Gain LHCP Gain RHCP Figure 1: Comparisons of axial ratios of the antennas with N- shaped slots and the antenna with H-shaped slot given in [9]. Figure 1: Radiation patterns of the SIW leaky-wave antennas fed from right side. Radiation pattern (db) Gain total Gain LHCP Gain RHCP H-shaped Measured results Figure 11: Radiation patterns of the SIW leaky-wave antennas fed from left side. for the left-hand circular polarization wave (cross polarization) of this antenna is 1.3 dbi, which is about 1.3 dbi lower than that of RHCP; measured gain is lower than the simulated result. The gain of the antenna in [9] for H-shaped slots is also given in Figure 11, which is. dbi lower than that of the antenna with N-shaped slots. It is found from analysis that when the antenna is fed from the right side, the left-hand circular polarization (LHCP) radiation will be generated, as shown in Figure 1. Thegain for the LHCP wave is 1. dbi higher than that of RHCP wave.theaxialratiooftheantennafedfromrightsideisgiven in Figure 13. It can be found that the range for axial ratio less than 3 db is. and 3.. Axial ratio (db) Figure 13: Axial ratio of the antenna fed from right side.. Conclusion In this paper, a novel kind of circular polarization leaky-wave antenna with N-shaped slots based on substrate integrated waveguide is proposed, and the axial ratios for different parameters and frequencies are given and discussed. From the simulated and measured results, it is found that this SIW based leaky-wave antenna can realize circular polarization radiation in the GHz satellite band, and it maintains the desirable properties of low profile and light weight and is easy to integrate with planar circuits. Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper.

6 Antennas and Propagation Acknowledgments This work was supported in part by the National Nature Science Foundation of China under Grant 1331 and in part by the National Program on Key Basic Research Project under Grant no. 13CB393. References [1] G. Q. Luo, P. Li, Z. C. Zheng, and L. L. Sun, A dual circularly polarized antenna with improved axial ratio bandwidth, in Proceedings of the China-Japan Joint Microwave Conference (CJMW 11), pp , April 11. [] G. Mazzarella, Q. Mootisci, and M. Musa, A polarization-agile waveguide slot antenna, in Proceedings of the IEEE Antennas and Propagation Society International Symposium, vol.3,pp , June 3. [3] D. Deslandes and K. Wu, Integrated microstrip and rectangular waveguide in planar form, IEEE Microwave and Wireless Components Letters, vol. 11, no., pp. 7, 1. [] K. Wu and F. Boone, Guided-wave properties of synthesized nonradiative dielectric waveguide for substrate integrated circuits (SICs), in Proceedings of the IEEE MTT-S International Microwave Symposium Digest,vol.,pp.73 7,1. [] T. Yang, P. L. Chi, and R. M. Xu, Novel composite right/lefthanded leaky-wave antennas based on the folded substrate integrated waveguide structures, Progress In Electromagnetics Research C,vol.9,pp.3,1. []L.Yan,W.Hong,G.Hua,J.Chen,K.Wu,andT.J.Cui, Simulation and experiment on SIW slot array antennas, IEEE Microwave and Wireless Components Letters, vol.1,no.9,pp.,. [7] W. Hong, Development of microwave antennas, components andsubystemsbasedonsiwtechnology, inproceedings of the IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE ),pp.1 17,August. [] J.Liu,D.R.Jackson,andY.Long, Substrateintegratedwaveguide (SIW) leaky-wave antenna with transverse slots, IEEE Transactions on Antennas and Propagation,vol.,no.1,pp. 9, 1. [9] Y. J. Li and K.-M. Luk, Low-cost high-gain and broadband substrate-integrated-waveguide-fed patch antenna array for - GHz band, IEEE Transactions on Antennas and Propagation, vol., no. 11, pp. 31 3, 1. [1] J. H. Liu, X. H. Tang, Y. X. Li, and Y. L. Long, Substrate integrated waveguide leaky-wave antenna with H-shaped slots, IEEE Transactions on Antennas and Propagation,vol.,no., pp , 1.

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