IEEE Antennas and Wireless Propagation Letters

  • A. M. Sonagara, M. Mishra, R. S. Kshetrimayum, E. Björnson, Z. N. Chen, "Ultra-Thin Flexible Uniplanar Antenna Based on SSPP for B5G Radio Stripe Network”," accepted for publication in IEEE Antennas and Wireless Propagation Letters.
    • Abstract: In this letter, a flexible and ultra-thin uniplanar endfire antenna employing spoof surface plasmon polariton (SSPP) is proposed. The single-metal layered groundless structure is an inherent advantage of the SSPP. At the SSPP transmission line’s end, a metallic strip is added asymmetrically for wideband radiation, resulting in an observed tilting of the main lobe in the azimuthal plane. Three C-shaped directors are used to enhance the directivity. The proposed antenna is fabricated and measured over flat and curved surfaces of brick wall and wood with two different radii. The proposed antenna has a low profile of 0.0017λ0 and a small volume of 0.0058λ03, where λ0 is the free-space wavelength at the center frequency of the operating bandwidth. The antenna has an impedance bandwidth of 33.7% with a peak gain of 8.5 dBi. Measurements indicate no significant degradation in the proposed antenna’s performance in different scenarios. Due to features like flexibility, ultrathin profile, very low volume, tilted beam with high gain, and wideband operation, the proposed antenna is highly suitable for beyond fifth-generation (B5G) radio stripe applications.

  • M. Mishra, S. Chaudhuri, R. S. Kshetrimayum, M. S. Sharawi and A. A. Kishk, "A Highly Efficient & Low-Mutual Coupling Partial Π/8 SIW Cavity Based 8-Port MIMO Antenna”," accepted for publication in IEEE Antennas and Wireless Propagation Letters.

    Abstract: A sector-shaped compact π/8 partial substrate-integrated waveguide cavity antenna from the TM220 diagonal mode of the SIW cavity is presented. A 61% size miniaturization is achieved compared to the SIW rectangular cavity in its complete mode configuration. The compact cavity radiator is used as an element of a compact 8-port multiple-input multiple-output (MIMO) antenna. The 8-port MIMO antenna occupies the entire full cavity with slots loaded on the top and bottom layers. The fabricated prototype has a -10 dB impedance bandwidth (BW) from 6.006-6.143 GHz. The mutual coupling within the BW is less than -21 dB. The presented MIMO antenna has an envelope correlation coefficient (ECC) less than 0.0027, and a percentage diversity gain reduction below 1.73%, which makes it a suitable candidate for use in MIMO-based wireless communications


  • R. S. Kshetrimayum, M. Mishra, S. Aïssa, S. K. Koul, and M. S. Sharawi, "Diversity Order and Measure of MIMO Antennas in Single-User, Multi-User and Massive MIMO Wireless Communications," accepted for publication in IEEE Antennas and Wireless Propagation Letters

    Abstract: In this paper, the diversity order (DO) and the diversity measure (DM) of multiple-input multiple-output (MIMO) antennas in generic single-user, multi-user and massive MIMO wireless communications are calculated for several practical case studies. These performance metrics are calculated from the antenna correlation coefficient (ACC) matrix. The DO is calculated from the rank of the ACC matrix, and the DM is obtained from the trace and Frobenius norm of the ACC matrix. Numerical results are provided. In particular, it is shown that though the DM is always less than the DO, it incorporates the effect of antenna correlation on the diversity gain in a better way.

    Source codes:

  • In the capsule titled ‘Diversity Order and Measure of MIMO Antennas in MIMO Wireless (Measured Data)’ (https://codeocean.com/capsule/4581198/tree/v1), there are three MATLAB codes titled ‘DM_DO_PDGR_unform_distribution_measured_5760MHz.m’, ‘DM_DO_PDGR_unform_distribution_measured_5800MHz.m’ and ‘DM_DO_PDGR_unform_distribution_measured_5884MHz.m’ which calculate the diversity measure (DM), the diversity order (DO) and the percentage diversity gain reduction (PDGR) from the measured data of antenna 3 [23] at the 5.76GHz, 5.8GHz and 5.884 GHz respectively.
  • In the capsule titled ‘Diversity Order and Measure of MIMO Antennas in MIMO Wireless for Gaussian and Uniform Distributed Incoming Waves (Simulated Data)’ (https://codeocean.com/capsule/7554244/tree/v1), there are four folders named ‘2300MHz’, ‘2400MHz’, ‘2500MHz’ and ‘2600MHz’. Each subfolder contains two MATLAB codes and accompanying HFSS simulated data of antenna 1 [13]. The MATLAB codes titled ‘DM_DO_PDGR_gaussian_distribution_HFSS.m’, and ‘DM_DO_PDGR_uniform_distribution_HFSS.m’ can be used to calculate the diversity measure (DM), the diversity order (DO) and the percentage diversity gain reduction (PDGR) for Gaussian and uniform distributed incoming waves at the 2.3GHz, 2.4GHz, 2.5GHz and 2.6GHz respectively.


  • S. Chaudhuri, M. Mishra, R. S. Kshetrimayum, R. K. Sonkar, H. Chel, and V. K. Singh, "Rectangular DRA Array for 24 GHz ISM Band Applications," IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 9, Sep. 2020, pp. 1501-1505.
    • Abstract: A planar array antenna consisting of 6 units of rectangular dielectric resonators fed by means of novel microstrip lines through aperture coupling is presented. The structure is designed in such a way that two different modes are excited in the array elements that yield a high bandwidth and gain. Based on the experimental results, the antenna is seen to have an impedance bandwidth of 6.98% centered at 24.09 GHz. Furthermore, the antenna gain is seen to lie between 7 and 9.5 dBi within its entire bandwidth, whereas the cross-polarization discrimination is better than 45 dB in the boresight. These features, along with its low-profile structure, make this antenna a suitable candidate for usage in short-range radars, wireless sensor nodes, and other sensors for the 24 GHz Industrial, Scientific, and Medical (ISM) band.