1. [1] A. P. Saghati, et al.: “A HMSIW circularly polarized leaky-wave antenna with backward, broadside, and forward radiation,” IEEE Antennas Wireless Propag. Lett. 13 (2014) 451 (DOI: 10.1109/LAWP.2014.2309557).
2. [2] W. D’Orazio and K. Wu: “Substrate-integrated-waveguide circulators suitable for millimeter-wave integration,” IEEE Trans. Microw. Theory Techn. 54 (2006) 3675 (DOI: 10.1109/TMTT.2006.882897).
3. [3] R.-S. Li, et al.: “A tunable bandpass-to-bandstop filter using stub-loaded resonators and PIN diode,” IEEE International Conference of Global Symposium on Millimeter-Wave (2017) 21 (DOI: 10.1109/gsmm.2017.7970321).
4. [4] R.-S. Li and F.-C. Chen: “A tunable bandpass-to-bandstop filter using PIN diode,” IEEE International Conference on Ubiquitous Wireless Broadband (2016) 1 (DOI: 10.1109/icuwb.2016.7790555).
5. [5] S. Sirci, et al.: “Analog tuning of compact varactor-loaded combline filters in substrate integrated waveguide,” Microwave Conference (EuMC) (2012) 257 (DOI: 10.23919/EuMC.2012.6459133).