## 1 Introduction
As for the car, it is linked with the infrastructure of mobile communication, such as a base-station, which is peeped into by the automatic updating of the map in the navigation module. This is made possible by the antenna on the top of the car. A radar used as the sensor is put at the front of the car to play a role in detecting the presence of an object ahead. Different frequencies are allotted to the communication link and sensing link. Similar to that, a satellite uses the aforementioned channels, allowing the platform to connect to the ground station and gather the information on water, fields, forests and mountains transformed from the reflected waves. As with the SAR satellite, RF sensing, though it is utilized for imagery, counts on the communication channel to maintain its quality and to adjust the positioning of the aperture. These applications share basic principles with the scenarios and objectives of the articles examined as flows. [PERSON] et al. add massive MIMO to ISAC and apply compressed sampling to the new approach [PERSON] et al. (2018). Information on the state of the high-dimensional channel comes with a reduced overhead, and the quality of radar imaging improves. Instead of using the MIMO, beamforming can be brought to ISAC, as shown in [PERSON] and [PERSON]'s work [PERSON] [PERSON] (2018); [PERSON] et al. (2018). The former analyzes the function of in-band full-duplexing being combined with hybrid beamforming to detect the direction of the incoming signal. The latter models the system where the downlinks from the tower to multiple vehicles are backed by multiple beams. Similar to [PERSON] et al. (2018), [PERSON] et al. consider the multi-beam in ISAC, but they assume uncorrelated beams and calculate the channel capacity [PERSON] et al. (2018). [PERSON] et al. apply zero-forcing beamforming and power allocation to their analysis on inter-user and inter-ISAC antenna interference [PERSON] et al. (2018). The baseline work is changed to sparse vector coding in [PERSON] et al., but the operation of communications is improved by lowering side-lobes of the beam [PERSON] et al. (2018). ISAC is relatively a young area and is mostly approached and understood with communication theories. Some of the articles on ISAC deal with hardware development and experiments. [PERSON] et al. built a 2.4 GHz radar connected to the same frequency wireless module [PERSON] et al. (2018). An impedance matching circuit for the duplexing function takes the feeding part of a microstrip circular patch, as in [PERSON] et al. (2018). [PERSON] et al. operated a radar at 2.4 GHz as an RF sensor assisting an ISM-band wireless link [11]. Away from the low frequency and using the mmW band, [PERSON] et al. designed a G-band receiver for enormously wide-band-based high data rates [12]. The receiver adopts a waveguide horn antenna. However, inexpensive and mmW solutions are needed. In this paper, an antenna module less costly and more efficient in physical implementation is designed for integrated RF sensing and communication, with both in mmW bands. As illustrated below, the sensing and communication use different frequencies. Figure 2 is the platform where the communication and RF sensing antenna blocks are integrated. The communication should work at 28 GHz, aimed at 5G and satellite-linked 6G. Meanwhile, the RF sensing antenna has to be operated at 24 GHz for use in in radar systems for automobiles and UAMs. The antennas take after the structures presented in [13]. However, differently from them, the antenna for the mmW communication terminal here is combined with the mmW radar antenna by placing feed-lines perpendicular from one bloc to the other in case of proximity interference, in order to check the direct path from the transmitter (TX) to the receiver (RX), which mitigates the pointing error. After assembling the two blocks, experiments are conducted to examine the signal strengths of the sensor and communication links over distances of many wavelengths with LOS and reflecting objects in terms of electromagnetic propagation.